dynamic-pod-init

A small helper container to initialize dynamic pods.

Usage

The container uses the following environment variables:

• TARGET_DIR : the target directory to extract files to. Defaults to /
• TEMPLATE_DIR : template directory whose contents will be copied to TARGET_DIR. Ignored if empty
• PATCHES : a space-separated list of archive-file urls. These archives will be extracted to TARGET_DIR. Ignored if empty

Example

This is an example k8s Pod configuration which will copy all contents from /template to /app and extract the provided archives to /app. Note the shared volume temp-app-data which is necessary for the init-container's changes in /app to be persistent for the main application container.

apiVersion: v1
kind: Pod
metadata:
  name: example-app
spec:
  volumes:
  - name: template-storage
    persistentVolumeClaim:
      claimName: template-pv-claim
  - name: temp-app-data
    emptyDir: {}
  initContainers:
  - name: dynamic-pod-init
    image: ben/dynamic-pod-init
    volumeMounts:
    - name: template-storage
      mountPath: /template
    - name: temp-app-data
      mountPath: /app
    env:
      - name: TARGET_DIR
        value: "/app"
      - name: TEMPLATE_DIR
        value: "/template"
      - name: "PATCHES"
        value: "https://example.com/patch.tar https://foo.bar/another_archive.zip"
  containers:
  - name: app
    image: example-image
    volumeMounts:
    - name: template-storage
      mountPath: /template
    - name: temp-app-data
      mountPath: /app