How to debug applications with GDB and pstack inside a native docker container

Issue

• pstack does not print any stack output

  [root@master-0 ~]# docker run --rm -it registry.access.redhat.com/rhscl/nodejs-8-rhel7 bash
  bash-4.2$ 
  bash-4.2$ cat app.js
  var i;
  for (i = 0; true; i++) { 
  }
  bash-4.2$ node --prof app.js &
  bash-4.2$ ps aux
  USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
  default       1  0.0  0.0  11824  1748 ?        Ss   10:28   0:00 bash
  default      18  104  0.1 845464 20168 console  Rl   10:29   2:17 node --prof app.js
  default      47  0.0  0.0  51708  1716 ?        R+   10:31   0:00 ps aux
  bash-4.2$ pstack 18
  bash-4.2$ 
  

• Unable to attach GDB to a running process