Generate systemd unit files for containers

the podman generate systemd command will generate a systemd unit file
based on the attributes of an existing container and user inputs.  the
command outputs the unit file to stdout for the user to copy or
redirect.  it is enabled for the remote client as well.

users can set a restart policy as well as define a stop timeout
override for the container.

Signed-off-by: baude <bbaude@redhat.com>

3 files changed, 71 insertions, 16 deletions

diff --git a/docs/podman-generate-systemd.1.md b/docs/podman-generate-systemd.1.md
new file mode 100644
index 000000000..cc3f098a6
--- /dev/null
+++ b/docs/podman-generate-systemd.1.md
@@ -0,0 +1,69 @@
+% podman-generate Podman Man Pages
+% Brent Baude
+% April 2019
+# NAME
+podman-generate-systemd- Generate Systemd Unit file
+
+# SYNOPSIS
+**podman generate systemd** [*-n*|*--name*] [*-t*|*--timeout*] [*--restart-policy*] *container*
+
+# DESCRIPTION
+**podman generate systemd** will create a Systemd unit file that can be used to control a container.  The
+command will dynamically create the unit file and output it to stdout where it can be piped by the user
+to a file.  The options can be used to influence the results of the output as well.
+
+
+# OPTIONS:
+
+**--name** **-n**
+
+Use the name of the container for the start, stop, and description in the unit file
+
+**--timeout** **-t**
+
+Override the default stop timeout for the container with the given value.
+
+**--restart-policy**
+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*.
+
+## Examples ##
+
+Create a systemd unit file for a container running nginx:
+
+```
+$ sudo podman generate systemd nginx
+[Unit]
+Description=c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc Podman Container
+[Service]
+Restart=on-failure
+ExecStart=/usr/bin/podman start c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+ExecStop=/usr/bin/podman stop -t 10 c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+KillMode=none
+Type=forking
+PIDFile=/var/lib/containers/storage/overlay-containers/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc/userdata/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc.pid
+[Install]
+WantedBy=multi-user.target
+```
+
+Create a systemd unit file for a container running nginx with an *always* restart policy and 1-second timeout.
+```
+$ sudo podman generate systemd --restart-policy=always -t 1 nginx
+[Unit]
+Description=c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc Podman Container
+[Service]
+Restart=always
+ExecStart=/usr/bin/podman start c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+ExecStop=/usr/bin/podman stop -t 1 c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc
+KillMode=none
+Type=forking
+PIDFile=/var/lib/containers/storage/overlay-containers/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc/userdata/c21da63c4783be2ac2cd3487ef8d2ec15ee2a28f63dd8f145e3b05607f31cffc.pid
+[Install]
+WantedBy=multi-user.target
+```
+
+## SEE ALSO
+podman(1), podman-container(1)
+
+# HISTORY
+April 2019, Originally compiled by Brent Baude (bbaude at redhat dot com)
diff --git a/docs/podman-generate.1.md b/docs/podman-generate.1.md
index d1736f38e..5a2386778 100644
--- a/docs/podman-generate.1.md
+++ b/docs/podman-generate.1.md
@@ -14,6 +14,7 @@ The generate command will create structured output (like YAML) based on a contai
 | Command  | Man Page                                            | Description                                                                  |
 | -------  | --------------------------------------------------- | ---------------------------------------------------------------------------- |
 | kube     | [podman-generate-kube(1)](podman-generate-kube.1.md)| Generate Kubernetes YAML based on a pod or container.                        |
+| systemd  | [podman-generate-systemd(1)](podman-generate-systemd.1.md)| Generate a systemd unit file for a container.                        |
 
 ## SEE ALSO
 podman, podman-pod, podman-container
diff --git a/docs/podman-run.1.md b/docs/podman-run.1.md
index 5190e5d14..9efb7f51c 100644
--- a/docs/podman-run.1.md
+++ b/docs/podman-run.1.md
@@ -593,7 +593,7 @@ Not implemented.
 
 Restart should be handled via a systemd unit files. Please add your podman
 commands to a unit file and allow systemd or your init system to handle the
-restarting of the container processes. See example below.
+restarting of the container processes. See *podman generate systemd*.
 
 **--rm**=*true*|*false*
 
@@ -1151,21 +1151,6 @@ the uids and gids from the host.
 $ podman run --uidmap 0:30000:7000 --gidmap 0:30000:7000 fedora echo hello
 ```
 
-### Running a podman container to restart inside of a systemd unit file
-
-
-```
-[Unit]
-Description=My App
-[Service]
-Restart=always
-ExecStart=/usr/bin/podman start -a my_app
-ExecStop=/usr/bin/podman stop -t 10 my_app
-KillMode=process
-[Install]
-WantedBy=multi-user.target
-```
-
 ### Configuring Storage Options from the command line
 
 Podman allows for the configuration of storage by changing the values