Automatically Updating Podman Containers
Recently, I have been transitioning to 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 (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
[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