ubuntu添加用户并给予sudo权限

1、创建用户

root@10s:~# adduser mysql

root@10s:~# adduser mysql
Adding user `mysql' ...
Adding new group `mysql' (1001) ...
Adding new user `mysql' (1001) with group `mysql' ...
Creating home directory `/home/mysql' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for mysql
Enter the new value, or press ENTER for the default
	Full Name []: mysql
	Room Number []: mysql
	Work Phone []: 110
	Home Phone []: 110
	Other []: 
Is the information correct? [Y/n] y
root@10s:~# 

2、让用户拥有sudo权限，可自由切换到root

root@10s:~# chmod u+w /etc/sudoers 

root@10s:~# vi /etc/sudoers  

添加 mysql   ALL=(ALL:ALL) ALL

#
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL
mysql   ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# See sudoers(5) for more information on "#include" directives:

#includedir /etc/sudoers.d