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7985 lines
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HTML
7985 lines
121 KiB
HTML
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<meta name="title" content="Citadel health checking">
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<meta name="description" content="Shows how to enable Citadel health checking with Kubernetes.">
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<meta name="og:title" content="Citadel health checking">
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<meta name="og:description" content="Shows how to enable Citadel health checking with Kubernetes.">
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<title>Istioldie 0.8 / Citadel health checking</title>
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<h6 class="dropdown-header">Other versions of this site</h6>
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<a href="https://istio.io" class="dropdown-item">Current Release</a>
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<div class="card">
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<div class="card-header" role="tab" id="header7">
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<a data-toggle="collapse" href="#collapse7" title="Concepts help you learn about the different parts of the Istio system and the abstractions it uses." role="button" aria-controls="collapse7">
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Concepts
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</a>
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<ul class="tree">
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="A broad overview of the Istio system." href="/v0.8/docs/concepts/what-is-istio/">What is Istio? </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="Provides a conceptual introduction to Istio, including the problems it solves and its high-level architecture." href="/v0.8/docs/concepts/what-is-istio/overview/">Overview</a>
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</li>
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<li>
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<a title="Describes the core principles that Istio's design adheres to." href="/v0.8/docs/concepts/what-is-istio/goals/">Design Goals</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Describes the various Istio features focused on traffic routing and control." href="/v0.8/docs/concepts/traffic-management/">Traffic Management </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="Provides a conceptual overview of traffic management in Istio and the features it enables." href="/v0.8/docs/concepts/traffic-management/overview/">Overview</a>
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</li>
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<li>
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<a title="Introduces Pilot, the component responsible for managing a distributed deployment of Envoy proxies in the service mesh." href="/v0.8/docs/concepts/traffic-management/pilot/">Pilot</a>
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</li>
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<li>
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<a title="Describes how requests are routed between services in an Istio service mesh." href="/v0.8/docs/concepts/traffic-management/request-routing/">Request Routing</a>
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</li>
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<li>
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<a title="Describes how traffic is load balanced across instances of a service in the mesh." href="/v0.8/docs/concepts/traffic-management/load-balancing/">Discovery & Load Balancing</a>
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</li>
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<li>
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<a title="An overview of failure recovery capabilities in Envoy that can be leveraged by unmodified applications to improve robustness and prevent cascading failures." href="/v0.8/docs/concepts/traffic-management/handling-failures/">Handling Failures</a>
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</li>
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<li>
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<a title="Introduces the idea of systematic fault injection that can be used to uncover conflicting failure recovery policies across services." href="/v0.8/docs/concepts/traffic-management/fault-injection/">Fault Injection</a>
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</li>
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<li>
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<a title="Provides a high-level overview of the configuration model used by Istio to configure traffic management rules in the service mesh." href="/v0.8/docs/concepts/traffic-management/rules-configuration/">Rules Configuration</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Describes Istio's authorization and authentication functionality." href="/v0.8/docs/concepts/security/">Security </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="Describes Istio's authentication policy" href="/v0.8/docs/concepts/security/authn-policy/">Authentication Policy</a>
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</li>
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<li>
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<a title="Describes Istio's mutual TLS authentication architecture which provides a strong service identity and secure communication channels between services." href="/v0.8/docs/concepts/security/mutual-tls/">Mutual TLS Authentication</a>
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</li>
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<li>
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<a title="Describes Istio RBAC which provides access control for services in Istio Mesh." href="/v0.8/docs/concepts/security/rbac/">Istio Role-Based Access Control (RBAC)</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
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<label class='tree-toggle'>
|
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|
|
<i class='fa fa-lg fa-caret-right'></i>
|
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<a title="Introduces the policy control snd telemetry collection mechanisms." href="/v0.8/docs/concepts/policies-and-telemetry/">Policies and Telemetry </a>
|
|
</label>
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<ul class="tree collapse">
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<li>
|
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<a title="Describes the design of the policy and telemetry mechanisms." href="/v0.8/docs/concepts/policies-and-telemetry/overview/">Overview</a>
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</li>
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<li>
|
|
|
|
<a title="An overview of the key concepts used to configure Istio's policy enforcement and telemetry collection features." href="/v0.8/docs/concepts/policies-and-telemetry/config/">Configuration</a>
|
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</li>
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</ul>
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</li>
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</ul>
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</div>
|
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</div>
|
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</div>
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<div class="card">
|
|
<div class="card-header" role="tab" id="header22">
|
|
<a data-toggle="collapse" href="#collapse22" title="Setup contains instructions for installing the Istio control plane in various environments (e.g., Kubernetes, Consul, etc.), as well as instructions for installing the sidecar in the application deployment." role="button" aria-controls="collapse22">
|
|
<div>
|
|
Setup
|
|
</div>
|
|
</a>
|
|
</div>
|
|
|
|
<div id="collapse22" class="collapse" data-parent="#sidebar" role="tabpanel" aria-labelledby="header22">
|
|
<div class="card-body">
|
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<ul class="tree">
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<li class="sublist">
|
|
