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Editor to share with you how to execute Docker commands without using sudo. I hope you will get something after reading this article. Let's discuss it together.

Problem

After installing docker by default, you need to run the sudo command every time you execute docker, which is a waste of time and affects efficiency.

If you do not follow sudo, executing the docker images command directly will have the following problems:

[liujun@li1581-58] $docker psCannot connect to the Docker daemon. Is the docker daemon running on this host? [liujun@li1581-58 ~] $ps-ef | grep dockerroot 7427 April 24? 00:13:22 / usr/bin/dockerd-current-- add-runtime docker-runc=/usr/libexec/docker/docker-runc-current-- default-runtime=docker-runc-- exec-opt native.cgroupdriver=systemd-- userland-proxy-path=/usr/libexec/docker/docker-proxy-current-- selinux-enabled-- log-driver=journald-- signature-verification=falseroot 7431 7427 April 24? 00:01:13 / usr/bin/docker-containerd-current-l unix:///var/run/docker/libcontainerd/docker-containerd.sock-- shim docker-containerd-shim-- metrics-interval=0-- start-timeout 2m-- state-dir / var/run/docker/libcontainerd/containerd-- runtime docker-runc-- runtime-args-- systemd-cgroup=trueroot 7738 7427 April 24? 00:00:02 / usr/libexec/docker/docker-proxy-current- Proto tcp-host-ip 0.0.0.0-host-port 9797-container-ip 172.17.0.2-container-port 9797root 7762 7431 April 24? 00:00:03 / usr/bin/docker-containerd-shim-current 4db3d279d762fd42a7ba9e773ba47d6b6d61c157247afd395c4a83ae8a35ca77 / var/run/docker/libcontainerd/4db3d279d762fd42a7ba9e773ba47d6b6d61c157247afd395c4a83ae8a35ca77 / usr/libexec/docker/docker-runc-currentroot 7837 7427 April 24? 00:00:02 / usr/libexec/docker/docker-proxy-current-proto tcp-host-ip 0. 0.0.0-host-port 6868-container-ip 172.17.0.3-container-port 6868root 7852 7431 April 24? 00:00:08 / usr/bin/docker-containerd-shim-current 99b7e7fdbbcd10245672a220154a9a7bc0d9d91a7a7fb641a778e60559089159 / var/run/docker/libcontainerd/99b7e7fdbbcd10245672a220154a9a7bc0d9d91a7a7fb641a778e60559089159 / usr/libexec/docker/docker-runc-currentliujun 19302 19028 0 01:45 pts/0 00:00:00 grep-- color=auto docker

Cause analysis

[liujun@li1581-58 ~] $sudo ls-l / var/run/docker.socksrw-rw---- 1 root docker 0 June 7 01:47 / var/run/docker.sock

When starting docker, use sudo to start, with root permissions, ordinary users do not have the right to access / var/run/docker.sock.

The docker group to which the process belongs

The docker group has setuid permission (see the meaning of srw-rw-- for details)

So you just need to add the user to the docker group.

Resolution steps:

Create a group group

If you don't already have a docker group, add one:

Add current user to docker group

[liujun@li1581-58 ~] $sudo groupadd docker [liujun@li1581-58 ~] $sudo gpasswd-a ${USER} docker is adding user "liujun" to the "docker" group

Restart the docker service

[liujun@li1581-58] $sudo service docker restartRedirecting to / bin/systemctl restart docker.service

Switch session

Newgrp-docker

Because the groups command gets the cached group information

The group information you just added did not take effect, so you need to switch the current session to a new group

Check

[liujun@li1581-58 ~] $docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES99b7e7fdbbcd docker.io/amorphobia/docker-ssserver "/ usr/local/bin/ssser" 3 months ago Up 3 minutes 0.0.0.0 months ago Up 6868-> 6868/tcp boring_roentgen4db3d279d762 docker.io/amorphobia/docker-ssserver "/ usr/local/bin/ssser" 3 months ago Up 3 minutes 0.0 .0.0 9797-> 9797/tcp silly_franklin has finished reading this article I believe you have a certain understanding of "how to execute Docker commands without using sudo". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!

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