Kubernetes Deployment Strategies
Deploying applications with Kubernetes has become increasingly popular due to its numerous benefits. Kubernetes enables easy management of containerized applications, providing a platform for application deployment, scaling, and management. With Kubernetes, applications can be deployed quickly and consistently across different environments, including on-premises and cloud platforms.
While deploying applications with Kubernetes, many of us will have questions about what deployment type to use — rolling, blue-green, canary, etc. In this article, we will discuss these deployment types (canary, rolling, and blue-green), how they work, and which one you should choose.
Kubernetes canary deployment is a technique for rolling out new features or changes to a small subset of users or servers before releasing the update to the entire system. This is done by creating a new replica set with the updated version of the software while keeping the original replica set running. A small percentage of traffic is then routed to the new replica set, while the majority of the traffic continues to be served by the original replica set. This allows for the new version to be tested in a live environment while minimizing the risk of issues affecting the entire system. If issues are detected during the canary deployment, it can be quickly rolled back to the original replica set. Canary deployments are a valuable tool for minimizing risk and ensuring high availability in complex distributed systems, by allowing for controlled testing of changes before they are released to the entire system.
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-deployment
spec:
replicas: 3
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
– name: myapp-container
image: myapp:v1
ports:
– containerPort: 8080
readinessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 5
periodSeconds: 5
livenessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 10
periodSeconds: 10