CKD new question

[gairik]

Create a similar 2 deployment and mark them as Blue and Green. Create a Service so that the load is balanced between Blue and Green at 75%-25% ratio. Does anyone know how can we do this kind if question? I tried doing this by create deployments of 2 different pods of 3 numbers and 1 number and expected to the traffic to flow that way. However i am not successful. If you want to try, I have also created a sample for you to try. look below. If you know the answer please let me know below

[gairik]

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: nginx
  name: nginx-green
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
      color: green
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
        color: green
    spec:
     containers:
     - name: nginx
       image: nginx
       ports:
         - containerPort: 80
       volumeMounts:
         - mountPath: /usr/share/nginx/html/index.html
           name: nginx-conf
           subPath: index.html
     volumes:
        - name: nginx-conf
          configMap:
            name: config-green

---            
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: nginx-blue
  name: nginx-blue
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      color: blue
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
        color: blue
    spec:
     containers:
     - name: nginx
       image: nginx
       ports:
         - containerPort: 80
       volumeMounts:
         - mountPath: /usr/share/nginx/html/index.html
           name: nginx-conf
           subPath: index.html
     volumes:
        - name: nginx-conf
          configMap:
            name: config

Service

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: nginx-blue
  name: nginx-blue
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  type: NodePort
status:
  loadBalancer: {}

Config maps

Name:         config-green
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
index.html:
----
GREEEN

Events:  <none>

Name:         config
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
index.html:
----
Blue deployment

Events:  <none>

[szinck1]

I don't see the label app=nginx on the second deployment.

[gairik]

I don't see the label app=nginx on the second deployment.

I can see it

[santhu-msciflex]

If I am not wrong, it was canary deployment scenario. You had one deployment already running and given another deployment to be executed. After executing the second deployment use kubectl scale deployment blue-deployment-name replicas=3 kubectl scale deployment green-deployment-name replicas=1

[gairik]

@santhu-msciflex Can you please point me to a documentation that says 3:1 pod ratio will automatically load balance? I tried to do the same however I did not get the same result. It was totally random.

[santhu-msciflex]

@gairik - I couldn't get the 3:1 ratio when tested locally using docker-desktop. service type as LoadBalancer might be a solution. Referring to link https://phoenixnap.com/kb/kubernetes-canary-deployments

[kaizendae]

Having a ratio of 3:1 in the number of PODs does not imply that traffic will be split 3:1, but it does imply that a small portion of the traffic will go to canary, which is the goal of canary in the first place.

[MarcoPalomo]

This is made by a weighted load balancing solution (like istio or nginx for instance).