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+% podman-systemd.unit 5
+
+## NAME
+
+podman\-systemd.unit - systemd units using Podman
+
+## SYNOPSIS
+
+*name*.container, *name*.volume
+
+### Podman unit search path
+
+ * /etc/containers/systemd/
+ * /usr/share/containers/systemd/
+
+### Podman user unit search path
+
+ * $XDG_CONFIG_HOME/containers/systemd/
+ * ~/.config/containers/systemd/
+
+## DESCRIPTION
+
+Podman supports starting containers (and creating volumes) via systemd by using a
+[systemd generator](https://www.freedesktop.org/software/systemd/man/systemd.generator.html).
+These files are read during boot (and when `systemctl daemon-reload` is run) and generate
+corresponding regular systemd service unit files. Both system and user systemd units are supported.
+
+The Podman generator reads the search paths above and reads files with the extensions `.container`
+and `.volume`, and for each file generates a similarly named `.service` file. These units can be started
+and managed with systemctl like any other systemd service.
+
+The Podman files use the same format as [regular systemd unit files](https://www.freedesktop.org/software/systemd/man/systemd.syntax.html).
+Each file type has a custom section (for example, `[Container]`) that is handled by Podman, and all
+other sections will be passed on untouched, allowing the use of any normal systemd configuration options
+like dependencies or cgroup limits.
+
+### Enabling unit files
+
+The services created by Podman are considered transient by systemd, which means they don't have the same
+persistence rules as regular units. In particular, it is not possible to "systemctl enable" them
+in order for them to become automatically enabled on the next boot.
+
+To compensate for this, the generator manually applies the `[Install]` section of the container definition
+unit files during generation, in the same way `systemctl enable` would do when run later.
+
+For example, to start a container on boot, add something like this to the file:
+
+```
+[Install]
+WantedBy=multi-user.target
+```
+
+Currently, only the `Alias`, `WantedBy` and `RequiredBy` keys are supported.
+
+**NOTE:** To express dependencies between containers, use the generated names of the service. In other
+words `WantedBy=other.service`, not `WantedBy=other.container`. The same is
+true for other kinds of dependencies, too, like `After=other.service`.
+
+### Container units
+
+Container units are named with a `.container` extension and contain a `[Container] `section describing
+the container that should be run as a service. The resulting service file will contain a line like
+`ExecStart=podman run … image-name`, and most of the keys in this section control the command-line
+options passed to Podman. However, some options also affect the details of how systemd is set up to run and
+interact with the container.
+
+By default, the Podman container will have the same name as the unit, but with a `systemd-` prefix.
+I.e. a `$name.container` file will create a `$name.service` unit and a `systemd-$name` Podman container.
+
+There is only one required key, `Image`, which defines the container image the service should run.
+
+Supported keys in `Container` section are:
+
+#### `Image=`
+
+The image to run in the container. This image must be locally installed for the service to work
+when it is activated, because the generated service file will never try to download images.
+It is recommended to use a fully qualified image name rather than a short name, both for
+performance and robustness reasons.
+
+The format of the name is the same as when passed to `podman run`, so it supports e.g., using
+`:tag` or using digests guarantee a specific image version.
+
+#### `ContainerName=`
+
+The (optional) name of the Podman container. If this is not specified, the default value
+of `systemd-%N` will be used, which is the same as the service name but with a `systemd-`
+prefix to avoid conflicts with user-managed containers.
+
+#### `Environment=`
+
+Set an environment variable in the container. This uses the same format as
+[services in systemd](https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Environment=)
+and can be listed multiple times.
+
+#### `Exec=`
+
+If this is set then it defines what command line to run in the container. If it is not set the
+default entry point of the container image is used. The format is the same as for
+[systemd command lines](https://www.freedesktop.org/software/systemd/man/systemd.service.html#Command%20lines).
+
+#### `User=`
+
+The (numeric) uid to run as inside the container. This does not need to match the uid on the host,
+which can be set with `HostUser`, but if that is not specified, this uid is also used on the host.
+
+#### `HostUser=`
+
+The host uid (numeric or a username) to run the container as. If this differs from the uid in `User`,
+then user namespaces are used to map the ids. If unspecified, this defaults to what was specified in `User`.
