4장. Configuring OpenShift Serverless applications

Procedure

1. Modify your service to include additional containers. Only one container can handle requests, so specify ports for exactly one container. Here is an example configuration with two containers:

   Multiple containers configuration

   apiVersion: serving.knative.dev/v1
   kind: Service
   ...
   spec:
     template:
       spec:
         containers:
           - name: first-container 

   1

   
             image: gcr.io/knative-samples/helloworld-go
             ports:
               - containerPort: 8080 

   2

   
           - name: second-container 

   3

   
             image: gcr.io/knative-samples/helloworld-java

   1

   First container configuration.

   2

   Port specification for the first container.

   3

   Second container configuration.

Procedure

1. Configure multi-container probing for your service by enabling the multi-container-probing feature in the KnativeServing CR.

   Multi-container probing configuration

   ...
   spec:
     config:
       features:
         "multi-container-probing": enabled 

   1

   
   ...

   1

   Enabled multi-container-probing feature

2. Apply the updated KnativeServing CR.

   $ oc apply -f <filename>

3. Modify your multi-container service to include the specified probes.

   Multi-container probing

   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