Scenario

We have two versions of a website.

The first version V1 looks like :

And the second version V2 looks like :

The goal is to apply the Blue Green strategy deployment to insure that the version V2 of the webiste is deployed with zero-downtime after all checks pass.

I will start by playing with docker-compose techologie.

Docker compose - build docker images

$> cd blue_green/app
$> docker-compose build

# Create tags
$> cd scripts
$> ./docker.sh

Create a new NameSpace

kubectl create ns codeday

Change the current default namespace

# To codeday
kubectl config set-context --current --namespace=codeday

# To default
kubectl config set-context --current --namespace=default

Codeday v1 / v2 Services

$> cd Demo_CodeWorks/blue_green/k8s

# Codeday V1 Blue Service
$> kubectl create -f nginx-codeday-blue.service.yml -n codeday --save-config --record

# Codeday V1 Green Service
$> kubectl create -f nginx-codeday-green.service.yml -n codeday --save-config --record

Define environment variables for codeday-v2-blue

export DCK_IMAGE_SUFFIX=codeday-v1-blue

NGINX CodeDay v1 Deployment

cat nginx-codeday.deployment.yml | sh config.sh | kubectl create -n codeday --save-config --record -f -

NGINX Codeday v1 / v2 Public Service

cat nginx-codeday-public.service.yml | sh config.sh | kubectl create -n codeday --save-config --record -f -

Check Codeday Website Version

$> cd scripts
$> ./curl_codeday_public_service.sh

SWITCH TO GREEN AFTER CHECKS PASS !

Update DCK_IMAGE_SUFFIX env variable to codeday-v2-green

export DCK_IMAGE_SUFFIX=codeday-v2-green

Update NGINX Codeday Deployment

cat nginx-codeday.deployment.yml | sh config.sh | kubectl apply -n codeday --record -f -

Update NGINX Codeday v1/v2 Public Service

cat nginx-codeday-public.service.yml | sh config.sh | kubectl apply -n codeday --record -f -

FINISH