Compose: Cannot create container for service: Duplicate mount point '/dev/shm'

[rvernica]

There seems to be an issue with tmpfs or /dev/shm when re-creating containers.

I have the following in the docker-compose.yml file:

version: '3.1'
services:
  ...
    tmpfs: /dev/shm:exec,size=1g
    volumes:
      - /dev/shm

When I initially bring this up with docker-compose up it works fine. If I stop it and try to bring it up while also rebuilding the images I get:

> docker-compose up --build
Building ...
...
Successfully built 9a694583ae45
Recreating f2ead6bb4fb2_..._1

ERROR: for ...  Cannot create container for service ...: Duplicate mount point '/dev/shm'
ERROR: Encountered errors while bringing up the project.

---

> docker-compose --version
docker-compose version 1.11.2, build dfed245
> docker --version
Docker version 17.03.0-ce, build 60ccb22

[shin-]

Looks like the same issue as #4162

I'll take a look, thank you for the report.

[guiccbr]

Hello, @shin- , this issue seems to be affecting not only tmpfs data volumes, but also regular ones.

I have a Dockerfile that looks like the following and I'm suffering from the exact same symptoms.

version: '3.4'
volumes:
  media_volume:
services:
  svc:
    ...
    volumes:
      - type: volume
        source: media_volume
        target: /media

After bringing up it works fine, then if I try to run docker-compose build then docker-compose up it fails.

ERROR: for ...  Cannot create container for service ...: Duplicate mount point: /media
ERROR: Encountered errors while bringing up the project.

SW Version:

> docker-compose --version
docker-compose version 1.18.0, build unknown

> docker --version
Docker version 17.12.0-ce, build 486a48d270

Would you have any clue of why this is happening? Thanks.

[shin-]

@guiccbr Can you create a new issue and include the commands you're running in order to reproduce the issue? Thanks!

[usr42]

I've encountered the same issue. For me it looks like it is happening when there is a volume defined in the docker image itself and also in the docker-compose.yml.
I've created a minimal example how to reproduce the error:
https://github.com/usr42/docker-compose-error-duplicate-mount-point

[jonnytest1]

i removed the previous container together with its volume when i had the problem -> solved it