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<h1 id="title">Troubleshooting Guide</h1>
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<li><a href="#route-rules-have-no-effect-on-my-application">Route rules have no effect on my application</a></li>
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<li><a href="#verifying-connectivity-to-istio-pilot">Verifying connectivity to Istio Pilot</a></li>
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<li><a href="#no-traces-appearing-in-zipkin-when-running-istio-locally-on-mac">No traces appearing in Zipkin when running Istio locally on Mac</a></li>
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<li><a href="#envoy-wont-connect-to-my-http10-service">Envoy won't connect to my HTTP/1.0 service</a></li>
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<li><a href="#no-grafana-output-when-connecting-from-a-local-web-client-to-istio-remotely-hosted">No Grafana output when connecting from a local web client to Istio remotely hosted</a></li>
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<li><a href="#where-are-the-metrics-for-my-service">Where are the metrics for my service?</a>
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<ul>
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<li><a href="#verify-mixer-is-receiving-report-calls">Verify Mixer is receiving Report calls</a></li>
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<li><a href="#verify-mixer-metrics-configuration-exists">Verify Mixer metrics configuration exists</a></li>
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<li><a href="#verify-mixer-is-sending-metric-instances-to-the-prometheus-adapter">Verify Mixer is sending metric instances to the Prometheus adapter</a></li>
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<li><a href="#verify-prometheus-configuration">Verify Prometheus configuration</a></li>
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</ul>
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</li>
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<li><a href="#how-can-i-debug-issues-with-the-service-mesh">How can I debug issues with the service mesh?</a>
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<ul>
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<li><a href="#with-istioctl">With istioctl</a></li>
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<li><a href="#with-gdb">With GDB</a></li>
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<li><a href="#with-tcpdump">With Tcpdump</a></li>
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</ul>
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</li>
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<li><a href="#envoy-is-crashing-under-load">Envoy is crashing under load</a></li>
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<li><a href="#headless-tcp-services-losing-connection-from-istiofied-containers">Headless TCP services losing connection from Istiofied containers</a></li>
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<li><a href="#envoy-process-high-cpu-usage">Envoy Process High CPU Usage</a></li>
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<li><a href="#kubernetes-webhook-setup-script-files-are-missing-from-05-release-package">Kubernetes webhook setup script files are missing from 0.5 release package</a></li>
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<li><a href="#automatic-sidecar-injection-will-fail-if-the-kube-apiserver-has-proxy-settings">Automatic sidecar injection will fail if the kube-apiserver has proxy settings</a></li>
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</ul>
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</div>
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</nav>
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<p>Oh no! You're having trouble? Below is a list of solutions to common problems.</p>
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<h2 id="route-rules-have-no-effect-on-my-application">Route rules have no effect on my application</h2>
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<p>If route rules are working perfectly for the <a href="/v0.8/docs/guides/bookinfo/">Bookinfo</a> sample,
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but similar version routing rules have no effect on your own application, it may be that
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your Kubernetes services need to be changed slightly.</p>
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<p>Kubernetes services must adhere to certain restrictions in order to take advantage of
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Istio's L7 routing features.
