delete all containers :
docker rm -f $(docker ps -a -q) delete all volumes : docker volume rm $(docker volume ls -q) ---to delete images : -- docker image rm $(docker images -a -q ) install docker-compose ubuntu 20 : sudo curl -L "https://github.com/docker/compose/releases/download/1.26.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose sudo chmod +x /usr/local/bin/docker-compose docker-compose --version install open project : https://www.openproject.org/docs/installation-and-operations/installation/docker/ in docker compose file there is a parameter named : host_name change it to the domain which you want to server open project :) if you got this error : ERROR: Invalid interpolation format for "environment" option in service "web": "${OPENPROJECT_RAILS__RELATIVE__URL__ROOT:-}" change docker-compose to docker compose in the command .