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href=/v1.9/docs/setup/platform-setup/microk8s/>MicroK8s</a></li><li role=none><a role=treeitem title="Instructions to setup minikube for Istio." href=/v1.9/docs/setup/platform-setup/minikube/>Minikube</a></li><li role=none><a role=treeitem title="Instructions to setup an OpenShift cluster for Istio." href=/v1.9/docs/setup/platform-setup/openshift/>OpenShift</a></li><li role=none><a role=treeitem title="Instructions to setup an OKE cluster for Istio." href=/v1.9/docs/setup/platform-setup/oci/>Oracle Cloud Infrastructure</a></li></ul></li><li role=treeitem aria-label=Install><button aria-hidden=true></button><a title="Choose the guide that best suits your needs and platform." href=/v1.9/docs/setup/install/>Install</a><ul role=group aria-expanded=false><li role=none><a role=treeitem title="Install and customize any Istio configuration profile for in-depth evaluation or production use." href=/v1.9/docs/setup/install/istioctl/>Install with Istioctl</a></li><li role=none><a role=treeitem title="Instructions to install Istio in a Kubernetes cluster using the Istio operator." href=/v1.9/docs/setup/install/operator/>Istio Operator Install</a></li><li role=none><a role=treeitem title="Install and configure Istio for in-depth evaluation." href=/v1.9/docs/setup/install/helm/>Install with Helm</a></li><li role=treeitem aria-label="Install Multicluster"><button aria-hidden=true></button><a title="Install an Istio mesh across multiple Kubernetes clusters." href=/v1.9/docs/setup/install/multicluster/>Install Multicluster</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Initial steps before installing Istio on multiple clusters." href=/v1.9/docs/setup/install/multicluster/before-you-begin/>Before you begin</a></li><li role=none><a role=treeitem title="Install an Istio mesh across multiple primary clusters." href=/v1.9/docs/setup/install/multicluster/multi-primary/>Install Multi-Primary</a></li><li role=none><a role=treeitem title="Install an Istio mesh across primary and remote clusters." href=/v1.9/docs/setup/install/multicluster/primary-remote/>Install Primary-Remote</a></li><li role=none><a role=treeitem title="Install an Istio mesh across multiple primary clusters on different networks." href=/v1.9/docs/setup/install/multicluster/multi-primary_multi-network/>Install Multi-Primary on different networks</a></li><li role=none><a role=treeitem title="Install an Istio mesh across primary and remote clusters on different networks." href=/v1.9/docs/setup/install/multicluster/primary-remote_multi-network/>Install Primary-Remote on different networks</a></li><li role=none><a role=treeitem title="Verify that Istio has been installed properly on multiple clusters." href=/v1.9/docs/setup/install/multicluster/verify/>Verify the installation</a></li></ul></li><li role=none><a role=treeitem title="Deploy Istio and connect a workload running within a virtual machine to it." href=/v1.9/docs/setup/install/virtual-machine/>Virtual Machine Installation</a></li></ul></li><li role=treeitem aria-label=Upgrade><button aria-hidden=true></button><a title="Upgrade, downgrade, and manage Istio accross multiple control plane revisions." href=/v1.9/docs/setup/upgrade/>Upgrade</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Upgrade Istio by first running a canary deployment of a new control plane." href=/v1.9/docs/setup/upgrade/canary/>Canary Upgrades</a></li><li role=none><a role=treeitem title="Upgrade or downgrade Istio in place." href=/v1.9/docs/setup/upgrade/in-place/>In-place Upgrades</a></li><li role=none><a role=treeitem title="Configuring and upgrading Istio with gateways (experimental)." href=/v1.9/docs/setup/upgrade/gateways/>Managing Gateways with Multiple Revisions [Experimental]</a></li></ul></li><li role=treeitem aria-label="More Guides"><button aria-hidden=true></button><a title="More information on additional setup tasks." href=/v1.9/docs/setup/additional-setup/>More Guides</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Describes the built-in Istio installation configuration profiles." href=/v1.9/docs/setup/additional-setup/config-profiles/>Installation Configuration Profiles</a></li><li role=none><a role=treeitem title="Install the Istio sidecar in application pods automatically using the sidecar injector webhook or manually using istioctl CLI." href=/v1.9/docs/setup/additional-setup/sidecar-injection/>Installing the Sidecar</a></li><li role=none><a role=treeitem title="Install and use Istio with the Istio CNI plugin, allowing operators to deploy services with lower privilege." href=/v1.9/docs/setup/additional-setup/cni/>Install Istio with the Istio CNI plugin</a></li><li role=none><a role=treeitem title="Install an external control plane and remote cluster." href=/v1.9/docs/setup/additional-setup/external-controlplane/>Install Istio with an External Control Plane</a></li></ul></li></ul></div></div><div class=card><button class="header dynamic" id=card77 title="How to do single specific targeted activities with the Istio system." aria-controls=card77-body><svg class="icon tasks"><use xlink:href="/v1.9/img/icons.svg#tasks"/></svg>Tasks</button><div class="body default" aria-labelledby=card77 role=region id=card77-body><ul role=tree aria-expanded=true aria-labelledby=card77><li role=treeitem aria-label="Traffic Management"><button class=show aria-hidden=true></button><a title="Tasks that demonstrate Istio's traffic routing features." href=/v1.9/docs/tasks/traffic-management/>Traffic Management</a><ul role=group aria-expanded=true><li role=none><a role=treeitem title="This task shows you how to configure dynamic request routing to multiple versions of a microservice." href=/v1.9/docs/tasks/traffic-management/request-routing/>Request Routing</a></li><li role=none><a role=treeitem title="This task shows you how to inject faults to test the resiliency of your application." href=/v1.9/docs/tasks/traffic-management/fault-injection/>Fault Injection</a></li><li role=none><a role=treeitem title="Shows you how to migrate traffic from an old to new version of a service." href=/v1.9/docs/tasks/traffic-management/traffic-shifting/>Traffic Shifting</a></li><li role=none><a role=treeitem title="Shows you how to migrate TCP traffic from an old to new version of a TCP service." href=/v1.9/docs/tasks/traffic-management/tcp-traffic-shifting/>TCP Traffic Shifting</a></li><li role=none><a role=treeitem title="This task shows you how to setup request timeouts in Envoy using Istio." href=/v1.9/docs/tasks/traffic-management/request-timeouts/>Request Timeouts</a></li><li role=none><span role=treeitem class=current title="This task shows you how to configure circuit breaking for connections, requests, and outlier detection.">Circuit Breaking</span></li><li role=none><a role=treeitem title="This task demonstrates the traffic mirroring/shadowing capabilities of Istio." href=/v1.9/docs/tasks/traffic-management/mirroring/>Mirroring</a></li><li role=treeitem aria-label="Locality Load Balancing"><button aria-hidden=true></button><a title="This series of tasks demonstrate how to configure locality load balancing in Istio." href=/v1.9/docs/tasks/traffic-management/locality-load-balancing/>Locality Load Balancing</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Initial steps before configuring locality load balancing." href=/v1.9/docs/tasks/traffic-management/locality-load-balancing/before-you-begin/>Before you begin</a></li><li role=none><a role=treeitem title="This task demonstrates how to configure your mesh for locality failover." href=/v1.9/docs/tasks/traffic-management/locality-load-balancing/failover/>Locality failover</a></li><li role=none><a role=treeitem title="This guide demonstrates how to configure locality