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installations." href=/v1.0/help/ops/setup/>Installation and Setup</a></label><ul class=tree><li><a title="Provides a general overview of Istio's use of Kubernetes webhooks and the related issues that can arise." href=/v1.0/help/ops/setup/webhook/>Dynamic Admission Webhooks Overview</a></li><li><span class=current title="Describes Istio's use of Kubernetes webhooks for server-side configuration validation.">Configuration Validation Webhook</span></li><li><a title="Describes Istio's use of Kubernetes webhooks for automatic sidecar injection." href=/v1.0/help/ops/setup/injection/>Sidecar Injection Webhook</a></li></ul></li><li><a title="Advice on tackling common problems with Istio." href=/v1.0/help/ops/misc/>Miscellaneous</a></li></ul></li><li class=sublist><label class=tree-toggle><i class="fa fa-lg fa-caret-right"></i><a title="Frequently Asked Questions about Istio." href=/v1.0/help/faq/>FAQ</a></label><ul class="tree collapse"><li><a title="General Q & A." href=/v1.0/help/faq/general/>General</a></li><li><a title="Setup Q & A." href=/v1.0/help/faq/setup/>Setup</a></li><li><a title="Security Q & A." href=/v1.0/help/faq/security/>Security</a></li><li><a title="Mixer Q & A." href=/v1.0/help/faq/mixer/>Mixer</a></li><li><a title="Telemetry Q & A." href=/v1.0/help/faq/telemetry/>Telemetry</a></li><li><a title="Traffic Management Q & A." href=/v1.0/help/faq/traffic-management/>Traffic Management</a></li></ul></li><li><a title="A glossary of common Istio terms." href=/v1.0/help/glossary/>Glossary</a></li></ul></div></div></div></div></nav></div><div class="col-12 col-md-9 col-xl-8"><p class=d-md-none><label class=sidebar-toggler data-toggle=offcanvas><i class="fa fa-sign-out-alt"></i></label></p><main aria-labelledby=title><div class=pagenav><p><a href=/v1.0/help/ops/setup/ title="Helps you diagnose and repair Istio installations."><i style=transform:scaleX(-1) class="fa fa-level-up-alt"></i>&nbsp;Installation and Setup</a></p></div><h1 id=title>Configuration Validation Webhook</h1><nav class="toc-inlined d-xl-none d-print-none"><hr><div class=directory role=directory><nav id=InlinedTableOfContents><ul><li><a href=#seemingly-valid-configuration-is-rejected>Seemingly valid configuration is rejected</a></li><li><a href=#invalid-configuration-is-accepted>Invalid configuration is accepted</a></li><li><a href=#creating-configuration-fails-with-x509-certificate-errors>Creating configuration fails with x509 certificate errors</a></li><li><a href=#creating-configuration-fails-with-no-such-hosts-or-no-endpoints-available-errors>Creating configuration fails with <code>no such hosts</code> or <code>no endpoints available</code> errors</a></li></ul></nav></div><hr></nav><p>Galleys configuration validation ensures user authored Istio
configuration is syntactically and semantically valid. It uses a
Kubernetes <code>ValidatingWebhook</code>. The <code>istio-galley</code>
<code>ValidationWebhookConfiguration</code> has two webhooks.</p><ul><li><p><code>pilot.validation.istio.io</code> - Served on path <code>/admitpilot</code> and is
responsible for validating configuration consumed by Pilot
(e.g. VirtualService, Authentication).</p></li><li><p><code>mixer.validation.istio.io</code> - Served on path <code>/admitmixer</code> and is
responsible for validating configuration consumed by Mixer.</p></li></ul><p>Both webhooks are implemented by the <code>istio-galley</code> service on
port 443. Each webhook has its own <code>clientConfig</code>, <code>namespaceSelector</code>,
and <code>rules</code> section. Both webhooks are scoped to all namespaces. The
<code>namespaceSelector</code> should be empty. Both rules apply to Istio Custom
Resource Definitions (CRDs).</p><h2 id=seemingly-valid-configuration-is-rejected>Seemingly valid configuration is rejected</h2><p>Manually verify your configuration is correct, cross-referencing
<a href=https://istio.io/docs/reference/config>Istio API reference</a> when
necessary.</p><h2 id=invalid-configuration-is-accepted>Invalid configuration is accepted</h2><p>Verify the <code>istio-galley</code> <code>validationwebhookconfiguration</code> exists and
is correct. The <code>apiVersion</code>, <code>apiGroup</code>, and <code>resource</code> of the
invalid configuration should be listed in one of the two <code>webhooks</code>
entries.</p><pre><code class=language-command-output-as-yaml>$ kubectl get validatingwebhookconfiguration istio-galley -o yaml
apiVersion: admissionregistration.k8s.io/v1beta1
kind: ValidatingWebhookConfiguration
metadata:
labels:
app: istio-galley
name: istio-galley
ownerReferences:
- apiVersion: extensions/v1beta1
blockOwnerDeletion: true
controller: true
kind: Deployment
name: istio-galley
uid: 5c64585d-91c6-11e8-a98a-42010a8001a8
webhooks:
- clientConfig:
# caBundle should be non-empty. This is periodically (re)patched
# every second by the webhook service using the ca-cert
# from the mounted service account secret.
caBundle: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUM1VENDQWMyZ0F3SUJBZ0lRVzVYNWpJcnJCemJmZFdLaWVoaVVSakFOQmdrcWhraUc5dzBCQVFzRkFEQWMKTVJvd0dBWURWUVFLRXhGck9ITXVZMngxYzNSbGNpNXNiMk5oYkRBZUZ3MHhPREEzTWpjeE56VTJNakJhRncweApPVEEzTWpjeE56VTJNakJhTUJ3eEdqQVlCZ05WQkFvVEVXczRjeTVqYkhWemRHVnlMbXh2WTJGc01JSUJJakFOCkJna3Foa2lHOXcwQkFRRUZBQU9DQVE4QU1JSUJDZ0tDQVFFQXdVMi9SdWlyeTNnUzdPd2xJRCtaaGZiOEpOWnMKK05OL0dRWUsxbVozb3duaEw4dnJHdDBhenpjNXFuOXo2ZEw5Z1pPVFJXeFVCYXVJMUpOa3d0dSt2NmRjRzlkWgp0Q2JaQWloc1BLQWQ4MVRaa3RwYkNnOFdrcTRyNTh3QldRemNxMldsaFlPWHNlWGtRejdCbStOSUoyT0NRbmJwCjZYMmJ4Slc2OGdaZkg2UHlNR0libXJxaDgvZ2hISjFha3ptNGgzc0VGU1dTQ1Y2anZTZHVJL29NM2pBem5uZlUKU3JKY3VpQnBKZmJSMm1nQm4xVmFzNUJNdFpaaTBubDYxUzhyZ1ZiaHp4bWhpeFhlWU0zQzNHT3FlRUthY0N3WQo0TVczdEJFZ3NoN2ovZGM5cEt1ZG1wdFBFdit2Y2JnWjdreEhhazlOdFV2YmRGempJeTMxUS9Qd1NRSURBUUFCCm95TXdJVEFPQmdOVkhROEJBZjhFQkFNQ0FnUXdEd1lEVlIwVEFRSC9CQVV3QXdFQi96QU5CZ2txaGtpRzl3MEIKQVFzRkFBT0NBUUVBTnRLSnVkQ3NtbTFzU3dlS2xKTzBIY1ZMQUFhbFk4ZERUYWVLNksyakIwRnl0MkM3ZUtGSAoya3JaOWlkbWp5Yk8xS0djMVlWQndNeWlUMGhjYWFlaTdad2g0aERRWjVRN0k3ZFFuTVMzc2taR3ByaW5idU1aCmg3Tm1WUkVnV1ZIcm9OcGZEN3pBNEVqWk9FZzkwR0J6YXUzdHNmanI4RDQ1VVRJZUw3M3hwaUxmMXhRTk10RWEKd0NSelplQ3lmSUhra2ZrTCtISVVGK0lWV1g2VWp2WTRpRDdRR0JCenpHZTluNS9KM1g5OU1Gb1F3bExjNHMrTQpnLzNQdnZCYjBwaTU5MWxveXluU3lkWDVqUG5ibDhkNEFJaGZ6OU8rUTE5UGVULy9ydXFRNENOancrZmVIbTBSCjJzYmowZDd0SjkyTzgwT2NMVDlpb05NQlFLQlk3cGlOUkE9PQotLS0tLUVORCBDRVJUSUZJQ0FURS0tLS0tCg==
service:
# service corresponds to the Kubernetes service that implements the
# webhook, e.g. istio-galley.istio-system.svc:443
name: istio-galley
namespace: istio-system
path: /admitpilot
failurePolicy: Fail
name: pilot.validation.istio.io
namespaceSelector: {}
rules:
- apiGroups:
- config.istio.io
apiVersions:
- v1alpha2
operations:
- CREATE
- UPDATE
resources:
- httpapispecs
- httpapispecbindings
- quotaspecs
- quotaspecbindings
- apiGroups:
- rbac.istio.io
apiVersions:
- &#39;*&#39;
operations:
- CREATE
- UPDATE
resources:
- &#39;*&#39;
- apiGroups:
- authentication.istio.io
apiVersions:
- &#39;*&#39;
operations:
- CREATE
- UPDATE
resources:
- &#39;*&#39;
- apiGroups:
- networking.istio.io
apiVersions:
- &#39;*&#39;
operations:
- CREATE
- UPDATE
resources:
- destinationrules
- envoyfilters
- gateways
- virtualservices
- clientConfig:
