Bug 50057 - Reinitialize Docker App
Reinitialize Docker App
Product: UCS
Classification: Unclassified
Component: App Center
UCS 4.4
Other Linux
: P5 normal (vote)
: UCS 4.4-1-errata
Assigned To: Dirk Wiesenthal
Jannik Ahlers
Depends on:
Blocks: 50071
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Reported: 2019-08-26 14:24 CEST by Dirk Wiesenthal
Modified: 2019-08-28 15:50 CEST (History)
0 users

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Description Dirk Wiesenthal univentionstaff 2019-08-26 14:24:11 CEST
We want to be able to reinitialize a running Docker App: This creates a new container but with the latest App Settings.

This is necessary, if the App cannot apply App Settings during runtime but relies on getting those as environment variables during the container creation.
Comment 1 Dirk Wiesenthal univentionstaff 2019-08-26 14:34:50 CEST
Fixed in
  univention-appcenter 8.0.11-52A~

Essentially this is a "remove" + "install" but with the new settings. In fact, we already have that: "univention-app upgrade" does this when a new image is found. So we use this method here (but with the very same image...)

This way store_data and restore_data is implemented properly. Also copying the correct files (/etc/machine.secret, ...) is already done.

We just need to make sure that we do not use credentials:
* No setup script called
* No App Attributes registered

App Attributes are just skipped - the App was already installed successfully, no need to do it again. The setup script may be mandatory and may rely on credentials: The script refuses to continue in this case.

This is how it works:
Put this into your configure_host script:
if [ "$1" = "settings" ]; then
  univention-app reinitialize $myapp
Comment 2 Jannik Ahlers univentionstaff 2019-08-28 09:35:12 CEST
Reinitialization works for multi container apps: OK
Env variables get passed correctly for multi container apps: OK
Reinitialization works for single container apps: OK
Env variables get passed correctly for single container apps: OK
Installation: OK
YAML: I did a small typo fix, otherwise OK

-> Verified
Comment 3 Erik Damrose univentionstaff 2019-08-28 15:50:04 CEST