SSH--只允许个别用户登陆SSH

1）编辑/etc/pam.d/sshd   
在文件内加入auth       required     pam_listfile.so item=user sense=allow file=/etc/sshusers onerr=fail

[root@book ~]# vi /etc/pam.d/sshd
#%PAM-1.0
auth       required     pam_stack.so service=system-auth
auth       required     pam_nologin.so
auth       required     pam_listfile.so item=user sense=allow file=/etc/sshusers onerr=fail
account    required     pam_stack.so service=system-auth
password   required     pam_stack.so service=system-auth
session    required     pam_stack.so service=system-auth

2）建立/etc/sshusers文件
[root@book ~]# touch /etc/sshusers

3）把允许登陆的用户加入到 /etc/sshusers

echo "root" >> /etc/sshusers
echo "admin_cnscn" >> /etc/sshusers
...

则以后只有root和admin_cnscn可以登陆ssh