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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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<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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<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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<a title="Describes tasks that demonstrate traffic routing features of Istio service mesh." href="/v0.8/docs/tasks/traffic-management/">Traffic Management </a>
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<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>
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<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>
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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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<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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<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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<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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<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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<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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<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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<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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<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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<a title="Demonstrates how to secure the mesh." href="/v0.8/docs/tasks/security/">Security </a>
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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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<a title="Shows you how to verify and test Istio&#39;s automatic mutual TLS authentication." href="/v0.8/docs/tasks/security/mutual-tls/">Testing Mutual TLS</a>
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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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<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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<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>
<span class="current" title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key.">Plugging in external CA key and certificate</span>
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<li>
<a title="Shows how to enable Citadel health checking with Kubernetes." href="/v0.8/docs/tasks/security/health-check/">Citadel health checking</a>
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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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<a title="Demonstrates policy enforcement features." href="/v0.8/docs/tasks/policy-enforcement/">Policies </a>
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<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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<a title="Demonstrates how to collect telemetry information from the mesh." href="/v0.8/docs/tasks/telemetry/">Telemetry </a>
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<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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<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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<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>
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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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<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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<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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<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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Guides
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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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<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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<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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<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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<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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Performance and Scalability
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<a title="Provides a conceptual introduction to Istio&#39;s Performance and Scalability" href="/v0.8/docs/performance-and-scalability/overview/">Overview</a>
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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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<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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<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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<h1 id="title">Plugging in external CA key and certificate</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="#plugging-in-the-existing-certificate-and-key">Plugging in the existing certificate and key</a></li>
<li><a href="#verifying-the-new-certificates">Verifying the new certificates</a></li>
<li><a href="#cleanup">Cleanup</a></li>
<li><a href="#whats-next">What's next</a></li>
</ul>
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<p>This task shows how operators can configure Citadel with existing root certificate, signing certificate and key.</p>
<p>By default, Citadel generates self-signed root certificate and key, and uses them to sign the workload certificates.
Citadel can also use the operator-specified certificate and key to sign workload certificates, with
operator-specified root certificate. This task demonstrates an example to plug certificates and key into Citadel.</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>From 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="plugging-in-the-existing-certificate-and-key">Plugging in the existing certificate and key</h2>
<p>Suppose we want to have Citadel use the existing signing (CA) certificate <code>ca-cert.pem</code> and key <code>ca-key.pem</code>.
Furthermore, the certificate <code>ca-cert.pem</code> is signed by the root certificate <code>root-cert.pem</code>.
We would like to use <code>root-cert.pem</code> as the root certificate for Istio workloads.</p>
<p>In the following example,
Citadel's signing (CA) certificate (<code>ca-cert.pem</code>) is different from root certificate (<code>root-cert.pem</code>),
so the workload cannot validate the workload certificates directly from the root certificate.
The workload needs a <code>cert-chain.pem</code> file to specify the chain of trust,
which should include the certificates of all the intermediate CAs between the workloads and the root CA.
In our example, it contains Citadel's signing certificate, so <code>cert-chain.pem</code> is the same as <code>ca-cert.pem</code>.
Note that if your <code>ca-cert.pem</code> is the same as <code>root-cert.pem</code>, the <code>cert-chain.pem</code> file should be empty.</p>
<p>These files are ready to use in the <code>samples/certs/</code> directory.</p>
<p>The following steps enable plugging in the certificates and key into Citadel:</p>
<ol>
<li>
<p>Create a secret <code>cacert</code> including all the input files <code>ca-cert.pem</code>, <code>ca-key.pem</code>, <code>root-cert.pem</code> and <code>cert-chain.pem</code>:</p>
<pre><code class="language-command" data-lang="command">$ kubectl create secret generic cacerts -n istio-system --from-file=samples/certs/ca-cert.pem \
--from-file=samples/certs/ca-key.pem --from-file=samples/certs/root-cert.pem \
--from-file=samples/certs/cert-chain.pem
</code></pre></li>
<li>
<p>Redeploy Citadel, which reads the certificates and key from the secret-mount files:</p>
<pre><code class="language-command" data-lang="command">$ kubectl apply -f @install/kubernetes/istio-citadel-plugin-certs.yaml@
</code></pre><blockquote>
<p>Note: if you are using different certificate/key file or secret names,
you need to change corresponding volume mounts and arguments in <code>istio-citadel-plugin-certs.yaml</code>.</p>
</blockquote>
</li>
<li>
<p>To make sure the workloads obtain the new certificates promptly,
delete the secrets generated by Citadel (named as istio.*).
