標籤:linux centos 網路
[Author]: kwu
CentOS防火牆無法啟動,線上服務器都需要開啟防火牆服務,這是linux系統安全防護最直接有效方式。
1、如果出現
service iptables start
service iptables restart
無法啟動/重啟防火牆時。
2、最佳的方法是修改設定檔
vi /etc/sysconfig/iptables
# 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 -j REJECT --reject-with icmp-host-prohibited-A FORWARD -j REJECT --reject-with icmp-host-prohibitedCOMMIT
然後再啟動防火牆
service iptables start
查看防火牆服務
service iptables status
3、如果需要開啟例外連接埠則,增加如下配置:
vi /etc/sysconfig/iptables
# 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 3306 -j ACCEPT-A INPUT -j REJECT --reject-with icmp-host-prohibited-A FORWARD -j REJECT --reject-with icmp-host-prohibitedCOMMIT
如上,增加了3306服務連接埠
【解決】CentOS防火牆無法啟動的問題