share-docker-volumes

#!/usr/bin/env bash

set -Eeuo pipefail

echo "==> Creating volume 'vol1'..."
docker volume create vol1

echo "==> Writing 'hi!'..."
docker run --rm -v vol1:/mounted busybox sh -c 'echo "hi!" > /mounted/hi.txt'

echo "==> Appending 'hi2' (from a different container)..."
docker run --rm -v vol1:/mounted busybox sh -c 'echo "hi2" >> /mounted/hi.txt'

echo "==> Reading contents from a third container"
docker run --rm -v vol1:/mounted busybox sh -c 'cat /mounted/hi.txt'

# Output: $ ./share-docker-volumes
# ==> Creating volume 'vol1'...
# vol1
# ==> Writing 'hi!'...
# ==> Appending 'hi2' (from a different container)...
# ==> Reading contents from a third container
# hi!
# hi2