distribution." href=/v1.9/docs/tasks/traffic-management/locality-load-balancing/distribute/>Locality weighted distribution</a></li><li role=none><a role=treeitem title="Cleanup steps for locality load balancing." href=/v1.9/docs/tasks/traffic-management/locality-load-balancing/cleanup/>Cleanup</a></li></ul></li><li role=treeitem aria-label=Ingress><button aria-hidden=true></button><a title="Controlling ingress traffic for an Istio service mesh." href=/v1.9/docs/tasks/traffic-management/ingress/>Ingress</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Describes how to configure an Istio gateway to expose a service outside of the service mesh." href=/v1.9/docs/tasks/traffic-management/ingress/ingress-control/>Ingress Gateways</a></li><li role=none><a role=treeitem title="Expose a service outside of the service mesh over TLS or mTLS." href=/v1.9/docs/tasks/traffic-management/ingress/secure-ingress/>Secure Gateways</a></li><li role=none><a role=treeitem title="Describes how to configure SNI passthrough for an ingress gateway." href=/v1.9/docs/tasks/traffic-management/ingress/ingress-sni-passthrough/>Ingress Gateway without TLS Termination</a></li><li role=none><a role=treeitem title="Describes how to configure a Kubernetes Ingress object to expose a service outside of the service mesh." href=/v1.9/docs/tasks/traffic-management/ingress/kubernetes-ingress/>Kubernetes Ingress</a></li><li role=none><a role=treeitem title="Describes how to configure the Kubernetes Gateway API with Istio." href=/v1.9/docs/tasks/traffic-management/ingress/gateway-api/>Kubernetes Gateway API</a></li></ul></li><li role=treeitem aria-label=Egress><button aria-hidden=true></button><a title="Controlling egress traffic for an Istio service mesh." href=/v1.9/docs/tasks/traffic-management/egress/>Egress</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Describes how to configure Istio to route traffic from services in the mesh to external services." href=/v1.9/docs/tasks/traffic-management/egress/egress-control/>Accessing External Services</a></li><li role=none><a role=treeitem title="Describes how to configure Istio to perform TLS origination for traffic to external services." href=/v1.9/docs/tasks/traffic-management/egress/egress-tls-origination/>Egress TLS Origination</a></li><li role=none><a role=treeitem title="Describes how to configure Istio to direct traffic to external services through a dedicated gateway." href=/v1.9/docs/tasks/traffic-management/egress/egress-gateway/>Egress Gateways</a></li><li role=none><a role=treeitem title="Describes how to configure an Egress Gateway to perform TLS origination to external services using Secret Discovery Service." href=/v1.9/docs/tasks/traffic-management/egress/egress-gateway-tls-origination-sds/>Egress Gateways with TLS Origination (SDS)</a></li><li role=none><a role=treeitem title="Describes how to configure an Egress Gateway to perform TLS origination to external services using file mount certificates." href=/v1.9/docs/tasks/traffic-management/egress/egress-gateway-tls-origination/>Egress Gateways with TLS Origination (File Mount)</a></li><li role=none><a role=treeitem title="Describes how to enable egress traffic for a set of hosts in a common domain, instead of configuring each and every host separately." href=/v1.9/docs/tasks/traffic-management/egress/wildcard-egress-hosts/>Egress using Wildcard Hosts</a></li><li role=none><a role=treeitem title="Shows how to configure Istio for Kubernetes External Services." href=/v1.9/docs/tasks/traffic-management/egress/egress-kubernetes-services/>Kubernetes Services for Egress Traffic</a></li><li role=none><a role=treeitem title="Describes how to configure Istio to let applications use an external HTTPS proxy." href=/v1.9/docs/tasks/traffic-management/egress/http-proxy/>Using an External HTTPS Proxy</a></li></ul></li></ul></li><li role=treeitem aria-label=Security><button aria-hidden=true></button><a title="Demonstrates how to secure the mesh." href=/v1.9/docs/tasks/security/>Security</a><ul role=group aria-expanded=false><li role=treeitem aria-label="Certificate Management"><button aria-hidden=true></button><a title="Management of the certificates in Istio." href=/v1.9/docs/tasks/security/cert-management/>Certificate Management</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Shows how system administrators can configure Istio's CA with a root certificate, signing certificate and key." href=/v1.9/docs/tasks/security/cert-management/plugin-ca-cert/>Plug in CA Certificates</a></li><li role=none><a role=treeitem title="Shows how to provision and manage DNS certificates in Istio." href=/v1.9/docs/tasks/security/cert-management/dns-cert/>Istio DNS Certificate Management</a></li><li role=none><a role=treeitem title="Shows how to use a Custom Certificate Authority (that integrates with the Kubernetes CSR API) to provision Istio workload certificates (experimental)." href=/v1.9/docs/tasks/security/cert-management/custom-ca-k8s/>Custom CA Integration using Kubernetes CSR [Experimental]</a></li></ul></li><li role=treeitem aria-label=Authentication><button aria-hidden=true></button><a title="Controlling mutual TLS and end-user authentication for mesh services." href=/v1.9/docs/tasks/security/authentication/>Authentication</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Shows you how to use Istio authentication policy to setup mutual TLS and basic end-user authentication." href=/v1.9/docs/tasks/security/authentication/authn-policy/>Authentication Policy</a></li><li role=none><a role=treeitem title="Shows you how to incrementally migrate your Istio services to mutual TLS." href=/v1.9/docs/tasks/security/authentication/mtls-migration/>Mutual TLS Migration</a></li></ul></li><li role=treeitem aria-label=Authorization><button aria-hidden=true></button><a title="Shows how to control access to Istio services." href=/v1.9/docs/tasks/security/authorization/>Authorization</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Shows how to set up access control for HTTP traffic." href=/v1.9/docs/tasks/security/authorization/authz-http/>HTTP Traffic</a></li><li role=none><a role=treeitem title="Shows how to set up access control for TCP traffic." href=/v1.9/docs/tasks/security/authorization/authz-tcp/>TCP Traffic</a></li><li role=none><a role=treeitem title="Shows how to set up access control for JWT token." href=/v1.9/docs/tasks/security/authorization/authz-jwt/>JWT Token</a></li><li role=none><a role=treeitem title="Shows how to integrate and delegate access control to an external authorization system." href=/v1.9/docs/tasks/security/authorization/authz-custom/>External Authorization</a></li><li role=none><a role=treeitem title="Shows how to set up access control to deny traffic explicitly." href=/v1.9/docs/tasks/security/authorization/authz-deny/>Explicit Deny</a></li><li role=none><a role=treeitem title="Shows how to set up access control on an ingress gateway." href=/v1.9/docs/tasks/security/authorization/authz-ingress/>Ingress Gateway</a></li><li role=none><a role=treeitem title="Shows how to migrate from one trust domain to another without changing authorization policy." href=/v1.9/docs/tasks/security/authorization/authz-td-migration/>Trust Domain Migration</a></li></ul></li></ul></li><li role=treeitem aria-label="Policy Enforcement"><button aria-hidden=true></button><a title="Demonstrates policy enforcement features." href=/v1.9/docs/tasks/policy-enforcement/>Policy Enforcement</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="This task shows you how to configure Istio to dynamically limit the traffic to a service." href=/v1.9/docs/tasks/policy-enforcement/rate-limit/>Enabling Rate Limits using Envoy</a></li></ul></li><li role=treeitem aria-label=Observability><button aria-hidden=true></button><a title="Demonstrates how to collect telemetry information