In this dockerfile, we have:

EXPOSE 5000
RUN gunicorn --bind 0.0.0.0:5000
RUN /usr/sbin/nginx

However, when I do from docker running image:

root@594ac39e8115:/# ps -x

I get

PID TTY      STAT   TIME COMMAND
      1 pts/0    Ss     0:00 bash
     10 pts/0    R+     0:00 ps -x

But if I run:

root@594ac39e8115:/# gunicorn --bind 0.0.0.0:5000 && /usr/sbin/nginx

I get:

PID TTY      STAT   TIME COMMAND
      1 pts/0    Ss     0:00 bash
     15 ?        S      0:00 /usr/bin/python3 /usr/local/bin/gunicorn --bind 0.0.0.0:5000
     16 ?        Ss     0:00 nginx: master process /usr/sbin/nginx
     26 ?        S      0:02 /usr/bin/python3 /usr/local/bin/gunicorn --bind 0.0.0.0:5000
     27 ?        S      0:02 /usr/bin/python3 /usr/local/bin/gunicorn --bind 0.0.0.0:5000
     28 ?        S      0:02 /usr/bin/python3 /usr/local/bin/gunicorn --bind 0.0.0.0:5000
     29 ?        S      0:02 /usr/bin/python3 /usr/local/bin/gunicorn --bind 0.0.0.0:5000
    314 pts/0    R+     0:00 ps -x

And the app replies to curl requests.

Why isn't the dockerfile able to correctly initialize the gunicorn instances and nginx reverse proxy server?