# caBundle should be non-empty. This is periodically (re)patched
# every second by the webhook service using the ca-cert
# from the mounted service account secret.
caBundle: 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
service:
# service corresponds to the Kubernetes service that implements the
# webhook, e.g. istio-galley.istio-system.svc:443
name: istio-galley
namespace: istio-system
path: /admitmixer
failurePolicy: Fail
name: mixer.validation.istio.io
namespaceSelector: {}
rules:
- apiGroups:
- config.istio.io
apiVersions:
- v1alpha2
operations:
- CREATE
- UPDATE
resources:
- rules
- attributemanifests
- circonuses
- deniers
- fluentds
- kubernetesenvs
- listcheckers
- memquotas
- noops
- opas
- prometheuses
- rbacs
- servicecontrols
- solarwindses
- stackdrivers
- statsds
- stdios
- apikeys
- authorizations
- checknothings
- listentries
- logentries
- metrics
- quotas
- reportnothings
- servicecontrolreports
- tracespans</code></pre><p>If the <code>validatingwebhookconfiguration</code> doesnt exist, verify the
<code>istio-galley-configuration</code> <code>configmap</code> exists. <code>istio-galley</code> uses
the data from this configmap to create and update the
<code>validatingwebhookconfiguration</code>.</p><pre><code class=language-command-output-as-yaml>$ kubectl -n istio-system get configmap istio-galley-configuration -o jsonpath=&#39;{.data}&#39;
map[validatingwebhookconfiguration.yaml:apiVersion: admissionregistration.k8s.io/v1beta1
kind: ValidatingWebhookConfiguration
metadata:
name: istio-galley
namespace: istio-system
labels:
app: istio-galley
chart: galley-1.0.0
release: istio
heritage: Tiller
webhooks:
- name: pilot.validation.istio.io
clientConfig:
service:
name: istio-galley
namespace: istio-system
path: &#34;/admitpilot&#34;
caBundle: &#34;&#34;
rules:
- operations:
(... snip ...)</code></pre><p>If the webhook array in <code>istio-galley-configuration</code> is empty and
you're using <code>helm template</code> or <code>helm install</code>, verify <code>--set galley.enabled</code> and <code>--set global.configValidation=true</code> options are
set. If you're not using helm, you'll need to find a generate
YAML that includes the populated webhook array.</p><p>The <code>istio-galley</code> validation configuration is fail-close. If
configuration exists and is scoped properly, the webhook will be
invoked. A missing <code>caBundle</code>, bad certificate, or network connectivity
problem will produce an error message when the resource is
created/updated. If you dont see any error message and the webhook
wasnt invoked and the webhook configuration is valid, your cluster is
misconfigured.</p><h2 id=creating-configuration-fails-with-x509-certificate-errors>Creating configuration fails with x509 certificate errors</h2><p><code>x509: certificate signed by unknown authority</code> related errors are
typically caused by an empty <code>caBundle</code> in the webhook
configuration. Verify that it is not empty (see <a href=#invalid-configuration-is-accepted>verify webhook
configuration</a>). The
<code>istio-galley</code> deployment consciously reconciles webhook configuration
used the <code>istio-galley-configuration</code> <code>configmap</code> and root certificate
mounted from <code>istio.istio-galley-service-account</code> secret in the
<code>istio-system</code> namespace.</p><ol><li><p>Verify the <code>istio-galley</code> pods(s) are running:</p><pre><code class=language-command>$ kubectl -n istio-system get pod -listio=galley
NAME READY STATUS RESTARTS AGE
istio-galley-5dbbbdb746-d676g 1/1 Running 0 2d</code></pre></li><li><p>Verify youre using Istio version >= 1.0.0. Older version of Galley
did not properly re-patch the <code>caBundle</code>. This typically happened
when the <code>istio.yaml</code> was re-applied, overwriting a previously
patched <code>caBundle</code>.</p><pre><code class=language-command>$ for pod in $(kubectl -n istio-system get pod -listio=galley -o jsonpath=&#39;{.items[*].metadata.name}&#39;); do \
kubectl -n istio-system exec ${pod} -it /usr/local/bin/galley version| grep ^Version; \
done
Version: 1.0.0</code></pre></li><li><p>Check the Galley pod logs for errors. Failing to patch the