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Refer to the <a href="/v0.8/docs/setup/kubernetes/sidecar-injection/#pod-spec-requirements">sidecar injection documentation</a>
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for details.</p>
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<h2 id="verifying-connectivity-to-istio-pilot">Verifying connectivity to Istio Pilot</h2>
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<p>Verifying connectivity to Pilot is a useful troubleshooting step. Every proxy container in the service mesh should be able to communicate with Pilot. This can be accomplished in a few simple steps:</p>
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<ol>
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<li>
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<p>Get the name of the Istio Ingress pod:</p>
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<pre><code class="language-command" data-lang="command">$ INGRESS_POD_NAME=$(kubectl get po -n istio-system | grep ingress\- | awk '{print$1}')
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</code></pre></li>
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<li>
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<p>Exec into the Istio Ingress pod:</p>
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<pre><code class="language-command" data-lang="command">$ kubectl exec -it $INGRESS_POD_NAME -n istio-system /bin/bash
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</code></pre></li>
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<li>
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<p>Test connectivity to Pilot using cURL. The following example cURL's the v1 registration API using default Pilot configuration parameters and mTLS enabled:</p>
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<pre><code class="language-command" data-lang="command">$ curl -k --cert /etc/certs/cert-chain.pem --cacert /etc/certs/root-cert.pem --key /etc/certs/key.pem https://istio-pilot:15003/v1/registration
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</code></pre><p>If mTLS is disabled:</p>
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<pre><code class="language-command" data-lang="command">$ curl http://istio-pilot:15003/v1/registration
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</code></pre></li>
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</ol>
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<p>You should receive a response listing the “service-key” and “hosts” for each service in the mesh.</p>
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<h2 id="no-traces-appearing-in-zipkin-when-running-istio-locally-on-mac">No traces appearing in Zipkin when running Istio locally on Mac</h2>
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<p>Istio is installed and everything seems to be working except there are no traces showing up in Zipkin when there
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should be.</p>
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<p>This may be caused by a known <a href="https://github.com/docker/for-mac/issues/1260">Docker issue</a> where the time inside
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containers may skew significantly from the time on the host machine. If this is the case,
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when you select a very long date range in Zipkin you will see the traces appearing as much as several days too early.</p>
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<p>You can also confirm this problem by comparing the date inside a docker container to outside:</p>
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<pre><code class="language-command" data-lang="command">$ docker run --entrypoint date gcr.io/istio-testing/ubuntu-16-04-slave:latest
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Sun Jun 11 11:44:18 UTC 2017
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</code></pre><pre><code class="language-command" data-lang="command">$ date -u
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Thu Jun 15 02:25:42 UTC 2017
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</code></pre><p>To fix the problem, you'll need to shutdown and then restart Docker before reinstalling Istio.</p>
|
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<h2 id="envoy-wont-connect-to-my-http10-service">Envoy won't connect to my HTTP/1.0 service</h2>
|
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<p>Envoy requires HTTP/1.1 or HTTP/2 traffic for upstream services. For example, when using <a href="https://www.nginx.com/">NGINX</a> for serving traffic behind Envoy, you
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will need to set the <a href="https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version">proxy_http_version</a> directive in your NGINX config to be “1.1”, since the NGINX default is 1.0</p>
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<p>Example config:</p>
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<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">upstream http_backend {
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server 127.0.0.1:8080;
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keepalive 16;
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}
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server {
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...
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location /http/ {
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proxy_pass http://http_backend;
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proxy_http_version 1.1;
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proxy_set_header Connection "";
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...
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}
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}
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</code></pre></div><h2 id="no-grafana-output-when-connecting-from-a-local-web-client-to-istio-remotely-hosted">No Grafana output when connecting from a local web client to Istio remotely hosted</h2>
|
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<p>Validate the client and server date and time match.</p>
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<p>The time of the web client (e.g. Chrome) affects the output from Grafana. A simple solution
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to this problem is to verify a time synchronization service is running correctly within the
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Kubernetes cluster and the web client machine also is correctly using a time synchronization
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service. Some common time synchronization systems are NTP and Chrony. This is especially
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problematic is engineering labs with firewalls. In these scenarios, NTP may not be configured
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properly to point at the lab-based NTP services.</p>
|
|
<h2 id="where-are-the-metrics-for-my-service">Where are the metrics for my service?</h2>
|
|
<p>The expected flow of metrics is:</p>
|
|
<ol>
|
|
<li>Envoy reports attributes to Mixer in batch (asynchronously from requests)</li>
|
|
<li>Mixer translates the attributes from Mixer into instances based on
|
|
operator-provided configuration.</li>
|
|
<li>The instances are handed to Mixer adapters for processing and backend storage.</li>
|
|
<li>The backend storage systems record metrics data.</li>
|
|
</ol>
|
|
<p>The default installations of Mixer ship with a <a href="https://prometheus.io/">Prometheus</a>
|
|
adapter, as well as configuration for generating a basic set of metric
|
|
values and sending them to the Prometheus adapter. The
|
|
<a href="/v0.8/docs/tasks/telemetry/querying-metrics/#about-the-prometheus-add-on">Prometheus add-on</a>
|
|
also supplies configuration for an instance of Prometheus to scrape
|
|
Mixer for metrics.</p>
|
|
<p>If you do not see the expected metrics in the Istio Dashboard and/or via
|
|
Prometheus queries, there may be an issue at any of the steps in the flow
|
|
listed above. Below is a set of instructions to troubleshoot each of
|
|
those steps.</p>
|
|
<h3 id="verify-mixer-is-receiving-report-calls">Verify Mixer is receiving Report calls</h3>
|
|
<p>Mixer generates metrics for monitoring the behavior of Mixer itself.
