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content/blog/auto-updating-podman-containers.md

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+---
+title: "Automatically Updating Podman Containers"
+date: 2022-05-15T22:20:47-04:00
+draft: false
+tags: []
+math: false
+---
+
+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.
+
+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`.
+
+```ini
+[Unit]
+Description=Docker Compose Application Service
+Requires=network.target podman.socket
+After=network.target podman.socket
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+WorkingDirectory=/home/brandonrozek
+ExecStartPre=/usr/bin/docker-compose pull
+ExecStart=/usr/bin/docker-compose up -d --force-recreate
+ExecStop=/usr/bin/docker-compose down
+TimeoutStartSec=0
+
+[Install]
+WantedBy=multi-user.target
+```
+