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|
|
<label class='tree-toggle'>
|
|
|
|
<i class='fa fa-lg fa-caret-right'></i>
|
|
|
|
<a title="Instructions for installing the Istio control plane on Kubernetes and adding VMs into the mesh." href="/v0.8/docs/setup/kubernetes/">Kubernetes </a>
|
|
</label>
|
|
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<ul class="tree collapse">
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<li>
|
|
|
|
<a title="Quick start instructions to setup the Istio service mesh in a Kubernetes cluster." href="/v0.8/docs/setup/kubernetes/quick-start/">Quick Start</a>
|
|
|
|
</li>
|
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|
<li>
|
|
|
|
<a title="Quick Start instructions to setup the Istio service using Google Kubernetes Engine (GKE)" href="/v0.8/docs/setup/kubernetes/quick-start-gke-dm/">Quick Start with Google Kubernetes Engine</a>
|
|
|
|
</li>
|
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|
|
<li>
|
|
|
|
<a title="Install Istio with the included Helm chart." href="/v0.8/docs/setup/kubernetes/helm-install/">Installation with Helm</a>
|
|
|
|
</li>
|
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<li>
|
|
|
|
<a title="Install Istio with the included Ansible playbook." href="/v0.8/docs/setup/kubernetes/ansible-install/">Installation with Ansible</a>
|
|
|
|
</li>
|
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<li>
|
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|
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<a title="Instructions for installing the Istio sidecar in application pods automatically using the sidecar injector webhook or manually using istioctl CLI." href="/v0.8/docs/setup/kubernetes/sidecar-injection/">Installing the Istio Sidecar</a>
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</li>
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<li>
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<a title="Instructions for integrating VMs and bare metal hosts into an Istio mesh deployed on Kubernetes." href="/v0.8/docs/setup/kubernetes/mesh-expansion/">Mesh Expansion</a>
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</li>
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<li>
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<a title="Install Istio with multicluster support." href="/v0.8/docs/setup/kubernetes/multicluster-install/">Istio Multicluster</a>
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</li>
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<li>
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<a title="This guide demonstrates how to upgrade the Istio control plane and data plane independently." href="/v0.8/docs/setup/kubernetes/upgrading-istio/">Upgrading Istio</a>
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</li>
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</ul>
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Instructions for installing the Istio control plane in a Consul based environment, with or without Nomad." href="/v0.8/docs/setup/consul/">Nomad & Consul </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="Quick Start instructions to setup the Istio service mesh with Docker Compose." href="/v0.8/docs/setup/consul/quick-start/">Quick Start on Docker</a>
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</li>
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<li>
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|
<a title="Instructions for installing the Istio control plane in a Consul based environment, with or without Nomad." href="/v0.8/docs/setup/consul/install/">Installation</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
|
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<label class='tree-toggle'>
|
|
|
|
<i class='fa fa-lg fa-caret-right'></i>
|
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|
|
<a title="Instructions for installing the Istio control plane in a Eureka based environment." href="/v0.8/docs/setup/eureka/">Eureka </a>
|
|
</label>
|
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<ul class="tree collapse">
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<li>
|
|
|
|
<a title="Quick Start instructions to setup the Istio service mesh with Docker Compose." href="/v0.8/docs/setup/eureka/quick-start/">Quick Start on Docker</a>
|
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</li>
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<li>
|
|
|
|
<a title="Instructions for installing the Istio control plane in an Eureka based environment." href="/v0.8/docs/setup/eureka/install/">Installation</a>
|
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|
|
</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</div>
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|
<div class="card">
|
|
<div class="card-header" role="tab" id="header37">
|
|
<a data-toggle="collapse" href="#collapse37" title="Tasks show you how to do a single specific targeted activity with the Istio system." role="button" aria-controls="collapse37">
|
|
<div>
|
|
Tasks
|
|
</div>
|
|
</a>
|
|
</div>
|
|
|
|
<div id="collapse37" class="collapse show" data-parent="#sidebar" role="tabpanel" aria-labelledby="header37">
|
|
<div class="card-body">
|
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<ul class="tree">
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<li class="sublist">
|
|
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|
|
|
<label class='tree-toggle'>
|
|
|
|
<i class='fa fa-lg fa-caret-right'></i>
|
|
|
|
<a title="Describes tasks that demonstrate traffic routing features of Istio service mesh." href="/v0.8/docs/tasks/traffic-management/">Traffic Management </a>
|
|
</label>
|
|
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<ul class="tree collapse">
|
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|
|
<li>
|
|
|
|
<a title="This task shows you how to configure dynamic request routing based on weights and HTTP headers." href="/v0.8/docs/tasks/traffic-management/request-routing/">Configuring Request Routing</a>
|
|
|
|
</li>
|
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|
<li>
|
|
|
|
<a title="This task shows how to inject delays and test the resiliency of your application." href="/v0.8/docs/tasks/traffic-management/fault-injection/">Fault Injection</a>
|
|
|
|
</li>
|
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<li>
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<a title="Shows you how to migrate traffic from an old to new version of a service." href="/v0.8/docs/tasks/traffic-management/traffic-shifting/">Traffic Shifting</a>
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</li>
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<li>
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<a title="This task shows you how to setup request timeouts in Envoy using Istio." href="/v0.8/docs/tasks/traffic-management/request-timeouts/">Setting Request Timeouts</a>
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</li>
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<li>
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<a title="Describes how to configure Istio to expose a service outside of the service mesh." href="/v0.8/docs/tasks/traffic-management/ingress/">Control Ingress Traffic</a>
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</li>
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<li>
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<a title="Describes how to configure Istio to expose a service outside of the service mesh, over TLS or Mutual TLS." href="/v0.8/docs/tasks/traffic-management/secure-ingress/">Securing Gateways with HTTPS</a>
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</li>
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<li>
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<a title="Describes how to configure Istio to route traffic from services in the mesh to external services." href="/v0.8/docs/tasks/traffic-management/egress/">Control Egress Traffic</a>
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</li>
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<li>
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<a title="Describes how to configure Istio to perform TLS origination for traffic to external services" href="/v0.8/docs/tasks/traffic-management/egress-tls-origination/">TLS Origination for Egress Traffic</a>
