1、
nginx: [error] open() "/var/run/nginx.pid" failed (2: No such file or directory)
解决：
[root@TEST nginx]# sudo nginx -c /etc/nginx/nginx.conf
[root@TEST nginx]# nginx -s reload
2、
[root@nginx nginx]# curl http://127.0.0.1:8089
<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.12.2</center>
</body>
</html>
解决：
nginx的端口开了， 远端的防火墙关了就可以
3、
[root@nginx conf.d]# !n
nginx -s reload
nginx: [alert] kill(2692, 1) failed (3: No such process)
解决;
[root@nginx conf.d]# whereis nginx
nginx: /etc/nginx /usr/local/sbin/nginx /usr/local/nginx
[root@nginx conf.d]# /usr/local/sbin/nginx
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:58016 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 0.0.0.0:58016 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 0.0.0.0:58016 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 0.0.0.0:58016 failed (98: Address already in use)
端口冲突了，修改下端口； 然后杀掉，58016这个进程， 再重启nginx
