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79 lines
2.3 KiB
Markdown
79 lines
2.3 KiB
Markdown
---
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date: 2022-01-29 20:21:11-05:00
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draft: false
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math: false
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medium_enabled: true
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medium_post_id: d31b7e2a688c
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tags:
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- Containers
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title: Rootless Docker-Compose with Podman
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---
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*Note: Nowadays, I prefer to use [Quadlets](/blog/migrating-docker-compose-podman-quadlets/)*
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One of the benefits of Podman over Docker is that it can run daemon-less and without root. However, `docker-compose` is by far my favorite way to create and maintain containers. Luckily, the Podman folks emulated the Docker CLI so that `docker-compose` works well with Podman!
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To install:
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```bash
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sudo dnf install -y podman podman-docker docker-compose
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```
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We can then emulate the docker socket rootless with the following commands:
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```bash
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systemctl --user enable podman.socket
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systemctl --user start podman.socket
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```
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At this point, we'll want to see if the daemon acts as expected
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```bash
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curl -H "Content-Type: application/json" \
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--unix-socket /var/run/user/$UID/podman/podman.sock \
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http://localhost/_ping
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```
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This should return `OK`. We then need to create an environmental variable to tell docker compose where the emulated docker socket lives.
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```bash
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export DOCKER_HOST=unix:///run/user/$UID/podman/podman.sock
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```
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To have this environmental variable persistent across reboots, add the above line to the user's `.bash_profile`.
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You'll need a configuration file `docker-compose.yml` defined. Here is a sample one that spins up an image updating service. Replace `$UID` with your user id which you can get from running `id -u` in the terminal.[^1]
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```yaml
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version: "3.3"
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services:
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watchtower:
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image: docker.io/containrrr/watchtower
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container_name: watchtower
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hostname: watchtower
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environment:
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PUID: 1000
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PGID: 1000
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TZ: US/Eastern
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volumes:
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- /var/run/user/$UID/podman/podman.sock:/var/run/docker.sock:ro
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restart: always
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```
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If you want to add to add more volumes to the container, make sure it has the appropriate SELinux label if
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you're using a distribution with it enabled.[^2]
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```bash
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chcon -t container_file_t -R X
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```
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where `X` is the volume you wish to mount.
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Now we can run `docker-compose`!
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```bash
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docker-compose ps
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```
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[^1]: Thanks to Ian Evans for sending in a correction to the volumes declaration.
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[^2]: https://bugzilla.redhat.com/show_bug.cgi?id=2125878
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