Exposing two ports in Google Container Engine

Question

Is it possible to create a Pod in the Google Container Engine where two ports are exposed: port 8080 is listening for incoming content and port 80 distributes this content to clients?

The following command to create a Pod is given as example by Google:

kubectl run hello-node --image=gcr.io/${PROJECT_ID}/hello-node --port=8080

I can't seem to define a listening port, and when adding a second "--port=" switch only one port is exposed. Is there a way to expose a second port or am I limited to one port per container?

Answer 1

No, you cannot specify multiple ports in kubectl run. But you can use kubectl create to create a replication controller, and specify multiple ports for the container.

https://github.com/kubernetes/examples/blob/master/cassandra/cassandra-statefulset.yaml has an example:

          ports:
        - containerPort: 7000
          name: intra-node
        - containerPort: 7001
          name: tls-intra-node
        - containerPort: 7199
          name: jmx
        - containerPort: 9042
          name: cql

Answer 2

You can use --port paramater two times kubectl run hello-node --image=gcr.io/${PROJECT_ID}/hello-node --port=8080 --port=8081

Answer 3

From the command line, it is possible to specify multiple ports using the --overrides option:

This example exposes both ports 80 and 8080:

    export APP_NAME=app-hello
    export IMAGE=gcr.io/google-samples/hello-app:1.0
    kubectl run $APP_NAME \
                --image=$IMAGE \
                --overrides='{"spec": {"template":  {"spec": {"containers": [{"name": "'$APP_NAME'", "image": "'$IMAGE'",
 "ports": [{"containerPort": 8080, "protocol": "TCP"}, {"containerPort": 80, "protocol": "TCP"}]}]}}}}'

Answer 4

Kubernetes supports a target port:

kubectl expose deployment example --type=LoadBalancer --port 8080 --target-port 80