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‎Kubernetese/Deployment Strategies/blue-green/README.md‎

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Blue/green deployment
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=====================
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> Version B is released alongside version A, then the traffic is switched to
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version B. Also known as red/black deployment.
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![kubernetes blue-green deployment](grafana-blue-green.png)
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The blue/green deployment strategy differs from a ramped deployment, version B
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(green) is deployed alongside version A (blue) with exactly the same amount of
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instances. After testing that the new version meets all the requirements the
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traffic is switched from version A to version B at the load balancer level.
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**You can apply the blue/green deployment technique for a single service or
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multiple services using an Ingress controller:**
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- [multiple services using Ingress](multiple-services/)
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- [single service](single-service/)

‎Kubernetese/Deployment Strategies/blue-green/grafana-blue-green.png‎

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‎Kubernetese/Deployment Strategies/blue-green/multiple-services/README.md‎

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Blue/green deployment to release multiple services simultaneously
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=================================================================
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> In this example, we release a new version of 2 services simultaneously using
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the blue/green deployment strategy. [Traefik](https://traefik.io) in used as
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Ingress controller, this example would also work with the
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[Nginx Ingress controller](https://github.com/kubernetes/ingress-nginx).
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## Steps to follow
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1. service a and b are serving traffic
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1. deploy new version of both services
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1. wait for all services to be ready
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1. switch incoming traffic from version 1 to version 2
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1. shutdown version 1
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## In practice
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Install the latest version of
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[Helm](https://docs.helm.sh/using_helm/#installing-helm), then install
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[Traefik](https://traefik.io/):
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```bash
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# Deploy Traefik with Helm
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$ helm install \
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--name=traefik \
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--version=1.60.0 \
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--set rbac.enabled=true \
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stable/traefik
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# Deploy version 1 of application a and b and the ingress
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$ kubectl apply -f app-a-v1.yaml -f app-b-v1.yaml -f ingress-v1.yaml
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# Test if the deployment was successful
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$ ingress=$(minikube service traefik --url | head -n1)
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$ curl $ingress -H 'Host: a.domain.com'
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Host: my-app-a-v1-66fb8d6f99-hs8jr, Version: v1.0.0
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$ curl $ingress -H 'Host: b.domain.com'
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Host: my-app-b-v1-5766557f99-dpghc, Version: v1.0.0
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# To see the deployment in action, open a new terminal and run the following
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# command
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$ watch kubectl get po
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# Then deploy version 2 of both applications
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$ kubectl apply -f app-a-v2.yaml -f app-b-v2.yaml
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# Wait for both applications to be running
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$ kubectl rollout status deploy my-app-a-v2 -w
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deployment "my-app-a-v2" successfully rolled out
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$ kubectl rollout status deploy my-app-b-v2 -w
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deployment "my-app-b-v2" successfully rolled out
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# Check the status of the deployment, then when all the pods are ready, you can
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# update the ingress
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$ kubectl apply -f ingress-v2.yaml
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# Test if the deployment was successful
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$ curl $ingress -H 'Host: a.domain.com'
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Host: my-app-a-v2-6b58d47c5f-nmzds, Version: v2.0.0
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$ curl $ingress -H 'Host: b.domain.com'
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Host: my-app-b-v2-5c9dc59959-hp5kh, Version: v2.0.0
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# In case you need to rollback to the previous version
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$ kubectl apply -f ingress-v1.yaml
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# If everything is working as expected, you can then delete the v1.0.0
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# deployment
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$ kubectl delete -f ./app-a-v1.yaml -f ./app-b-v1.yaml
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```
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### Cleanup
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```bash
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$ kubectl delete all -l app=my-app
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$ helm del --purge traefik
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```

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/app-a-v1.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: my-app-a-v1
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labels:
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app: my-app
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spec:
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ports:
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- name: http
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port: 80
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targetPort: http
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# Note here that we match both the app and the version
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selector:
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app: my-app-a
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version: v1.0.0
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: my-app-a-v1
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labels:
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app: my-app
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: my-app-a
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version: v1.0.0
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template:
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metadata:
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labels:
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app: my-app-a
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version: v1.0.0
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annotations:
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prometheus.io/scrape: "true"
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prometheus.io/port: "9101"
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spec:
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containers:
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- name: my-app-a
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image: containersol/k8s-deployment-strategies
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ports:
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- name: http
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containerPort: 8080
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- name: probe
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containerPort: 8086
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env:
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- name: VERSION
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value: v1.0.0
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livenessProbe:
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httpGet:
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path: /live
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port: probe
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initialDelaySeconds: 5
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periodSeconds: 5
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readinessProbe:
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httpGet:
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path: /ready
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port: probe
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periodSeconds: 5

