Ok, i will check this solution.

Permission errors when trying to start the OP7 container

If you run into permission errors trying to start the OP7 container, you might have advanced tmpfs protections in place. Disable them temporarily with sudo sysctl fs.protected_regular=0 (https://askubuntu.com/questions/1250974)

Uff, it works!

Ok, so i did it! :)

1. Install OS - I chose ubuntu 22
2. Install OP from apt - https://www.openproject.org/docs/installation-and-operations/installation/packaged/
3. Install docker
4. Next - https://askubuntu.com/questions/1250974/user-root-cant-write-to-file-in-tmp-owned-by-someone-else-in-20-04-but-can-in - to run docker with OPv7
5. Look at the script https://github.com/opf/openproject/blob/dev/script/migration/migrate-from-pre-8.sh
6. Backup OPv5, database and files.
7. If your OP run on MySQL then you are at home, use script from #5, if not, read next points.

What i did to migrate:

1. I have completed points 1 to 6
2. openproject configure, install psqlv13, then stop openproject
3. create database openproject on postgresql v13
4. get database url - openproject config:get DATABASE_URL
5. restore db from backup OPv5 - pg_restore --clean --if-exists -h localhost -p 45432 -U op -d yourbackupfile
6. run dockers: docker run -d --name op7 openproject/community:7  docker run -d --name op8 openproject/community:8  docker run -d --name op10 openproject/community:10
7. reconfigure psql to listen from all host
8. start migrating

docker exec -it op7 /bin/sh -c "DATABASE_URL=put_here_your_database_url_point_4 bundle exec rake db:migrate"

docker exec -it op8 /bin/sh -c "DATABASE_URL=put_here_your_database_url_point_4 bundle exec rake db:migrate"

docker exec -it op10 /bin/sh -c "DATABASE_URL=put_here_your_database_url_point_4 bundle exec rake db:migrate"

openproject configure

and you are done! :)

put ssl to apache - certboot

put RequestHeader set X-Forwarded-Proto "https" to apache.conf

Congratulations and thank you for sharing the walk through, it will help others for sure in the future :) . Great job!