|
|
Check these metrics.</p>
|
|
<ol>
|
|
<li>
|
|
<p>Establish a connection to the Mixer self-monitoring endpoint.</p>
|
|
<p>In Kubernetes environments, execute the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl -n istio-system port-forward <mixer pod> 9093 &
|
|
</code></pre></li>
|
|
<li>
|
|
<p>Verify successful report calls.</p>
|
|
<p>On the <a href="http://localhost:9093/metrics">Mixer self-monitoring endpoint</a>,
|
|
search for <code>grpc_server_handled_total</code>.</p>
|
|
<p>You should see something like:</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">grpc_server_handled_total{grpc_code="OK",grpc_method="Report",grpc_service="istio.mixer.v1.Mixer",grpc_type="unary"} 68
|
|
</code></pre></div></li>
|
|
</ol>
|
|
<p>If you do not see any data for <code>grpc_server_handled_total</code> with a
|
|
<code>grpc_method="Report"</code>, then Mixer is not being called by Envoy to report
|
|
telemetry. In this case, ensure that the services have been properly
|
|
integrated into the mesh (either by via
|
|
<a href="/v0.8/docs/setup/kubernetes/sidecar-injection/#automatic-sidecar-injection">automatic</a>
|
|
or <a href="/v0.8/docs/setup/kubernetes/sidecar-injection/#manual-sidecar-injection">manual</a> sidecar injection).</p>
|
|
<h3 id="verify-mixer-metrics-configuration-exists">Verify Mixer metrics configuration exists</h3>
|
|
<ol>
|
|
<li>
|
|
<p>Verify Mixer rules exist.</p>
|
|
<p>In Kubernetes environments, issue the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl get rules --all-namespaces
|
|
NAMESPACE NAME KIND
|
|
istio-system promhttp rule.v1alpha2.config.istio.io
|
|
istio-system promtcp rule.v1alpha2.config.istio.io
|
|
istio-system stdio rule.v1alpha2.config.istio.io
|
|
</code></pre><p>If you do not see anything named <code>promhttp</code> or <code>promtcp</code>, then there is
|
|
no Mixer configuration for sending metric instances to a Prometheus adapter.
