admin:linux:podman [~wiki]

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====== Podman ======
Podman manages containers like [[.:docker:|Docker]] and [[k8s|Kubernetes]].

===== Use with systemd =====

==== generic service ====
Generate the pod, then ''%%systemctl edit --full --force pod@.service%%'' to create a new service file with the following content:

<file ini pod@.service>
[Unit]
Description=Podman pod %I
After=network.target

[Service]
KillMode=none
RemainAfterExit=yes
ExecStartPre=/usr/bin/podman pod exists %i
ExecStart=/usr/bin/podman pod start %i
ExecStop=/usr/bin/podman pod stop -t 10 %i

[Install]
WantedBy=multi-user.target
</file>

Add a new pod as a service: ''systemctl enable pod@PODNAME.service''.

==== timer ====
If you want to execute something periodically, use the service created above as ''Requisite'' for the service:

<file ini echo-xy-z.service>
[Unit]
Description=Do something with the service xy inside pod z periodically.
After=pod@z.service
Requisite=pod@z.service

[Service]
Type=oneshot
ExecStart=podman exec -ti z_xy_1 /bin/echo 0
</file>

And create a timer based on that service:

<file ini echo-xy-z.timer>
[Unit]
Description=Put a meaningful description here

[Timer]
# start 10min after boot, then repeat every 10min
OnBootSec=10min
OnUnitActiveSec=10min
Unit=echo-xy-z.service

[Install]
WantedBy=timers.target
</file>

===== Principles =====

===== further reading =====
  * Series "Dockerless" by mkdev:
    * [[https://mkdev.me/en/posts/dockerless-part-3-moving-development-environment-to-containers-with-podman|part 3: Moving development environment to containers with Podman]]