kubernetes replicasets

kubernetes.replicasets

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+kubernetes replica sets:
+
+aanmaken manifest met replicas: 1
+
+[ger@master ~]$ cat kuard-rs.yaml 
+apiVersion: extensions/v1beta1
+kind: ReplicaSet
+metadata: 
+  name: kuard
+spec:
+  replicas: 1
+  template: 
+    metadata: 
+      labels:
+        app: kuard
+        version: "2"
+    spec:
+      containers:
+        - name: kuard
+          image: "gcr.io/kuar-demo/kuard-amd64:2"
+
+
+[ger@master ~]$ kubectl apply -f ./kuard-rs.yaml 
+replicaset.extensions/kuard created
+
+check:
+
+[ger@master ~]$ kubectl get pods
+NAME          READY   STATUS    RESTARTS   AGE
+kuard-f25dt   1/1     Running   0          24s
+
+
+meer info:
+
+[ger@master ~]$ kubectl describe rs kuard
+Name:         kuard
+Namespace:    default
+Selector:     app=kuard,version=2
+Labels:       app=kuard
+              version=2
+Annotations:  kubectl.kubernetes.io/last-applied-configuration:
+                {"apiVersion":"extensions/v1beta1","kind":"ReplicaSet","metadata":{"annotations":{},"name":"kuard","namespace":"default"},"spec":{"replica...
+Replicas:     1 current / 1 desired
+Pods Status:  1 Running / 0 Waiting / 0 Succeeded / 0 Failed
+Pod Template:
+  Labels:  app=kuard
+           version=2
+  Containers:
+   kuard:
+    Image:        gcr.io/kuar-demo/kuard-amd64:2
+    Port:         <none>
+    Host Port:    <none>
+    Environment:  <none>
+    Mounts:       <none>
+  Volumes:        <none>
+Events:
+  Type    Reason            Age   From                   Message
+  ----    ------            ----  ----                   -------
+  Normal  SuccessfulCreate  40s   replicaset-controller  Created pod: kuard-f25dt
+
+opschalen naar 4 replica's:
+
+[ger@master ~]$ kubectl scale rs kuard --replicas=4 --all
+replicaset.extensions/kuard scaled
+
+[ger@master ~]$ kubectl get pods
+NAME          READY   STATUS              RESTARTS   AGE
+kuard-66877   0/1     ContainerCreating   0          9s
+kuard-8trx2   0/1     ContainerCreating   0          9s
+kuard-dlb2c   0/1     ContainerCreating   0          9s
+kuard-f25dt   1/1     Running             0          4m59s
+
+[ger@master ~]$ kubectl get pods
+NAME          READY   STATUS    RESTARTS   AGE
+kuard-66877   1/1     Running   0          30s
+kuard-8trx2   1/1     Running   0          30s
+kuard-dlb2c   1/1     Running   0          30s
+kuard-f25dt   1/1     Running   0          5m20s
+
+autoscale:
+
+[ger@master ~]$ kubectl autoscale rs kuard --min=2 --max=5 --cpu-percent=80
+horizontalpodautoscaler.autoscaling/kuard autoscaled
+
+
+check hpa (horizontal pod autoscaler):
+
+[ger@master ~]$ kubectl get hpa
+NAME    REFERENCE          TARGETS         MINPODS   MAXPODS   REPLICAS   AGE
+kuard   ReplicaSet/kuard   <unknown>/80%   2         5         0          11s
+
+
+