K
Q

Kubernetes config file from host to container?

3/27/2019

I am getting an error mounting a config file, can anyone assist?

With subPath on volumeMounts I get the error:

Error: stat /var/config/openhim-console.json: no such file or directory.

I can read this file.

Without subPath on volumeMounts I get this error:

Warning  Failed   13s                kubelet, ip-10-0-65-230.eu-central-1.compute.internal  Error: failed to start container "openhim-console": Error response from daemon: oci runtime error: container_linux.go:262: starting container process caused "process_linux.go:339: container init caused \"rootfs_linux.go:57: mounting \\\"/var/config/openhim-console.json\\\" to rootfs \\\"/var/lib/docker/overlay2/7408e2aa7e93b3c42ca4c2320681f61ae4bd4b02208364eee8da5f51d587ed21/merged\\\" at \\\"/var/lib/docker/overlay2/7408e2aa7e93b3c42ca4c2320681f61ae4bd4b02208364eee8da5f51d587ed21/merged/usr/share/nginx/html/config/default.json\\\" caused \\\"not a directory\\\"\""
: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type
  Warning  BackOff  2s  kubelet, ip-10-0-65-230.eu-central-1.compute.internal  Back-off restarting failed container

Here is the deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: openhim-console-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      component: openhim-console
  template:
    metadata:
      labels:
        component: openhim-console
    spec:
      volumes:
        - name: console-config
          hostPath:
            path: /var/config/openhim-console.json
      containers:
        - name: openhim-console
          image: jembi/openhim-console:1.13.rc
          ports:
            - containerPort: 80
          volumeMounts:
            - name: console-config
              mountPath: /usr/share/nginx/html/config/default.json
              subPath: default.json
          env:
            - name: NODE_ENV
              value: development
-- Anton Swanevelder
kubernetes

Similar Questions

Is there a way to make kustomize merge headings in a yaml file instead of completely replacing that heading with the overlay yaml
Kubernetes Dashboard does not accept service account's token over HTTP: Authentication failed. Please try again
What is the proper way to deal with the HTTPProxyCIDR WARNING and to setup no_proxy in an environment that sits behind a proxy
Dynamic namespace variable in helm chart
Kubernetes Jupyter Server with Example Notebook and Persistent Storage

2 Answers

3/27/2019

You should either use:

  volumes:
  - name: host-file
    hostPath:
      path: /var/log/waagent.log
      type: File

or

  volumes:
  - name: test-volume
    hostPath:
      path: /data
      # Directory is the default, so this field is optional. 
      type: Directory

Example:

apiVersion: v1
kind: Pod
metadata:
  name: test-pd
spec:
  containers:
  - image: k8s.gcr.io/test-webserver
    name: test-container
    volumeMounts:
    - mountPath: /test-pd
      name: test-volume
    - mountPath: /var/log/lala/aaa.log
      name: host-file
  volumes:
  - name: test-volume
    hostPath:
      path: /data
      # this field is optional
      type: Directory
  - name: host-file
    hostPath:
      path: /var/log/waagent.log
      type: File

subpath is generally used when you need to mount only one path inside the container instead of the root.

You can find more details in the docs.

-- Diego Mendes
Source: StackOverflow
3/27/2019

Probably hostPath should hold a path rather than your file path: /var/config/openhim-console.json as you're mounting a volume, not a file.

If you are, the type should be specified as File.

See also docs#hostpath

-- Webber
Source: StackOverflow