CODEWITHSUNDEEP
windowsdocker
Mike Christensen
Mike Christensen

Reputation: 91666

Is there a way to see container disk usage on Docker for Windows?

I'm curious if there's a way to see how much disk space a running Windows container is using in addition to the layers that are part of the container's image. Basically, how much the container "grew" since it was created.

In Linux (Or Linux containers running in a HyperV), this would be docker ps -s, however that command isn't implemented on Windows containers. I also tried docker system df -v but also, not implemented. Perhaps there's a hacky way by looking at a certain directly on disk or something?

Upvotes: 2

Views: 6999

Answers (2)

Peter Wishart
Peter Wishart

Reputation: 12310

I checked on Windows 10 1809 running non-HyperV (process isolation) containers, I'm pretty sure its the same for Windows Server containers.

The data seems to be kept in:

C:\ProgramData\Docker\windowsfilter\{ContainerId}

There's a direct reference to the folder in docker inspect {Id} under GraphDriver\Data\dir.

The folder contains file sandbox.vhdx which appears to be the "writable layer" of each container.

I wasn't able to open it and view the filesystem, but if I write some data inside the container I can force the file to grow:

  docker exec <Id> powershell get-childitem c:\ -recurse `> c:\windows\temp\test.txt

The layer persists when the container is stopped/restarted, and the folder is removed when the container is rmed.

While researching I saw an open PR in moby to improve cleanup of this folder.

Upvotes: 2

shaped
shaped

Reputation: 333

I'm using docker for windows (docker desktop 2.0.0.3) and docker ps -s is actually implemented.

CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS               NAMES               SIZE
81acb264aa0f        httpd               "httpd-foreground"   6 minutes ago       Up 6 minutes        80/tcp              httpd               2B (virtual 132MB)

Docker for windows runs on a MobyLinuxVM. You can access the VM and the docker directories:

docker run --privileged -it -v /var/run/docker.sock:/var/run/docker.sock jongallant/ubuntu-docker-client
root@8b58d2fbe186:/# docker run --net=host --ipc=host --uts=host --pid=host –it --security-opt=seccomp=unconfined --privileged --rm -v /:/host alpine /bin/sh
root@8b58d2fbe186:/# chroot /host

Now you can access the docker folders in /var/lib/docker as on linux and check the sizes.

Upvotes: 1

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