+
+#### `Group=`
+
+The (numeric) gid to run as inside the container. This does not need to match the gid on the host,
+which can be set with `HostGroup`, but if that is not specified, this gid is also used on the host.
+
+#### `HostGroup=`
+
+The host gid (numeric or group name) to run the container as. If this differs from the gid in `Group`,
+then user namespaces are used to map the ids. If unspecified, this defaults to what was specified in `Group`.
+
+#### `NoNewPrivileges=` (defaults to `yes`)
+
+If enabled (which is the default), this disables the container processes from gaining additional privileges via things like
+setuid and file capabilities.
+
+#### `DropCapability=` (defaults to `all`)
+
+Drop these capabilities from the default container capability set. The default is `all`, allowing
+addition of capabilities with `AddCapability`. Set this to empty to drop no capabilities.
+This can be listed multiple times.
+
+#### `AddCapability=`
+
+By default, the container runs with no capabilities (due to DropCapabilities='all'). If any specific
+caps are needed, then add them with this key. For example using `AddCapability=CAP_DAC_OVERRIDE`.
+This can be listed multiple times.
+
+#### `ReadOnly=` (defaults to `no`)
+
+If enabled, makes image read-only, with /var/tmp, /tmp and /run a tmpfs (unless disabled by `VolatileTmp=no`).
+
+**NOTE:** Podman will automatically copy any content from the image onto the tmpfs
+
+#### `RemapUsers=` (defaults to `no`)
+
+If this is enabled, then host user and group ids are remapped in the container, such that all the uids
+starting at `RemapUidStart` (and gids starting at `RemapGidStart`) in the container are chosen from the
+available host uids specified by `RemapUidRanges` (and `RemapGidRanges`).
+
+#### `RemapUidStart=` (defaults to `1`)
+
+If `RemapUsers` is enabled, this is the first uid that is remapped, and all lower uids are mapped
+to the equivalent host uid. This defaults to 1 so that the host root uid is in the container, because
+this means a lot less file ownership remapping in the container image.
+
+#### `RemapGidStart=` (defaults to `1`)
+
+If `RemapUsers` is enabled, this is the first gid that is remapped, and all lower gids are mapped
+to the equivalent host gid. This defaults to 1 so that the host root gid is in the container, because
+this means a lot less file ownership remapping in the container image.
+
+#### `RemapUidRanges=`
+
+This specifies a comma-separated list of ranges (like `10000-20000,40000-50000`) of available host
+uids to use to remap container uids in `RemapUsers`. Alternatively, it can be a username, which means
+the available subuids of that user will be used.
+
+If not specified, the default ranges are chosen as the subuids of the `quadlet` user.
+
+#### `RemapGidRanges=`
+
+This specifies a comma-separated list of ranges (like `10000-20000,40000-50000`) of available host
+gids to use to remap container gids in `RemapUsers`. Alternatively, it can be a username, which means
+the available subgids of that user will be used.
+
+If not specified, the default ranges are chosen as the subgids of the `quadlet` user.
+
+#### `KeepId=` (defaults to `no`, only works for user units)
+
+If this is enabled, then the user uid will be mapped to itself in the container, otherwise it is
+mapped to root. This is ignored for system units.
+
+#### `Notify=` (defaults to `no`)
+
+By default, Podman is run in such a way that the systemd startup notify command is handled by
+the container runtime. In other words, the service is deemed started when the container runtime
+starts the child in the container. However, if the container application supports
+[sd_notify](https://www.freedesktop.org/software/systemd/man/sd_notify.html), then setting
+`Notify`to true will pass the notification details to the container allowing it to notify
+of startup on its own.
+
+#### `Timezone=` (if unset uses system-configured default)
+
+The timezone to run the container in.
+
+#### `RunInit=` (default to `yes`)
+
+If enabled (and it is by default), the container will have a minimal init process inside the
+container that forwards signals and reaps processes.
+
+#### `VolatileTmp=` (default to `yes`)
+
+If enabled (and it is by default), the container will have a fresh tmpfs mounted on `/tmp`.
+
+**NOTE:** Podman will automatically copy any content from the image onto the tmpfs
+
+#### `Volume=`
+
+Mount a volume in the container. This is equivalent to the Podman `--volume` option, and
+generally has the form `[[SOURCE-VOLUME|HOST-DIR:]CONTAINER-DIR[:OPTIONS]]`.
