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65 lines
3.2 KiB
Markdown
65 lines
3.2 KiB
Markdown
[Podman](https://podman.io/) is a daemonless alternative to Docker, which is mostly compatible with Docker containers.
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# Creating a systemd service file
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Podman is easier to run in systemd than Docker due to its daemonless architechture. It comes with a handy [generate systemd command](http://docs.podman.io/en/latest/markdown/podman-generate-systemd.1.html) which can generate systemd files. Here is a [good article that goes into more detail](https://www.redhat.com/sysadmin/podman-shareable-systemd-services) as well as [this article detailing some more recent updates](https://www.redhat.com/sysadmin/improved-systemd-podman).
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```sh
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$ podman run -d --name vaultwarden -v /vw-data/:/data/:Z -e ROCKET_PORT=8080 -p 8080:8080 vaultwarden/server:latest
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54502f309f3092d32b4c496ef3d099b270b2af7b5464e7cb4887bc16a4d38597
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$ podman generate systemd --name vaultwarden
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# container-foo.service
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# autogenerated by Podman 1.6.2
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# Tue Nov 19 15:49:15 CET 2019
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[Unit]
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Description=Podman container-foo.service
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Documentation=man:podman-generate-systemd(1)
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[Service]
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Restart=on-failure
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ExecStart=/usr/bin/podman start vaultwarden
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ExecStop=/usr/bin/podman stop -t 10 vaultwarden
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KillMode=none
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Type=forking
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PIDFile=/run/user/1000/overlay-containers/54502f309f3092d32b4c496ef3d099b270b2af7b5464e7cb4887bc16a4d38597/userdata/conmon.pid
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[Install]
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WantedBy=multi-user.target default.target
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```
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You can provide a `--files` flag to dedicate a specific file to output the systemd service file to. With this we can enable and start the container as any normal service file.
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```sh
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$ systemctl --user enable /etc/systemd/system/container-vaultwarden.service
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$ systemctl --user start container-vaultwarden.service
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```
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## New container every restart
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If we want to create a new container every time the service starts we can edit the service file to contain the following:
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```sh
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[Unit]
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Description=Podman container-vaultwarden.service
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[Service]
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Restart=on-failure
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ExecStartPre=/usr/bin/rm -f /%t/%n-pid /%t/%n-cid
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ExecStart=/usr/bin/podman run --conmon-pidfile /%t/%n-pid --cidfile /%t/%n-cid --env-file=/home/spytec/Vaultwarden/vaultwarden.conf -d -p 8080:8080 -v /home/spytec/Vaultwarden/vw-data:/data/:Z vaultwarden/server:latest
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ExecStop=/usr/bin/podman stop -t "15" --cidfile /%t/%n-cid
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ExecStop=/usr/bin/podman rm -f --cidfile /%t/%n-cid
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KillMode=none
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Type=forking
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PIDFile=/%t/%n-pid
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[Install]
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WantedBy=multi-user.target default.target
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```
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Where `vaultwarden.conf` environment file can contain all the container environment values you need
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```conf
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ROCKET_PORT=8080
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```
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If you want the container to have a specific name, you might need to add `ExecStartPre=/usr/bin/podman rm -i -f vaultwarden` if the process isn't cleaned up correctly. Note that this method currently doesn't work with the `User=` options users (see https://github.com/containers/podman/issues/5572).
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# Troubleshooting
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## Debugging systemd service file
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If the host goes down or the container crashes, the systemd service file should automatically stop the existing container and spin it up again. We can find the error through `journalctl --user -u container-vaultwarden -t 100`.
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Most of the time the errors we see can be fixed by simply upping the timeout in podman command in the service file. |