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</li>
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<li>
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<a title="Describes how to configure Istio to direct traffic to external services through a dedicated gateway service" href="/v0.8/docs/tasks/traffic-management/egress-gateway/">Configure an Egress Gateway</a>
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</li>
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<li>
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<a title="This task demonstrates the circuit-breaking capability for resilient applications" href="/v0.8/docs/tasks/traffic-management/circuit-breaking/">Circuit Breaking</a>
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</li>
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<li>
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<a title="This task demonstrates the traffic shadowing/mirroring capabilities of Istio" href="/v0.8/docs/tasks/traffic-management/mirroring/">Mirroring</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-down'></i>
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<a title="Demonstrates how to secure the mesh." href="/v0.8/docs/tasks/security/">Security </a>
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</label>
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<ul class="tree">
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<li>
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<a title="Shows you how to use Istio authentication policy to setup mutual TLS and basic end-user authentication." href="/v0.8/docs/tasks/security/authn-policy/">Basic Authentication Policy</a>
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</li>
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<li>
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<a title="Shows you how to verify and test Istio's automatic mutual TLS authentication." href="/v0.8/docs/tasks/security/mutual-tls/">Testing Mutual TLS</a>
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</li>
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<li>
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<a title="Shows how to control access to a service using the Kubernetes labels." href="/v0.8/docs/tasks/security/basic-access-control/">Basic Access Control</a>
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</li>
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<li>
|
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|
<a title="Shows how to securely control access to a service using service accounts." href="/v0.8/docs/tasks/security/secure-access-control/">Secure Access Control</a>
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</li>
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<li>
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|
<a title="Shows how to set up role-based access control for services in Istio mesh." href="/v0.8/docs/tasks/security/role-based-access-control/">Role-Based Access Control</a>
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</li>
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<li>
|
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|
<a title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key." href="/v0.8/docs/tasks/security/plugin-ca-cert/">Plugging in external CA key and certificate</a>
|
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</li>
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<li>
|
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|
<span class="current" title="Shows how to enable Citadel health checking with Kubernetes.">Citadel health checking</span>
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</li>
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<li>
|
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|
|
<a title="Shows how to enable mutual TLS on HTTPS services." href="/v0.8/docs/tasks/security/https-overlay/">Mutual TLS over HTTPS</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
|
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|
<label class='tree-toggle'>
|
|
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|
<i class='fa fa-lg fa-caret-right'></i>
|
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|
<a title="Demonstrates policy enforcement features." href="/v0.8/docs/tasks/policy-enforcement/">Policies </a>
|
|
</label>
|
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|
<ul class="tree collapse">
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<li>
|
|
|
|
<a title="This task shows you how to use Istio to dynamically limit the traffic to a service." href="/v0.8/docs/tasks/policy-enforcement/rate-limiting/">Enabling Rate Limits</a>
|
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</li>
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</ul>
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</li>
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<li class="sublist">
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|
|
<label class='tree-toggle'>
|
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|
|
<i class='fa fa-lg fa-caret-right'></i>
|
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|
|
<a title="Demonstrates how to collect telemetry information from the mesh." href="/v0.8/docs/tasks/telemetry/">Telemetry </a>
|
|
</label>
|
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|
<ul class="tree collapse">
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<li>
|
|
|
|
<a title="How to configure the proxies to send tracing requests to Zipkin or Jaeger" href="/v0.8/docs/tasks/telemetry/distributed-tracing/">Distributed Tracing</a>
|
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</li>
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<li>
|
|
|
|
<a title="This task shows you how to configure Istio to collect metrics and logs." href="/v0.8/docs/tasks/telemetry/metrics-logs/">Collecting Metrics and Logs</a>
|
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|
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</li>
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<li>
|
|
|
|
<a title="This task shows you how to configure Istio to collect metrics for TCP services." href="/v0.8/docs/tasks/telemetry/tcp-metrics/">Collecting Metrics for TCP services</a>
|
|
|
|
</li>
|
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<li>
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<a title="This task shows you how to query for Istio Metrics using Prometheus." href="/v0.8/docs/tasks/telemetry/querying-metrics/">Querying Metrics from Prometheus</a>
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</li>
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<li>
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<a title="This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic." href="/v0.8/docs/tasks/telemetry/using-istio-dashboard/">Visualizing Metrics with Grafana</a>
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</li>
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<li>
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<a title="This task shows you how to generate a graph of services within an Istio mesh." href="/v0.8/docs/tasks/telemetry/servicegraph/">Generating a Service Graph</a>
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</li>
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<li>
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<a title="This task shows you how to configure Istio to log to a Fluentd daemon" href="/v0.8/docs/tasks/telemetry/fluentd/">Logging with Fluentd</a>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="card">
|
|
<div class="card-header" role="tab" id="header48">
|
|
<a data-toggle="collapse" href="#collapse48" title="Guides include a variety of fully working example uses for Istio that you can experiment with." role="button" aria-controls="collapse48">
|
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<div>
|
|
Guides
|
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</div>
|
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</a>
|
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</div>
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<div id="collapse48" class="collapse" data-parent="#sidebar" role="tabpanel" aria-labelledby="header48">
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<div class="card-body">