|
|
You will need to supply configuration for rules that connect Mixer metric
|
|
instances to a Prometheus handler.</p>
|
|
</li>
|
|
</ol>
|
|
<!-- raw HTML omitted -->
|
|
<ol>
|
|
<li>
|
|
<p>Verify Prometheus handler config exists.</p>
|
|
<p>In Kubernetes environments, issue the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl get prometheuses.config.istio.io --all-namespaces
|
|
NAMESPACE NAME KIND
|
|
istio-system handler prometheus.v1alpha2.config.istio.io
|
|
</code></pre><p>If there are no prometheus handlers configured, you will need to reconfigure
|
|
Mixer with the appropriate handler configuration.</p>
|
|
</li>
|
|
</ol>
|
|
<!-- raw HTML omitted -->
|
|
<ol>
|
|
<li>
|
|
<p>Verify Mixer metric instances config exists.</p>
|
|
<p>In Kubernetes environments, issue the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl get metrics.config.istio.io --all-namespaces
|
|
NAMESPACE NAME KIND
|
|
istio-system requestcount metric.v1alpha2.config.istio.io
|
|
istio-system requestduration metric.v1alpha2.config.istio.io
|
|
istio-system requestsize metric.v1alpha2.config.istio.io
|
|
istio-system responsesize metric.v1alpha2.config.istio.io
|
|
istio-system stackdriverrequestcount metric.v1alpha2.config.istio.io
|
|
istio-system stackdriverrequestduration metric.v1alpha2.config.istio.io
|
|
istio-system stackdriverrequestsize metric.v1alpha2.config.istio.io
|
|
istio-system stackdriverresponsesize metric.v1alpha2.config.istio.io
|
|
istio-system tcpbytereceived metric.v1alpha2.config.istio.io
|
|
istio-system tcpbytesent metric.v1alpha2.config.istio.io
|
|
</code></pre><p>If there are no metric instances configured, you will need to reconfigure
|
|
Mixer with the appropriate instance configuration.</p>
|
|
</li>
|
|
</ol>
|
|
<!-- raw HTML omitted -->
|
|
<ol>
|
|
<li>
|
|
<p>Verify Mixer configuration resolution is working for your service.</p>
|
|
<ol>
|
|
<li>
|
|
<p>Establish a connection to the Mixer self-monitoring endpoint.</p>
|
|
<p>Setup a <code>port-forward</code> to the Mixer self-monitoring port as described in
|
|
<a href="#verify-mixer-is-receiving-report-calls">Verify Mixer is receiving Report calls</a>.</p>
|
|
</li>
|
|
<li>
|
|
<p>On the <a href="http://localhost:9093/metrics">Mixer self-monitoring port</a>, search
|
|
for <code>mixer_config_resolve_count</code>.</p>
|
|
<p>You should find something like:</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">mixer_config_resolve_count{error="false",target="details.default.svc.cluster.local"} 56
|
|
mixer_config_resolve_count{error="false",target="ingress.istio-system.svc.cluster.local"} 67
|
|
mixer_config_resolve_count{error="false",target="mongodb.default.svc.cluster.local"} 18
|
|
mixer_config_resolve_count{error="false",target="productpage.default.svc.cluster.local"} 59
|
|
mixer_config_resolve_count{error="false",target="ratings.default.svc.cluster.local"} 26
|
|
mixer_config_resolve_count{error="false",target="reviews.default.svc.cluster.local"} 54
|
|
</code></pre></div></li>
|
|
<li>
|
|
<p>Validate that there are values for <code>mixer_config_resolve_count</code> where
|
|
<code>target="<your service>"</code> and <code>error="false"</code>.</p>
|
|
<p>If there are only instances where <code>error="true"</code> where <code>target=<your service></code>,
|
|
there is likely an issue with Mixer configuration for your service. Logs
|
|
information is needed to further debug.</p>
|
|
<p>In Kubernetes environments, retrieve the Mixer logs via:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl -n istio-system logs <mixer pod> mixer
|
|
</code></pre><p>Look for errors related to your configuration or your service in the
|
|
returned logs.</p>
|
|
</li>
|
|
</ol>
|
|
</li>
|
|
</ol>
|
|
<p>More on viewing Mixer configuration can be found <a href="/v0.8/help/faq/mixer/#mixer-self-monitoring">here</a></p>
|
|
<h3 id="verify-mixer-is-sending-metric-instances-to-the-prometheus-adapter">Verify Mixer is sending metric instances to the Prometheus adapter</h3>
