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Diffstat (limited to 'docs/source/markdown/options/systemd.md')
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diff --git a/docs/source/markdown/options/systemd.md b/docs/source/markdown/options/systemd.md new file mode 100644 index 000000000..a341edbc2 --- /dev/null +++ b/docs/source/markdown/options/systemd.md @@ -0,0 +1,29 @@ +#### **--systemd**=*true* | *false* | *always* + +Run container in systemd mode. The default is **true**. + +The value *always* enforces the systemd mode is enforced without +looking at the executable name. Otherwise, if set to true and the +command you are running inside the container is **systemd**, **/usr/sbin/init**, +**/sbin/init** or **/usr/local/sbin/init**. + +Running the container in systemd mode causes the following changes: + +* Podman mounts tmpfs file systems on the following directories + * _/run_ + * _/run/lock_ + * _/tmp_ + * _/sys/fs/cgroup/systemd_ + * _/var/lib/journal_ +* Podman sets the default stop signal to **SIGRTMIN+3**. +* Podman sets **container_uuid** environment variable in the container to the +first 32 characters of the container id. + +This allows systemd to run in a confined container without any modifications. + +Note that on **SELinux** systems, systemd attempts to write to the cgroup +file system. Containers writing to the cgroup file system are denied by default. +The **container_manage_cgroup** boolean must be enabled for this to be allowed on an SELinux separated system. +``` +setsebool -P container_manage_cgroup true +``` |