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Author: onlineTrainingguy

Kubernetes/Kubernetes Demo Files/ReplicaSet.txt

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+*******************************************************************
+.
+. Demo: ReplicaSet  |  youtube.com/SrinathChalla
+.
+
+*******************************************************************
+ReplicaSet YAML file
+
+# nginx-rs.yaml
+apiVersion: apps/v1
+kind: ReplicaSet
+metadata:
+  name: nginx-rs
+spec:
+  replicas: 3
+  template:
+    metadata:
+      name: nginx-pod
+      labels:
+        app: nginx-app
+        tier: frontend
+    spec:
+      containers:
+      - name: nginx-container
+        image: nginx
+        ports:
+        - containerPort: 80
+  selector:
+    matchLabels:
+      app: nginx-app
+    matchExpressions:
+      - {key: tier, operator: In, values: [frontend]}
+
+
+*******************************************************************
+# 2. Create and display replicaset
+
+kubectl create -f nginx-rs.yaml
+kubectl get po -o wide
+kubectl get po -l app=nginx-app
+kubectl get rs nginx-rs -o wide
+kubectl describe rs nginx-rs
+
+*******************************************************************
+# 3. Automatic Pod Reschedule 
+
+kubectl get po -o wide --watch
+kubectl get po -o wide
+kubectl get nodes
+
+*******************************************************************
+# 4. Scale up pods
+
+kubectl scale rs nginx-rs --replicas=5
+kubectl get rs nginx-rs -o wide
+kubectl get po -o wide
+
+*******************************************************************
+# 5. Scale down pods
+
+kubectl scale rs nginx-rs --replicas=3
+kubectl get rs nginx-rs -o wide
+kubectl get po -o wide
+
+*******************************************************************
+# 6. Cleanup
+
+kubectl delete -f nginx-rs.yaml
+kubectl get rs
+kubectl get po -l app=nginx-app
+
+*******************************************************************
+
+
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