netns查看容器内端口使用情况

[root@master ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND                  CREATED              STATUS              PORTS                               NAMES
ba9b9a977c02   nginx     "/docker-entrypoint.…"   About a minute ago   Up About a minute   0.0.0.0:80->80/tcp, :::80->80/tcp   nginx

[root@master ~]# docker inspect ba | grep Pid
            "Pid": 31889,
            "PidMode": "",
            "PidsLimit": null,

[root@master ~]# mkdir -p /var/run/netns
[root@master ~]# ln -s /proc/31889/ns/net /var/run/netns/ba9b9a977c02

[root@master ~]# ip netns
ba9b9a977c02 (id: 0)
[root@master ~]# ip netns exec ba9b9a977c02 netstat -anptul | grep 80
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      31889/nginx: master
tcp6       0      0 :::80                   :::*                    LISTEN      31889/nginx: master