從centos6升級到Centos7，防火墻命令變化了，但是還是習慣以前的iptables命令。本文記錄如何開啟iptables規則的防火墻。
1.Centos7自帶防火墻關閉
- 查看防火墻狀態
# firewall-cmd --state
not running
- 停止firewall
# systemctl stop firewalld.service
- 禁止firewall開機啟動
# systemctl disable firewalld.service
2.安裝配置iptables
- 安裝
# yum install -y iptables-services
- 編輯防火墻配置文件
這個是默認規則
# vim /etc/sysconfig/iptables
# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
修改規則保存退出
- 重啟防火墻
# systemctl restart iptables.service #最后重啟防火墻使配置生效
3.其他命令
# 設置防火墻開機啟動
# systemctl enable iptables.service
# 禁止iptables服務
# systemctl disable iptables
# 暫停服務
# systemctl stop iptables
# 解除禁止iptables
# systemctl enable iptables
# 開啟服務
# systemctl start iptables