from the mesh." href=/v1.9/docs/tasks/observability/>Observability</a><ul role=group aria-expanded=false><li role=treeitem aria-label=Metrics><button aria-hidden=true></button><a title="Demonstrates the collection and querying of metrics within Istio." href=/v1.9/docs/tasks/observability/metrics/>Metrics</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="This task shows you how to configure Istio to collect metrics for TCP services." href=/v1.9/docs/tasks/observability/metrics/tcp-metrics/>Collecting Metrics for TCP Services</a></li><li role=none><a role=treeitem title="This task shows you how to customize the Istio metrics." href=/v1.9/docs/tasks/observability/metrics/customize-metrics/>Customizing Istio Metrics</a></li><li role=none><a role=treeitem title="This task shows you how to improve telemetry by grouping requests and responses by their type." href=/v1.9/docs/tasks/observability/metrics/classify-metrics/>Classifying Metrics Based on Request or Response (Experimental)</a></li><li role=none><a role=treeitem title="This task shows you how to query for Istio Metrics using Prometheus." href=/v1.9/docs/tasks/observability/metrics/querying-metrics/>Querying Metrics from Prometheus</a></li><li role=none><a role=treeitem title="This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic." href=/v1.9/docs/tasks/observability/metrics/using-istio-dashboard/>Visualizing Metrics with Grafana</a></li></ul></li><li role=treeitem aria-label=Logs><button aria-hidden=true></button><a title="Demonstrates the collection of logs within Istio." href=/v1.9/docs/tasks/observability/logs/>Logs</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="This task shows you how to configure Envoy proxies to print access logs to their standard output." href=/v1.9/docs/tasks/observability/logs/access-log/>Getting Envoy's Access Logs</a></li></ul></li><li role=treeitem aria-label="Distributed Tracing"><button aria-hidden=true></button><a title="This task shows you how to configure Istio-enabled applications to collect trace spans." href=/v1.9/docs/tasks/observability/distributed-tracing/>Distributed Tracing</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Overview of distributed tracing in Istio." href=/v1.9/docs/tasks/observability/distributed-tracing/overview/>Overview</a></li><li role=none><a role=treeitem title="Learn how to configure the proxies to send tracing requests to Jaeger." href=/v1.9/docs/tasks/observability/distributed-tracing/jaeger/>Jaeger</a></li><li role=none><a role=treeitem title="Learn how to configure the proxies to send tracing requests to Zipkin." href=/v1.9/docs/tasks/observability/distributed-tracing/zipkin/>Zipkin</a></li><li role=none><a role=treeitem title="How to configure the proxies to send tracing requests to Lightstep." href=/v1.9/docs/tasks/observability/distributed-tracing/lightstep/>Lightstep</a></li><li role=none><a role=treeitem title="How to configure tracing options (beta/experimental)." href=/v1.9/docs/tasks/observability/distributed-tracing/configurability/>Configurability [Beta/Experimental]</a></li></ul></li><li role=none><a role=treeitem title="This task shows you how to visualize your services within an Istio mesh." href=/v1.9/docs/tasks/observability/kiali/>Visualizing Your Mesh</a></li><li role=none><a role=treeitem title="This task shows you how to configure external access to the set of Istio telemetry addons." href=/v1.9/docs/tasks/observability/gateways/>Remotely Accessing Telemetry Addons</a></li></ul></li></ul></div></div><div class=card><button class="header dynamic" id=card100 title="A variety of fully working example uses for Istio that you can experiment with." aria-controls=card100-body><svg class="icon examples"><use xlink:href="/v1.9/img/icons.svg#examples"/></svg>Examples</button><div class=body aria-labelledby=card100 role=region id=card100-body><ul role=tree aria-expanded=true aria-labelledby=card100><li role=none><a role=treeitem title="Deploys a sample application composed of four separate microservices used to demonstrate various Istio features." href=/v1.9/docs/examples/bookinfo/>Bookinfo Application</a></li><li role=none><a role=treeitem title="Run the Bookinfo application with a MySQL service running on a virtual machine within your mesh." href=/v1.9/docs/examples/virtual-machines/>Bookinfo with a Virtual Machine</a></li><li role=treeitem aria-label="Learn Microservices using Kubernetes and Istio"><button aria-hidden=true></button><a title="This modular tutorial provides new users with hands-on experience using Istio for common microservices scenarios, one step at a time." href=/v1.9/docs/examples/microservices-istio/>Learn Microservices using Kubernetes and Istio</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/prereq/>Prerequisites</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/setup-kubernetes-cluster/>Setup a Kubernetes Cluster</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/setup-local-computer/>Setup a Local Computer</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/single/>Run a Microservice Locally</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/package-service/>Run ratings in Docker</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/bookinfo-kubernetes/>Run Bookinfo with Kubernetes</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/production-testing/>Test in production</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/add-new-microservice-version/>Add a new version of reviews</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/add-istio/>Enable Istio on productpage</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/enable-istio-all-microservices/>Enable Istio on all the microservices</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/istio-ingress-gateway/>Configure Istio Ingress Gateway</a></li><li role=none><a role=treeitem href=/v1.9/docs/examples/microservices-istio/logs-istio/>Monitoring with Istio</a></li></ul></li></ul></div></div><div class=card><button class="header dynamic" id=card123 title="Concepts, tools, and techniques to deploy and manage an Istio mesh." aria-controls=card123-body><svg class="icon guide"><use xlink:href="/v1.9/img/icons.svg#guide"/></svg>Operations</button><div class=body aria-labelledby=card123 role=region id=card123-body><ul role=tree aria-expanded=true aria-labelledby=card123><li role=treeitem aria-label=Deployment><button aria-hidden=true></button><a title="Requirements, concepts, and considerations for setting up an Istio deployment." href=/v1.9/docs/ops/deployment/>Deployment</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Describes Istio's high-level architecture and design goals." href=/v1.9/docs/ops/deployment/architecture/>Architecture</a></li><li role=none><a role=treeitem title="Describes the options and considerations when configuring your Istio deployment." href=/v1.9/docs/ops/deployment/deployment-models/>Deployment Models</a></li><li role=none><a role=treeitem title="Describes Istio's high-level architecture for virtual machines." href=/v1.9/docs/ops/deployment/vm-architecture/>Virtual Machine Architecture</a></li><li role=none><a role=treeitem title="Istio performance and scalability summary." href=/v1.9/docs/ops/deployment/performance-and-scalability/>Performance and Scalability</a></li><li role=none><a role=treeitem title="Requirements of applications deployed in an Istio-enabled cluster." href=/v1.9/docs/ops/deployment/requirements/>Application Requirements</a></li></ul></li><li role=treeitem aria-label=Configuration><button aria-hidden=true></button><a title="Advanced concepts and features for configuring a running Istio mesh." href=/v1.9/docs/ops/configuration/>Configuration</a><ul role=group aria-expanded=false><li role=treeitem aria-label="Mesh Configuration"><button aria-hidden=true></button><a