added

k3d/blue-green/doku

@@ -0,0 +1,128 @@
+Blue Green Deployment
+
+create version 1 and 2 and services
+
+# prepare namespace
+
+
+mkdir ~/blue-green && cd ~/blue-green
+kubectl create namespace blue-green
+kubectl config set-context --current --namespace blue-green
+
+# create manifests
+
+cat >nginx-v1.yaml <<EOF
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: web
+    version: V1.0.0
+  name: webv1
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: web
+      version: V1.0.0
+  template:
+    metadata:
+      labels:
+        app: web
+        version: V1.0.0
+    spec:
+      containers:
+      - image: nginx:1.19.3
+        name: nginx
+        ports:
+        - name: http
+          containerPort: 80
+EOF
+
+cat >nginx-v2.yaml <<EOF
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: web
+    version: V2.0.0
+  name: webv2
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: web
+      version: V2.0.0
+  template:
+    metadata:
+      labels:
+        app: web
+        version: V2.0.0
+    spec:
+      containers:
+      - image: nginx:1.19.8
+        name: nginx
+        ports:
+        - name: http
+          containerPort: 80
+EOF
+cat >nginx-svc.yaml <<EOF
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: web
+  name: nginx
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: web
+    version: V1.0.0
+EOF
+
+Deployment from blue to green
+
+
+# deploy blue
+
+kubectl apply -f nginx-v1.yaml 
+kubectl apply -f nginx-svc.yaml
+kubectl describe deployment webv1
+kubectl describe svc nginx
+kubectl get ep nginx
+
+# deploy green
+kubectl apply -f nginx-v2.yaml
+
+# traffic shift
+kubectl patch service nginx --patch '{"spec":{"selector":{"version":"V2.0.0"}}}'
+
+# Test if the second deployment was successful
+kubectl describe deployment webv2
+kubectl describe svc nginx
+kubectl get ep nginx
+
+# cleanup v1
+
+kubectl delete deploy webv1
+
+WARNING:Traefik shift don't change established connection!!
+
+kubectl run nc -it --rm --image curlimages/curl -- /bin/sh
+nc  nginx.blue-green.svc.cluster.local 80
+GET /index.html HTTP/1.1
+Host: localhost
+
+...
+
+# switch at other terminal the load with patch
+#kubectl patch service nginx --patch '{"spec":{"selector":{"version":"V1.0.0"}}}'
+
+GET /index.html HTTP/1.1
+Host: localhost
+
+# same server/pod answer ...
+

k3d/blue-green/nginx-svc.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: web
+  name: nginx
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: web
+    version: V1.0.0

k3d/blue-green/nginx-v1.yaml

@@ -0,0 +1,25 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: web
+    version: V1.0.0
+  name: webv1
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: web
+      version: V1.0.0
+  template:
+    metadata:
+      labels:
+        app: web
+        version: V1.0.0
+    spec:
+      containers:
+      - image: nginx:1.19.3
+        name: nginx_new
+        ports:
+        - name: http
+          containerPort: 80

k3d/blue-green/nginx-v2.yaml

@@ -0,0 +1,25 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: web
+    version: V2.0.0
+  name: webv2
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: web
+      version: V2.0.0
+  template:
+    metadata:
+      labels:
+        app: web
+        version: V2.0.0
+    spec:
+      containers:
+      - image: nginx:1.19.8
+        name: nginx_old
+        ports:
+        - name: http
+          containerPort: 80