Solve the problem that the directory mounted by docker cannot be read and written

Use the following command to create a container and mount the local /home/dock/Downloads directory to /usr/Downloads in the container:

[root@docker ~]# docker run -it -v /home/dock/Downloads:/usr/Downloads ubuntu /bin/bash

After creating on Centos, the following problems will occur

root@637fe9ea94f0:/usr/Downloads# ls
ls: cannot open directory '.': Permission denied

Solution:

The reason is that the security module selinux in CentOS7 has disabled the permissions.

There are several ways to solve the problem of no permissions on the mounted directory:

1. When running the container, add privileges to the container and add the --privileged=true parameter:

docker run -i -t -v /soft:/soft --privileged=true 637fe9ea94f0 /bin/bash

2. Temporarily turn off selinux:

setenforce 0

3. Add selinux rules and change the security text of the directory to be mounted

Supplement: After docker mounts the folder, it cannot be accessed and has no permissions

After entering docker run, the mounted folder cannot be accessed and there is no permission

For example:

sudo nvidia-docker run -p 8090:8888 -p 8091:80 -p 8092:6666 --name=pytorch0.4 -v ~/workspace:/root/workspace -i --shm-size 31G -t dsksd/pytorch:0.4.1 /bin/bash

The host's workspace folder is mounted with the container's /root/workspace folder, but data cannot be written to the workspace folder on the host. Because the owner of the folder is root at this time.

You can execute the command:

sudo chown -R $USER folder location (/workspace)

The folder can be read and written. However, you need to re-execute the above command after restarting.

The above is my personal experience. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM. If there are any mistakes or incomplete considerations, please feel free to correct me.