Do a backup as described here: 1.8.0 Backup
Request a login (username and password) for the Rentouch-Docker-Hub from Rentouch if you do not already have one.
docker login harbor3.piplanning.io
Install the updated offline installable images
docker load -i pi-server-images_1.8.0.tar
On the host-system download the newest version (checkout https://binaries.rentouch.ch/on-premise to see all versions) of the PI-Server docker archive and extract it:
mkdir -p pi-server-docker_1.8.0 && tar -xf pi-server-docker_1.8.0.tar -C pi-server-docker_1.8.0
Run the updater. You have to pass the path to your PI-Server folder (which contains the docker-compose and all the data) as the first argument.
python update.py /path/to/my/pi-server/installation
When the migration to the newest version is finished restart the pi-server by
As a last step: You can clean up by removing the installer
rm pi-server-docker_1.8.0.tar pi-server-docker_1.8.0
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