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• 启动 Nginx 报错：nginx: [emerg] bind() to 0.0.0.0:8080 failed (48: Address already in use)

• 原因是端口 8080 被使用了，需要换个端口，或者停用掉之前的 8080 端口在重新启用服务器。

Mac 系统

• 方式一：Nginx 将占用的端口换成别的端口

• 方式二：通过命令查看是什么程序占用 8080 端口

  $ sudo lsof -i tcp:8080

  dengzemiaodeMacBook-Pro:~ dengzemiao$ sudo lsof -i tcp:8080COMMAND    PID       USER   FD   TYPE             DEVICE SIZE/OFF NODE NAMEGoogle     391 dengzemiao   24u  IPv4 0xac798c597943e7a7      0t0  TCP localhost:55756->localhost:http-alt (ESTABLISHED)Google     391 dengzemiao   27u  IPv4 0xac798c5982fee7a7      0t0  TCP 10.0.91.252:55757->10.0.91.252:http-alt (ESTABLISHED)Google     391 dengzemiao   37u  IPv4 0xac798c5982f327a7      0t0  TCP localhost:60006->localhost:http-alt (ESTABLISHED)Google     391 dengzemiao   46u  IPv4 0xac798c597b415127      0t0  TCP localhost:61210->localhost:http-alt (ESTABLISHED)QQ         722 dengzemiao   14u  IPv4 0xac798c5982f50127      0t0  TCP 10.0.91.252:53674->153.3.50.86:http-alt (ESTABLISHED)QQ         722 dengzemiao   16u  IPv4 0xac798c5982f50127      0t0  TCP 10.0.91.252:53674->153.3.50.86:http-alt (ESTABLISHED)node      4074 dengzemiao   25u  IPv4 0xac798c5984169da7      0t0  TCP *:http-alt (LISTEN)node      4074 dengzemiao   47u  IPv4 0xac798c5982ff0427      0t0  TCP localhost:http-alt->localhost:60006 (ESTABLISHED)node      4074 dengzemiao   48u  IPv4 0xac798c5978f5f127      0t0  TCP localhost:http-alt->localhost:61210 (ESTABLISHED)node      4074 dengzemiao   54u  IPv4 0xac798c598003caa7      0t0  TCP localhost:http-alt->localhost:55756 (ESTABLISHED)node      4074 dengzemiao   55u  IPv4 0xac798c5978f627a7      0t0  TCP 10.0.91.252:http-alt->10.0.91.252:55757 (ESTABLISHED)

  输出发现有 Google、QQ、node 占用着 8080 端口。

  如果不是什么特殊的程序，直接通过命令移除一下

  $ sudo kill PID例如：$ sudo kill 391也可以同时清理多个PID：$ sudo kill 391 722 4074

  移除之后在运行 $ nginx 再次启动，如果有特殊软件或者不知道该不该关，那就 nginx 先换个端口用也一样。

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