1，根据端口号查看进程PID Isof
> lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
AliYunDun 1441 root 28u IPv4 284034050 0t0 TCP izbp1ierao41xx0raqqt6mz:52358->100.100.30.26:http (ESTABLISHED)
nginx 8885 root 6u IPv4 152256714 0t0 TCP *:http (LISTEN)
nginx 22736 root 6u IPv4 152256714 0t0 TCP *:http (LISTEN)
nginx 22737 root 6u IPv4 152256714 0t0 TCP *:http (LISTEN)
nginx 22737 root 13u IPv4 294831122 0t0 TCP izbp1ierao41xx0raqqt6mz:http->114.93.31.70:36690 (ESTABLISHED)
nginx 22738 root 6u IPv4 152256714 0t0 TCP *:http (LISTEN)
2，netstat去查看端口占用
> netstat -nlp | grep :80
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 8885/nginx: master
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 8885/nginx: master
tcp 0 0 0.0.0.0:8020 0.0.0.0:* LISTEN 8885/nginx: master
tcp6 0 0 :::8030 :::* LISTEN 32723/node
获取到 PID 8885
3，通过PID 获取到执行的详细信息
> ps -ef | grep 8885
root 8885 1 0 2019 ? 00:00:00 nginx: master process ./nginx -c /app/nginx/conf/nginx.conf
root 22736 8885 0 2019 ? 00:00:05 nginx: worker process
root 22737 8885 0 2019 ? 00:00:15 nginx: worker process
root 22738 8885 0 2019 ? 00:00:42 nginx: worker process
root 22739 8885 0 2019 ? 00:00:23 nginx: worker process
root 27499 21765 0 16:54 pts/0 00:00:00 grep --color=auto 8885
[root@izbp1ierao41xx0raqqt6mz app]#
看到执行住主进程和执行脚本 ./nginx -c /app/nginx/conf/nginx.conf r
