Question

How to run multiple containers of the same image and expose different ports?

Posted April 15, 2020 1.8k views
Docker

Dear community,

I have built a droplet with Ubuntu 18.04 and Docker CE edition. For teaching purposes, I want to run 18 times the same container based on a Docker image hosted on DockerHub: https://hub.docker.com/repository/docker/scienceparkstudygroup/master-gls

When I run one container and expose it on the 8787 port, everything runs smoothly and I can access the RStudio instance at my droplet IP address + :8787.

docker run --rm --name rstudio -e PASSWORD=mypwd -p 8787:8787 scienceparkstudygroup/master-gls:openr-latest

My problem is to create multiple instances of the same container but expose it to different ports. I have tried Docker-compose but no success so far.

Any idea?
In advance thank you
Marc

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2 answers

Hi there @mgalland,

You would just need to adjust the -p argument and change the first part from 8787 to the new port that you would like to use.

For example:

  • Starting the first container on port 8787:
  • docker run --rm --name rstudio-1 -e PASSWORD=mypwd -p 8787:8787 scienceparkstudygroup/master-gls:openr-latest
  • Starting the second container on port 8788:
  • docker run --rm --name rstudio-2 -e PASSWORD=mypwd -p 8788:8787 scienceparkstudygroup/master-gls:openr-latest

Note: Make sure to use different names as well otherwise it would not work.

Hope that this helps!
Regards,
Bobby

Hello bobby
Thank you, it worked like a charm.
I am now running my containers with the --detach option. Still struggling a bit to mount a volume within my machine for each container but I’ll probably figure this out myself.
Thanks again
marc

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