Docker: remove obsolete version keys from Compose files

If you use Docker Compose, you may see this message:

$ docker compose up -d
WARN[0000] /.../example/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion
...

The warning refers to a version key in your Compose file. This key is ignored by Docker Compose since version 2, which was made generally available in 2022. The Docker Compose history documentation states:

Version two of the Docker Compose command-line binary was announced in 2020, is written in Go, and is invoked with docker compose. Compose v2 ignores the version top-level element in the compose.yaml file.

To action the message, remove the version key from your Compose files:

-version: "3.7"
-
 services:
   postgresql:

Your base Compose file is typically called compose.yaml or docker-compose.yml. Remove version from any extra Compose files too, such as override files passed to docker compose -f, which are typically called docker-compose.override.yml or similar.

After removing the version key, docker compose commands should no longer show the warning.

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Related posts:

• Docker: Clean up unused stuff on your development machine

Tags: docker