Using nsenter and docker

gistfile1.txt

/ # root@precise64:~/util-linux# docker ps
ID                  IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
71546cef7b56        busybox:latest      sleep 3600          16 minutes ago      Up 16 minutes                           pink_monkey
root@precise64:~/util-linux# docker inspect 71546cef7b56 | grep Pid
        "Pid": 10614,
root@precise64:~/util-linux# ./nsenter  --mount -t 10621 /usr/bin/sh


BusyBox v1.19.3 (Ubuntu 1:1.19.3-7ubuntu1.1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/ # ps
PID   USER     COMMAND
    1 root     sleep 3600