CentOS7.5查看防火牆狀態，啓動，關閉防火牆

CentOS 7.0默認使用的是firewall做爲防火牆 查看防火牆狀態3d firewall-cmd --state     中止firewallcode systemctl stop firewalld.service     啓動firewallblog   禁止firewall開機啓動cmd systemctl disable firewalld.service

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