linux设置sudo不要密码

linux下，普通用户，sudo时需要密码

改成没密码，

vi /etc/sudoers

在 root ALL=(ALL) ALL后加一行

sysusr ALL=(ALL) NOPASSWD: ALL　　（92行）

有时将用户设了nopasswd，但无效，原因是被后面的group的设置覆盖了，需要把group的设置也改为nopasswd。

sysusr账号所在组（wheel）：见102行，%wheel，设置用户组sudo不加密，保存即可生效。

　　　...
     81 ## Next comes the main part: which users can run what software on
     82 ## which machines (the sudoers file can be shared between multiple
     83 ## systems).
     84 ## Syntax:
     85 ##
     86 ##      user    MACHINE=COMMANDS
     87 ##
     88 ## The COMMANDS section may have other options added to it.
     89 ##
     90 ## Allow root to run any commands anywhere
     91 root ALL=(ALL) ALL
     92 sysusr ALL=(ALL) NOPASSWD: ALL
     93 
     94 ## Allows members of the 'sys' group to run networking, software,
     95 ## service management apps and more.
     96 # %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS
     97 
     98 ## Allows people in group wheel to run all commands
     99 %wheel ALL=(ALL) ALL
    100 
    101 ## Same thing without a password
    102 # %wheel        ALL=(ALL)       NOPASSWD: ALL //这一行的#要放开，效果上，覆盖99行的设置
    103 
    104 ## Allows members of the users group to mount and unmount the
    105 ## cdrom as root
    106 # %users  ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom
    107 
    108 ## Allows members of the users group to shutdown this system
    109 # %users  localhost=/sbin/shutdown -h now
    110 
    111 ## Read drop-in files from /etc/sudoers.d (the # here does not mean a comment)
    112 #includedir /etc/sudoers.d

 附录：查看用户所在组的两个方式：

1.groups命令

[sysusr@GCOS 12:15:58]$ groups
sysusr wheel service
<~>

2.查看/etc/group

[sysusr@GCOS 12:18:49]$ cat /etc/group|grep sysusr
wheel:x:10:sysusr
sysusr:x:1000:service,postgres,mysql,nginx,apache
service:x:2000:sysusr,postgres,mysql,nginx,apache
<~>

 参考：

设置su和sudo为不需要密码