Those things about nginx services and corresponding ports

Gracefully restart the nginx service and find an error:

[root@web01 conf]# /application/nginx/sbin/nginx -s reload
nginx: [error] open() "/application/nginx-1.6.3//logs/nginx.pid" failed (2: No such file or directory)

    经过查看nginx服务未启动导致的，-s reload平滑优雅重启必须在nginx服务启动的状态才可以重启，就好像电脑还没有开机，你根本找不到重启的按钮。重启是建立在已经启动的状态的。



    判断nginx服务器是否启动？

1 Determine whether there is a process corresponding to the nginx service, as shown in the figure below to view the process corresponding to the nginx service

[root@web01 conf]# ps -ef|grep nginx

root       1437   1313  0 10:36 pts/1    00:00:00 grep nginx

2 According to whether there is monitoring on the port corresponding to the nginx service

[root@web01 conf]# lsof -i :80
[root@web01 conf]#
[root@web01 conf]# netstat -lntup|grep nginx
[root@web01 conf]#
[root@web01 conf]# netstat -lntup|grep 80
[root@web01 conf]#

Check after starting nginx service:

[root@web01 conf]# /application/nginx/sbin/nginx
Check whether the nginx process exists:

[root@web01 conf]# ps -ef|grep nginx

root       1444      1  0 10:40 ?        00:00:00 nginx: master process /application/nginx/sbin/nginx
www        1445   1444  0 10:40 ?        00:00:00 nginx: worker process        
root       1456   1313  0 10:40 pts/1    00:00:00 grep nginx

[root@web01 conf]#Check
if the port exists:
[root@web01 conf]# lsof -i :80

COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
nginx   1444 root    6u  IPv4  12531      0t0  TCP *:http (LISTEN)
nginx   1445  www    6u  IPv4  12531      0t0  TCP *:http (LISTEN)

[root@web01 conf]# netstat -lntup|grep nginx

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      1444/nginx          
tcp        0      0 0.0.0.0:81                  0.0.0.0:*                   LISTEN      1444/nginx          
tcp        0      0 0.0.0.0:82                  0.0.0.0:*                   LISTEN      1444/nginx

[root@web01 conf]# netstat -lntup|grep 80

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      1444/nginx

[root@web01 conf]# netstat -lntup|grep 81
tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 1444/nginx
[root@web01 conf]# netstat -lntup|grep 82

tcp        0      0 0.0.0.0:82                  0.0.0.0:*                   LISTEN      1444/nginx

At present, the nginx service has been determined to start, so if you continue to perform graceful restart, no error will be reported.

[root@web01 conf]# /application/nginx/sbin/nginx -s reload
[root@web01 conf]#

Those things about nginx services and corresponding ports

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