Ubuntu sudo NOPASSWD设置

1、首先查看目标用户的信息，包括所属组：

??  id cason
uid=1000(cason) gid=1000(cason) groups=1000(cason),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),108(lpadmin),124(sambashare),125(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(5) for more information on "#include" directives:

#includedir /etc/sudoers.d