Guillaume Lours
d5e275dfb8
compose pull switched on the raw pull_policy string: daily/weekly/every_N never matched a case and fell through to an unconditional re-pull, and the hook-image loop was a second interpreter that ignored the refresh window entirely. Delegate the decision to the exact interpreter the up path uses (mustPull), with hook images routed through the same decision (build mapped to missing — a hook image can't be built as a fallback). Two deliberate differences with up are kept and documented in shouldPullImage: a service without an explicit pull_policy is always refreshed (skipping it would turn an explicit compose pull into a no-op once images exist), and a present latest tag is still refreshed under missing/if_not_present — the tag is expected to move, and triggering the pull lets the daemon negotiate with the registry, a manifest check with no download when the local image is already current. User-visible change (changelog): compose pull now honors daily/weekly/every_N refresh windows instead of always re-pulling. Signed-off-by: Guillaume Lours <[email protected]>
Table of Contents
Docker Compose
Docker Compose is a tool for running multi-container applications on Docker
defined using the Compose file format.
A Compose file is used to define how one or more containers that make up
your application are configured.
Once you have a Compose file, you can create and start your application with a
single command: docker compose up.
Note
: About Docker Swarm Docker Swarm used to rely on the legacy compose file format but did not adopt the compose specification so is missing some of the recent enhancements in the compose syntax. After acquisition by Mirantis swarm isn't maintained by Docker Inc, and as such some Docker Compose features aren't accessible to swarm users.
Where to get Docker Compose
Windows and macOS
Docker Compose is included in Docker Desktop for Windows and macOS.
Linux
You can download Docker Compose binaries from the release page on this repository.
Rename the relevant binary for your OS to docker-compose and copy it to $HOME/.docker/cli-plugins
Or copy it into one of these folders to install it system-wide:
/usr/local/lib/docker/cli-pluginsOR/usr/local/libexec/docker/cli-plugins/usr/lib/docker/cli-pluginsOR/usr/libexec/docker/cli-plugins
(might require making the downloaded file executable with chmod +x)
Quick Start
Using Docker Compose is a three-step process:
- Define your app's environment with a
Dockerfileso it can be reproduced anywhere. - Define the services that make up your app in
compose.yamlso they can be run together in an isolated environment. - Lastly, run
docker compose upand Compose will start and run your entire app.
A Compose file looks like this:
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: redis
Contributing
Want to help develop Docker Compose? Check out our contributing documentation.
If you find an issue, please report it on the issue tracker.
Legacy
The Python version of Compose is available under the v1 branch.