In this example, <code>istio.default</code>. Citadel will issue new certificates for the workloads.</p>
<pre><code class="language-command" data-lang="command">$ kubectl delete secret istio.default
</code></pre></li>
</ol>
<h2 id="verifying-the-new-certificates">Verifying the new certificates</h2>
<p>In this section, we verify that the new workload certificates and root certificates are propagated.
This requires you have <code>openssl</code> installed on your machine.</p>
<ol>
<li>
<p>Deploy the bookinfo application following the <a href="/v0.8/docs/guides/bookinfo/">instructions</a>.</p>
</li>
<li>
<p>Retrieve the mounted certificates.
In the following, we take the ratings pod as an example, and verify the certificates mounted on the pod.</p>
<p>Set the pod name to <code>RATINGSPOD</code>:</p>
<pre><code class="language-command" data-lang="command">$ RATINGSPOD=`kubectl get pods -l app=ratings -o jsonpath='{.items[0].metadata.name}'`
</code></pre><p>Run the following commands to retrieve the certificates mounted on the proxy:</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec -it $RATINGSPOD -c istio-proxy -- /bin/cat /etc/certs/root-cert.pem &gt; /tmp/pod-root-cert.pem
</code></pre><p>The file <code>/tmp/pod-root-cert.pem</code> contains the root certificate propagated to the pod.</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec -it $RATINGSPOD -c istio-proxy -- /bin/cat /etc/certs/cert-chain.pem &gt; /tmp/pod-cert-chain.pem
</code></pre><p>The file <code>/tmp/pod-cert-chain.pem</code> contains the workload certificate and the CA certificate propagated to the pod.</p>
</li>
<li>
<p>Verify the root certificate is the same as the one specified by operator:</p>
<pre><code class="language-command" data-lang="command">$ openssl x509 -in @samples/certs/root-cert.pem@ -text -noout &gt; /tmp/root-cert.crt.txt
$ openssl x509 -in /tmp/pod-root-cert.pem -text -noout &gt; /tmp/pod-root-cert.crt.txt
$ diff /tmp/root-cert.crt.txt /tmp/pod-root-cert.crt.txt
</code></pre><p>Expect the output to be empty.</p>
</li>
<li>
<p>Verify the CA certificate is the same as the one specified by operator:</p>
<pre><code class="language-command" data-lang="command">$ tail -n 22 /tmp/pod-cert-chain.pem &gt; /tmp/pod-cert-chain-ca.pem
$ openssl x509 -in @samples/certs/ca-cert.pem@ -text -noout &gt; /tmp/ca-cert.crt.txt
$ openssl x509 -in /tmp/pod-cert-chain-ca.pem -text -noout &gt; /tmp/pod-cert-chain-ca.crt.txt
$ diff /tmp/ca-cert.crt.txt /tmp/pod-cert-chain-ca.crt.txt
</code></pre><p>Expect the output to be empty.</p>
</li>
<li>
<p>Verify the certificate chain from the root certificate to the workload certificate:</p>
<pre><code class="language-command" data-lang="command">$ head -n 21 /tmp/pod-cert-chain.pem &gt; /tmp/pod-cert-chain-workload.pem
$ openssl verify -CAfile &lt;(cat @samples/certs/ca-cert.pem@ @samples/certs/root-cert.pem@) /tmp/pod-cert-chain-workload.pem
/tmp/pod-cert-chain-workload.pem: OK
</code></pre></li>
</ol>
<h2 id="cleanup">Cleanup</h2>
<ul>
<li>
<p>To remove the secret <code>cacerts</code>:</p>
<pre><code class="language-command" data-lang="command">$ kubectl delete secret cacerts -n istio-system
</code></pre></li>
<li>
<p>To remove the Istio components:</p>
<pre><code class="language-command" data-lang="command">$ kubectl delete -f @install/kubernetes/istio-auth.yaml@
</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>
<li>Read <a href="https://github.com/istio/istio/blob/release-0.8/security/samples/plugin_ca_certs">how the sample certificates and keys are generated</a>.</li>
</ul>
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