DevOps-EveningBatch-29Jan/Notes-Kubernetes-19Feb at main · Sonal0409/DevOps-EveningBatch-29Jan · GitHub

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ReplicaSet:

---
apiVersion: apps/v1
kind: ReplicaSet
metadata:
 name: myrs
spec:
 replicas: 3
 selector:
  matchExpressions:
   - {key: type, operator: In, values: [webserver_1, webserver_2]}
 template:
  metadata:
   name: mypod
   labels:
    type: webserver_2
  spec:
   containers:
    - name: c1
      image: nginx

=======================
Deployment:
=======================

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      name: nginxpod
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:latest

==========================

HPA
=======================

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:latest
          resources:
            limits:
              cpu: 10m

===================
HPA YAML

              apiVersion: autoscaling/v1
              kind: HorizontalPodAutoscaler
              metadata:
                name: nginx-hpa
              spec:
                scaleTargetRef:
                  apiVersion: apps/v1
                  kind: Deployment
                  name: nginx
                minReplicas: 1
                maxReplicas: 10
                targetCPUUtilizationPercentage: 5

============
Service for HPA scenario:
=============


              apiVersion: v1
              kind: Service
              metadata:
                name: nginx-svc
              spec:
                type: ClusterIP
                selector:
                  app: nginx
                ports:
                 - protocol: TCP
                   port: 80
                   targetPort: 80

================
Command to generate the load:

# kubectl run -i --tty load-generator --rm --image=busybox --restart=Never -- /bin/sh -c "while sleep 0.01; do wget -q -O- http://10.8.10.18:80; done"