computer-playbook/roles/docker-joomla/vars/main.yml

docker_compose_instance_directory: "{{path_docker_compose_instances}}joomla/"
database_instance:  	  "joomla"
database_host:      	  "database"
database_databasename:  "{{database_instance}}"
database_username:  	  "{{database_instance}}"
database_password:  	  "{{joomla_database_password}}"