Filesystem actions in containers fail with `Too many levels of symbolic links`
This document (000020104) is provided subject to the disclaimer at the end of this document.
When attempting to perform a filesystem action inside a container with a volume located on an autofs directory, the error
Too many levels of symbolic links is thrown and the action fails.
bash: cd: /data: Too many levels of symbolic links
- Docker container or Kubernetes Pod with a volume defined that is mounted on the host with autofs, typically backed by NFS
As the share that backs the autofs volume isn't mounted until the directory specified is accessed, it is typically not mounted when a container is run.
With the default Docker bind-mount propagation of
rprivate, containers do not receive mount changes for volumes from the host.
Docker - Mount the volume in question with the flag
rshared to ensure that mount changes are propagated to the container.
docker run -d -v /path/to/autofs:/data:shared ubuntu
See the links at the bottom of this article for info on what each of these flags does
Kubernetes - Define mountPropagation for the volume in question as either
HostToContainer (same as Docker's
Bidirectional (same as Docker's
kind: Pod apiVersion: v1 metadata: name: test-app spec: containers: - name: test image: busybox volumeMounts: - mountPath: "/data" name: test-app-vol mountPropagation: HostToContainer volumes: - name: test-app-vol hostPath: path: /data
Docker bind propagation - https://docs.docker.com/storage/bind-mounts/#configure-bind-propagation
Kubernetes mountPropagation - https://kubernetes.io/docs/concepts/storage/volumes/#mount-propagation
Linux Kernel Shared Subtree - https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
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- Document ID:000020104
- Creation Date: 09-Jul-2021
- Modified Date:09-Jul-2021
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