nginx: [emerg] bind() to 0.0.0.0:21140 failed (98: Address already in use)

这个错误信息显示nginx无法在0.0.0.0:21140上绑定（bind）端口，因为该端口已经被占用。要解决这个问题，可以按照以下步骤进行：

1. 使用命令ps -e | grep nginx来查看是否已经启动了nginx。如果nginx已经在运行，可以使用命令sudo service nginx stop来停止nginx服务。

2. 如果nginx没有在运行，那么可以使用netstat命令查看端口0.0.0.0:21140被哪个进程占用了。可以使用命令sudo netstat -tuln | grep 21140来查看。

3. 找到占用该端口的进程后，可以使用kill命令将其终止。命令格式为sudo kill 进程ID。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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