1st lesson

kubernetes/1/backup-cronjob.yaml

@@ -0,0 +1,15 @@
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: backup-cronjob
+spec:
+  schedule: "*/2 * * * *"
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          containers:
+          - name: backup
+            image: docker.io/busybox:latest
+            command: ["/bin/sh", "-c", "echo 'Backup complete' && sleep 5"]
+          restartPolicy: Never

kubernetes/1/data-process-job.yaml

@@ -0,0 +1,12 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: data-process-job
+spec:
+  template:
+    spec:
+      containers:
+      - name: data-process
+        image: docker.io/busybox:latest
+        command: ["/bin/sh", "-c", "echo 'Data processed' && sleep 5"]
+      restartPolicy: Never

kubernetes/1/fluentd-daemonset.yaml

@@ -0,0 +1,23 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: fluentd
+  labels:
+    app: fluentd
+spec:
+  selector:
+    matchLabels:
+      app: fluentd
+  template:
+    metadata:
+      labels:
+        app: fluentd
+    spec:
+      containers:
+      - name: fluentd
+        image: docker.io/fluent/fluentd:latest
+        resources:
+          limits:
+            memory: "200Mi"
+          requests:
+            memory: "100Mi"

kubernetes/1/nginx-deployment-update.yaml

@@ -0,0 +1,26 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: docker.io/nginx:1.23.3
+        ports:
+        - containerPort: 80

kubernetes/1/nginx-deployment.yaml

@@ -0,0 +1,26 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: docker.io/nginx:latest
+        ports:
+        - containerPort: 80

kubernetes/1/nginx-pod.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx-pod
+  labels:
+    app: nginx
+spec:
+  containers:
+  - name: nginx
+    image: docker.io/nginx:latest
+    ports:
+    - containerPort: 80

kubernetes/1/nginx-replicaset.yaml

@@ -0,0 +1,24 @@
+apiVersion: apps/v1
+kind: ReplicaSet
+metadata:
+  name: nginx-replicaset
+  labels:
+    app: nginx-rs
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app: nginx-rs
+  template:
+    metadata:
+      labels:
+        app: nginx-rs
+    spec:
+      containers:
+      - name: nginx
+        image: docker.io/nginx:latest
+        ports:
+        - containerPort: 8080
+        env:
+        - name: NGINX_PORT
+          value: "8080"

kubernetes/1/nginx-service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-rs-service
+spec:
+  selector:
+    app: nginx-rs
+  ports:
+  - protocol: TCP
+    port: 8080
+    targetPort: 80
+  type: ClusterIP

kubernetes/1/redis-service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis-service
+spec:
+  clusterIP: None
+  selector:
+    app: redis
+  ports:
+  - protocol: TCP
+    port: 6379
+    targetPort: 6379

kubernetes/1/redis-statefulset.yaml

@@ -0,0 +1,33 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: redis
+  labels:
+    app: redis
+spec:
+  serviceName: redis-service
+  replicas: 3
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+      - name: redis
+        image: docker.io/redis:latest
+        ports:
+        - containerPort: 6379
+        volumeMounts:
+        - name: redis-data
+          mountPath: /data
+  volumeClaimTemplates:
+  - metadata:
+      name: redis-data
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      resources:
+        requests:
+          storage: 1Gi