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<ul class="tree">
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<li>
|
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|
<a title="This guide deploys a sample application composed of four separate microservices which will be used to demonstrate various features of the Istio service mesh." href="/v0.8/docs/guides/bookinfo/">Bookinfo Sample Application</a>
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</li>
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<li>
|
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|
<a title="This guide demonstrates how to use various traffic management capabilities of an Istio service mesh." href="/v0.8/docs/guides/intelligent-routing/">Intelligent Routing</a>
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</li>
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<li>
|
|
|
|
<a title="This sample demonstrates how to obtain uniform metrics, logs, traces across different services using Istio Mixer and Istio sidecar." href="/v0.8/docs/guides/telemetry/">In-Depth Telemetry</a>
|
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</li>
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<li>
|
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|
|
<a title="Explains how to manually integrate Google Cloud Endpoints services with Istio." href="/v0.8/docs/guides/endpoints/">Install Istio for Google Cloud Endpoints Services</a>
|
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</li>
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<li>
|
|
|
|
<a title="This sample deploys the Bookinfo services across Kubernetes and a set of virtual machines, and illustrates how to use the Istio service mesh to control this infrastructure as a single mesh." href="/v0.8/docs/guides/integrating-vms/">Integrating Virtual Machines</a>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="card">
|
|
<div class="card-header" role="tab" id="header77">
|
|
<a data-toggle="collapse" href="#collapse77" title="Introduces Performance and Scalability methodology, results and best practices for Istio components." role="button" aria-controls="collapse77">
|
|
<div>
|
|
Performance and Scalability
|
|
</div>
|
|
</a>
|
|
</div>
|
|
|
|
<div id="collapse77" class="collapse" data-parent="#sidebar" role="tabpanel" aria-labelledby="header77">
|
|
<div class="card-body">
|
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<ul class="tree">
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<li>
|
|
|
|
<a title="Provides a conceptual introduction to Istio's Performance and Scalability" href="/v0.8/docs/performance-and-scalability/overview/">Overview</a>
|
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</li>
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<li>
|
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|
|
<a title="Performance measurement through code level micro-benchmarks." href="/v0.8/docs/performance-and-scalability/microbenchmarks/">Micro Benchmarks</a>
|
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</li>
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<li>
|
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|
|
<a title="The different scenarios we are tracking for performance and scalability." href="/v0.8/docs/performance-and-scalability/scenarios/">Testing scenarios</a>
|
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</li>
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<li>
|
|
|
|
<a title="Fortio is our simple synthetic http and grpc benchmarking tool." href="/v0.8/docs/performance-and-scalability/synthetic-benchmarks/">Synthetic End to End benchmarks</a>
|
|
|
|
</li>
|
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<li>
|
|
|
|
<a title="Performance measurement through realistic micro service application tests." href="/v0.8/docs/performance-and-scalability/realistic-app-benchmark/">Realistic Application Benchmark</a>
|
|
|
|
</li>
|
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<li>
|
|
|
|
<a title="How we ensure performance is tracked and improves or does not regress across releases." href="/v0.8/docs/performance-and-scalability/performance-testing-automation/">Automation</a>
|
|
|
|
</li>
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<li>
|
|
|
|
<a title="Setup of Istio components to scale horizontally. High availability. Sizing guide." href="/v0.8/docs/performance-and-scalability/scalability/">Scalability and Sizing Guide</a>
|
|
|
|
</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="card">
|
|
<div class="card-header" role="tab" id="header85">
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<a data-toggle="collapse" href="#collapse85" title="The Reference section contains detailed authoritative reference material such as command-line options, configuration options, and API calling parameters." role="button" aria-controls="collapse85">
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<div>
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Reference
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</a>
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<div id="collapse85" class="collapse" data-parent="#sidebar" role="tabpanel" aria-labelledby="header85">
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Detailed information on configuration options." href="/v0.8/docs/reference/config/">Configuration </a>
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Describes how to configure Istio's policy and telemetry features." href="/v0.8/docs/reference/config/policy-and-telemetry/">Policies and Telemetry </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="Describes the base attribute vocabulary used for policy and control." href="/v0.8/docs/reference/config/policy-and-telemetry/attribute-vocabulary/">Attribute Vocabulary</a>
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<li>
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<a title="Mixer config expression language reference." href="/v0.8/docs/reference/config/policy-and-telemetry/expression-language/">Expression Language</a>
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Mixer adapters allow Istio to interface to a variety of infrastructure backends for such things as metrics and logs." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/">Adapters </a>
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</label>
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<li>
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<a title="Adapter for circonus.com's monitoring solution." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/circonus/">Circonus</a>
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</li>
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<li>
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<a title="Adapter for cloudwatch metrics." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/cloudwatch/">CloudWatch</a>
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</li>
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<li>
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<a title="Adapter to deliver metrics to a dogstatsd agent for delivery to DataDog" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/datadog/">Datadog</a>
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</li>
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<li>
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<a title="Adapter that always returns a precondition denial." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/denier/">Denier</a>
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</li>
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<li>
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<a title="Adapter that delivers logs to a fluentd daemon." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/fluentd/">Fluentd</a>
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</li>
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<li>
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<a title="Adapter that extracts information from a Kubernetes environment." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/kubernetesenv/">Kubernetes Env</a>
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</li>
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<li>
