This page is dedicated to help you migrating an instance from YunoHost 11.x (running on Debian Bullseye) to YunoHost 12 (running on Debian Bookworm).
The YunoHost team did its best to make sure that the migration is as smooth as possible and was tested over the course of several months in several cases.
Please backup your data and server! This migration is a complex operation and covering every pitfall is quite hard. And in any case, be patient and attentive during the migration.
Please don't rush into thinking that you should need to reinstall your system from scratch thinking it would be "simpler" (sigh). (A common attitude is to be willing to reinstall a server at the slightest complication...). Instead, if you happen to run into issues, we encourage you to try to investigate and understand what's going on and reach for help on the chat and the forum.
You should watch the known issues at the bottom of this page, to be sure your migrations will work properly.
You first need to ensure your system is up to date. The migration is available starting with the version 11.3.
It is recommended to run the migration from the command line, but it can still be done from the webadmin.
Go to Tools > Migrations to access the migrations interface. You will have to read carefully and accept the disclaimer then launch the migration.
Note that even if you close the webadmin page for some reason, the migration will continue in the background (but the webadmin will be partially unavailable).
Just run :
sudo yunohost tools migrations runthen read carefully and accept the disclaimer.
Depending on your hardware and packages installed, the migration might take up to a few hours.
The logs will be shown in the message bar (you can hover it to see the whole history). They will also be available after the migration (like any other operations) in Tools > Logs.
If the migration failed at some point, it should be possible to relaunch it. If it still doesn't work, you can try to get help (please provide the corresponding messages or whatever makes you say that it's not working).
For this, go to Diagnosis (category Base system) or look at the footer of the webadmin. In the command line, you can use lsb_release -a and yunohost --version.
Some more migrations appeared after the upgrade:
You should run those as soon as possible to ensure your apps work properly.
In the webadmin Diagnosis section, make sure that no specific issue appeared after running the migration (for example a service that crashed for some reason).
Test that your applications are working. If they aren't, you should try to upgrade them (it is also a good idea to upgrade them even if they are working anyway).
If your app is broken and you were already with the latest version, you can rerun the upgrade thanks to the -F|--force option:
yunohost app upgrade --force APP_NAMEPlease check the issues FAQ.
Found errors? Think you can improve this documentation? Simply click the Edit link at the top of the page, and then the icon on Github to suggest changes.
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