Persistent database with docker-compose not working

I am running a docker-compose project in a DigitalOcean Docker droplet.

I also have a persistent volume. It has been mounted on /mnt/volume_fra1_01

In my docker-compose.yml, I defined the volume for the database:


    image: postgres:12.0-alpine
      - postgres_data:/var/lib/postgresql/data/
      - ./postgres/.env




and I’ve created the symbolic link with sudo ln -s /mnt/volume_fra1_01 postgres_data

But I the database is not persistent. When I purge the containers the database is gone. Somehow /var/lib/postgresql/data/ is not using the mounted volume.


Submit an answer
You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Won’t the postgres data be written to the docker data directory, meaning you would need to pass the full path to ln? Something like:

sudo ln -s /mnt/volume_fra1_01 /var/lib/docker/postgres_data/_data