Can Travis CI cache docker images?
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"; fiAlso need to declare a cache folder:
cache: bundler: true directories: - $HOME/docker
Docker images are not recommended to be cached regard to Travis document herehttps://docs.travis-ci.com/user/caching/#things-not-to-cache