[root@localhost ~]# ls -l `whereis sudo`

---s--x--x. 2 root root 186800 Sep  1  2010 /usr/bin/sudo

-rw-r--r--. 2 root root  11296 Sep  1  2010 /usr/share/man/man8/sudo.8.gz

若没安装,自行下载rpm或者源码进行安装

增加配置 允许rhel 不输入密码就 sudo到root

[root@localhost ~]# grep NOPASSWD /etc/sudoers

# %wheel ALL=(ALL) NOPASSWD: ALL

rhel  ALL=(ALL)       NOPASSWD: ALL

验证:

[root@localhost ~]# id

uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[root@localhost ~]# su - rhel

[rhel@localhost ~]$ id

uid=500(rhel) gid=500(rhel) groups=500(rhel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[rhel@localhost ~]$ sudo -u root -s

[root@localhost rhel]# id

uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[root@localhost rhel]# sudo -l

Matching Defaults entries for root on this host:

requiretty, always_set_home, env_reset, env_keep="COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR USERNAME

LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER

LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin

User root may run the following commands on this host:

(ALL) ALL

初略配置完毕!