# Docker

## Manage containers

* Start a container from a compose file: `docker-compose up -d`
* Access a container: `docker exec -it CONTAINER bash`

* Remove a volume not associated with any container: `docker volume prune`

## List containers

* Show running containers: `docker ps`

* Show all existing containers: `docker ps -a`

## Database

* Backup a database from a container
  `docker exec CONTAINER /usr/bin/mysqldump -u root --password=root DATABASE > backup.sql`

* Restore a database to a container
  `cat backup.sql | docker exec -i CONTAINER /usr/bin/mysql -u root --password=root DATABASE`

## Specifics use

### Nextcloud

* Manage a Nextcloud Docker instance
  `docker exec -u www-data -it nextcloud-web php occ maintenance:mode --off`