+
+As a special case, if `SOURCE-VOLUME` ends with `.volume`, a Podman named volume called
+`systemd-$name` will be used as the source, and the generated systemd service will contain
+a dependency on the `$name-volume.service`. Such a volume can be automatically be lazily
+created by using a `$name.volume` quadlet file.
+
+This key can be listed multiple times.
+
+#### `ExposeHostPort=`
+
+Exposes a port, or a range of ports (e.g. `50-59`), from the host to the container. Equivalent
+to the Podman `--expose` option.
+
+This key can be listed multiple times.
+
+#### `PublishPort=`
+
+Exposes a port, or a range of ports (e.g. `50-59`), from the container to the host. Equivalent
+to the Podman `--publish` option. The format is similar to the Podman options, which is of
+the form `ip:hostPort:containerPort`, `ip::containerPort`, `hostPort:containerPort` or
+`containerPort`, where the number of host and container ports must be the same (in the case
+of a range).
+
+If the IP is set to 0.0.0.0 or not set at all, the port will be bound on all IPv4 addresses on
+the host; use [::] for IPv6.
+
+Note that not listing a host port means that Podman will automatically select one, and it
+may be different for each invocation of service. This makes that a less useful option. The
+allocated port can be found with the `podman port` command.
+
+This key can be listed multiple times.
+
+#### `PodmanArgs=`
+
+This key contains a list of arguments passed directly to the end of the `podman run` command
+in the generated file (right before the image name in the command line). It can be used to
+access Podman features otherwise unsupported by the generator. Since the generator is unaware
+of what unexpected interactions can be caused by these arguments, is not recommended to use
+this option.
+
+The format of this is a space separated list of arguments, which can optionally be individually
+escaped to allow inclusion of whitespace and other control characters. This key can be listed
+multiple times.
+
+#### `Label=`
+
+Set one or more OCI labels on the container. The format is a list of `key=value` items,
+similar to `Environment`.
+
+This key can be listed multiple times.
+
+#### `Annotation=`
+
+Set one or more OCI annotations on the container. The format is a list of `key=value` items,
+similar to `Environment`.
+
+This key can be listed multiple times.
+
+### Volume units
+
+Volume files are named with a `.volume` extension and contain a section `[Volume]` describing the
+named Podman volume. The generated service is a one-time command that ensures that the volume
+exists on the host, creating it if needed.
+
+For a volume file named `$NAME.volume`, the generated Podman volume will be called `systemd-$NAME`,
+and the generated service file `$NAME-volume.service`.
+
+Using volume units allows containers to depend on volumes being automatically pre-created. This is
+particularly interesting when using special options to control volume creation, as Podman will
+otherwise create volumes with the default options.
+
+Supported keys in `Volume` section are:
+
+#### `User=`
+
+The host (numeric) uid, or user name to use as the owner for the volume
+
+#### `Group=`
+
+The host (numeric) gid, or group name to use as the group for the volume
+
+#### `Label=`
+
+Set one or more OCI labels on the volume. The format is a list of
+`key=value` items, similar to `Environment`.
+
+This key can be listed multiple times.
+
+
+Set one or more OCI labels on the volume. The format is a list of `key=value` items,
+similar to `Environment`.
+
+This key can be listed multiple times.
+
+## EXAMPLES
+
+Example `test.container`:
+
+```
+[Unit]
+Description=A minimal container
+Before=local-fs.target
+
+[Container]
+# Use the centos image
+Image=quay.io/centos/centos:latest
+Volume=test.volume:/data
+
+# In the container we just run sleep
+Exec=sleep 60
+
+[Service]
+# Restart service when sleep finishes
+Restart=always
+
+[Install]
+# Start by default on boot
+WantedBy=multi-user.target default.target
+```
+
+Example `test.volume`:
+
+```
+[Volume]
+User=root
+Group=projectname
+Label=org.test.Key=value
+```
+
+## SEE ALSO
+**[systemd.unit(5)](https://www.freedesktop.org/software/systemd/man/systemd.unit.html)**,
+**[systemd.service(5)](https://www.freedesktop.org/software/systemd/man/systemd.service.html)**,
+**[podman-run(1)](podman-run.1.md)**