title="Helps you manage the global mesh configuration." href=/v1.9/docs/ops/configuration/mesh/>Mesh Configuration</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Provides a general overview of Istio's use of Kubernetes webhooks and the related issues that can arise." href=/v1.9/docs/ops/configuration/mesh/webhook/>Dynamic Admission Webhooks Overview</a></li><li role=none><a role=treeitem title="Describes how to wait until a resource reaches a given status of readiness." href=/v1.9/docs/ops/configuration/mesh/config-resource-ready/>Wait on Resource Status for Applied Configuration</a></li><li role=none><a role=treeitem title="Describes Istio's use of Kubernetes webhooks for automatic sidecar injection." href=/v1.9/docs/ops/configuration/mesh/injection-concepts/>Automatic Sidecar Injection</a></li><li role=none><a role=treeitem title="Shows how to do health checking for Istio services." href=/v1.9/docs/ops/configuration/mesh/app-health-check/>Health Checking of Istio Services</a></li></ul></li><li role=treeitem aria-label="Traffic Management"><button aria-hidden=true></button><a title="Helps you manage the networking aspects of a running mesh." href=/v1.9/docs/ops/configuration/traffic-management/>Traffic Management</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Information on how to specify protocols." href=/v1.9/docs/ops/configuration/traffic-management/protocol-selection/>Protocol Selection</a></li><li role=none><a role=treeitem title="How to configure TLS settings to secure network traffic." href=/v1.9/docs/ops/configuration/traffic-management/tls-configuration/>TLS Configuration</a></li><li role=none><a role=treeitem title="How to configure gateway network topology (experimental)." href=/v1.9/docs/ops/configuration/traffic-management/network-topologies/>Configuring Gateway Network Topology [Experimental]</a></li><li role=none><a role=treeitem title="How to configure DNS proxying." href=/v1.9/docs/ops/configuration/traffic-management/dns-proxy/>DNS Proxying</a></li></ul></li><li role=treeitem aria-label=Security><button aria-hidden=true></button><a title="Helps you manage the security aspects of a running mesh." href=/v1.9/docs/ops/configuration/security/>Security</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Shows common examples of using Istio security policy." href=/v1.9/docs/ops/configuration/security/security-policy-examples/>Security policy examples</a></li><li role=none><a role=treeitem title="Use hardened container images to reduce Istio's attack surface." href=/v1.9/docs/ops/configuration/security/harden-docker-images/>Harden Docker Container Images</a></li></ul></li><li role=treeitem aria-label=Observability><button aria-hidden=true></button><a title="Helps you manage telemetry collection and visualization in a running mesh." href=/v1.9/docs/ops/configuration/telemetry/>Observability</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Fine-grained control of Envoy statistics." href=/v1.9/docs/ops/configuration/telemetry/envoy-stats/>Envoy Statistics</a></li><li role=none><a role=treeitem title="Configure Prometheus to monitor multicluster Istio." href=/v1.9/docs/ops/configuration/telemetry/monitoring-multicluster-prometheus/>Monitoring Multicluster Istio with Prometheus</a></li></ul></li><li role=treeitem aria-label=Extensibility><button aria-hidden=true></button><a title="Helps you manage extensions to the service mesh." href=/v1.9/docs/ops/configuration/extensibility/>Extensibility</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Describes how to make remote WebAssembly modules available in the mesh (experimental)." href=/v1.9/docs/ops/configuration/extensibility/wasm-module-distribution/>Distributing WebAssembly Modules [Experimental]</a></li></ul></li></ul></li><li role=treeitem aria-label="Best Practices"><button aria-hidden=true></button><a title="Best practices for setting up and managing an Istio service mesh." href=/v1.9/docs/ops/best-practices/>Best Practices</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="General best practices when setting up an Istio service mesh." href=/v1.9/docs/ops/best-practices/deployment/>Deployment Best Practices</a></li><li role=none><a role=treeitem title="Configuration best practices to avoid networking or traffic management issues." href=/v1.9/docs/ops/best-practices/traffic-management/>Traffic Management Best Practices</a></li><li role=none><a role=treeitem title="Best practices for securing applications using Istio." href=/v1.9/docs/ops/best-practices/security/>Security Best Practices</a></li><li role=none><a role=treeitem title="Best practices for observing applications using Istio." href=/v1.9/docs/ops/best-practices/observability/>Observability Best Practices</a></li></ul></li><li role=treeitem aria-label="Common Problems"><button aria-hidden=true></button><a title="Describes how to identify and resolve common problems in Istio." href=/v1.9/docs/ops/common-problems/>Common Problems</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Techniques to address common Istio traffic management and network problems." href=/v1.9/docs/ops/common-problems/network-issues/>Traffic Management Problems</a></li><li role=none><a role=treeitem title="Techniques to address common Istio authentication, authorization, and general security-related problems." href=/v1.9/docs/ops/common-problems/security-issues/>Security Problems</a></li><li role=none><a role=treeitem title="Dealing with telemetry collection issues." href=/v1.9/docs/ops/common-problems/observability-issues/>Observability Problems</a></li><li role=none><a role=treeitem title="Resolve common problems with Istio's use of Kubernetes webhooks for automatic sidecar injection." href=/v1.9/docs/ops/common-problems/injection/>Sidecar Injection Problems</a></li><li role=none><a role=treeitem title="Describes how to resolve configuration validation problems." href=/v1.9/docs/ops/common-problems/validation/>Configuration Validation Problems</a></li></ul></li><li role=treeitem aria-label="Diagnostic Tools"><button aria-hidden=true></button><a title="Tools and techniques to help troubleshoot an Istio mesh." href=/v1.9/docs/ops/diagnostic-tools/>Diagnostic Tools</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Istio includes a supplemental tool that provides debugging and diagnosis for Istio service mesh deployments." href=/v1.9/docs/ops/diagnostic-tools/istioctl/>Using the Istioctl Command-line Tool</a></li><li role=none><a role=treeitem title="Describes tools and techniques to diagnose issues with Virtual Machines." href=/v1.9/docs/ops/diagnostic-tools/virtual-machines/>Debugging Virtual Machines</a></li><li role=none><a role=treeitem title="Describes tools and techniques to diagnose Envoy configuration issues related to traffic management." href=/v1.9/docs/ops/diagnostic-tools/proxy-cmd/>Debugging Envoy and Istiod</a></li><li role=none><a role=treeitem title="Shows you how to use istioctl describe to verify the configurations of a pod in your mesh." href=/v1.9/docs/ops/diagnostic-tools/istioctl-describe/>Understand your Mesh with Istioctl Describe</a></li><li role=none><a role=treeitem title="Shows you how to use istioctl analyze to identify potential issues with your configuration." href=/v1.9/docs/ops/diagnostic-tools/istioctl-analyze/>Diagnose your Configuration with Istioctl Analyze</a></li><li role=none><a role=treeitem title="Describes how to use ControlZ to get insight into a running istiod component." href=/v1.9/docs/ops/diagnostic-tools/controlz/>Istiod Introspection</a></li><li role=none><a role=treeitem title="Describes how to use component-level logging to get insights into a running component's behavior." href=/v1.9/docs/ops/diagnostic-tools/component-logging/>Component Logging</a></li></ul></li><li role=treeitem aria-label=Integrations><button