the mount point can not mount to docker

[chgyi]

i have test the juicefs, but it can not mount into docker .

[xiaogaozi]

@chgyi Can you use the issue template to report more information?

[davies]

@chgyi Can you added steps to reproduce the issue?

[chgyi]

@chgyi Can you added steps to reproduce the issue?

more information?
First i run juicefs format and juicefs mount first , and i works 。 for example i mount if it /home/ubuntu/test_juc/fs
./juicefs mount -d localhost /home/ubuntu/test_juc/fs xxxxxx

then i run docker run commant , it get the errors .

docker run -it -v /home/ubuntu/test_juc/fs/:/data -w /data localhost/ubuntu/bin/bash

docker: Error response from daemon: error while creating mount source path '/home/ubuntu/test_juc/fs': mkdir /home/ubuntu/test_juc/fs: file exists.
ERRO[0000] error waiting for container: context canceled

[chnliyong]

@chgyi It seems you mount JuiceFS with user ubuntu. When mounting JuiceFS with non-root user using default fuse options, the allow_other is absent, then root has no permission access the mount point.

For this case, docker will create the /home/ubuntu/test_juc/fs/ directory if it doesn't exist, when it check the existence of the directory (maybe using stat system call), Permission denied error would return, then docker try to mkdir it, file exists error returned.

2 Ways to resolve this:

1. Mounting JuiceFS with root user
2. Add user_allow_other configuration to /etc/fuse.conf where fuse use, then mounting JuiceFS with option -o allow_other. Use this with caution as all other accounts can walk to your mount path if the have the parent directory permission.