| podman-generate-systemd(1)() | podman-generate-systemd(1)() |
podman-generate-systemd - Generate systemd unit file(s) for a container or pod. Not supported for the remote client
podman generate systemd [options] container|pod
podman generate systemd will create a systemd unit file that can be used to control a container or pod. By default, the command will print the content of the unit files to stdout.
Note: If you use this command with the remote client, you would still have to place the generated units on the remote system.
Generate files instead of printing to stdout. The generated files are named {container,pod}-{ID,name}.service and will be placed in the current working directory.
Note: On a system with SELinux enabled, the generated files will inherit contexts from the current working directory. Depending on the SELinux setup, changes to the generated files using restorecon, chcon, or semanage may be required to allow systemd to access these files. Alternatively, use the -Z option when running mv or cp.
Print the created units in specified format (json). If --files is specified the paths to the created files will be printed instead of the unit content.
Use the name of the container for the start, stop, and description in the unit file
Using this flag will yield unit files that do not expect containers and pods to exist. Instead, new containers and pods are created based on their configuration files. The unit files are created best effort and may need to be further edited; please review the generated files carefully before using them in production.
Override the default stop timeout for the container with the given value.
Set the systemd restart policy. The restart-policy must be one of: "no", "on-success", "on-failure", "on-abnormal", "on-watchdog", "on-abort", or "always". The default policy is on-failure.
Set the systemd unit name prefix for containers. The default is container.
Set the systemd unit name prefix for pods. The default is pod.
Set the systemd unit name separator between the name/id of a container/pod and the prefix. The default is -.
Generate a systemd unit file for a container running nginx with an always restart policy and 1-second timeout to stdout.
$ podman create --name nginx nginx:latest $ podman generate systemd --restart-policy=always -t 1 nginx # container-de1e3223b1b888bc02d0962dd6cb5855eb00734061013ffdd3479d225abacdc6.service # autogenerated by Podman 1.8.0 # Wed Mar 09 09:46:45 CEST 2020 [Unit] Description=Podman container-de1e3223b1b888bc02d0962dd6cb5855eb00734061013ffdd3479d225abacdc6.service Documentation=man:podman-generate-systemd(1) [Service] Restart=always ExecStart=/usr/bin/podman start de1e3223b1b888bc02d0962dd6cb5855eb00734061013ffdd3479d225abacdc6 ExecStop=/usr/bin/podman stop -t 1 de1e3223b1b888bc02d0962dd6cb5855eb00734061013ffdd3479d225abacdc6 KillMode=none Type=forking PIDFile=/run/user/1000/overlay-containers/de1e3223b1b888bc02d0962dd6cb5855eb00734061013ffdd3479d225abacdc6/userdata/conmon.pid [Install] WantedBy=multi-user.target default.target
The --new flag generates systemd unit files that create and remove containers at service start and stop commands (see ExecStartPre and ExecStopPost service actions). Such unit files are not tied to a single machine and can easily be shared and used on other machines.
$ sudo podman generate systemd --new --files --name bb310a0780ae # container-busy_moser.service # autogenerated by Podman 1.8.3 # Fri Apr 3 09:40:47 EDT 2020 [Unit] Description=Podman container-busy_moser.service Documentation=man:podman-generate-systemd(1) Wants=network.target After=network-online.target [Service] Environment=PODMAN_SYSTEMD_UNIT=%n Restart=on-failure ExecStartPre=/bin/rm -f %t/%n-pid %t/%n-cid ExecStart=/usr/local/bin/podman run --conmon-pidfile %t/%n-pid --cidfile %t/%n-cid --cgroups=no-conmon -d -dit alpine ExecStop=/usr/local/bin/podman stop --ignore --cidfile %t/%n-cid -t 10 ExecStopPost=/usr/local/bin/podman rm --ignore -f --cidfile %t/%n-cid PIDFile=%t/%n-pid KillMode=none Type=forking [Install] WantedBy=multi-user.target default.target
Note systemctl should only be used on the pod unit and one should not start or stop containers individually via systemctl, as they are managed by the pod service along with the internal infra-container.
You can still use systemctl status or journalctl to examine container or pod unit files.