aria-hidden=true></button><a title="Other software that Istio can integrate with to provide additional functionality." href=/v1.9/docs/ops/integrations/>Integrations</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Information on how to integrate with cert-manager." href=/v1.9/docs/ops/integrations/certmanager/>cert-manager</a></li><li role=none><a role=treeitem title="Information on how to integrate with Grafana to set up Istio dashboards." href=/v1.9/docs/ops/integrations/grafana/>Grafana</a></li><li role=none><a role=treeitem title="How to integrate with Jaeger." href=/v1.9/docs/ops/integrations/jaeger/>Jaeger</a></li><li role=none><a role=treeitem title="Information on how to integrate with Kiali." href=/v1.9/docs/ops/integrations/kiali/>Kiali</a></li><li role=none><a role=treeitem title="How to integrate with Prometheus." href=/v1.9/docs/ops/integrations/prometheus/>Prometheus</a></li><li role=none><a role=treeitem title="How to integrate with Zipkin." href=/v1.9/docs/ops/integrations/zipkin/>Zipkin</a></li></ul></li></ul></div></div><div class=card><button class="header dynamic" id=card176 title="Detailed authoritative reference material such as command-line options, configuration options, and API calling parameters." aria-controls=card176-body><svg class="icon reference"><use xlink:href="/v1.9/img/icons.svg#reference"/></svg>Reference</button><div class=body aria-labelledby=card176 role=region id=card176-body><ul role=tree aria-expanded=true aria-labelledby=card176><li role=treeitem aria-label=Configuration><button aria-hidden=true></button><a title="Detailed information on configuration options." href=/v1.9/docs/reference/config/>Configuration</a><ul role=group aria-expanded=false><li role=none><a role=treeitem title="Configuration affecting the service mesh as a whole." href=/v1.9/docs/reference/config/istio.mesh.v1alpha1/>Global Mesh Options</a></li><li role=none><a role=treeitem title="Configuration affecting Istio control plane installation version and shape." href=/v1.9/docs/reference/config/istio.operator.v1alpha1/>IstioOperator Options</a></li><li role=none><a role=treeitem title="Describes the structure of messages generated by Istio analyzers." href=/v1.9/docs/reference/config/istio.analysis.v1alpha1/>Analysis Messages</a></li><li role=none><a role=treeitem title="Describes the role of the `status` field in configuration workflow." href=/v1.9/docs/reference/config/config-status/>Configuration Status Field</a></li><li role=treeitem aria-label="Proxy Extensions"><button aria-hidden=true></button><a title="Describes how to configure Istio proxy extensions." href=/v1.9/docs/reference/config/proxy_extensions/>Proxy Extensions</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Configuration for Attribute Generation plugin." href=/v1.9/docs/reference/config/proxy_extensions/attributegen/>AttributeGen Config</a></li><li role=none><a role=treeitem title="Configuration for Stackdriver filter." href=/v1.9/docs/reference/config/proxy_extensions/stackdriver/>Stackdriver Config</a></li><li role=none><a role=treeitem title="Configuration for Stats Filter." href=/v1.9/docs/reference/config/proxy_extensions/stats/>Stats Config</a></li><li role=none><a role=treeitem title="Configuration for AccessLogPolicy Filter." href=/v1.9/docs/reference/config/proxy_extensions/accesslogpolicy/>AccessLogPolicy Config</a></li><li role=none><a role=treeitem title="Configuration for Metadata Exchange Filter." href=/v1.9/docs/reference/config/proxy_extensions/metadata_exchange/>Metadata Exchange Config</a></li><li role=none><a role=treeitem title="How to enable telemetry generation with the Wasm runtime (experimental)." href=/v1.9/docs/reference/config/proxy_extensions/wasm_telemetry/>Wasm-based Telemetry [Experimental]</a></li></ul></li><li role=treeitem aria-label="Traffic Management"><button aria-hidden=true></button><a title="Describes how to configure HTTP/TCP routing features." href=/v1.9/docs/reference/config/networking/>Traffic Management</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Configuration affecting load balancing, outlier detection, etc." href=/v1.9/docs/reference/config/networking/destination-rule/>Destination Rule</a></li><li role=none><a role=treeitem title="Customizing Envoy configuration generated by Istio." href=/v1.9/docs/reference/config/networking/envoy-filter/>Envoy Filter</a></li><li role=none><a role=treeitem title="Configuration affecting edge load balancer." href=/v1.9/docs/reference/config/networking/gateway/>Gateway</a></li><li role=none><a role=treeitem title="Configuration affecting label/content routing, sni routing, etc." href=/v1.9/docs/reference/config/networking/virtual-service/>Virtual Service</a></li><li role=none><a role=treeitem title="Configuration affecting service registry." href=/v1.9/docs/reference/config/networking/service-entry/>Service Entry</a></li><li role=none><a role=treeitem title="Configuration affecting network reachability of a sidecar." href=/v1.9/docs/reference/config/networking/sidecar/>Sidecar</a></li><li role=none><a role=treeitem title="Describes a collection of workload instances." href=/v1.9/docs/reference/config/networking/workload-group/>Workload Group</a></li><li role=none><a role=treeitem title="Configuration affecting VMs onboarded into the mesh." href=/v1.9/docs/reference/config/networking/workload-entry/>Workload Entry</a></li></ul></li><li role=treeitem aria-label=Security><button aria-hidden=true></button><a title="Describes how to configure Istio's security features." href=/v1.9/docs/reference/config/security/>Security</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Configuration to validate JWT." href=/v1.9/docs/reference/config/security/jwt/>JWTRule</a></li><li role=none><a role=treeitem title="Peer authentication configuration for workloads." href=/v1.9/docs/reference/config/security/peer_authentication/>PeerAuthentication</a></li><li role=none><a role=treeitem title="Request authentication configuration for workloads." href=/v1.9/docs/reference/config/security/request_authentication/>RequestAuthentication</a></li><li role=none><a role=treeitem title="Configuration for access control on workloads." href=/v1.9/docs/reference/config/security/authorization-policy/>Authorization Policy</a></li><li role=none><a role=treeitem title="Describes the supported conditions in authorization policies." href=/v1.9/docs/reference/config/security/conditions/>Authorization Policy Conditions</a></li></ul></li><li role=treeitem aria-label="Common Types"><button aria-hidden=true></button><a title="Describes common types in Istio API." href=/v1.9/docs/reference/config/type/>Common Types</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Definition of a workload selector." href=/v1.9/docs/reference/config/type/workload-selector/>Workload Selector</a></li></ul></li><li role=none><a role=treeitem title="Istio standard metrics exported by Istio telemetry." href=/v1.9/docs/reference/config/metrics/>Istio Standard Metrics</a></li><li role=none><a role=treeitem title="Resource annotations used by Istio." href=/v1.9/docs/reference/config/annotations/>Resource Annotations</a></li><li role=none><a role=treeitem title="Resource labels used by Istio." href=/v1.9/docs/reference/config/labels/>Resource Labels</a></li><li role=treeitem aria-label="Configuration Analysis Messages"><button aria-hidden=true></button><a title="Documents the individual error and warning messages produced during configuration analysis." href=/v1.9/docs/reference/config/analysis/>Configuration Analysis Messages</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0113/>MTLSPolicyConflict</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/message-format/>Analyzer Message