Скачать или смотреть 🚀 Deploying Applications in Kubernetes: Rolling Updates and Blue-Green Deployments

In this informative video from our Kubernetes tutorial series, we tackle the process of application deployment! 📦 We will discuss two popular deployment strategies: Rolling Updates and Blue-Green Deployments. Understanding these methods is essential for maintaining application availability during updates and ensuring a smooth user experience.

What You Will Learn:

⚙️ An overview of application deployment in Kubernetes
🔄 How Rolling Updates work and their advantages
🌈 Understanding Blue-Green Deployments and when to use them
📋 Detailed examples to illustrate both deployment strategies
Step-by-Step Guide:

Introduction to Deployments:

Learn about the importance of deployments in managing the lifecycle of your applications in Kubernetes. A deployment ensures that your application is up and running smoothly! 🚀
Rolling Updates:

Rolling Updates allow you to update your application without downtime by replacing pods incrementally. This method ensures that there are always pods serving traffic to users.
How It Works:
Define your deployment in a deployment.yaml file:
yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
name: my-container
image: myapp:v1
To perform a rolling update, simply update the image version:
bash
kubectl set image deployment/my-app my-container=myapp:v2
Kubernetes will then update the pods gradually, maintaining steady traffic. 📈
Blue-Green Deployments:

Blue-Green Deployments involve maintaining two separate environments—Blue (current version) and Green (new version). This strategy allows for seamless switching between versions.
How It Works:
Set up two environments, and initially, route traffic to the Blue environment:
yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app-blue
spec:
replicas: 3
selector:
matchLabels:
app: myapp-blue
template:
metadata:
labels:
app: myapp-blue
spec:
containers:
name: my-container
image: myapp:v1
Deploy the new version in the Green environment:
yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app-green
spec:
replicas: 3
selector:
matchLabels:
app: myapp-green
template:
metadata:
labels:
app: myapp-green
spec:
containers:
name: my-container
image: myapp:v2
Once the Green version is fully deployed and tested, switch traffic to the Green deployment:
bash
kubectl expose deployment my-app-green --type=LoadBalancer --name=my-service
If issues arise, it’s easy to roll back to the Blue version, ensuring maximum uptime! 🔄
Conclusion:

Both Rolling Updates and Blue-Green Deployments serve specific needs for application deployment. Choose the method that best fits your scenario to ensure high availability and a seamless user experience.
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Do practice with code:

https://github.com/lerndevops/kuberne...