centos6關閉防火牆使用以下命令，
//臨時關閉
service iptables stop
//禁止開機啟動
chkconfig iptables off
stop iptables.service
failed to stop iptables.service: unit iptables.service not loaded.
//臨時關閉
systemctl stop firewalld
//禁止開機啟動
systemctl disable firewalld
removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
removed symlink /etc/systemd/system/dbus-org.fedoraproject.firewalld1.service.
yum install -y iptables-services
//關閉防火牆
service iptables stop
redirecting to /bin/systemctl stop iptables.service
//檢查防火牆狀態
service iptables status
redirecting to /bin/systemctl status iptables.service
鈼iptables.service - ipv4 firewall with iptables
loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled; vendor preset: disabled)
active: inactive (dead)
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