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/app-a-v2.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: my-app-a-v2
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labels:
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app: my-app
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spec:
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ports:
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- name: http
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port: 80
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targetPort: http
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# Note here that we match both the app and the version
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selector:
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app: my-app-a
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version: v2.0.0
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: my-app-a-v2
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labels:
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app: my-app
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: my-app-a
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version: v2.0.0
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template:
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metadata:
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labels:
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app: my-app-a
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version: v2.0.0
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annotations:
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prometheus.io/scrape: "true"
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prometheus.io/port: "9101"
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spec:
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containers:
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- name: my-app-a
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image: containersol/k8s-deployment-strategies
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ports:
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- name: http
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containerPort: 8080
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- name: probe
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containerPort: 8086
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env:
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- name: VERSION
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value: v2.0.0
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livenessProbe:
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httpGet:
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path: /live
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port: probe
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initialDelaySeconds: 5
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periodSeconds: 5
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readinessProbe:
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httpGet:
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path: /ready
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port: probe
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periodSeconds: 5

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/app-b-v1.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: my-app-b-v1
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labels:
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app: my-app
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spec:
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ports:
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- name: http
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port: 80
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targetPort: http
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# Note here that we match both the app and the version
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selector:
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app: my-app-b
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version: v1.0.0
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: my-app-b-v1
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labels:
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app: my-app
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: my-app-b
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version: v1.0.0
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template:
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metadata:
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labels:
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app: my-app-b
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version: v1.0.0
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annotations:
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prometheus.io/scrape: "true"
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prometheus.io/port: "9101"
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spec:
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containers:
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- name: my-app-b
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image: containersol/k8s-deployment-strategies
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ports:
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- name: http
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containerPort: 8080
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- name: probe
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containerPort: 8086
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env:
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- name: VERSION
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value: v1.0.0
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livenessProbe:
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httpGet:
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path: /live
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port: probe
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initialDelaySeconds: 5
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periodSeconds: 5
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readinessProbe:
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httpGet:
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path: /ready
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port: probe
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periodSeconds: 5

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/app-b-v2.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: my-app-b-v2
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labels:
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app: my-app
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spec:
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ports:
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- name: http
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port: 80
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targetPort: http
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# Note here that we match both the app and the version
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selector:
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app: my-app-b
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version: v2.0.0
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: my-app-b-v2
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labels:
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app: my-app
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: my-app-b
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version: v2.0.0
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template:
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metadata:
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labels:
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app: my-app-b
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version: v2.0.0
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annotations:
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prometheus.io/scrape: "true"
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prometheus.io/port: "9101"
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spec:
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containers:
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- name: my-app-b
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image: containersol/k8s-deployment-strategies
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ports:
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- name: http
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containerPort: 8080
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- name: probe
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containerPort: 8086
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env:
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- name: VERSION
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value: v2.0.0
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livenessProbe:
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httpGet:
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path: /live
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port: probe
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initialDelaySeconds: 5
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periodSeconds: 5
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readinessProbe:
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httpGet:
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path: /ready
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port: probe
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periodSeconds: 5

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/ingress-v1.yaml‎

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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: my-app
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labels:
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app: my-app
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annotations:
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kubernetes.io/ingress.class: traefik
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spec:
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rules:
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- host: a.domain.com
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http:
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paths:
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- backend:
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serviceName: my-app-a-v1
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servicePort: 80
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- host: b.domain.com
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http:
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paths:
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- backend:
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serviceName: my-app-b-v1
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servicePort: 80

‎Kubernetese/Deployment Strategies/blue-green/multiple-services/ingress-v2.yaml‎

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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: my-app
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labels:
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app: my-app
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annotations:
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kubernetes.io/ingress.class: traefik
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spec:
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rules:
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- host: a.domain.com
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http:
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paths:
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- backend:
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serviceName: my-app-a-v2
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servicePort: 80
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- host: b.domain.com
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http:
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paths:
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- backend:
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serviceName: my-app-b-v2
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servicePort: 80

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