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<a title="Adapter that performs whitelist or blacklist checks" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/list/">List</a>
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</li>
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<li>
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<a title="Adapter for a simple in-memory quota management system." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/memquota/">Memory quota</a>
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</li>
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<li>
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<a title="Adapter that implements an Open Policy Agent engine" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/opa/">OPA</a>
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</li>
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<li>
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<a title="Adapter that exposes Istio metrics for ingestion by a Prometheus harvester." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/prometheus/">Prometheus</a>
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</li>
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<li>
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<a title="Adapter that exposes Istio's Role-Based Access Control model." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/rbac/">RBAC</a>
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</li>
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<li>
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<a title="Adapter for a Redis-based quota management system." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/redisquota/">Redis Quota</a>
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</li>
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<li>
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<a title="Adapter that delivers logs and metrics to Google Service Control" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/servicecontrol/">Service Control</a>
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</li>
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<li>
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<a title="Adapter to deliver logs and metrics to Papertrail and AppOptics backends" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/solarwinds/">SolarWinds</a>
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</li>
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<li>
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<a title="Adapter to deliver logs and metrics to Stackdriver" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/stackdriver/">Stackdriver</a>
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</li>
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<li>
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<a title="Adapter to deliver metrics to a StatsD backend" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/statsd/">StatsD</a>
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</li>
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<li>
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<a title="Adapter for outputting logs and metrics locally." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/stdio/">Stdio</a>
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</li>
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</ul>
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</li>
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<li>
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<a title="Default Metrics exported from Istio through Mixer." href="/v0.8/docs/reference/config/policy-and-telemetry/metrics/">Default Metrics</a>
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</li>
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<li class="sublist">
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<label class='tree-toggle'>
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<i class='fa fa-lg fa-caret-right'></i>
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<a title="Mixer templates are used to send data to individual adapters." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/">Templates </a>
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</label>
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<ul class="tree collapse">
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<li>
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<a title="A template that represents a single API key." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/apikey/">API Key</a>
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</li>
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<li>
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<a title="A template used to represent an access control query." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/authorization/">Authorization</a>
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</li>
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<li>
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<a title="A template that carries no data, useful for testing." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/checknothing/">Check Nothing</a>
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</li>
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<li>
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<a title="A template that is used to control the production of Kubernetes-specific attributes." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/kubernetes/">Kubernetes</a>
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</li>
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<li>
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<a title="A template designed to let you perform list checking operations." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/listentry/">List Entry</a>
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</li>
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<li>
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<a title="A template that represents a single runtime log entry." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/logentry/">Log Entry</a>
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</li>
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<li>
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<a title="A template that represents a single runtime metric." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/metric/">Metric</a>
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</li>
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<li>
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<a title="A template that represents a quota allocation request" href="/v0.8/docs/reference/config/policy-and-telemetry/templates/quota/">Quota</a>
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</li>
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<li>
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<a title="A template that carries no data, useful for testing." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/reportnothing/">Report Nothing</a>
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</li>
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<li>
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<a title="A template used by the Google Service Control adapter." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/servicecontrolreport/">Service Control Report</a>
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</li>
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</ul>
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</li>
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<li>
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|
<a title="Describes the rules used to configure Mixer's policy and telemetry features." href="/v0.8/docs/reference/config/policy-and-telemetry/istio.policy.v1beta1/">Rules</a>
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</li>
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</ul>
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</li>
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<li>
|
|
|
|
<a title="Configuration for Role Based Access Control" href="/v0.8/docs/reference/config/istio.rbac.v1alpha1/">RBAC</a>
|
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</li>
