Port Forwarding fail?

Docker Desktop
1

Expected behavior

Expected to be able to reach to my service in docker

Actual behavior

Unable to reach to my service in docker

Steps to reproduce the behavior

  1. docker run -d -p 127.0.0.1:9292:9292 my_app
  2. get into my docker by using “docker-machine ssh default” and "sudo docker exec -i -t {containter_id} bash
  3. verified that my_app is indeed running
    USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
    root 1 0.0 5.7 185332 58716 ? Ssl 00:53 0:01 ruby /usr/local/bundle/bin/rackup <— my_app
    root 7 0.4 0.3 20220 3188 ? Ss 01:26 0:00 bash
    root 12 0.0 0.2 17492 2160 ? R+ 01:26 0:00 ps aux
  4. verified that I am able to make post to my service in container in bash
  5. run docker ps and unable to reach to my service
    docker ps
    CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
    d5aa8769b845 my_app “/bin/sh -c rackup” 3 seconds ago Up 2 seconds 127.0.0.1:9292->9292/tcp goofy_snyder
    98de66a308b4 nginx “nginx -g 'daemon off” 7 hours ago Up 7 hours 443/tcp, 0.0.0.0:8000->80/tcp happy_almeida

try to localhost:9292 it will not work, however localhost:8000 works just fine

I wonder if there’s something wrong that I did by looking at PORTS since they are different… Can someone please provide me a hint?