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URL title:
CentOS 7开放端口和关闭防火墙 – 一米の白粥舘
URL paragraphs:
永久的开放需要的端口 sudo firewall-cmd --zone=public --add-port=3000/tcp --permanent sudo firewall-cmd --reload 之后检查新的防火墙规则 firewall-cmd --list-all 关闭防火墙 由于只是用于开发环境，所以打算把防火墙关
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