CentOS 7.0默认使用的是firewall作为防火墙。
常用firewall命令
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systemctl stop firewalld.service #停止firewall
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systemctl disable firewalld.service #禁止firewall开机启动
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firewall-cmd -- state #查看默认防火墙状态（关闭后显示notrunning，开启后显示running）
操作示例
查看防火墙状态
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[hoegh@localhost Desktop]$ firewall-cmd --state
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running
关闭防火墙
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[hoegh@localhost Desktop]$ systemctl stop firewalld.service
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PolicyKit daemon disconnected from the bus.
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We are no longer a registered authentication agent.
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PolicyKit daemon reconnected to bus.
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Attempting to re-register as an authentication agent.
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We are now a registered authentication agent.
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[hoegh@localhost Desktop]$
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[hoegh@localhost Desktop]$ firewall-cmd --state
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not running
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[hoegh@localhost Desktop]$
禁止自动启动
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[hoegh@localhost Desktop]$
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[hoegh@localhost Desktop]$ systemctl disable firewalld.service
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Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
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Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
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[hoegh@localhost Desktop]$
~~~~~~~ the end~~~~~~~~~
hoegh
2017.11.3
