This comprehensive project is designed to guide developers through the setup of a virtual environment for Kubernetes deployment using Vagrant, deploying K3s, understanding its Ingress feature, simplifying Kubernetes management with K3d, and implementing CD for working clusters in Docker. Whether you're a seasoned developer or just starting with Kubernetes, this project provides hands-on experience and improves your CD skills.
In this section, we'll create a Kubernetes cluster using K3s on virtual machines provisioned by Vagrant.
- Clone this repository.
- Run
vagrant upin the project directory to create two VMs:ciglesiaSandciglesiaSWwith dedicated IPs. - SSH into "ciglesiaS" VM using
vagrant ssh ciglesiaS. - Use
kubectlcommands to interact with the cluster.
This part focuses on running three simple web applications within a K3s instance on a single virtual machine.
Depending on the host used when making a request to IP address 192.168.56.110, different applications will be displayed.
- Deployment: Manages Pods and ReplicaSets, ensuring the desired number of pod replicas.
- Services: Acts as a stable network interface to a dynamic set of Pods.
- Ingress: Routes external HTTP traffic to internal Services.
The host determines which application will be accessed.
# From the host of the vm
curl -H "Host:app1.com" localhost:8888
curl -H "Host:app1.com" 192.168.56.110
# From inside the vm
curl -H "Host:app1.com" localhostThat will output:
<!DOCTYPE html>
<html>
<head>
<title>Hello Kubernetes!</title>
<link rel="stylesheet" type="text/css" href="/css/main.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Ubuntu:300" >
</head>
<body>
<div class="main">
<img src="/images/kubernetes.png"/>
<div class="content">
<div id="message">
Hello from app1.
</div>
<div id="info">
<table>
<tr>
<th>pod:</th>
<td>deploy-app1-544d9fdb76-nzn2z</td>
</tr>
<tr>
<th>node:</th>
<td>Linux (6.1.0-18-amd64)</td>
</tr>
</table>
</div>
</div>
</div>
</body>
</html>
Part 3 involves setting up a k3d cluster on a virtual machine without using Vagrant. Continuous deployment is implemented using Argo CD to deploy and update an application from a public GitHub repository.
- Run the
k3d.shscript to install and set up the k3d cluster. - Execute the
argocd.shscript to set up ArgoCD and the application in Docker.
The ArgoCD service runs on port 8443, and the application (accessible via Kubernetes service) runs on port 8888.
To verify which version the server is currently running, use:
curl http://localhost:8888
# This should return:
{"status":"ok", "message": "v2"}You can access the ArgoCD web interface by browsing to http://localhost:8443, which automates the synchronization of the containerized app version with the manifest found at deploy.yaml.
For more details, check out the respective parts in the repository: Inception-of-Things.