1、首先查看目标用户的信息，包括所属组：
◄► id cason
uid=(cason) gid=(cason) groups=(cason),(adm),(cdrom),(sudo),(dip),(plugdev),(lpadmin),(sambashare),(libvirtd)
◄►
2、修改 /etc/sudoers 文件如下（注意红色标记的地方）：
#
# 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" # Host alias specification # User alias specification # Cmnd alias specification # User privilege specification
root ALL=(ALL:ALL) ALL
cason ALL=NOPASSWD: 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
cason ALL=NOPASSWD: ALL # See sudoers() for more information on "#include" directives: #includedir /etc/sudoers.d