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Getting Started with Kubernetes

Deploy an Express.js Server with a Load Balancer

This repository contains all the necessary scripts and code to deploy an Express.js server on a Kubernetes cluster hosted on Linode.

The app uses the Express framework to create a simple API server that interacts with the Ethereum blockchain. It utilizes the Web3.js library to fetch the balance of an Ethereum address using a Chainstack node.

The project aims to provide a comprehensive guide for beginners to get hands-on experience with Kubernetes deployments, pod management, and load balancing.

Find the full guide on Chainstack's Developer Portal: Getting started with Kubernetes on Linode

Prerequisites

• Kubernetes CLI— Install kubectl
• Linode Account
• Chainstack account

Quick Start

1. Clone the Repository

   git clone https://github.com/soos3d/get-started-with-kubernetes.git
   

2. Navigate to the Project Directory

   cd get-started-with-kubernetes
   

3. Set KUBECONFIG Environment Variable

   Deploy a kubernetes cluster on Linode and get the kubeconfig.yaml file, then add it to the project and run:

   export KUBECONFIG=kubeconfig.yaml
   

4. Deploy the Pod

   First deploy an Ethereum node on Chainstack:

   1. Sign up with Chainstack.
   2. Deploy a node.
   3. View node access and credentials.

   Use the node RPC URL as environment variable.

   kubectl run addressbalance --image=soos3d/addressbalance:latest --port=80 --env="ETHEREUM_RPC_URL=YOUR_CHAINSTACK_NODE_URL" --env="PORT=3333"
   

   This will deply one pod manually.

5. Deploy Using Manifest

   Find the manifest in the k8s directory.

   Add the Chainstack RPC node to the environment variables.

   env:
     - name: ETHEREUM_RPC_URL
       value: "YOUR_CHAINSTACK_RPC_URL"
     - name: PORT
       value: "3333"

   Then run:

   kubectl apply -f server_deployment.yaml

   This will deploy 4 managed pods.

6. Set Up Load Balancer

   Find the manifest in the k8s directory.

   kubectl apply -f server_loadbalance.yaml
   

Features

• Step-by-step guide to deploying your first pod
• Detailed explanation of Kubernetes Deployment manifests
• Load balancing with Linode's built-in service
• Environment variable configuration

Contributing

Feel free to open issues or PRs if you find any problems or have suggestions for improvements.