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https://github.com/prasanth624/blue-green-deployment-k8s
https://github.com/prasanth624/blue-green-deployment-k8s
docker dockerfile k8s kubernetes kubernetes-deployment
Last synced: 6 days ago
JSON representation
- Host: GitHub
- URL: https://github.com/prasanth624/blue-green-deployment-k8s
- Owner: prasanth624
- License: mit
- Created: 2024-10-30T14:43:12.000Z (3 months ago)
- Default Branch: main
- Last Pushed: 2024-12-16T14:45:22.000Z (about 1 month ago)
- Last Synced: 2024-12-16T15:42:09.058Z (about 1 month ago)
- Topics: docker, dockerfile, k8s, kubernetes, kubernetes-deployment
- Language: HTML
- Homepage:
- Size: 10.7 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Blue-Green Deployment in Kubernetes
## Overview
This repository shows how to use **Blue-Green Deployment** with **Kubernetes**. This method helps you update applications smoothly, keeping downtime to a minimum. In this demo, we have two environments: Blue and Green, plus a service to manage traffic between them.
## What is Blue-Green Deployment?
Blue-Green Deployment means having two identical environments:
- **Blue Environment**: This is the current version of your application that users are accessing.
- **Green Environment**: This is where the new version is deployed and tested without affecting users.
### Benefits
- **No Downtime** ⏳: Users can continue using the application while updates happen.
- **Easy Rollback** 🔄: If there are problems, you can quickly switch back to the previous version.
- **Safe Testing** 🛡️: Test new features in a real-like environment without risks.
## Getting Started
### Prerequisites
- **Kubernetes Cluster**: Set up a local or cloud-based Kubernetes environment (like Minikube or EKS).
- **kubectl**: This is the command-line tool to interact with your Kubernetes cluster.
- **Docker (optional)**: if you want to build custom images, have Docker installed.
### Installation
1. **Clone the Repository**:
```bash
git clone https://github.com/prasanth624/blue-green-deployment-k8s.git
cd blue-green-deployment-k8s
```
2. **Deploy to Kubernetes**:
Apply the Kubernetes files:
```bash
kubectl apply -f blue-deployment.yaml
kubectl apply -f green-deployment.yaml
kubectl apply -f service.yaml
```
3. **Access the Application**:
Forward the service port to access the application:
```bash
kubectl port-forward service/my-app 8080:80
```
Visit [http://localhost:8080](http://localhost:8080) to see the Blue version in action! 🎉
### Switching Environments
To switch from the Blue environment to the Green environment:
1. **Open the Service YAML** ✏️:
Find your `service.yaml` file where the service configuration is defined.
2. **Modify the Selector** 🔄:
Change the `version` field from `blue` to `green` in the selector section.
**Before**:
```yaml
selector:
app: my-app
version: blue # Current version
```
**After**:
```yaml
selector:
app: my-app
version: green # Updated to Green
```
3. **Apply the Changes** 🚀:
Save the file and run the following command to apply the updates:
```bash
kubectl apply -f service.yaml
```
4. **Verify the Update** ✅:
Check that the service is now routing to the Green version:
```bash
kubectl get svc my-app
```
5. **Test the Application** 🖥️:
Port-forward the service and visit [http://localhost:8080](http://localhost:8080) to see "This is the green version."
### Rollback
If something goes wrong after switching to Green, just change the service back to Blue and reapply the configuration.
## Example Outputs
- **Blue Version**: Shows "This is the blue version."
- **Green Version**: Shows "This is the green version."
## Contributing
If you have ideas for improvements or new features, feel free to submit a pull request. 🤝
## License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details. 📜