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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?
398
From the Service type drop-down list, select Node port. Click Expose. When your Service is ready, the Service details page opens, and you can see details about your Service. Under Ports, make a note of the Node Port that Kubernetes assigned to your Service.
I understand that containers within a Pod are actually under the same network namespace, which enables accessing another container in the Pod with localhost or 127.0. 0.1 . It means containers can't use the same port.
At the same time, a Pod can contain more than one container, usually because these containers are relatively tightly coupled.
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
Pointed out in another answer using kubernetes allows targeting, but also multiple ports:
kubectl expose deployment example --type=LoadBalancer --port 8080,8081 --target-port 80
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