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markdown-file/CentOS6-and-CentOS7.md

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### 开放端口
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- 一般设置软件端口有一个原则:
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- 0 ~ 1024 系统保留,一般不要用到
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- 1024 ~ 65535(2^16) 可以随意用
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- 添加单个端口:`firewall-cmd --zone=public --add-port=8883/tcp --permanent`
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- 添加范围端口:`firewall-cmd --zone=public --add-port=8883-8885/tcp --permanent`
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- 删除端口:`firewall-cmd --zone=public --remove-port=8883/tcp --permanent`

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