Can docker be started without root permissions?

Docker cannot be started without root permissions; root permissions are required to use docker. Ordinary users without root permissions will not be able to operate docker. If ordinary users do not have root permissions, they can use sudo to obtain administrator permissions and run docker. command, or add the current user to the docker user group, then the current user has permission to access the "Unix socket" and can execute docker related commands.

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

Can docker be started with non-root permissions?

Docker cannot be started with non-root permissions

Docker requires root permissions. If you do not have root permissions, Ordinary users will not be able to operate docker. Two modified methods are given below to complete the operation requests of ordinary users.

Solution

1. Grant ordinary users root permissions

Requires modification:/etc /sudoers

# 现在是不可更改的，需要调整权限：chmod 0755 sudoers (需要root权限的)
root@SRV252:/etc# ll sudoers
-r--r----- 1 root root 815 Feb 23 13:06 sudoers

Modify the following contents in the sudoers file

# User privilege specification
root    ALL=(ALL:ALL) ALL
name1  ALL=(ALL:ALL) ALL # 使用sudo时，仍需要密码的
name2   ALL=(ALL:ALL) NOPASSWD: ALL # 使用sudo时候，不要密码（免密的）

Ordinary users can use docker

2. If the docker group

After docker is installed, a docker group will be created by default. The docker group has read socket permissions, so add the ordinary user to the docker group. All users in this group will have access to unix sockets. Finally, refresh the user's Just the initial group.

2.1 Check if there is a docker user

test@ubuntu:~$ sudo cat /etc/group |grep docker
docker:x:999:  # 表示存在

If not, you need to add it manually

sudo groupadd docker

2.2 Check the properties of /var/run/docker.sock

If The user group of /var/run/docker.sock is not docker, but root and needs to be modified using chgrp.

# ll /var/run/docker.sock
srw-rw---- 1 root root 0 Oct 29 22:20 /var/run/docker.sock=
chgrp docker /var/run/docker.sock=

2.3 Add ordinary users to the docker group

# 添加
test@:~$ sudo gpasswd -a test docker
Adding user test to group docker
# 查看，此时不在，需要刷新
test@ubuntu:~$ id
uid=1002(test) gid=1002(test) groups=1002(test)
# 刷新
test@ubuntu:~$ newgrp docker

Recommended learning: "docker video tutorial"

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