k8s:Two images but single container [duplicate]

问题

Below are the exact words of a question that came up in an online test.

Create an single container app running in a pod named "bla-bla" with any 3 of the four images listed below. Images: nginx + redis+ memcached.

I'm not sure whether this is a wordplay or a typo but what I would like to know is whether there is any syntax for launching multiple images in a single container? I know this can be done by having multiple containers within a single pod but according to the wordings in the question, I don't think that is what they expect. I saw this same exact question in Kubernetes official forum but no answer there too. Hence posting it here so it can reach a wider audience.

Forum Question: https://discuss.kubernetes.io/t/can-we-have-a-single-container-with-multiple-image-like-nginx-redis-alpine/12017

回答1:

I don't see the problem with the question. It asks to create a single "container app running in a pod", not a "single container".

So single pod with multiple containers is the answer. Here is the example.

apiVersion: v1
kind: Pod
metadata:
  name: two-containers
spec:

  restartPolicy: Never

  volumes:
  - name: shared-data
    emptyDir: {}

  containers:

  - name: nginx-container
    image: nginx
    volumeMounts:
    - name: shared-data
      mountPath: /usr/share/nginx/html

  - name: debian-container
    image: debian
    volumeMounts:
    - name: shared-data
      mountPath: /pod-data
    command: ["/bin/sh"]
    args: ["-c", "echo Hello from the debian container > /pod-data/index.html"]

回答2:

If you are looking for a single command like "kubectl run bla-bla --image xyz" I dont think there is one.

Easiest way imo is to do something like that.

kubectl run bla-blah --image nginx --dry-run=client -o yaml > multi-container-pod.yaml.
edit the yaml and run kubectl apply -f

来源：https://stackoverflow.com/questions/65666271/k8stwo-images-but-single-container

标签

Kubernetes

containers

kubernetes-pod