We just went over creating a Docker image for our application. We saw how easy and fast it is to start a container using Docker. This is a very transformative experience compared to using only virtual machine technologies, such as EC2.
One possibility that we haven't explicitly mentioned so far is that you can start multiple containers with the same image.
We can, for example, start our helloworld container five times, binding five different ports using the following command (adapt the ID based on the image ID you built. If needed, run docker images to find its ID):
$ for p in {3001..3005}; do docker run -d -p ${p}:3000 e7deb47c0528; done
32631a70b37ab827de39d57fd1d415339202779cf8e16963791980dc9212680a
ad69359b9630446700cbf515c67bd8d5e9de461542de7f6f0614045f36be427f
fad5b94bb1d10a31304348b086a95e0bb82d2ee944b3f75ce64b06af0ccf2353
cd0819ce968c497f9002b47a503f315d8494cb615e88b31029504bf6bd4f2630...
