First Service

Before we jump into the nitty gritty of creating our first container service let’s see what the end result should look like.

Our doctors-service, along with other service that we will develop later, will need to be deployed to all the containers that we have built, nodeMongo1..3.

Previously we covered the following:

A container is launched by running an image, and an image is an executable package that includes everything needed to run an application. A container is a runtime instance of an image — what the image becomes in memory when executed.

If you wanted to further test your Docker (but we really don’t need to since we have already created mongoNode1..3).

There are 2 images that I really don’t need. <none> (untagged) which is a zombie (dangling in Docker nomenclature), and hello-world, which was to show that Docker works.

If you get an error message such as below, you must also remove the stopped containers which are being referenced by the dangling container.

Get a list of stopped (exited) containers.

I am going to remove the highlighted one

Still there… so

We have removed the dangling containers. To verify:

To create a service we will create an image for the service. From the top level of the doctors-service I will run the following commands (or just run create-image.sh file).

The ‘docker build’ command will call your Dockerfile

So to create the image

Verify that the image was created:

Run the Docker service

Verify it’s running.

If you get the following error, you must update the hosts file of each of your virtualBox vms.

To solve this issue:

Repeat the same for worker1 and worker2 vms.

And for worker 2

If you get the following error, remove any options to mongoose connection call.

In essence mongooseObject.js should change to the following:

Well, we have managed to deploy our service to a single container. That’s because we are running our app in a non-swarm mode.

We have successfully created our first container service. But we still have a very long way to go. In our next exercise we will create a service that can be called from our doctors-service. After all, in real life, services need to communicate with one another.

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