Format</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0109/>ConflictingMeshGatewayVirtualServiceHosts</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0110/>ConflictingSidecarWorkloadSelectors</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0116/>DeploymentAssociatedToMultipleServices</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0117/>DeploymentRequiresServiceAssociated</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0002/>Deprecated</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0135/>DeprecatedAnnotation</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0104/>GatewayPortNotOnWorkload</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0001/>InternalError</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0125/>InvalidAnnotation</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0122/>InvalidRegexp</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0105/>IstioProxyImageMismatch</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0119/>JwtFailureDueToInvalidServicePortPrefix</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0107/>MisplacedAnnotation</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0111/>MultipleSidecarsWithoutWorkloadSelectors</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0123/>NamespaceMultipleInjectionLabels</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0102/>NamespaceNotInjected</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0127/>NoMatchingWorkloadsFound</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0128/>NoServerCertificateVerificationDestinationLevel</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0129/>NoServerCertificateVerificationPortLevel</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0136/>AlphaAnnotation</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0103/>PodMissingProxy</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0131/>VirtualServiceIneffectiveMatch</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0101/>ReferencedResourceNotFound</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0106/>SchemaValidationError</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0134/>ServiceEntryAddressesRequired</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0108/>UnknownAnnotation</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0130/>VirtualServiceUnreachableRule</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0118/>PortNameIsNotUnderNamingConvention</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0132/>VirtualServiceHostNotFoundInGateway</a></li><li role=none><a role=treeitem href=/v1.9/docs/reference/config/analysis/ist0112/>VirtualServiceDestinationPortSelectorRequired</a></li></ul></li></ul></li><li role=treeitem aria-label=Commands><button aria-hidden=true></button><a title="Describes usage and options of the Istio commands and utilities." href=/v1.9/docs/reference/commands/>Commands</a><ul role=group aria-expanded=false class=leaf-section><li role=none><a role=treeitem title="Istio control interface." href=/v1.9/docs/reference/commands/istioctl/>istioctl</a></li><li role=none><a role=treeitem title="Istio Pilot." href=/v1.9/docs/reference/commands/pilot-discovery/>pilot-discovery</a></li><li role=none><a role=treeitem title="The Istio operator." href=/v1.9/docs/reference/commands/operator/>operator</a></li><li role=none><a role=treeitem title="Istio Pilot agent." href=/v1.9/docs/reference/commands/pilot-agent/>pilot-agent</a></li></ul></li><li role=none><a role=treeitem title="A glossary of common Istio terms." href=/v1.9/docs/reference/glossary/>Glossary</a></li></ul></div></div></div></nav></div><div class=article-container><button tabindex=-1 id=sidebar-toggler title="Toggle the navigation bar"><svg class="icon pull"><use xlink:href="/v1.9/img/icons.svg#pull"/></svg></button><nav aria-label=Breadcrumb><ol><li><a href=/v1.9/ title="Connect, secure, control, and observe services.">Istio</a></li><li><a href=/v1.9/docs/ title="Learn how to deploy, use, and operate Istio.">Docs</a></li><li><a href=/v1.9/docs/tasks/ title="How to do single specific targeted activities with the Istio system.">Tasks</a></li><li><a href=/v1.9/docs/tasks/traffic-management/ title="Tasks that demonstrate Istio's traffic routing features.">Traffic Management</a></li><li>Circuit Breaking</li></ol></nav><article aria-labelledby=title><div class=title-area><div style=width:100%><h1 id=title>Circuit Breaking</h1><p class=byline><span title="1462 words"><svg class="icon clock"><use xlink:href="/v1.9/img/icons.svg#clock"/></svg><span>&nbsp;</span>7 minute read</span>
<span>&nbsp;</span>
<span><a href=https://github.com/istio/istio.io/tree/master/README.md#testing-document-content title="An automated test is available for this page. Click for details."><svg class="icon checkmark"><use xlink:href="/v1.9/img/icons.svg#checkmark"/></svg><span>&nbsp;</span>
page test</a></span></p></div></div><nav class=toc-inlined aria-label="Table of Contents"><div><hr><ol><li role=none aria-label="Before you begin"><a href=#before-you-begin>Before you begin</a><li role=none aria-label="Configuring the circuit breaker"><a href=#configuring-the-circuit-breaker>Configuring the circuit breaker</a><li role=none aria-label="Adding a client"><a href=#adding-a-client>Adding a client</a><li role=none aria-label="Tripping the circuit breaker"><a href=#tripping-the-circuit-breaker>Tripping the circuit breaker</a><li role=none aria-label="Cleaning up"><a href=#cleaning-up>Cleaning up</a><li role=none aria-label="See also"><a href=#see-also>See also</a></li></ol><hr></div></nav><p>This task shows you how to configure circuit breaking for connections, requests,
and outlier detection.</p><p>Circuit breaking is an important pattern for creating resilient microservice
applications. Circuit breaking allows you to write applications that limit the impact of failures, latency spikes, and other undesirable effects of network peculiarities.</p><p>In this task, you will configure circuit breaking rules and then test the
configuration by intentionally &ldquo;tripping&rdquo; the circuit breaker.</p><h2 id=before-you-begin>Before you begin</h2><ul><li>Setup Istio by following the instructions in the
<a href=/v1.9/docs/setup/>Installation guide</a>.</li></ul><ul><li><p>Start the <a href=https://github.com/istio/istio/tree/release-1.9/samples/httpbin>httpbin</a> sample.</p><p>If you have enabled <a href=/v1.9/docs/setup/additional-setup/sidecar-injection/#automatic-sidecar-injection>automatic sidecar injection</a>, deploy the <code>httpbin</code> service:</p><div><a data-skipendnotes=true style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.9/samples/httpbin/httpbin.yaml>Zip</a><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl apply -f @samples/httpbin/httpbin.yaml@
</code></pre></div><p>Otherwise, you have to manually inject the sidecar before deploying the <code>httpbin</code> application:</p><div><a data-skipendnotes=true style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.9/samples/httpbin/httpbin.yaml>Zip</a><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl apply -f &lt;(istioctl kube-inject -f @samples/httpbin/httpbin.yaml@)
</code></pre></div></li></ul><p>The <code>httpbin</code> application serves as the backend service for this task.</p><h2 id=configuring-the-circuit-breaker>Configuring the circuit breaker</h2><ol><li><p>Create a <a href=/v1.9/docs/reference/config/networking/destination-rule/>destination rule</a> to apply circuit breaking settings
when calling the <code>httpbin</code> service:</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.9/img/icons.svg#callout-warning"/></svg></div><div class=content>If you installed/configured Istio with mutual TLS authentication enabled, you must add a TLS traffic policy <code>mode: ISTIO_MUTUAL</code> to the <code>DestinationRule</code> before applying it.