<code>caBundle</code> should print an error.</p><pre><code class=language-command>$ for pod in $(kubectl -n istio-system get pod -listio=galley -o jsonpath=&#39;{.items[*].metadata.name}&#39;); do \
kubectl -n istio-system logs ${pod} \
done</code></pre></li><li><p>If the patching failed, verify the RBAC configuration for Galley:</p><pre><code class=language-command-output-as-yaml>$ kubectl get clusterrole istio-galley-istio-system -o yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
app: istio-galley
name: istio-galley-istio-system
rules:
- apiGroups:
- admissionregistration.k8s.io
resources:
- validatingwebhookconfigurations
verbs:
- &#39;*&#39;
- apiGroups:
- config.istio.io
resources:
- &#39;*&#39;
verbs:
- get
- list
- watch
- apiGroups:
- &#39;*&#39;
resourceNames:
- istio-galley
resources:
- deployments
verbs:
- get</code></pre><p><code>istio-galley</code> needs <code>validatingwebhookconfigurations</code> write access to
create and update the <code>istio-galley</code> <code>validatingwebhookconfiguration</code>.</p></li></ol><h2 id=creating-configuration-fails-with-no-such-hosts-or-no-endpoints-available-errors>Creating configuration fails with <code>no such hosts</code> or <code>no endpoints available</code> errors</h2><p>Validation is fail-close. If the <code>istio-galley</code> pod is not ready,
configuration cannot be created and updated. In such cases youll see
an error about <code>no such host</code> (Kubernetes 1.9) or <code>no endpoints available</code> (>=1.10).</p><p>Verify the <code>istio-galley</code> pods(s) are running and endpoints are ready.</p><pre><code class=language-command>$ kubectl -n istio-system get pod -listio=galley
NAME READY STATUS RESTARTS AGE
istio-galley-5dbbbdb746-d676g 1/1 Running 0 2d</code></pre><pre><code class=language-command>$ kubectl -n istio-system get endpoints istio-galley
NAME ENDPOINTS AGE
istio-galley 10.48.6.108:9093,10.48.6.108:443 3d</code></pre><p>If the pods or endpoints aren't ready, check the pod logs and
status for any indication about why the webhook pod is failing to start
and serve traffic.</p><pre><code class=language-command>$ for pod in $(kubectl -n istio-system get pod -listio=galley -o jsonpath=&#39;{.items[*].metadata.name}&#39;); do \
kubectl -n istio-system logs ${pod} \
done</code></pre><pre><code class=language-command>$ for pod in $(kubectl -n istio-system get pod -listio=galley -o name); do \
kubectl -n istio-system describe ${pod} \
done</code></pre></main><div class="container-fluid d-print-none"><br><div class=row><div class="col-6 pagenav"><p><a title="Provides a general overview of Istio's use of Kubernetes webhooks and the related issues that can arise." href=/v1.0/help/ops/setup/webhook/><i class="fa fa-long-arrow-alt-left"></i>Dynamic Admission Webhooks Overview</a></p></div><div class="col-6 pagenav" style=text-align:right><p><a title="Describes Istio's use of Kubernetes webhooks for automatic sidecar injection." href=/v1.0/help/ops/setup/injection/>Sidecar Injection Webhook
<i class="fa fa-long-arrow-alt-right"></i></a></p></div></div></div><div class="d-none d-print-block" aria-hidden=true><h2>Links</h2><ol id=endnotes></ol></div></div><div class="col-12 col-md-2 d-none d-xl-block d-print-none"><nav class=toc><div class=spacer></div><div id=toc class=directory role=directory><nav id=TableOfContents><ul><li><a href=#seemingly-valid-configuration-is-rejected>Seemingly valid configuration is rejected</a></li><li><a href=#invalid-configuration-is-accepted>Invalid configuration is accepted</a></li><li><a href=#creating-configuration-fails-with-x509-certificate-errors>Creating configuration fails with x509 certificate errors</a></li><li><a href=#creating-configuration-fails-with-no-such-hosts-or-no-endpoints-available-errors>Creating configuration fails with <code>no such hosts</code> or <code>no endpoints available</code> errors</a></li></ul></nav></div></nav></div></div></div><footer class="d-print-none container-fluid"><div class=row><div class="col-5 col-lg-4" role=navigation><div class=container-fluid><div class=row><div class=icon><span>discuss</span>
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