問題：Centos7 配置systemctl的Nginx啟動服務，start一直卡着，stop不生效
發現以下問題
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啟動Nginx時一直卡着不動在 Starting nginx (via systemctl):
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實際端口是開啟了
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必須通過Ctrl + C強制關閉
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關閉Nginx時，提示成功，但是端口沒關閉
查看Nginx 狀態日志如下
[root@xxx nginx-1.17.2]# systemctl status nginx
● nginx.service - SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server
Loaded: loaded (/etc/rc.d/init.d/nginx; bad; vendor preset: disabled)
Active: inactive (dead) since Thu 2019-08-08 05:37:04 EDT; 2min 15s ago
Docs: man:systemd-sysv-generator(8)
CGroup: /system.slice/nginx.service
├─21402 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
└─21403 nginx: worker process
Aug 08 05:36:50 10-0-94-90 systemd[1]: Starting SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server...
Aug 08 05:36:50 10-0-94-90 nginx[21393]: Starting nginx: [ OK ]
Aug 08 05:36:50 10-0-94-90 systemd[1]: PID file /usr/local/nginx/logs/nginx.pid not readable (yet?) after start.
Aug 08 05:37:04 10-0-94-90 systemd[1]: Stopped SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server.
如上PID文件位置不對，修改PID文件路徑即可解決上面問題