Otherwise requests will generate 503 errors as described <a href=/v1.9/docs/ops/common-problems/network-issues/#503-errors-after-setting-destination-rule>here</a>.</div></aside></div><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl apply -f - &lt;&lt;EOF
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: httpbin
spec:
host: httpbin
trafficPolicy:
connectionPool:
tcp:
maxConnections: 1
http:
http1MaxPendingRequests: 1
maxRequestsPerConnection: 1
outlierDetection:
consecutive5xxErrors: 1
interval: 1s
baseEjectionTime: 3m
maxEjectionPercent: 100
EOF
</code></pre></li><li><p>Verify the destination rule was created correctly:</p><pre><code class=language-bash data-expandlinks=true data-outputis=yaml data-repo=istio>$ kubectl get destinationrule httpbin -o yaml
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
...
spec:
host: httpbin
trafficPolicy:
connectionPool:
http:
http1MaxPendingRequests: 1
maxRequestsPerConnection: 1
tcp:
maxConnections: 1
outlierDetection:
baseEjectionTime: 3m
consecutive5xxErrors: 1
interval: 1s
maxEjectionPercent: 100
</code></pre></li></ol><h2 id=adding-a-client>Adding a client</h2><p>Create a client to send traffic to the <code>httpbin</code> service. The client is
a simple load-testing client called <a href=https://github.com/istio/fortio>fortio</a>.
Fortio lets you control the number of connections, concurrency, and
delays for outgoing HTTP calls. You will use this client to &ldquo;trip&rdquo; the circuit breaker
policies you set in the <code>DestinationRule</code>. </p><ol><li><p>Inject the client with the Istio sidecar proxy so network interactions are
governed by Istio.</p><p>If you have enabled <a href=/v1.9/docs/setup/additional-setup/sidecar-injection/#automatic-sidecar-injection>automatic sidecar injection</a>, deploy the <code>fortio</code> service:</p><div><a data-skipendnotes=true style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.9/samples/httpbin/sample-client/fortio-deploy.yaml>Zip</a><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl apply -f @samples/httpbin/sample-client/fortio-deploy.yaml@
</code></pre></div><p>Otherwise, you have to manually inject the sidecar before deploying the <code>fortio</code> application:</p><div><a data-skipendnotes=true style=display:none href=https://raw.githubusercontent.com/istio/istio/release-1.9/samples/httpbin/sample-client/fortio-deploy.yaml>Zip</a><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl apply -f &lt;(istioctl kube-inject -f @samples/httpbin/sample-client/fortio-deploy.yaml@)
</code></pre></div></li><li><p>Log in to the client pod and use the fortio tool to call <code>httpbin</code>.
Pass in <code>curl</code> to indicate that you just want to make one call:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ export FORTIO_POD=$(kubectl get pods -lapp=fortio -o &#39;jsonpath={.items[0].metadata.name}&#39;)
$ kubectl exec &#34;$FORTIO_POD&#34; -c fortio -- /usr/bin/fortio curl -quiet http://httpbin:8000/get
HTTP/1.1 200 OK
server: envoy
date: Tue, 25 Feb 2020 20:25:52 GMT
content-type: application/json
content-length: 586
access-control-allow-origin: *
access-control-allow-credentials: true
x-envoy-upstream-service-time: 36
{
&#34;args&#34;: {},
&#34;headers&#34;: {
&#34;Content-Length&#34;: &#34;0&#34;,
&#34;Host&#34;: &#34;httpbin:8000&#34;,
&#34;User-Agent&#34;: &#34;fortio.org/fortio-1.3.1&#34;,
&#34;X-B3-Parentspanid&#34;: &#34;8fc453fb1dec2c22&#34;,
&#34;X-B3-Sampled&#34;: &#34;1&#34;,
&#34;X-B3-Spanid&#34;: &#34;071d7f06bc94943c&#34;,
&#34;X-B3-Traceid&#34;: &#34;86a929a0e76cda378fc453fb1dec2c22&#34;,
&#34;X-Forwarded-Client-Cert&#34;: &#34;By=spiffe://cluster.local/ns/default/sa/httpbin;Hash=68bbaedefe01ef4cb99e17358ff63e92d04a4ce831a35ab9a31d3c8e06adb038;Subject=\&#34;\&#34;;URI=spiffe://cluster.local/ns/default/sa/default&#34;
},
&#34;origin&#34;: &#34;127.0.0.1&#34;,
&#34;url&#34;: &#34;http://httpbin:8000/get&#34;
}
</code></pre></li></ol><p>You can see the request succeeded! Now, it&rsquo;s time to break something.</p><h2 id=tripping-the-circuit-breaker>Tripping the circuit breaker</h2><p>In the <code>DestinationRule</code> settings, you specified <code>maxConnections: 1</code> and
<code>http1MaxPendingRequests: 1</code>. These rules indicate that if you exceed more than
one connection and request concurrently, you should see some failures when the
<code>istio-proxy</code> opens the circuit for further requests and connections.</p><ol><li><p>Call the service with two concurrent connections (<code>-c 2</code>) and send 20 requests
(<code>-n 20</code>):</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl exec &#34;$FORTIO_POD&#34; -c fortio -- /usr/bin/fortio load -c 2 -qps 0 -n 20 -loglevel Warning http://httpbin:8000/get
20:33:46 I logger.go:97&gt; Log level is now 3 Warning (was 2 Info)
Fortio 1.3.1 running at 0 queries per second, 6-&gt;6 procs, for 20 calls: http://httpbin:8000/get
Starting at max qps with 2 thread(s) [gomax 6] for exactly 20 calls (10 per thread + 0)
20:33:46 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:33:47 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:33:47 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
Ended after 59.8524ms : 20 calls. qps=334.16
Aggregated Function Time : count 20 avg 0.0056869 +/- 0.003869 min 0.000499 max 0.0144329 sum 0.113738
# range, mid point, percentile, count
&gt;= 0.000499 &lt;= 0.001 , 0.0007495 , 10.00, 2
&gt; 0.001 &lt;= 0.002 , 0.0015 , 15.00, 1
&gt; 0.003 &lt;= 0.004 , 0.0035 , 45.00, 6
&gt; 0.004 &lt;= 0.005 , 0.0045 , 55.00, 2
&gt; 0.005 &lt;= 0.006 , 0.0055 , 60.00, 1
&gt; 0.006 &lt;= 0.007 , 0.0065 , 70.00, 2
&gt; 0.007 &lt;= 0.008 , 0.0075 , 80.00, 2
&gt; 0.008 &lt;= 0.009 , 0.0085 , 85.00, 1
&gt; 0.011 &lt;= 0.012 , 0.0115 , 90.00, 1
&gt; 0.012 &lt;= 0.014 , 0.013 , 95.00, 1
&gt; 0.014 &lt;= 0.0144329 , 0.0142165 , 100.00, 1
# target 50% 0.0045
# target 75% 0.0075
# target 90% 0.012
# target 99% 0.0143463
# target 99.9% 0.0144242
Sockets used: 4 (for perfect keepalive, would be 2)
Code 200 : 17 (85.0 %)
Code 503 : 3 (15.0 %)
Response Header Sizes : count 20 avg 195.65 +/- 82.19 min 0 max 231 sum 3913
Response Body/Total Sizes : count 20 avg 729.9 +/- 205.4 min 241 max 817 sum 14598