kubernetes/1/task1.txt

@@ -0,0 +1,107 @@
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ kubectl get nodes
+NAME          STATUS   ROLES           AGE     VERSION
+k8s-master0   Ready    control-plane   6d23h   v1.34.1
+k8s-master1   Ready    control-plane   6d23h   v1.34.1
+k8s-master2   Ready    control-plane   6d23h   v1.34.1
+k8s-worker0   Ready    <none>          6d23h   v1.34.1
+k8s-worker1   Ready    <none>          6d23h   v1.34.1
+k8s-worker2   Ready    <none>          6d23h   v1.34.1
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ cat nginx-pod.yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx-pod
+  labels:
+    app: nginx
+spec:
+  containers:
+  - name: nginx
+    image: docker.io/nginx:latest
+    ports:
+    - containerPort: 80
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ kubectl port-forward pod/nginx-pod 8080:80 &
+[1] 617748
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ Forwarding from 127.0.0.1:8080 -> 80
+curl -IL localhost:8080
+Handling connection for 8080
+HTTP/1.1 200 OK
+Server: nginx/1.29.2
+Date: Thu, 09 Oct 2025 11:50:08 GMT
+Content-Type: text/html
+Content-Length: 615
+Last-Modified: Tue, 07 Oct 2025 17:04:07 GMT
+Connection: keep-alive
+ETag: "68e54807-267"
+Accept-Ranges: bytes
+
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ kubectl describe pod nginx-pod
+Name:             nginx-pod
+Namespace:        default
+Priority:         0
+Service Account:  default
+Node:             k8s-worker2/192.168.88.229
+Start Time:       Thu, 09 Oct 2025 12:34:45 +0300
+Labels:           app=nginx
+Annotations:      <none>
+Status:           Running
+IP:               10.244.5.5
+IPs:
+  IP:  10.244.5.5
+Containers:
+  nginx:
+    Container ID:   cri-o://d4afd0e4cc9d1f475663fdccc6694b7fdd7841d212feccc5c03a435ecd729733
+    Image:          docker.io/nginx:latest
+    Image ID:       docker.io/library/nginx@sha256:35fabd32a7582bed5da0a40f41fd4984df7ddff32f81cd6be4614d07240ec115
+    Port:           80/TCP
+    Host Port:      0/TCP
+    State:          Running
+      Started:      Thu, 09 Oct 2025 12:34:55 +0300
+    Ready:          True
+    Restart Count:  0
+    Environment:    <none>
+    Mounts:
+      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-27hx7 (ro)
+Conditions:
+  Type                        Status
+  PodReadyToStartContainers   True 
+  Initialized                 True 
+  Ready                       True 
+  ContainersReady             True 
+  PodScheduled                True 
+Volumes:
+  kube-api-access-27hx7:
+    Type:                    Projected (a volume that contains injected data from multiple sources)
+    TokenExpirationSeconds:  3607
+    ConfigMapName:           kube-root-ca.crt
+    Optional:                false
+    DownwardAPI:             true
+QoS Class:                   BestEffort
+Node-Selectors:              <none>
+Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
+                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
+Events:                      <none>
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ kubectl logs nginx-pod
+/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
+/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
+/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
+10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
+10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
+/docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh
+/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
+/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
+/docker-entrypoint.sh: Configuration complete; ready for start up
+2025/10/09 09:34:55 [notice] 1#1: using the "epoll" event method
+2025/10/09 09:34:55 [notice] 1#1: nginx/1.29.2
+2025/10/09 09:34:55 [notice] 1#1: built by gcc 14.2.0 (Debian 14.2.0-19) 
+2025/10/09 09:34:55 [notice] 1#1: OS: Linux 6.8.0-84-generic
+2025/10/09 09:34:55 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
+2025/10/09 09:34:55 [notice] 1#1: start worker processes
+2025/10/09 09:34:55 [notice] 1#1: start worker process 24
+2025/10/09 09:34:55 [notice] 1#1: start worker process 25
+2025/10/09 09:34:55 [notice] 1#1: start worker process 26
+2025/10/09 09:34:55 [notice] 1#1: start worker process 27
+127.0.0.1 - - [09/Oct/2025:09:35:17 +0000] "GET / HTTP/1.1" 200 615 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:143.0) Gecko/20100101 Firefox/143.0" "-"
+2025/10/09 09:35:17 [error] 24#24: *1 open() "/usr/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "127.0.0.1:8080", referrer: "http://127.0.0.1:8080/"
+127.0.0.1 - - [09/Oct/2025:09:35:17 +0000] "GET /favicon.ico HTTP/1.1" 404 153 "http://127.0.0.1:8080/" "Mozilla/5.0 (X11; Linux x86_64; rv:143.0) Gecko/20100101 Firefox/143.0" "-"
+127.0.0.1 - - [09/Oct/2025:11:50:08 +0000] "HEAD / HTTP/1.1" 200 0 "-" "curl/8.5.0" "-"
+grape@lonetrek:~/Documents/devops/devops/kubernetes$

