docs: add Kubernetes CKS study notes

2026-08-04 23:18:45 +02:00
parent a6ee7a2b07
commit 91a1849009
57 changed files with 8313 additions and 0 deletions
--- a/exams/exam-1.md
+++ b/exams/exam-1.md
@@ -0,0 +1,231 @@
+# Task 1
+
+```bash
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    run: mc-pod
+  name: mc-pod
+  namespace: mc-namespace
+spec:
+  containers:
+  - image: nginx:1-alpine
+    name: mc-pod-1
+    env:
+    - name: NODE_NAME
+      valueFrom:
+        fieldRef:
+          fieldPath: spec.nodeName    
+  - image: busybox:1
+    name: mc-pod-2
+    command: ["sh", "-c"]
+    args: ["while true; do date >> /var/log/shared/date.log; sleep 1; done"]
+    volumeMounts:
+    - mountPath: /var/log/shared
+      name: shared-log
+  - image: busybox:1
+    name: mc-pod-3
+    command: ["sh", "-c"]
+    args: ["tail -f /var/log/shared/date.log"]
+    volumeMounts:
+    - mountPath: /var/log/shared
+      name: shared-log
+  volumes:
+  - name: shared-log
+    emptyDir:
+      sizeLimit: 500Mi
+
+
+echo "verticalpodautoscalercheckpoints" >> /root/vpa-crds.txt
+echo "verticalpodautoscalers" >> /root/vpa-crds.txt
+
+
+kubectl expose pod messaging --port=6379 --name=messaging-service
+
+kubectl create deployment hr-web-app --image=kodekloud/webapp-color --replicas=2
+
+cat webapp-hpa.yaml 
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: webapp-hpa
+  namespace: default
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: kkapp-deploy
+  minReplicas: 2
+  maxReplicas: 10
+
+
+
+cat pv.yaml 
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: pv-analytics
+spec:
+  hostPath:
+    path: /pv/data-analytics
+  accessModes:
+    - ReadWriteMany
+  capacity: 
+    storage: 100Mi
+
+cat orange.yaml 
+apiVersion: v1
+kind: Pod
+metadata:
+  creationTimestamp: "2026-07-21T19:20:48Z"
+  generation: 1
+  name: orange
+  namespace: default
+  resourceVersion: "4629"
+  uid: 3a8c1925-7db8-4518-9489-e6ae2e814ac5
+spec:
+  containers:
+  - command:
+    - sh
+    - -c
+    - echo The app is running! && sleep 3600
+    image: busybox:1.28
+    imagePullPolicy: IfNotPresent
+    name: orange-container
+    resources: {}
+    terminationMessagePath: /dev/termination-log
+    terminationMessagePolicy: File
+    volumeMounts:
+    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
+      name: kube-api-access-jhc2d
+      readOnly: true
+  dnsPolicy: ClusterFirst
+  enableServiceLinks: true
+  initContainers:
+  - command:
+    - sh
+    - -c
+    - sleep 2;
+    image: busybox
+    imagePullPolicy: Always
+    name: init-myservice
+    resources: {}
+    terminationMessagePath: /dev/termination-log
+    terminationMessagePolicy: File
+    volumeMounts:
+    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
+      name: kube-api-access-jhc2d
+      readOnly: true
+  nodeName: controlplane
+  preemptionPolicy: PreemptLowerPriority
+  priority: 0
+  restartPolicy: Always
+  schedulerName: default-scheduler
+  securityContext: {}
+  serviceAccount: default
+  serviceAccountName: default
+  terminationGracePeriodSeconds: 30
+  tolerations:
+  - effect: NoExecute
+    key: node.kubernetes.io/not-ready
+    operator: Exists
+    tolerationSeconds: 300
+  - effect: NoExecute
+    key: node.kubernetes.io/unreachable
+    operator: Exists
+    tolerationSeconds: 300
+  volumes:
+  - name: kube-api-access-jhc2d
+    projected:
+      defaultMode: 420
+      sources:
+      - serviceAccountToken:
+          expirationSeconds: 3607
+          path: token
+      - configMap:
+          items:
+          - key: ca.crt
+            path: ca.crt
+          name: kube-root-ca.crt
+      - downwardAPI:
+          items:
+          - fieldRef:
+              apiVersion: v1
+              fieldPath: metadata.namespace
+            path: namespace     
+
+kubectl expose deployment hr-web-app --port=8080 --type=NodePort --name=hr-web-app-service                 
+
+-----------
+
+cat /root/webapp-hpa.yaml
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: webapp-hpa
+spec:
+  maxReplicas: 10
+  metrics:
+  - resource:
+      name: cpu
+      target:
+        averageUtilization: 50
+        type: Utilization
+    type: Resource
+  minReplicas: 1
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: kkapp-deploy
+status:
+  currentMetrics: null
+  desiredReplicas: 0
+
+----------------------------
+
+# vpa
+# ----------------
+
+apiVersion: autoscaling.k8s.io/v1
+kind: VerticalPodAutoscaler
+metadata:
+  name: analytics-vpa
+  namespace: default
+spec:
+  targetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: analytics-deployment
+  updatePolicy:
+    updateMode: "Recreate"
+  resourcePolicy:
+    containerPolicies:
+    - containerName: "*"
+      controlledResources: ["cpu", "memory"]
+
+# -----------------
+# gateway
+# -------
+
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: web-gateway
+  namespace: nginx-gateway
+spec:
+  gatewayClassName: nginx
+  listeners:
+  - name: http
+    protocol: HTTP
+    port: 80
+    allowedRoutes:
+      namespaces:
+        from: Same
+
+# --------
+helm upgrade -n kk-ns kk-mock1 kk-mock1/podinfo --version 6.11.2
+
+# --------
+
+```