|
|
<ol>
|
|
<li>
|
|
<p>Establish a connection to the Mixer self-monitoring endpoint.</p>
|
|
<p>Setup a <code>port-forward</code> to the Mixer self-monitoring port as described in
|
|
<a href="#verify-mixer-is-receiving-report-calls">Verify Mixer is receiving Report calls</a>.</p>
|
|
</li>
|
|
<li>
|
|
<p>On the <a href="http://localhost:9093/metrics">Mixer self-monitoring port</a>, search
|
|
for <code>mixer_adapter_dispatch_count</code>.</p>
|
|
<p>You should find something like:</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">mixer_adapter_dispatch_count{adapter="prometheus",error="false",handler="handler.prometheus.istio-system",meshFunction="metric",response_code="OK"} 114
|
|
mixer_adapter_dispatch_count{adapter="prometheus",error="true",handler="handler.prometheus.default",meshFunction="metric",response_code="INTERNAL"} 4
|
|
mixer_adapter_dispatch_count{adapter="stdio",error="false",handler="handler.stdio.istio-system",meshFunction="logentry",response_code="OK"} 104
|
|
</code></pre></div></li>
|
|
<li>
|
|
<p>Validate that there are values for <code>mixer_adapter_dispatch_count</code> where
|
|
<code>adapter="prometheus"</code> and <code>error="false"</code>.</p>
|
|
<p>If there are are no recorded dispatches to the Prometheus adapter, there
|
|
is likely a configuration issue. Please see
|
|
<a href="#verify-mixer-metrics-configuration-exists">Verify Mixer metrics configuration exists</a>.</p>
|
|
<p>If dispatches to the Prometheus adapter are reporting errors, check the
|
|
Mixer logs to determine the source of the error. Most likely, there is a
|
|
configuration issue for the handler listed in <code>mixer_adapter_dispatch_count</code>.</p>
|
|
<p>In Kubernetes environment, check the Mixer logs via:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl -n istio-system logs <mixer pod> mixer
|
|
</code></pre><p>Filter for lines including something like <code>Report 0 returned with: INTERNAL (1 error occurred:</code> (with some surrounding context) to find more information
|
|
regarding Report dispatch failures.</p>
|
|
</li>
|
|
</ol>
|
|
<h3 id="verify-prometheus-configuration">Verify Prometheus configuration</h3>
|
|
<ol>
|
|
<li>
|
|
<p>Connect to the Prometheus UI and verify that it can successfully
|
|
scrape Mixer.</p>
|
|
<p>In Kubernetes environments, setup port-forwarding as follows:</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=prometheus -o jsonpath='{.items[0].metadata.name}') 9090:9090 &
|
|
</code></pre></li>
|
|
<li>
|
|
<p>Visit <a href="http://localhost:9090/targets">http://localhost:9090/targets</a> and confirm that the target <code>istio-mesh</code> has a status of <strong>UP</strong>.</p>
|
|
</li>
|
|
<li>
|
|
<p>Visit <a href="http://localhost:9090/config">http://localhost:9090/config</a> and confirm that an entry exists that looks like:</p>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"> - job_name: <span style="color:#e6db74">'istio-mesh'</span>
|
|
<span style="color:#75715e"># Override the global default and scrape targets from this job every 5 seconds.</span>
|
|
scrape_interval: 5s
|
|
<span style="color:#75715e"># metrics_path defaults to '/metrics'</span>
|
|
<span style="color:#75715e"># scheme defaults to 'http'.</span>
|
|
static_configs:
|
|
- targets: [<span style="color:#e6db74">'istio-mixer.istio-system:42422'</span>]
|
|
</code></pre></div></li>
|
|
</ol>
|
|
<h2 id="how-can-i-debug-issues-with-the-service-mesh">How can I debug issues with the service mesh?</h2>
|
|
<h3 id="with-istioctl">With istioctl</h3>
|
|
<p>Istioctl allows you to inspect the current xDS of a given Envoy from its admin interface (locally) or from Pilot using the <code>proxy-config</code> or <code>pc</code> command.</p>
|
|
<p>For example, to retrieve the configured clusters in an Envoy via the admin interface run the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ istioctl proxy-config endpoint <pod-name> clusters
