Question 98135 in Nginx Question posted in
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Docker init container mounting existing files issue – Nginx

We had build a docker image that contains an existing file inside. /opt/app/agent/oneagent. When I test the docker image individually, i can see the file inside the directory.

However, when I use it as an initcontainer to mount that directory to the main container, it does not see the directory.

apiVersion: v1
kind: Pod
metadata:
  name: test
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80
    volumeMounts:
    - name: workdir
      mountPath: /data
  # These containers are run during pod initialization
  initContainers:
  - name: dynainit
    image: localhost:5000/dyna1
    imagePullPolicy: IfNotPresent
    command: ["/bin/sh"]
    args: ["ls -la /opt/app/agent/oneagent"]
    volumeMounts:
    - name: workdir
      mountPath: "/data"
  dnsPolicy: Default
  volumes:
  - name: workdir
    emptyDir: {}

the init container logs it shows
/bin/sh: can’t open ‘ls -la /opt/app/agent/oneagent’: No such file or directory

What i really want to do is mount /opt/app/agent/oneagent from the init container to the main container.

Is that possible to mount existing files or init containers can only work by downloading the file in the beginning?

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I got it working using "-c" inside the command key.

    apiVersion: v1
kind: Pod
metadata:
  name: test
spec:
  initContainers:
  - name: dynainit
    image: localhost:5000/dyna1
    imagePullPolicy: IfNotPresent
    command: ["/bin/sh", "-c"]
    args: ["cp -R /opt/app/agent /data"]
    volumeMounts:
    - name: workdir
      mountPath: "/data"
  dnsPolicy: Default
  volumes:
  - name: workdir
    emptyDir: {}
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80
    volumeMounts:
    - name: workdir
      mountPath: /opt/app

  2. 0

    You can copy files from your init container /opt/app/agent/oneagent to workdir volume. When your main container mount workdir it will see the files copied. The error in your question is not volume related, just add -c to your command will do.

        ...
    command: ["/bin/sh","-c"]
    args: ["ls -la /opt/app/agent/oneagent"]
    ...
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