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<li>
|
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|
|
<a title="Configuration affecting traffic routing" href="/v0.8/docs/reference/config/istio.routing.v1alpha1/">Route Rules v1alpha1 (deprecated)</a>
|
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|
</li>
|
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<li>
|
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|
|
<a title="Configuration affecting traffic routing" href="/v0.8/docs/reference/config/istio.networking.v1alpha3/">Route Rules v1alpha3</a>
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</li>
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</ul>
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</li>
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<li class="sublist">
|
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|
|
<label class='tree-toggle'>
|
|
|
|
<i class='fa fa-lg fa-caret-right'></i>
|
|
|
|
<a title="Describes usage and options of the Istio commands and utilities." href="/v0.8/docs/reference/commands/">Commands </a>
|
|
</label>
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<ul class="tree collapse">
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|
|
<li>
|
|
|
|
<a title="Istio Certificate Authority (CA)" href="/v0.8/docs/reference/commands/istio_ca/">istio_ca</a>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
<a title="Istio control interface" href="/v0.8/docs/reference/commands/istioctl/">istioctl</a>
|
|
|
|
</li>
|
|
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|
|
<li>
|
|
|
|
<a title="Utility to trigger direct calls to Mixer&#39;s API." href="/v0.8/docs/reference/commands/mixc/">mixc</a>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
<a title="Mixer is Istio&#39;s abstraction on top of infrastructure backends." href="/v0.8/docs/reference/commands/mixs/">mixs</a>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
<a title="Istio security per-node agent" href="/v0.8/docs/reference/commands/node_agent/">node_agent</a>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
<a title="Istio Pilot agent" href="/v0.8/docs/reference/commands/pilot-agent/">pilot-agent</a>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
<a title="Istio Pilot" href="/v0.8/docs/reference/commands/pilot-discovery/">pilot-discovery</a>
|
|
|
|
</li>
|
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|
|
<li>
|
|
|
|
<a title="Kubernetes webhook for automatic Istio sidecar injection" href="/v0.8/docs/reference/commands/sidecar-injector/">sidecar-injector</a>
|
|
|
|
</li>
|
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</ul>
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</li>
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</ul>
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</div>
|
|
</div>
|
|
</div>
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</div>
|
|
</nav>
|
|
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|
|
</div>
|
|
|
|
|
|
<div class="col-12 col-md-9 col-xl-8">
|
|
|
|
|
|
<p class="d-md-none">
|
|
<label class="sidebar-toggler" data-toggle="offcanvas">
|
|
<i class="fa fa-sign-out-alt"></i>
|
|
</label>
|
|
</p>
|
|
|
|
<main aria-labelledby="title">
|
|
<h1 id="title">Citadel health checking</h1>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<nav class="toc-inlined d-xl-none d-print-none" >
|
|
<div class="directory" role="directory">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<nav id="InlinedTableOfContents">
|
|
<ul>
|
|
<li><a href="#before-you-begin">Before you begin</a></li>
|
|
<li><a href="#deploying-citadel-with-health-checking">Deploying Citadel with health checking</a></li>
|
|
<li><a href="#verifying-the-health-checker-is-working">Verifying the health checker is working</a></li>
|
|
<li><a href="#optional-configuring-the-health-checking">(Optional) Configuring the health checking</a></li>
|
|
<li><a href="#cleanup">Cleanup</a></li>
|
|
<li><a href="#whats-next">What's next</a></li>
|
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</ul>
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</nav>
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</div>
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</nav>
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<p>This task shows how to enable Kubernetes health checking for Citadel. Note this is an Alpha feature.</p>
|
|
<p>Since Istio 0.6, Citadel has a health checking feature that can be optionally enabled.
|
|
By default, the normal Istio deployment process does not enable this feature.
|
|
Currently, the health checking feature is able to detect the failures of Citadel CSR signing service,
|
|
by periodically sending CSRs to the API. More health checking features are coming shortly.</p>
|
|
<p>Citadel contains a <em>prober client</em> module that periodically checks Citadel's status (currently only the health
|
|
status of the gRPC server).
|
|
If Citadel is healthy, the <em>prober client</em> updates the <em>modification time</em> of the <em>health status file</em>
|
|
(the file is always empty). Otherwise, it does nothing. Citadel relies on a
|
|
<a href="https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/">K8s liveness and readiness probe</a>
|
|
with command line to check the <em>modification time</em> of the <em>health status file</em> on the pod.
|
|
If the file is not updated for a period, the probe will be triggered and Kubelet will restart the Citadel container.</p>
|
|
<p>Note: because Citadel health checking currently only monitors the health status of CSR service API,
|
|
this feature is not needed if the production setup is not using the
|
|
<a href="/v0.8/docs/setup/kubernetes/mesh-expansion/">Istio Mesh Expansion</a> (which requires the CSR service API).</p>
|
|
<h2 id="before-you-begin">Before you begin</h2>
|
|
<ul>
|
|
<li>
|
|
<p>Set up Istio by following the instructions in the
|
|
<a href="/v0.8/docs/setup/kubernetes/quick-start/">quick start</a> with global mutual TLS enabled:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl apply -f install/kubernetes/istio-demo-auth.yaml
|
|
</code></pre><p><em><strong>OR</strong></em>
|
|
Using <a href="/v0.8/docs/setup/kubernetes/helm-install/">Helm</a> with <code>global.mtls.enabled</code> to <code>true</code>.</p>
|
|
</li>
|
|
</ul>
|
|
<blockquote>
|
|
<p>Starting with Istio 0.7, you can use <a href="/v0.8/docs/concepts/security/authn-policy/">authentication policy</a> to configure mutual TLS for all/selected services in a namespace (repeated for all namespaces to get global setting). See <a href="/v0.8/docs/tasks/security/authn-policy/">authentication policy task</a></p>
|
|
</blockquote>
|
|
<h2 id="deploying-citadel-with-health-checking">Deploying Citadel with health checking</h2>
|
|
<p>Deploy Citadel with health checking enabled.</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl apply -f @install/kubernetes/istio-citadel-with-health-check.yaml@
|
|
</code></pre><p>Deploy the <code>istio-citadel</code> service so that the CSR service can be found by the health checker.</p>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">cat <span style="color:#e6db74"><<EOF | kubectl create -f -
|
|
</span><span style="color:#e6db74">apiVersion: v1
|
|
</span><span style="color:#e6db74">kind: Service
|
|
</span><span style="color:#e6db74">metadata:
|
|
</span><span style="color:#e6db74"> name: istio-citadel
|
|
</span><span style="color:#e6db74"> namespace: istio-system
|
|
</span><span style="color:#e6db74"> labels:
|
|
</span><span style="color:#e6db74"> istio: citadel
|
|
</span><span style="color:#e6db74">spec:
|
|
</span><span style="color:#e6db74"> ports:
|
|
</span><span style="color:#e6db74"> - port: 8060
|
|
</span><span style="color:#e6db74"> selector:
|
|
</span><span style="color:#e6db74"> istio: citadel
|
|
</span><span style="color:#e6db74">EOF</span>
|
|
</code></pre></div><h2 id="verifying-the-health-checker-is-working">Verifying the health checker is working</h2>
|
|
<p>Citadel will log the health checking results. Run the following in command line:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl logs `kubectl get po -n istio-system | grep istio-citadel | awk '{print $1}'` -n istio-system
|
|
</code></pre><p>You will see the output similar to:</p>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-plain" data-lang="plain">...
