Volumes

Use the more verbose mount approach or the more succinct volume approach.

• Volumes in the Docker docs.

If you start a container with a volume that does not yet exist, Docker creates the volume for

Mount vs Volume

From the docs. Both approaches here give the same results.

Using the --mount flag.

$ docker run \
  --name devtest \
  --mount source=myvol2,target=/app \
  nginx:latest

Using the --volume flag.

$ docker run \
  --name devtest \
  -v myvol2:/app \
  nginx:latest

Volume

Using the --volume flag.

$ docker run --help
...
  -v, --volume list                    Bind mount a volume
...

Set the from path on the host and the to path in the container.

--volume=FROM:TO

--volume=./src:/usr/lib/src
--volume=$PWD:/app

You can’t use . for from as you’ll get an error that is must be at least two characters. So you the working directory with $PWD.

e.g.

$ docker run \
  -it \
  --rm \
  -p 4000:4000
  --volume "$PWD:/srv/jekyll" \
  jekyll/jekyll:$JEKYLL_VERSION \
  jekyll build --trace