docker view port occupied process

After finding the corresponding process or container, you can stop or delete the process or container

Now I want to start a docker container and map port 80 in the container to the host.

[root@cmdb2 ~]# docker run -p 80:80  -it 9d1c954badc7 /bin/bash

[root@cmdb2 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                NAMES
870ac9aaf081        9d1c954badc7        "/bin/bash"         3 minutes ago       Up 3 minutes        0.0.0.0:80->80/tcp   adoring_mestorf

[root@cmdb2 ~]# lsof -i:80
COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 7056 root    4u  IPv6 128759      0t0  TCP *:http (LISTEN)

[root@cmdb2 ~]# netstat -antp|grep 80
tcp6       0      0 :::80                   :::*                    LISTEN      7056/docker-proxy

[root@cmdb2 ~]# docker run -p 80:80  -it 9d1c954badc7 /bin/bash
docker: Error response from daemon: driver failed programming external connectivity on endpoint romantic_wing (d5fd42844e1838b26c123b002b6c0f5f3aaadcd7e8e8ff922cb2c23c33891bf4): Bind for 0.0.0.0:80 failed: port is already allocated.

Further reading:

lsof under centos7 needs to be installed separately:

yum install lsof

Original: https://www.jianshu.com/p/5a07851df2cd