$ podman pod create --name systemd-pod $ podman create --pod systemd-pod alpine top $ podman create --pod systemd-pod alpine top $ podman generate systemd --files --name systemd-pod /home/user/pod-systemd-pod.service /home/user/container-amazing_chandrasekhar.service /home/user/container-jolly_shtern.service $ cat pod-systemd-pod.service # pod-systemd-pod.service # autogenerated by Podman 1.8.0 # Wed Mar 09 09:52:37 CEST 2020 [Unit] Description=Podman pod-systemd-pod.service Documentation=man:podman-generate-systemd(1) Requires=container-amazing_chandrasekhar.service container-jolly_shtern.service Before=container-amazing_chandrasekhar.service container-jolly_shtern.service [Service] Restart=on-failure ExecStart=/usr/bin/podman start 77a818221650-infra ExecStop=/usr/bin/podman stop -t 10 77a818221650-infra KillMode=none Type=forking PIDFile=/run/user/1000/overlay-containers/ccfd5c71a088768774ca7bd05888d55cc287698dde06f475c8b02f696a25adcd/userdata/conmon.pid [Install] WantedBy=multi-user.target default.target
Podman-generated unit files include an [Install] section, which carries installation information for the unit. It is used by the enable and disable commands of systemctl(1) during installation.
Once you have generated the systemd unit file, you can copy the generated systemd file to /etc/systemd/system for installing as a root user and to $HOME/.config/systemd/user for installing it as a non-root user. Enable the copied unit file or files using systemctl enable.
Note: Copying unit files to /etc/systemd/system and enabling it marks the unit file to be automatically started at boot. And similarly, copying a unit file to $HOME/.config/systemd/user and enabling it marks the unit file to be automatically started on user login.
# Generated systemd files. $ podman pod create --name systemd-pod $ podman create --pod systemd-pod alpine top $ podman generate systemd --files --name systemd-pod # Copy all the generated files. $ sudo cp pod-systemd-pod.service container-great_payne.service /etc/systemd/system $ systemctl enable pod-systemd-pod.service Created symlink /etc/systemd/system/multi-user.target.wants/pod-systemd-pod.service → /etc/systemd/system/pod-systemd-pod.service. Created symlink /etc/systemd/system/default.target.wants/pod-systemd-pod.service → /etc/systemd/system/pod-systemd-pod.service. $ systemctl is-enabled pod-systemd-pod.service enabled
To run the user services placed in $HOME/.config/systemd/user on first login of that user, enable the service with --user flag.
$ systemctl --user enable <.service>
The systemd user instance is killed after the last session for the user is closed. The systemd user instance can be kept running ever after the user logs out by enabling lingering using
$ loginctl enable-linger <username>
Create and enable systemd unit files for a pod using the above examples as reference and use systemctl to perform operations.
Since systemctl defaults to using the root user, all the changes using the systemctl can be seen by appending sudo to the podman cli commands. To perform systemctl actions as a non-root user use the --user flag when interacting with systemctl.
$ systemctl --user start pod-systemd-pod.service $ podman pod ps POD ID NAME STATUS CREATED # OF CONTAINERS INFRA ID 0815c7b8e7f5 systemd-pod Running 29 minutes ago 2 6c5d116f4bbe $ sudo podman ps # 0 Number of pods on root. CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES $ systemctl stop pod-systemd-pod.service $ podman pod ps POD ID NAME STATUS CREATED # OF CONTAINERS INFRA ID 272d2813c798 systemd-pod Exited 29 minutes ago 2 6c5d116f4bbe
Create a simple alpine container and generate the systemd unit file with --new flag. Enable the service and control operations using the systemctl commands.
Note: When starting the container using systemctl start rather than altering the already running container it spins up a "new" container with similar configuration.
# Enable the service. $ sudo podman ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES bb310a0780ae docker.io/library/alpine:latest /bin/sh 2 minutes ago Created busy_moser $ sudo systemctl start container-busy_moser.service $ sudo podman ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 772df2f8cf3b docker.io/library/alpine:latest /bin/sh 1 second ago Up 1 second ago distracted_albattani bb310a0780ae docker.io/library/alpine:latest /bin/sh 3 minutes ago Created busy_moser
podman(1), systemctl(1), systemd.unit(5), systemd.service(5)
April 2020, Updated details and added usecase to use generated .service files as root and non-root, by Sujil Shah (sushah at redhat dot com)
August 2019, Updated with pod support by Valentin Rothberg (rothberg at redhat dot com)
April 2019, Originally compiled by Brent Baude (bbaude at redhat dot com)