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31 lines
1.4 KiB
Markdown
31 lines
1.4 KiB
Markdown
---
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title: "Automatically Updating Podman Containers"
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date: 2022-05-15T22:20:47-04:00
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draft: false
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tags: ["Linux", "Containers"]
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math: false
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---
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Recently, I have been [transitioning to Podman](/blog/rootless-docker-compose-podman) for running my container infrastructure. In the process, I brought over Watchtower which I have previously used for auto-updating docker containers. Before doing so, I didn't check its [compatibility](https://github.com/containrrr/watchtower/issues/1060) (whoops) and found a few of my containers would every other week or so not come back up.
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I then remembered that I restart my server for general system updates almost every day. What if I perform the podman container updates on start up? After modiyfing my systemd service to include an extra field called `ExecStartPre` and removing Watchtower, I found no more missing containers! The field `ExecStartPre` performs a pull (update) before starting up the containers via `ExecStart`.
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```ini
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[Unit]
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Description=Docker Compose Application Service
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Requires=network.target podman.socket
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After=network.target podman.socket
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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WorkingDirectory=/home/brandonrozek
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ExecStartPre=/usr/bin/docker-compose pull
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ExecStart=/usr/bin/docker-compose up -d --force-recreate
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ExecStop=/usr/bin/docker-compose down
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TimeoutStartSec=0
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[Install]
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WantedBy=multi-user.target
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```
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