62 lines
2.1 KiB
Markdown
62 lines
2.1 KiB
Markdown
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---
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description: Troubleshooting volume errors
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keywords: cadvisor, troubleshooting, volumes, bind-mounts
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title: Troubleshoot volume errors
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redirect_from:
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- /engine/admin/troubleshooting_volume_errors/
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---
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This topic discusses errors which may occur when you use Docker volumes or bind
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mounts.
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## `Error: Unable to remove filesystem`
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Some container-based utilities, such
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as [Google cAdvisor](https://github.com/google/cadvisor), mount Docker system
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directories, such as `/var/lib/docker/`, into a container. For instance, the
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documentation for `cadvisor` instructs you to run the `cadvisor` container as
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follows:
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```bash
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$ sudo docker run \
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--volume=/:/rootfs:ro \
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--volume=/var/run:/var/run:rw \
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--volume=/sys:/sys:ro \
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--volume=/var/lib/docker/:/var/lib/docker:ro \
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--publish=8080:8080 \
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--detach=true \
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--name=cadvisor \
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google/cadvisor:latest
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```
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When you bind-mount `/var/lib/docker/`, this effectively mounts all resources of
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all other running containers as filesystems within the container which mounts
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`/var/lib/docker/`. When you attempt to remove any of these containers, the
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removal attempt may fail with an error like the following:
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```none
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Error: Unable to remove filesystem for
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74bef250361c7817bee19349c93139621b272bc8f654ae112dd4eb9652af9515:
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remove /var/lib/docker/containers/74bef250361c7817bee19349c93139621b272bc8f654ae112dd4eb9652af9515/shm:
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Device or resource busy
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```
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The problem occurs if the container which bind-mounts `/var/lib/docker/`
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uses `statfs` or `fstatfs` on filesystem handles within `/var/lib/docker/`
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and does not close them.
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Typically, we would advise against bind-mounting `/var/lib/docker` in this way.
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However, `cAdvisor` requires this bind-mount for core functionality.
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If you are unsure which process is causing the path mentioned in the error to
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be busy and preventing it from being removed, you can use the `lsof` command
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to find its process. For instance, for the error above:
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```bash
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$ sudo lsof /var/lib/docker/containers/74bef250361c7817bee19349c93139621b272bc8f654ae112dd4eb9652af9515/shm
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```
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To work around this problem, stop the container which bind-mounts
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`/var/lib/docker` and try again to remove the other container.
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