57 lines
1.4 KiB
Markdown
57 lines
1.4 KiB
Markdown
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# Docker
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## Package policy
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The profile prefers Ubuntu's `docker.io` package. If that package is
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unavailable after an APT refresh, it configures Docker's official Ubuntu
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repository and installs Docker Engine, containerd, Buildx, and Compose plugins.
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This fallback requires network access to `download.docker.com`.
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## Daemon configuration
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The managed settings are:
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```json
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{
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"log-driver": "json-file",
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"log-opts": {
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"max-size": "50m",
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"max-file": "5"
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}
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}
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```
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Existing valid `/etc/docker/daemon.json` content is preserved and merged with
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these log settings. A changed file is backed up with a timestamp. Invalid JSON
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causes the profile to stop rather than overwrite operator configuration.
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Log limits apply to newly created containers. Existing containers may retain
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their original logging configuration until recreated.
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## Validation
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```bash
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docker version
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docker compose version
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docker info
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docker ps
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docker system df
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jq . /etc/docker/daemon.json
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```
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## Troubleshooting and rollback
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```bash
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systemctl status docker
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journalctl -u docker
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jq empty /etc/docker/daemon.json
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```
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To restore a previous daemon configuration, review a timestamped backup,
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replace the current file, validate it with `jq empty`, and restart Docker.
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Do not restore blindly when workloads depend on newer daemon settings.
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The profile does not configure Docker data roots, prune objects, deploy
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applications, or install the NVIDIA Container Toolkit.
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