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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
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