CentOS7防火墙
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从CentOS6升级到CentOS7时,防火墙命令已更改,但是我仍然习惯于以前的iptables命令。 本文介绍如何启用iptables规则防火墙。
1.CentOS7自带防火墙关闭
查看防火墙状态(not running代表没开启)
# firewall-cmd --state
not running
停止firewall
# systemctl stop firewalld.service
禁止firewall开机启动
# systemctl disable firewalld.service
2.安装配置iptables
安装
# yum install -y iptables-services
编辑防火墙配置文件
默认规则如下,修改规则保存退出。
# 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-prohibitedCOMMIT
重启防火墙
# systemctl restart iptables.service #最后重启防火墙使配置生效。
3.其他命令
设置防火墙开机启动
# systemctl enable iptables.service
禁止iptables服务
# systemctl disable iptables
暂停服务
# systemctl stop iptables
解除禁止iptables
# systemctl enable iptables
开启服务
# systemctl start iptables