Dockerfile

FROM buildpack-deps:jessie

RUN mkdir -p /app/data && touch /app/data/PROCESS-$(date +%s)

CMD ["ls", "/app/data"]

steps.txt

✘╹◡╹✘ < docker build -t voltest:latest .
Sending build context to Docker daemon  3.072kB
Step 1/3 : FROM buildpack-deps:jessie
 ---> a00998d35d0b
Step 2/3 : RUN mkdir -p /app/data && touch /app/data/PROCESS-$(date +%s)
 ---> Using cache
 ---> 10a29dbd69e2
Step 3/3 : CMD ["ls", "/app/data"]
 ---> Using cache
 ---> 7fe95c074e78
Successfully built 7fe95c074e78
Successfully tagged voltest:latest
✘╹◡╹✘ < docker run --rm -v /app/data voltest:latest
PROCESS-1532440436
✘╹◡╹✘ < docker run --rm -v $PWD/data:/app/data voltest:latest
✘╹◡╹✘ < docker volume ls
DRIVER              VOLUME NAME
local               data
✘╹◡╹✘ < docker volume inspect data
[
    {
        "CreatedAt": "2018-07-24T14:04:13Z",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/data/_data",
        "Name": "data",
        "Options": {},
        "Scope": "local"
    }
]
✘╹◡╹✘ < docker run --name voltest-run --rm -v $PWD/data:/app/data voltest:latest sleep 100000
✘╹◡╹✘ < docker inspect voltest-run | jq '.[].Mounts'
[
  {
    "Type": "bind",
    "Source": "/Users/aereal/docker-volumes-test/data",
    "Destination": "/app/data",
    "Mode": "",
    "RW": true,
    "Propagation": "rprivate"
  }
]
✘>﹏<✘ < docker run --name voltest-run --rm -v /app/data voltest:latest sleep 100000
✘╹◡╹✘ < docker inspect voltest-run | jq '.[].Mounts'
[
  {
    "Type": "volume",
    "Name": "58c5afe073edac995fd0a121f15460224f0902cff234aaa5efc160e213999032",
    "Source": "/var/lib/docker/volumes/58c5afe073edac995fd0a121f15460224f0902cff234aaa5efc160e213999032/_data",
    "Destination": "/app/data",
    "Driver": "local",
    "Mode": "",
    "RW": true,
    "Propagation": ""
  }
]