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generate systemd: warn on --restart without --new

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Emit a warning to the user when generating a unit with --new on a
container that was created with a custom --restart policy. As shown
in #15284, a custom --restart policy in that case can lead to issues
on system shutdown where systemd attempts to nuke the unit but Podman
keeps on restarting the container.

Fixes: #15284
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
This commit is contained in:
Valentin Rothberg
2022-09-13 09:38:42 +02:00
parent 4aeaeafde5
commit 0ea5080c91
3 changed files with 22 additions and 1 deletions
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docs/source/markdown/podman-generate-systemd.1.md
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@ -85,7 +85,9 @@ Set the systemd unit requires (`Requires=`) option. Similar to wants, but declar
#### **--restart-policy**=*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*.
"on-watchdog", "on-abort", or "always". The default policy is *on-failure* unless the container was created with a custom restart policy.
Note that generating a unit without `--new` on a container with a custom restart policy can lead to issues on shutdown; systemd will attempt to stop the unit while Podman tries to restart it. It is recommended to to create the container without `--restart` and use the `--restart-policy` option instead when generating the unit file.
#### **--restart-sec**=*time*