Blue Green Deployments using Kubernetes Namespaces

Read More

at https://medium.com/itnext/kubernetes-namespaces-the-secret-weapon-for-zero-risk-blue-green-deployments-5e59060a6267

Quickstart

1. Create Namespaces

kubectl create ns nginx-blue
kubectl create ns nginx-green
kubectl create ns bg-switch

2. Setup your /etc/hosts to point to the custom URL within ingress.yaml
3. Install the manifests

```bash
kubectl apply -f ingress.yaml -n bg-switch
kubectl apply -f service-switch -n bg-switch
kubectl apply -f blue-app.yaml -n nginx-blue
kubectl apply -f green-app.yaml -n nginx-green

4. Switch between blue and green using patch.

kubectl patch service bg-switch-service -n bg-switch --type=merge -p '{"spec":{"externalName":"nginx-green-svc.nginx-green.svc.cluster.local"}}'