centos7 防火牆

啓動防火牆：systemctl start firewalld.servicejavascript 關閉防火牆：systemctl stop firewalld.servicejava 重啓防火牆：systemctl restart firewalld.servicepython 顯示防火牆服務狀態：systemctl status firewalld.servicedocker 在開機時啓用防火

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