|
|
2018-02-27T04:29:56.128081Z info CSR successfully signed.
|
|
...
|
|
2018-02-27T04:30:11.081791Z info CSR successfully signed.
|
|
...
|
|
2018-02-27T04:30:25.485315Z info CSR successfully signed.
|
|
...
|
|
</code></pre></div><p>The log above indicates the periodic health checking is working.
|
|
Observe that the health checking interval is about 15 seconds, which is the default health checking interval.</p>
|
|
<h2 id="optional-configuring-the-health-checking">(Optional) Configuring the health checking</h2>
|
|
<p>Optionally, adjust the health checking configuration to meet your own needs. Open the file
|
|
<code>install/kubernetes/istio-citadel-with-health-check.yaml</code>, and locate the following lines.</p>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-plain" data-lang="plain">...
|
|
- --liveness-probe-path=/tmp/ca.liveness # path to the liveness health checking status file
|
|
- --liveness-probe-interval=60s # interval for health checking file update
|
|
- --probe-check-interval=15s # interval for health status check
|
|
- --logtostderr
|
|
- --stderrthreshold
|
|
- INFO
|
|
livenessProbe:
|
|
exec:
|
|
command:
|
|
- /usr/local/bin/istio_ca
|
|
- probe
|
|
- --probe-path=/tmp/ca.liveness # path to the liveness health checking status file
|
|
- --interval=125s # the maximum time gap allowed between the file mtime and the current sys clock.
|
|
initialDelaySeconds: 60
|
|
periodSeconds: 60
|
|
...
|
|
</code></pre></div><p>The <code>liveness-probe-path</code> and <code>probe-path</code> are the path to the health status file, configured at Citadel and the
|
|
prober;
|
|
the <code>liveness-probe-interval</code> is the interval to update the health status file, if Citadel is healthy;
|
|
the <code>probe-check-interval</code> is the interval for Citadel health checking.
|
|
The <code>interval</code> is the maximum time elapsed since the last update of the health status file, for the prober to consider
|
|
Citadel as healthy.
|
|
<code>initialDelaySeconds</code> and <code>periodSeconds</code> are the initial delay and the probe running period.</p>
|
|
<p>Prolonging <code>probe-check-interval</code> will reduce the health checking overhead, but there will be a greater lagging for the
|
|
prober to get notified on the unhealthy status.
|
|
To avoid the prober restarting Citadel due to temporary unavailability, the <code>interval</code> on the prober can be
|
|
configured to be more than <code>N</code> times of the <code>liveness-probe-interval</code>. This will allow the prober to tolerate <code>N-1</code>
|
|
continuously failed health checks.</p>
|
|
<h2 id="cleanup">Cleanup</h2>
|
|
<ul>
|
|
<li>
|
|
<p>To disable health checking on Citadel:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl apply -f @install/kubernetes/istio-auth.yaml@
|
|
$ kubectl delete svc istio-citadel -n istio-system
|
|
</code></pre></li>
|
|
<li>
|
|
<p>To remove Citadel:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl delete -f @install/kubernetes/istio-citadel-with-health-check.yaml@
|
|
$ kubectl delete svc istio-citadel -n istio-system
|
|
</code></pre></li>
|
|
</ul>
|
|
<h2 id="whats-next">What's next</h2>
|
|
<ul>
|
|
<li>Read more about <a href="/v0.8/docs/reference/commands/istio_ca/">Citadel (codename is istio_ca) arguments</a>.</li>
|
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</ul>
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</main>
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<a title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key." href="/v0.8/docs/tasks/security/plugin-ca-cert/"><i class="fa fa-arrow-left"></i> Plugging in external CA key and certificate</a>
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<li><a href="#before-you-begin">Before you begin</a></li>
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<li><a href="#deploying-citadel-with-health-checking">Deploying Citadel with health checking</a></li>
|
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<li><a href="#verifying-the-health-checker-is-working">Verifying the health checker is working</a></li>
|
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<li><a href="#optional-configuring-the-health-checking">(Optional) Configuring the health checking</a></li>
|
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<li><a href="#cleanup">Cleanup</a></li>
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<li><a href="#whats-next">What's next</a></li>
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</a>
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</div>
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<div class="icon">
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<span>github</span>
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<a title="GitHub is where development takes place on Istio code"
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href="https://github.com/istio/community" aria-label="GitHub">
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<svg viewBox="0 0 478.165 478.165">
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c24.426,20.999,33.073,71.904,21.079,113.704c35.006,2.73,76.666-1.235,103.642,9.484c-25.183-3.248-59.651-9.563-91.987-7.431
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c-6.136,0.458-15.361-0.239-14.903,8.408c37.735,3.008,75.092,6.117,105.894,15.779c-30.702-4.981-67.74-12.552-105.894-13.668
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c-15.54,30.921-47.239,46.262-90.991,49.49c4.682,10.261,13.847,14.066,15.879,30.702c3.267,24.406-4.881,60.328,3.208,76.686
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c4.064,7.89,10.579,8.009,14.863,14.604c-10.699,12.871-37.257-1.395-40.186-14.604c-5.14-22.852,7.89-58.256-6.415-73.737
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c0.996,24.865-5.718,59.85,0.996,82.145c2.789,8.806,10.659,12.113,8.647,20.063c-49.809,5.08-28.989-64.373-37.177-105.356
