linux - lsof 的使用

之前用的比较多的是　

查看运行在某端口的进程

sudo lsof -i:3306  就可以知道跑在3306 端口上的进程了．

现在遇到个问题   mysql8 看不到端口在哪里. 

所以根据这里:   https://unix.stackexchange.com/questions/278400/how-to-know-which-ports-are-listened-by-certain-pid

根据进程pid 查询占用端口号: 

sudo lsof -aPi -p <pid>  

就可以看到对应的端口号.  (在我的本机很好使)

siwei@siweii5:/workspace/old_server_backup_2021-01-16$ sudo lsof -i:80
[sudo] password for siwei: 
COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
nginx   1002     root    6u  IPv4  29356      0t0  TCP *:http (LISTEN)
nginx   1002     root    7u  IPv6  29357      0t0  TCP *:http (LISTEN)
nginx   1003 www-data    6u  IPv4  29356      0t0  TCP *:http (LISTEN)
nginx   1003 www-data    7u  IPv6  29357      0t0  TCP *:http (LISTEN)
nginx   1004 www-data    6u  IPv4  29356      0t0  TCP *:http (LISTEN)
nginx   1004 www-data    7u  IPv6  29357      0t0  TCP *:http (LISTEN)
nginx   1005 www-data    6u  IPv4  29356      0t0  TCP *:http (LISTEN)
nginx   1005 www-data    7u  IPv6  29357      0t0  TCP *:http (LISTEN)
nginx   1006 www-data    6u  IPv4  29356      0t0  TCP *:http (LISTEN)
nginx   1006 www-data    7u  IPv6  29357      0t0  TCP *:http (LISTEN)
siwei@siweii5:/workspace/old_server_backup_2021-01-16$ sudo su
root@siweii5:/workspace/old_server_backup_2021-01-16# lsof -aPi -p 1003
COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
nginx   1003 www-data    6u  IPv4  29356      0t0  TCP *:80 (LISTEN)
nginx   1003 www-data    7u  IPv6  29357      0t0  TCP *:80 (LISTEN)
root@siweii5:/workspace/old_server_backup_2021-01-16# sudo lsof -i:3306
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
mysqld  1079 mysql   34u  IPv4  32233      0t0  TCP *:mysql (LISTEN)
root@siweii5:/workspace/old_server_backup_2021-01-16# lsof -aPi -p 1079
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
mysqld  1079 mysql   34u  IPv4  32233      0t0  TCP *:3306 (LISTEN)