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[serverless-docs-1.32] [SRVKS-1220] Readiness and liveness probing on a multi-container service #78346

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Jul 1, 2024
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[serverless-docs-1.32] [SRVKS-1220] Readiness and liveness probing on a multi-container service #78346

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3 changes: 3 additions & 0 deletions knative-serving/config-applications/multi-container-support-for-serving.adoc
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Expand Up @@ -8,3 +8,6 @@ You can deploy a multi-container pod by using a single Knative service. This met

// Multi-container support
include::modules/serverless-configuring-multi-container-service.adoc[leveloffset=+1]

// Probing a multi-container service
include::modules/serverless-probing-multi-container-service.adoc[leveloffset=+1]
67 changes: 67 additions & 0 deletions modules/serverless-probing-multi-container-service.adoc
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// Module included in the following assemblies:
//
// * serverless/knative-serving/config-applications/multi-container-support-for-serving.adoc


:_content-type: PROCEDURE
[id="serverless-probing-multi-container-service_{context}"]
= Probing a multi-container service


You can specify readiness and liveness probes for multiple containers. This feature is not enabled by default and you must configure it using the `KnativeServing` custom resource (CR).


.Procedure


. Configure multi-container probing for your service by enabling the `multi-container-probing` feature in the `KnativeServing` CR.
+
.Multi-container probing configuration
[source,yaml]
----
...
spec:
config:
features:
"multi-container-probing": enabled <1>
...
----
<1> Enabled multi-container-probing feature

. Apply the updated `KnativeServing` CR.
+
[source,terminal]
----
$ oc apply -f <filename>
----
. Modify your multi-container service to include the specified probes.
+
.Multi-container probing
[source,yaml]
----
apiVersion: serving.knative.dev/v1
kind: Service
...
spec:
template:
spec:
containers:
- name: first-container
image: ghcr.io/knative/helloworld-go:latest
ports:
- containerPort: 8080
readinessProbe: <1>
httpGet:
port: 8080
- name: second-container
image: gcr.io/knative-samples/helloworld-java
readinessProbe: <2>
httpGet:
port: 8090
----
<1> Readiness probe of the first container
<2> Readiness probe of the second container

== Additional resources
* link:https://knative.dev/docs/serving/services/configure-probing/#general-understanding-of-knative-probing[General understanding of Knative Probing]