How to Enable Docker layer caching in Azure DevOps

Question

I am running the below yaml script to build docker images and push into kubernetes cluster but at the same time I wanted to enable docker layer caching in the azure DevOps while

Answer 1

Here's how I fixed this. I just pull the latest version of the image from my registry (Azure Container Registry in my case) to the Azure DevOps hosted agent. Then I add --cache-from to the Docker build arguments pointing to this latest tag which it just downloaded to the local machine/cache.

- task: Docker@2
  inputs:
    containerRegistry: '$(ContainerRegistryName)'
    command: 'login'

- script: "docker pull $(ACR_ADDRESS)/$(REPOSITORY):latest"
  displayName: Pull latest for layer caching
  continueOnError: true # for first build, no cache

- task: Docker@2
  displayName: build
  inputs:
    containerRegistry: '$(ContainerRegistryName)'
    repository: '$(REPOSITORY)'
    command: 'build'
    Dockerfile: './dockerfile '
    buildContext: '$(BUILDCONTEXT)'
    arguments: '--cache-from=$(ACR_ADDRESS)/$(REPOSITORY):latest' 
    tags: |
      $(Build.BuildNumber)
      latest

- task: Docker@2
  displayName: "push"
  inputs:
    command: push
    containerRegistry: "$(ContainerRegistryName)"
    repository: $(REPOSITORY) 
    tags: |
      $(Build.BuildNumber)
      latest