1、 ：vi /etc/sysconfig/iptables
7022
-A INPUT -m state --state NEW -m tcp -p tcp --dport 7022 -j ACCEPT
======================================================================
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 7022 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
, :
/etc/init.d/iptables restart
service iptables restart
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2、 ssh
cp /etc/ssh/ssh_config /etc/ssh/ssh_configbak
cp /etc/ssh/sshd_config /etc/ssh/sshd_configbak
ssh ：7022
vi /etc/ssh/sshd_config
#Port 22 Port 7022
vi /etc/ssh/ssh_config
#Port 22 Port 7022
：/etc/init.d/sshd restart
service sshd restart
7022 ， 。 22 ， ssh 7022 ！ 。
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3、 root ssh
vi /etc/ssh/sshd_config
PermitRootLogin， yes no， # ， root ！
， root su root root
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4、 SSH
root，user1 user2 SSH ， sshd_config
vi /etc/ssh/sshd_config
AllowUsers rootuser1user2
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5、
ssh ， 。
sshd_config , 。
vi /etc/ssh/sshd_config
ClientAliveInterval 600
ClientAliveCountMax 0
600 ， 10 ，
， （ / ）。
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6、 IP
vi /etc/hosts.deny # sshd:ALL
vi /etc/hosts.allow # ：sshd:192.168.1.1 #( 192.168.1.1 IP )
ssh ：/etc/init.d/sshd restart