|
|
</code></pre><p>To retrieve endpoints for a given pod in the application namespace from Pilot run the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ istioctl proxy-config pilot -n application <pod-name> eds
|
|
</code></pre><p>The <code>proxy-config</code> command also allows you to retrieve the state of the entire mesh from Pilot using the following command:</p>
|
|
<pre><code class="language-command" data-lang="command">$ istioctl proxy-config pilot mesh ads
|
|
</code></pre><h3 id="with-gdb">With GDB</h3>
|
|
<p>To debug Istio with <code>gdb</code>, you will need to run the debug images of Envoy / Mixer / Pilot. A recent <code>gdb</code> and the golang extensions (for Mixer/Pilot or other golang components) is required.</p>
|
|
<ol>
|
|
<li>
|
|
<p><code>kubectl exec -it PODNAME -c [proxy | mixer | pilot]</code></p>
|
|
</li>
|
|
<li>
|
|
<p>Find process ID: ps ax</p>
|
|
</li>
|
|
<li>
|
|
<p>gdb -p PID binary</p>
|
|
</li>
|
|
<li>
|
|
<p>For go: info goroutines, goroutine x bt</p>
|
|
</li>
|
|
</ol>
|
|
<h3 id="with-tcpdump">With Tcpdump</h3>
|
|
<p>Tcpdump doesn't work in the sidecar pod - the container doesn't run as root. However any other container in the same pod will see all the packets, since the network namespace is shared. <code>iptables</code> will also see the pod-wide config.</p>
|
|
<p>Communication between Envoy and the app happens on 127.0.0.1, and is not encrypted.</p>
|
|
<h2 id="envoy-is-crashing-under-load">Envoy is crashing under load</h2>
|
|
<p>Check your <code>ulimit -a</code>. Many systems have a 1024 open file descriptor limit by default which will cause Envoy to assert and crash with:</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">[2017-05-17 03:00:52.735][14236][critical][assert] assert failure: fd_ != -1: external/envoy/source/common/network/connection_impl.cc:58
|
|
</code></pre></div><p>Make sure to raise your ulimit. Example: <code>ulimit -n 16384</code></p>
|
|
<h2 id="headless-tcp-services-losing-connection-from-istiofied-containers">Headless TCP services losing connection from Istiofied containers</h2>
|
|
<p>If <code>istio-citadel</code> is deployed, Envoy is restarted every 15 minutes to refresh certificates.
|
|
This causes the disconnection of TCP streams or long-running connections between services.</p>
|
|
<p>You should build resilience into your application for this type of
|
|
disconnect, but if you still want to prevent the disconnects from
|
|
happening, you will need to disable mTLS and the <code>istio-citadel</code> deployment.</p>
|
|
<p>First, edit your istio config to disable mTLS</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl edit configmap -n istio-system istio
|
|
$ kubectl delete pods -n istio-system -l istio=pilot
|
|
</code></pre><p>Next, scale down the <code>istio-citadel</code> deployment to disable Envoy restarts.</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl scale --replicas=0 deploy/istio-citadel -n istio-system
|
|
</code></pre><p>This should stop Istio from restarting Envoy and disconnecting TCP connections.</p>
|
|
<h2 id="envoy-process-high-cpu-usage">Envoy Process High CPU Usage</h2>
|
|
<p>For larger clusters, the default configuration that comes with Istio
|
|
refreshes the Envoy configuration every 1 second. This can cause high
|
|
CPU usage, even when Envoy isn't doing anything. In order to bring the
|
|
CPU usage down for larger deployments, increase the refresh interval for
|
|
Envoy to something higher, like 30 seconds.</p>
|
|
<pre><code class="language-command" data-lang="command">$ kubectl edit configmap -n istio-system istio
|
|
$ kubectl delete pods -n istio-system -l istio=pilot
|
|
</code></pre><p>Also make sure to reinject the sidecar into all of your pods, as
|
|
their configuration needs to be updated as well.</p>
|
|
<p>Afterwards, you should see CPU usage fall back to 0-1% while idling.
