Pre-requisite: GCP
In this article, we are going to see how we can create a Google Kubernetes Engine Cluster for deploying a Containerized application. We are also going to see how we can deploy a containerized application in this cluster. We will use a simple application by GCP (Google Cloud Platform) which runs through an NGINX server. So, let’s get to it.
GKE Cluster: Google Kubernetes Engine Cluster is a collection of VM nodes, and a Master Node called a Cluster control plane. The master node handles the worker nodes while the application is run by worker nodes.
Container: A container is a small package of applications with its dependencies.
Containerized Application: Containerized application is software that runs in isolated containers.
Steps to create a GKE cluster in GCP
Step 1:
On the GCP console navigate to Kubernetes Engine > Clusters. On the cluster page click Create. If you want to manage your cluster on your own, then select standard else select autopilot mode which manages the cluster automatically. Once you decide then click on configure.
Step 2: Type your desired cluster name and select the GCP region where you want to create a cluster.
Step 3: Click Next and select your network and subnet. For now, we have selected the default network. Choose your network access. Select public if you want to access the cluster from the internet else select private.
Step 4: Select the pod IP address range and service IP range. Specify tags if you want.
Step 5: Click next and configure advanced settings accordingly else leave it to default. Then click review and create. After review click create. The cluster deployment will take around 7-10 minutes. On the overview page, if the status shows a green checkmark, then your cluster is ready to use.
Steps to deploy a containerized application (As Containers) in the GKE cluster
Step 1: On the cluster overview page click on DEPLOY. Specify your container image you can select an existing image or create a new image. For this tutorial, we are using the default nginx template image. You can specify the init command according to your application.
Step 2: Click Continue. Under Configuration specify your application/deployment name. you can add a label apart from the default app label. You can also add a YAML file for configuration details. Then select your GKE cluster from the list.
Step 3: Click Continue. Check Expose deployment as a new service. This will allow our nginx server to be exposed to the internet. Specify ports accordingly. Keep everything else default and click Deploy. Once the deployment is successful go to Workloads from the sidebar. Select the deployed app from the overview page. On the deployment overview page, you can view containers and pods.
Step 4: Finally, scroll to the bottom to see the exposed service.
Step 5: Click on Endpoint URL to view the application in the browser. In our case, we will see the default NGINX page.