Solution to the docker command exception "permission denied"

In Linux system, newly install docker and enter the command, such as: docker images

The result was abnormal.

Simply put, the current user's connection is rejected.

Solution 1:

Use administrator privileges, add sudo before the command

Solution 2:

Add the current user to the docker user group

sudo groupadd docker #Add the docker user group. This user group should already exist. sudo gpasswd -a $USER docker #Add the current user to the docker user group. newgrp docker #Update the user group docker.

Then execute docker images

This can be used normally

Supplement: Docker -v has no permission for the mounted directory. Solution to Permission denied

Description of the situation

Today I am using docker run -d -p 9091:8080 -v /home/daniu/docker/tomcat/webapps/:/usr/local/tomcat/webapps/ --name managertomcat daniu/mytomcat

After mounting the path, enter the container

root@08066d03a043:/usr/local/tomcat# cd webapps/
root@08066d03a043:/usr/local/tomcat/webapps# ls
ls: cannot open directory '.': Permission denied
root@08066d03a043:/usr/local/tomcat/webapps#

When viewing webapps, it prompts that there is no permission.

reason:

The security module selinux in centos7 disabled the permissions.

There are three ways to solve it:

1. Add --privileged=true at runtime

[daniu@localhost tomcat]$ docker run -d -p 9091:8080 -v /home/daniu/docker/tomcat/webapps/:/usr/local/tomcat/webapps/ --privileged=true --name managertomcat xuhaixing/mytomcat
c512137b74f3366da73ff80fc1fd232cc76c95b52a4bab01f1f5d89d28185b28
[daniu@localhost tomcat]$ ls

2. Temporarily turn off selinux and then turn it on again

[daniu@localhost tomcat]# setenforce 0
[daniu@localhost tomcat]# setenforce 1

3. Add linux rules and add the directory to be mounted to the selinux whitelist

# The format for changing security context is as follows: chcon [-R] [-t type] [-u user] [-r role] File or directory options without parameters: 
-R: All directories under this directory are also modified at the same time; 
-t: followed by the type field of the security document, for example httpd_sys_content_t; 
-u : followed by identity identification, for example system_u; 
-r: The color of the following street, for example system_r
implement:
chcon -Rt svirt_sandbox_file_t /home/daniu/docker/tomcat/webapps/

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.

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