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auto-update: clarify systemd-unit requirements

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Clarify in the help message and the man page that auto updates only work
with systemd units that are similar to the ones from `generate systemd
--new`.  Units that merely start/stop a container do not work as they
will use the same image.

Fixes: #6793
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
This commit is contained in:
Valentin Rothberg
2020-07-06 11:14:33 +02:00
parent 41ccc045fb
commit 0ef5def0be
2 changed files with 5 additions and 0 deletions
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docs/source/markdown/podman-auto-update.1.md
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@ -23,6 +23,9 @@ Note that `podman auto-update` relies on systemd and requires a fully-qualified
This enforcement is necessary to know which image to actually check and pull.
If an image ID was used, Podman would not know which image to check/pull anymore.
Moreover, the systemd units are expected to be generated with `podman-generate-systemd --new`, or similar units that create new containers in order to run the updated images.
Systemd units that start and stop a container cannot run a new image.
## OPTIONS
**--authfile**=*path*