【非常重要】centos7 防火墙【firewall-cmd 常用命令】

参考常用命令：https://www.cnblogs.com/klvchen/p/10063875.html

如果centos系统未安装防火墙，请参考：CentOS 7上安装配置FirewallD防火墙详解https://www.linuxidc.com/Linux/2018-11/155155.htm

更加全面的命令【如果禁止某个ip或ip端访问参考】：https://www.cnblogs.com/Crazy-Liu/p/13527997.html

# 开启防火墙
systemctl start firewalld.service
 
# 防火墙开机启动
systemctl enable firewalld.service
 
# 关闭防火墙
systemctl stop firewalld.service
 
# 查看防火墙状态
firewall-cmd --state
 
# 查看现有的规则
iptables -nL
 
# 重载防火墙配置
firewall-cmd --reload
 
# 添加单个单端口
firewall-cmd --permanent --zone=public --add-port=81/tcp
 
# 添加多个端口
firewall-cmd --permanent --zone=public --add-port=8080-8083/tcp
 
# 删除某个端口
firewall-cmd --permanent --zone=public --remove-port=81/tcp
 
# 针对某个 IP开放端口
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.142.166" port protocol="tcp" port="6379" accept"
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.0.233" accept"
 
# 删除某个IP
firewall-cmd --permanent --remove-rich-rule="rule family="ipv4" source address="192.168.142.166" port protocol="tcp" port="6379" accept"
firewall-cmd --permanent --remove-rich-rule="rule family="ipv4" source address="192.168.1.51" accept"
 
 
# 针对一个ip段访问
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.0.0/16" accept"
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.1.0/24" port protocol="tcp" port="9200" accept"
 
# 添加操作后别忘了执行重载
firewall-cmd --reload

用法2：https://blog.csdn.net/ywd1992/article/details/80401630