Horde App Migration
From Univention Wiki
Starting with version 5.2.7-3 the Horde App for UCS is available as a Docker App. New installations automatically using this Docker App.
To update an existing non-Docker Horde App to the new Docker Horde App a manual migration has to be done. Basically, Horde on the server (Docker host) is removed and installed in a new Docker container. Directories with horde data are mapped to the container and the container continues to use the database on the Docker host.
The following steps are necessary to migrate the non-Docker Horde App to Docker:
Check if docker works on the host
Run the following command to verify docker works, before starting the migration:
docker run hello-world
If this test fails, please contact the Univention Support or check the Univention Forum  for more information.
Save Horde UCR settings, prepare Horde App removal
ucr search --brief ^horde > /opt/horde-settings.txt cp -rf /etc/horde /opt/horde-conf apt-mark manual univention-mail-server apt-mark manual univention-postgresql
Remove Horde App
univention-app remove horde ucr unset appcenter/prudence/docker/horde
Install Horde Docker App
univention-app update univention-app register univention-app install horde
Verify Horde UCS settings in Docker container
univention-app shell horde ucr search --brief ^horde
- Since (dockerized) version 5.2.7-3, Horde sets the SMTP port to 587, not 25 as in the old version (UCR variable horde/mailer/params/port).
Further configurations (/etc/horde) or modifications of UCR settings have to be done in the container from now on. Use the following command to change into the new Horde App container:
univention-app shell horde