Kubernetes App With Load Balancer Creation
Kubernetes Cluster Creation With Load balancer
During my Cloud studies I learned about what Kubernetes clusters is and what it is used for, however recently through following senior professionals I have realised the best way to learn is to make these environments yourself so that’s what I attempted this weekend.
Firstly, What is Kubernetes? Kubernetes also known as K8s, is an open-source system for automating deployment, scaling, and management of containerized applications. Their capabilities and theory behind them can get quite advanced and complicated. For this test I just created a simple example of how they can be put into practice.
To Start. I configured a Kubernetes cluster on Linode which created a set of 3, 2GB nodes in a cluster, basically 3 ‘worker’ computers that link to the master node. The master node is what you interact with to configure. We do this through the KubeCTL application which I installed on my local Kali Linux VM. When creating a cluster on a cloud provider, it can generate a YAML file for you to connect straight to your instance through that KubeCTL app. For this demonstration it will just be hosting a test image i found on the web.
As we can see above the YAML file was created and confirmed our pods are connected. I then created another YAML file based off an online template to configure load balancing for any nodes hosted on the ‘testapp’ see code below.
apiVersion: v1
kind: Service
metadata:
name: webapp-service
spec:
type: LoadBalancer
selector:
app: Harrisontest
ports:
- protocol: TCP
port: 80
targetPort: 8080Finally, to confirm the load balancer was running, I went onto Linode to see that it was up in their load balancer section.
Now I can see the load balancer is up this confirms the Load Balancer is up and the site is accessible.
-To summarize. I created a Kubernetes cluster in Linode, before installing KubeCTL on Kali in order to connect to the master node that was created to host the test image, then configure it to load balance that image across the 3 nodes.
This was a very basic K8 project but a great introduction to containers, load balancing and availability.