Linux防火墙报错:Failed to start firewalld.service: Unit is masked.
1、故障现象:
启动防火墙失败,报错情况如下:
systemctl start firewalld
# 报错:
Failed to start firewalld.service: Unit is masked.
原因是:(启动防火墙失败:防火墙被锁定)
2、解决方法:
解锁防火墙:(移除符号链接)文章来源:https://www.toymoban.com/news/detail-663652.html
systemctl unmask firewalld.service
# 输出如下信息:
Removed symlink /etc/systemd/system/firewalld.service.
3、再次启动防火墙,查看状态:
systemctl start firewalld.service
systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: active (running) since Mon 2023-08-21 16:53:18 CST; 1s ago
Docs: man:firewalld(1)
.......
Active: active (running) 看到这个已经代表启动防火墙了。文章来源地址https://www.toymoban.com/news/detail-663652.html
4、防火墙命令操作:
- 启动服务操作:
yum install firewalld #安装firewalld 防火墙
systemctl start firewalld.service #开启防火墙
systemctl stop firewalld.service #关闭防火墙
systemctl enable firewalld.service # 设置开机自动启动
firewall-cmd --reload #在不改变状态的条件下重新加载防火墙
- 端口、ip限制:(注意:–permanent 是永久设置,没加则为临时)
#查看firewalld规则:
firewall-cmd --list-all
# 添加单个IP,允许单个IP访问所有端口:
firewall-cmd --permanent --add-source=192.168.18.6
#允许所有ip访问80端口:
firewall-cmd --add-port=80/tcp
# 允许指定IP访问本机8080端口
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.18.72" port protocol="tcp" port="8080" accept'
# 允许指定IP段访问本机8080-8090端口
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.18.0/24" port protocol="tcp" port="8080-8090" accept'
# 禁止指定IP访问本机8080端口
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.18.10" port protocol="tcp" port="8080" reject'
#移除第一条规则(所有的移除规则基本都是add改成remove)
firewall-cmd --permanent --remove-rich-rule='rule family="ipv4" source address="192.168.18.100" port protocol="tcp" port="8080" accept'
- 问题处理:
# 解决firewalld添加ip白名单不生效
firewall-cmd --add-rich-rule='rule family="ipv4" source address="192.168.18.19" accept' --permanent
firewall-cmd --reload
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