How to mount a volume in a container?

DockerJunior~1 min read

A volume is mounted into a container using the -v (or --mount) flag when starting the container. The formula is simple:

javascript

docker run -v <volume_name>:<path_inside_container> image_name

Let's create a volume and mount it into a container:

bash

docker volume create mydata
docker run -d -v mydata:/usr/share/data nginx

Now everything the container writes to /usr/share/data will be stored in the volume and will not disappear when the container is recreated.

compose uses the same principle:

yaml

services:
  app:
    image: nginx
    volumes:
      - mydata:/usr/share/data

volumes:
  mydata:

In short: to mount a volume, specify -v volume_name:path_in_container, or do the same in docker-compose.yml.

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