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cachingdockertravis-ci

Can Travis CI cache docker images?

Is it possible to add a setting to cache my docker image anywhere in the travis configuration ? Mine is a bigger docker image and it takes a while for it to download.

Any suggestions ?

Solution

  • See Caching Docker Images on Build #5358 for the answer(s). For Docker 1.12 available now on Travis, it is recommended to manually cache the images. For the Docker 1.13, you could use its --cache-from when it is on Travis.

    Save:

    before_cache:
  # Save tagged docker images
  - >
    mkdir -p $HOME/docker && docker images -a --filter='dangling=false' --format '{{.Repository}}:{{.Tag}} {{.ID}}'
    | xargs -n 2 -t sh -c 'test -e $HOME/docker/$1.tar.gz || docker save $0 | gzip -2 > $HOME/docker/$1.tar.gz'

    Load:

    before_install:
  # Load cached docker images
  - if [[ -d $HOME/docker ]]; then ls $HOME/docker/*.tar.gz | xargs -I {file} sh -c "zcat {file} | docker load"; fi

    Also need to declare a cache folder:

    cache:
  bundler: true
  directories:
    - $HOME/docker