I have implemented an API inside a docker container and I want to deploy this container to a remote ubuntu server. How can I do that exactly? My API uses many resources and I have used MLDB framework to implement it. I want to deploy the container containing the API on this remote ubuntu server. So far, I have found many guides to deploy the API on AWS and DigitalOcean, but since I already have access to a remote ubuntu server than I don't need those right? So how can I deploy my container in order for someone else to be able to test my API? If there is a better way to deploy my API (hopefully for free or with cheap cost) then please let me know.

Thanks in advance.

Since the release of Docker 18.09.0 this has got a whole lot easier. This release added support for the ssh protocol to the DOCKER_HOST environment variable and the -H argument to docker ... commands respectively.

First of all, you'll need SSH access to the target machine (which you'll probably need with any approach).

Then, either:

# Re-direct to remote environment.
export DOCKER_HOST="ssh://my-user@remote-host"
Run a container. To prove that we are on remote-host, this will print its hostname.
docker run –rm –net host busybox hostname -f
All docker commands here will be run on remote-host.
Switch back to your local environment.
unset DOCKER_HOST

Or, if you prefer, all in one go for one command only:

docker -H "ssh://my-user@remote-host" run --rm --net host busybox hostname -f

Note that this is not yet supported in docker-compose v.1.23.1 (latest version as of writing) and below. However, it will be part of the next release.