be22bc735a
As part of the fix for #10668, the logic was adjusted so that the default (highest-priority) network is used in the `ContainerCreate`, and then the remaining networks are connected via calls to `NetworkConnect` before starting the container. Unfortunately, `ServiceConfig::NetworksByPriority` is neither deterministic nor stable when networks have the same priority. It's non-deterministic because the order of networks from parsing YAML is random, since they are loaded into a Go map (which have random iteration order). Additionally, it's not using a `SortStable` in `compose-go`, so even if the load order was predictable, it still might produce different results. While I look at improving `compose-go` here to prevent this from tripping us up in the future, this fix looks at _all_ networks for a service and ignores the "default" one now. Before, it would always skip the first one in the slice since that _should_ have been the "default". Signed-off-by: Milas Bowman <milas.bowman@docker.com> |
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README.md
Table of Contents
- Docker Compose v2
- About update and backward compatibility
- Where to get Docker Compose
- Quick Start
- Contributing
Docker Compose v2
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.
About update and backward compatibility
Docker Compose V2 is a major version bump release of Docker Compose. It has been completely rewritten from scratch in Golang (V1 was in Python). The installation instructions for Compose V2 differ from V1. V2 is not a standalone binary anymore, and installation scripts will have to be adjusted. Some commands are different.
For a smooth transition from legacy docker-compose 1.xx, please consider installing compose-switch to translate docker-compose ... commands into Compose V2's docker compose .... . Also check V2's --compatibility flag.
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
docker-compose.ymlso 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.