Minikube: Deploying Microservices

Run the command:

sudo minikube start --vm-driver none

In the user's home directory, there is a robot-shop directory, and within it a K8s subdirectory. Let's get into it:

cd ~/robot-shop/K8s

Now that we're there, we can create a namespace for the resources:

sudo kubectl create namespace robot-shop

Then we can create the resources in the namespace:

sudo kubectl -n robot-shop apply -f ./descriptors/

Let's monitor the pods to ensure that they come up:

sudo kubectl -n robot-shop get po -w

Once all of the pods have come up this task is complete.

Let's take a closer look at the web service:

sudo kubectl -n robot-shop get svc web

Its TYPE is currently LoadBalancer, and that's not what we want here. We need to edit the web service and change its type to NodePort:

sudo kubectl -n robot-shop edit svc web

We'll land in a vim session. The spec section should look like this (minus the comments) when we're done:

spec:
 ports:
 - name: "8080"
   port: 8080
   protocol: TCP
   targetPort: 8080
   nodePort: 30080    <-- ensure that the nodePort it set to this value
 selector:
   service: web
 sessionAffinity: None
 type: NodePort    <---- change from LoadBalancer

Now let's take another look at the web service:

sudo kubectl -n robot-shop get svc web

Its TYPE should be NodePort now.

Now let's get the URL of the web service:

sudo minikube service list

We need the TARGET_PORT of the web service for this next step. We've got to edit the Nginx configuration and set the port forwarding to the NodePort URL:

sudo vim /etc/nginx/sites-enabled/default


    location / {
               # First attempt to serve request as file, then
               # as directory, then fall back to displaying a 404.
               proxy_pass http://<minikube IP>:<svc port>;

Once that's done, we can restart Nginx:

sudo systemctl restart nginx

Finally, we can test in a web browser. If we exit in the terminal, we'll get the server's public IP. We can also get it from the hands-on lab overview page. But browse to it, and we should see the robot-shop application up and running. Feel free to tool around and look at the different robots. If you can, it means we're through setting things up.