agill17 / pod-mutating-webhook

A kubernetes mutating webhook that mutates container images to desired images

pod-mutating-webhook

Are you struggling to migrate your docker images from dockerhub to your local repository, because of dockerhub rate limits? But there are too many images to migrate, and you need something quick to swap to an internal/proxy registry? Well, you have come to right place. I was also struggling to migrate dockerhub images to an internal registry because of dockerhub rate limiting. This webhook makes use of kubernetes admission controller and mutates pod images based on rules. You can specify which image to change and to what using the chart values file, these are called imageRules. imageRules are key:val pairs that defines which image (key) should be replaced with other image (value).

Note: For mutation to work for a pod in a namespace, that namespace must be labeled with pod-mutating-webhook: enabled

Example imageRules in chart values file:

imageRules: |
    # swap all new pods with mysql:5.7 image to internal.proxy.registry/mysql:5.7
    "mysql:5.7": "internal.proxy.registry/mysql:5.7" 
    # swap all new pods with agill17/test:latest image to a specific tag agill17/test:0.1.0
    "agill17/test:latest": "agill17/test:0.1.0"

Deploy

$ make install

Uninstall

$ make uninstall

Build

$ make build