persistent_data&volume.md

Persist the docker data

-v => stands for volume to map docker and host directory

Bind Host directory with docker directory

sudo docker run --name pgadmin -p 80:80 -v /var/lib/pgadmin:/var/lib/pgadmin  -e 'PGADMIN_DEFAULT_EMAIL=m.thirumal@hotmail.com' -e 'PGADMIN_DEFAULT_PASSWORD=thirumal' -d dpage/pgadmin4

Default Container volume

By default, when a container gets create, it also creates a volume/folder in /var/lib/docker/volumes and that will get delete when the container removed.

To keep the data persistant, (Create/Bind Volume)

Create VOLUME

The volume/directory will be created under /var/lib/docker/volumes

docker volume create postgresql_volume

List volumes

docker volume ls

Map volume

docker run -d -v postgresql_volume:/var/lib/postgres --name postgres -p 5432:5432 postgres:latest

Delete the container and volume

docker rm -fv {container_id}

Dangling volume

The volume which are create with container but not deleted.

To remove all dangling volume

docker volume rm $(docker volume ls -f=dangling=true -q)