add blue/green

README.md

@@ -117,7 +117,13 @@ $ kubectl --kubeconfig="/path/to/prod-cluster-kubeconfig.yaml" apply -f deployme
 Blue/Green: release a new version alongside the old version then switch traffic.
 
 ```zsh
-$ ~
+$ kubectl --kubeconfig="/path/to/prod-cluster-kubeconfig.yaml" apply -f deployment/k8s/blue_green/toad_blue_green_strategy.yaml --record
+
+# Create service to load balance the old version (blue)
+$ kubectl --kubeconfig="/path/to/prod-cluster-kubeconfig.yaml" apply -f deployment/k8s/blue_green/switch_to_blue.yaml --record
+
+# Create service to load balance the new version (green)
+$ kubectl --kubeconfig="/path/to/prod-cluster-kubeconfig.yaml" apply -f deployment/k8s/blue_green/switch_to_green.yaml --record
 ```
 
 Canary: release a new version to a subset of users, then proceed to a full rollout.

deployment/k8s/blue_green/switch_to_blue.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: toad-loadbalancer
+  labels:
+    app: toad
+    tier: backend
+spec:
+  ports:
+    -
+      port: 80
+      targetPort: 8080
+  selector:
+    app: toad
+    tier: backend
+    deployment: blue # Old version
+  type: LoadBalancer

deployment/k8s/blue_green/switch_to_green.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: toad-loadbalancer
+  labels:
+    app: toad
+    tier: backend
+spec:
+  ports:
+    -
+      port: 80
+      targetPort: 8080
+  selector:
+    app: toad
+    tier: backend
+    deployment: green # New version
+  type: LoadBalancer

deployment/k8s/blue_green/toad_blue_green_strategy.yaml

@@ -117,22 +117,3 @@ spec:
             port: 8080
           initialDelaySeconds: 10
           periodSeconds: 5
-
----
-apiVersion: v1
-kind: Service
-metadata:
-  name: toad-loadbalancer
-  labels:
-    app: toad
-    tier: backend
-spec:
-  ports:
-    -
-      port: 80
-      targetPort: 8080
-  selector:
-    app: toad
-    tier: backend
-    deployment: blue # Old version
-  type: LoadBalancer