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c-7.471,0.697-4.204,11.197-4.224,15.76c-0.199,40.106,8.189,94.836-34.846,89.556c-1.315-8.348,5.838-11.217,8.467-19.007
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c7.91-22.434-1.454-56.045,2.112-83.161c-16.417,12.512,1.793,55.666-8.428,77.961c-5.838,12.671-24.785,18.27-39.19,12.651
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c1.873-9.464,11.695-7.989,15.879-16.875c5.818-12.452,0.02-30.244,2.092-48.494c-30.423,6.097-53.993-0.877-65.608-20.023
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c-5.12-8.507-6.356-18.708-12.632-26.219c-6.117-7.551-16.098-8.507-19.087-18.808c37.755-9.185,39.17,38.771,73.06,39.807
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c10.44,0.418,15.799-2.909,25.402-5.16c2.749-12.113,8.428-21.039,16.875-27.494c-42.078-5.658-76.865-18.788-93.023-50.466
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c-38.293,1.893-73.339,7.013-105.894,14.843c29.547-10.679,65.807-14.604,104.778-15.819c-2.351-13.807-22.434-10.022-34.866-9.543
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C47.677,227.17,18.449,230.138,0,233.645c26.817-9.543,64.233-8.348,100.454-8.428c-11.038-34.767-7.232-90.014,17.015-110.615
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c-6.854-17.254-4.722-45.346,4.184-58.834c27.036,1.175,43.374,12.891,60.388,24.247c21.019-6.017,43.035-9.045,71.904-7.451
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c12.133,0.677,24.705,6.097,33.731,5.32c8.906-0.877,18.728-10.898,27.534-14.843C326.507,58.099,336.17,56.206,349.22,55.768z"/>
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</svg>
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</a>
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</div>
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<div class="icon">
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<span>drive</span>
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<a title="Access our team drive if you'd like to take a look at the Istio technical design documents"
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href="https://groups.google.com/forum/#!forum/istio-team-drive-access" aria-label="team drive">
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<path d="M69.866,15.557L0,138.919l28.732,52.552l143.288-0.029l35.008-59.588L136.39,15.735L69.866,15.557z M17.166,139.046
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<div class="icon">
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<span>working groups</span>
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<a title="If you'd like to contribute to the Istio project, consider participating in our working groups"
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<path d="M77.976,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
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<path d="M143.065,253.329l-36.77-14.658l-8.609-7.256c-2.275-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
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c-2.109-2.094-5.465-2.229-7.736-0.312l-8.611,7.256l-36.77,14.66C1.006,258.045,1.018,299.977,0,303.827h155.93
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C154.915,299.988,154.911,258.042,143.065,253.329z"/>
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<path d="M361.878,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
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c-23.854,0-37.057,12.362-36.812,36.182C325.411,209.124,339.274,228.915,361.878,228.568z"/>
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<path d="M426.968,253.329l-36.77-14.658l-8.609-7.256c-2.273-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
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c-2.109-2.094-5.465-2.229-7.736-0.312l-8.61,7.256l-36.771,14.66c-11.842,4.715-11.83,46.646-12.848,50.497h155.93
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C438.817,299.988,438.812,258.042,426.968,253.329z"/>
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</svg>
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</a>
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</div>
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<div class="icon">
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<span>slack</span>
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<a title="Interactively discuss development issues with the Istio community on Slack (invitation-only)"
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href="https://istio.slack.com" aria-label="slack">
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c1.388-0.622,2.01-2.25,1.389-3.637c-0.62-1.389-2.248-2.012-3.637-1.39l-1.324,0.593l-0.593-1.326
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c-0.621-1.388-2.249-2.009-3.637-1.388c-1.388,0.62-2.009,2.247-1.389,3.637l0.593,1.325L7.98,8.598L7.388,7.273
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c-0.621-1.39-2.249-2.009-3.637-1.39C2.363,6.504,1.742,8.132,2.362,9.52l0.592,1.324L1.63,11.438
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c-1.388,0.621-2.01,2.247-1.389,3.636c0.62,1.388,2.249,2.01,3.637,1.39l1.325-0.594l3.394,7.592l-1.325,0.592
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c-1.388,0.621-2.009,2.25-1.389,3.637c0.621,1.389,2.249,2.011,3.637,1.391l1.324-0.593l0.593,1.325
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c0.621,1.389,2.249,2.01,3.637,1.389c1.387-0.62,2.009-2.248,1.388-3.636l-0.591-1.326l7.591-3.394l0.592,1.321
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c0.621,1.391,2.248,2.013,3.637,1.392c1.388-0.619,2.01-2.248,1.389-3.637l-0.592-1.324l1.323-0.594
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C31.201,19.384,31.823,17.757,31.202,16.369z M13.623,21.215l-3.395-7.593l7.591-3.394l3.395,7.591L13.623,21.215z"/>
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for developers
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