All done 20 calls (plus 0 warmup) 5.687 ms avg, 334.2 qps
</code></pre><p>It&rsquo;s interesting to see that almost all requests made it through! The <code>istio-proxy</code>
does allow for some leeway.</p><pre><code class=language-plain data-expandlinks=true data-repo=istio>Code 200 : 17 (85.0 %)
Code 503 : 3 (15.0 %)
</code></pre></li><li><p>Bring the number of concurrent connections up to 3:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl exec &#34;$FORTIO_POD&#34; -c fortio -- /usr/bin/fortio load -c 3 -qps 0 -n 30 -loglevel Warning http://httpbin:8000/get
20:32:30 I logger.go:97&gt; Log level is now 3 Warning (was 2 Info)
Fortio 1.3.1 running at 0 queries per second, 6-&gt;6 procs, for 30 calls: http://httpbin:8000/get
Starting at max qps with 3 thread(s) [gomax 6] for exactly 30 calls (10 per thread + 0)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
20:32:30 W http_client.go:679&gt; Parsed non ok code 503 (HTTP/1.1 503)
Ended after 51.9946ms : 30 calls. qps=576.98
Aggregated Function Time : count 30 avg 0.0040001633 +/- 0.003447 min 0.0004298 max 0.015943 sum 0.1200049
# range, mid point, percentile, count
&gt;= 0.0004298 &lt;= 0.001 , 0.0007149 , 16.67, 5
&gt; 0.001 &lt;= 0.002 , 0.0015 , 36.67, 6
&gt; 0.002 &lt;= 0.003 , 0.0025 , 50.00, 4
&gt; 0.003 &lt;= 0.004 , 0.0035 , 60.00, 3
&gt; 0.004 &lt;= 0.005 , 0.0045 , 66.67, 2
&gt; 0.005 &lt;= 0.006 , 0.0055 , 76.67, 3
&gt; 0.006 &lt;= 0.007 , 0.0065 , 83.33, 2
&gt; 0.007 &lt;= 0.008 , 0.0075 , 86.67, 1
&gt; 0.008 &lt;= 0.009 , 0.0085 , 90.00, 1
&gt; 0.009 &lt;= 0.01 , 0.0095 , 96.67, 2
&gt; 0.014 &lt;= 0.015943 , 0.0149715 , 100.00, 1
# target 50% 0.003
# target 75% 0.00583333
# target 90% 0.009
# target 99% 0.0153601
# target 99.9% 0.0158847
Sockets used: 20 (for perfect keepalive, would be 3)
Code 200 : 11 (36.7 %)
Code 503 : 19 (63.3 %)
Response Header Sizes : count 30 avg 84.366667 +/- 110.9 min 0 max 231 sum 2531
Response Body/Total Sizes : count 30 avg 451.86667 +/- 277.1 min 241 max 817 sum 13556
All done 30 calls (plus 0 warmup) 4.000 ms avg, 577.0 qps
</code></pre><p>Now you start to see the expected circuit breaking behavior. Only 36.7% of the
requests succeeded and the rest were trapped by circuit breaking:</p><pre><code class=language-plain data-expandlinks=true data-repo=istio>Code 200 : 11 (36.7 %)
Code 503 : 19 (63.3 %)
</code></pre></li><li><p>Query the <code>istio-proxy</code> stats to see more:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl exec &#34;$FORTIO_POD&#34; -c istio-proxy -- pilot-agent request GET stats | grep httpbin | grep pending
cluster.outbound|8000||httpbin.default.svc.cluster.local.circuit_breakers.default.rq_pending_open: 0
cluster.outbound|8000||httpbin.default.svc.cluster.local.circuit_breakers.high.rq_pending_open: 0
cluster.outbound|8000||httpbin.default.svc.cluster.local.upstream_rq_pending_active: 0
cluster.outbound|8000||httpbin.default.svc.cluster.local.upstream_rq_pending_failure_eject: 0
cluster.outbound|8000||httpbin.default.svc.cluster.local.upstream_rq_pending_overflow: 21
cluster.outbound|8000||httpbin.default.svc.cluster.local.upstream_rq_pending_total: 29
</code></pre><p>You can see <code>21</code> for the <code>upstream_rq_pending_overflow</code> value which means <code>21</code>
calls so far have been flagged for circuit breaking.</p></li></ol><h2 id=cleaning-up>Cleaning up</h2><ol><li><p>Remove the rules:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl delete destinationrule httpbin
</code></pre></li><li><p>Shutdown the <a href=https://github.com/istio/istio/tree/release-1.9/samples/httpbin>httpbin</a> service and client:</p><pre><code class=language-bash data-expandlinks=true data-repo=istio>$ kubectl delete deploy httpbin fortio-deploy
$ kubectl delete svc httpbin fortio
</code></pre></li></ol><nav id=see-also><h2>See also</h2><div class=see-also><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2020/alb-ingress-gateway-iks/>Direct encrypted traffic from IBM Cloud Kubernetes Service Ingress to Istio Ingress Gateway</a></p><p class=desc>Configure the IBM Cloud Kubernetes Service Application Load Balancer to direct traffic to the Istio Ingress gateway with mutual TLS.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2020/multi-cluster-mesh-automation/>Multicluster Istio configuration and service discovery using Admiral</a></p><p class=desc>Automating Istio configuration for Istio deployments (clusters) that work as a single mesh.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2019/proxy/>Istio as a Proxy for External Services</a></p><p class=desc>Configure Istio ingress gateway to act as a proxy for external services.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2019/isolated-clusters/>Multi-Mesh Deployments for Isolation and Boundary Protection</a></p><p class=desc>Deploy environments that require isolation into separate meshes and enable inter-mesh communication by mesh federation.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2019/egress-traffic-control-in-istio-part-3/>Secure Control of Egress Traffic in Istio, part 3</a></p><p class=desc>Comparison of alternative solutions to control egress traffic including performance considerations.</p></div><div class=entry><p class=link><a data-skipendnotes=true href=/v1.9/blog/2019/egress-traffic-control-in-istio-part-2/>Secure Control of Egress Traffic in Istio, part 2</a></p><p class=desc>Use Istio Egress Traffic Control to prevent attacks involving egress traffic.</p></div></div></nav></article><nav class=pagenav><div class=left><a title="This task shows you how to setup request timeouts in Envoy using Istio." href=/v1.9/docs/tasks/traffic-management/request-timeouts/><svg class="icon left-arrow"><use xlink:href="/v1.9/img/icons.svg#left-arrow"/></svg>Request Timeouts</a></div><div class=right><a title="This task demonstrates the traffic mirroring/shadowing capabilities of Istio." href=/v1.9/docs/tasks/traffic-management/mirroring/>Mirroring<svg class="icon right-arrow"><use xlink:href="/v1.9/img/icons.svg#right-arrow"/></svg></a></div></nav><div id=feedback><div id=feedback-initial>Was this information useful?<br><button class="btn feedback" onclick="sendFeedback('en',1)">Yes</button>
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