|
|
Make sure to tune these values for your specific deployment.</p>
|
|
<p><em>Warning:</em>: Changes created by routing rules will take up to 2x refresh interval to propagate to the sidecars.
|
|
While the larger refresh interval will reduce CPU usage, updates caused by routing rules may cause a period
|
|
of HTTP 404s (up to 2x the refresh interval) until the Envoy sidecars get all relevant configuration.</p>
|
|
<h2 id="kubernetes-webhook-setup-script-files-are-missing-from-05-release-package">Kubernetes webhook setup script files are missing from 0.5 release package</h2>
|
|
<blockquote>
|
|
<p>The 0.5.0 and 0.5.1 releases are missing scripts to provision webhook certificates. Download the missing files
|
|
from <a href="https://raw.githubusercontent.com/istio/istio/release-0.7/install/kubernetes/webhook-create-signed-cert.sh">here</a> and <a href="https://raw.githubusercontent.com/istio/istio/release-0.7/install/kubernetes/webhook-patch-ca-bundle.sh">here</a>. Subsequent releases (> 0.5.1) include these files.</p>
|
|
</blockquote>
|
|
<h2 id="automatic-sidecar-injection-will-fail-if-the-kube-apiserver-has-proxy-settings">Automatic sidecar injection will fail if the kube-apiserver has proxy settings</h2>
|
|
<p>This was tested on 0.5.0 with the additional files required as referenced in the above issue. When the Kube-apiserver included
|
|
proxy settings such as:</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-yaml" data-lang="yaml">env:
|
|
- name: http_proxy
|
|
value: http://proxy-wsa.esl.foo.com:<span style="color:#ae81ff">80</span>
|
|
- name: https_proxy
|
|
value: http://proxy-wsa.esl.foo.com:<span style="color:#ae81ff">80</span>
|
|
- name: no_proxy
|
|
value: <span style="color:#ae81ff">127.0</span><span style="color:#ae81ff">.0</span><span style="color:#ae81ff">.1</span>,localhost,dockerhub.foo.com,devhub-docker.foo.com,<span style="color:#ae81ff">10.84</span><span style="color:#ae81ff">.100</span><span style="color:#ae81ff">.125</span>,<span style="color:#ae81ff">10.84</span><span style="color:#ae81ff">.100</span><span style="color:#ae81ff">.126</span>,<span style="color:#ae81ff">10.84</span><span style="color:#ae81ff">.100</span><span style="color:#ae81ff">.127</span>
|
|
</code></pre></div><p>The sidecar injection would fail. The only related failure logs was in the kube-apiserver log:</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">W0227 21:51:03.156818 1 admission.go:257] Failed calling webhook, failing open sidecar-injector.istio.io: failed calling admission webhook "sidecar-injector.istio.io": Post https://istio-sidecar-injector.istio-system.svc:443/inject: Service Unavailable
|
|
</code></pre></div><p>Make sure both pod and service CIDRs are not proxied according to *_proxy variables. Check the kube-apiserver files and logs to verify the configuration and whether any requests are being proxied.</p>
|
|
<p>A workaround is to remove the proxy settings from the kube-apiserver manifest and restart the server or use a later version of kubernetes.</p>
|
|
<p>An issue was filed in kubernetes related to this and has since been closed. <a href="https://github.com/kubernetes/kubeadm/issues/666">https://github.com/kubernetes/kubeadm/issues/666</a>
|
|
<a href="https://github.com/kubernetes/kubernetes/pull/58698#discussion_r163879443">https://github.com/kubernetes/kubernetes/pull/58698#discussion_r163879443</a></p>
|
|
|
|
|
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<h2>Links</h2>
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