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一、CentOS6和CentOS7防火墙的区别
* 使用的防火墙工具不一样：CentOS6自带的防火墙工具是iptables，CentOS7自带的防火墙工具是firewall。
* iptables是用于过滤数据包，属于网络层防火墙
* firewall能够允许一些服务可用，一些端口可用，属于更高一层的防火墙
二、常用命令
* iptables防火墙常用命令 service iptables status #查询防火墙状态 service iptables stop
#关闭防火墙 service iptables start #开启防火墙 service iptables restart #重启防火墙 chkconfig
iptables off #永久关闭防火墙 chkconfig iptables on #永久关闭后开启防火墙 iptables -L
--line-numbers #查询当前iptables的规则 -A INPUT -p tcp --dport 22 -j ACCEPT #开放端口 -A
INPUT -p tcp --dport 22 -j DROP
* 如果/etc/sysconfig/iptables文件不存在，可以按如下方式配置一条防火墙规则：
使用iptables命令随便写一条防火墙规则：iptables -P OUTPUT ACCEPT，然后使用service iptables save
进行保存，默认就保存到了/etc/sysconfig目录下的iptables文件中。
* firewall防火墙常用命令 firewall-cmd --state #查看防火墙状态 systemctl start firewalld
#启动防火墙 systemctl stop firewalld #关闭防火墙 firewall-cmd --permanent --zone=public
--list-ports #检查防火墙开放的端口 firewall-cmd --permanent --zone=public
--add-port=8080/tcp --permanent #开放一个新的端口 firewall-cmd --reload #重启防火墙
firewall-cmd --zone=public --query-port=8080/tcp #验证新增加端口是否生效 systemctl enable
firewalld service #防火墙开机自启动 firewall-cmd --zone=public --remove-port=9200/tcp
--permanent #防火墙取消某以开放端口
