nginx启动报错，信息如下：

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

一.Nginx没有关闭
killall -9 nginx
ps ef|grep nginx，未发现有nginx进程说明已经关闭
重启还报错，那么进行下面处理

二.其他程序占用地址
1.查看80端口占用情况
netstat -ntpl
2.杀掉占用80端口的进程
kill -9 $pid //这个$pid就是端口

重启可以成功。