kubernetes/1/task2.txt

@@ -0,0 +1,59 @@
+grape@lonetrek:~/Documents/devops/devops/kubernetes$ kubectl apply -f nginx-deployment.yaml
+deployment.apps/nginx-deployment created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get pods
+NAME                                READY   STATUS    RESTARTS   AGE
+nginx-deployment-7964487d9f-6lx6z   1/1     Running   0          8m26s
+nginx-deployment-7964487d9f-8thgv   1/1     Running   0          8m26s
+nginx-deployment-7964487d9f-lh2lp   1/1     Running   0          8m26s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get deployment nginx-deployment
+NAME               READY   UP-TO-DATE   AVAILABLE   AGE
+nginx-deployment   3/3     3            3           9m10s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f nginx-deployment-update.yaml
+deployment.apps/nginx-deployment configured
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl rollout status deployment/nginx-deployment
+Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
+Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
+Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
+Waiting for deployment "nginx-deployment" rollout to finish: 2 out of 3 new replicas have been updated...
+Waiting for deployment "nginx-deployment" rollout to finish: 1 old replicas are pending termination...
+Waiting for deployment "nginx-deployment" rollout to finish: 1 old replicas are pending termination...
+Waiting for deployment "nginx-deployment" rollout to finish: 1 old replicas are pending termination...
+Waiting for deployment "nginx-deployment" rollout to finish: 2 of 3 updated replicas are available...
+deployment "nginx-deployment" successfully rolled out
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl rollout history deployment/nginx-deployment
+deployment.apps/nginx-deployment 
+REVISION  CHANGE-CAUSE
+1         <none>
+2         <none>
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano nginx-replicaset.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f nginx-replicaset.yaml
+replicaset.apps/nginx-replicaset created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get replicaset nginx-replicaset
+NAME               DESIRED   CURRENT   READY   AGE
+nginx-replicaset   5         5         5       10s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get pods
+NAME                                READY   STATUS    RESTARTS   AGE
+nginx-deployment-5fd9874647-phdtg   1/1     Running   0          16m
+nginx-deployment-5fd9874647-pm58m   1/1     Running   0          16m
+nginx-deployment-5fd9874647-z5cnq   1/1     Running   0          16m
+nginx-replicaset-44w72              1/1     Running   0          14s
+nginx-replicaset-7dpqk              1/1     Running   0          14s
+nginx-replicaset-jkphz              1/1     Running   0          14s
+nginx-replicaset-p2fhv              1/1     Running   0          14s
+nginx-replicaset-qzsxv              1/1     Running   0          14s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano nginx-service.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f nginx-service.yaml
+service/nginx-rs-service created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl port-forward service/nginx-rs-service 8080:8080
+Forwarding from 127.0.0.1:8080 -> 80
+Handling connection for 8080
+grape@lonetrek:~$ curl -IL 127.0.0.1:8080
+HTTP/1.1 200 OK
+Server: nginx/1.29.2
+Date: Sun, 12 Oct 2025 11:49:03 GMT
+Content-Type: text/html
+Content-Length: 615
+Last-Modified: Tue, 07 Oct 2025 17:04:07 GMT
+Connection: keep-alive
+ETag: "68e54807-267"
+Accept-Ranges: bytes

kubernetes/1/task3.txt

@@ -0,0 +1,39 @@
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano fluentd-daemonset.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f fluentd-daemonset.yaml
+daemonset.apps/fluentd created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get pods
+NAME                                READY   STATUS              RESTARTS   AGE
+fluentd-f4trd                       0/1     ContainerCreating   0          20s
+fluentd-qzjnt                       0/1     ContainerCreating   0          20s
+fluentd-tpmpw                       0/1     ContainerCreating   0          20s
+nginx-deployment-5fd9874647-phdtg   1/1     Running             0          119m
+nginx-deployment-5fd9874647-pm58m   1/1     Running             0          118m
+nginx-deployment-5fd9874647-z5cnq   1/1     Running             0          119m
+nginx-replicaset-44w72              1/1     Running             0          102m
+nginx-replicaset-7dpqk              1/1     Running             0          102m
+nginx-replicaset-jkphz              1/1     Running             0          102m
+nginx-replicaset-p2fhv              1/1     Running             0          102m
+nginx-replicaset-qzsxv              1/1     Running             0          102m
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano redis-statefulset.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f redis-statefulset.yaml
+statefulset.apps/redis created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano data-process-job.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f data-process-job.yaml
+job.batch/data-process-job created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get jobs
+NAME               STATUS     COMPLETIONS   DURATION   AGE
+data-process-job   Complete   1/1           14s        57s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl logs -l job-name=data-process-job
+Data processed
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ nano backup-cronjob.yaml
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl apply -f backup-cronjob.yaml
+cronjob.batch/backup-cronjob created
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get cronjobs
+NAME             SCHEDULE      TIMEZONE   SUSPEND   ACTIVE   LAST SCHEDULE   AGE
+backup-cronjob   */2 * * * *   <none>     False     0        <none>          22s
+grape@lonetrek:~/Documents/devops/devops/kubernetes/1$ kubectl get jobs
+NAME                      STATUS     COMPLETIONS   DURATION   AGE
+backup-cronjob-29337938   Complete   1/1           14s        4m13s
+backup-cronjob-29337940   Complete   1/1           11s        2m13s
+backup-cronjob-29337942   Complete   1/1           12s        13s
+data-process-job          Complete   1/1           14s        7m34s