02-Lightning-Lab-1.md

Lightining Lab 1

• I am ready! Take me to Lightning Lab 1

Solution to LL-1

1. Use below commands step-by-step as mentioned:

   On Controlplane Node:-
   
   kubectl drain controlplane --ignore-daemonsets
   apt-get install kubeadm=1.20.0-00
   kubeadm  upgrade plan
   kubeadm  upgrade apply v1.20.0
   apt-get install kubelet=1.20.0-00
   systemctl daemon-reload
   systemctl restart kubelet
   kubectl uncordon controlplane
   kubectl drain node01 --ignore-daemonsets
   
   
   On Worker Node:-
   
   apt-get update
   apt-get install kubeadm=1.20.0-00
   kubeadm upgrade node
   apt-get install kubelet=1.20.0-00
   systemctl daemon-reload
   systemctl restart kubelet     
   
   Back on Controlplane Node:-
   
   kubectl uncordon node01
   kubectl get pods -o wide | grep gold (make sure this is scheduled on controlplane node)
   

2. Execute below command:

   kubectl -n admin2406 get deployment -o custom-columns=DEPLOYMENT:.metadata.name,CONTAINER_IMAGE:.spec.template.spec.containers[].image,READY_REPLICAS:.status.readyReplicas,NAMESPACE:.metadata.namespace --sort-by=.metadata.name > /opt/admin2406_data
   

3. Use below command and fix the issue:

   Make sure the port for the kube-apiserver is correct.
   
   Change port from 2379 to 6443 using below command
   
   vi /root/CKA/admin.kubeconfig
   
   Now replace the port 2379 with 6443
   
   Run:
   
   kubectl cluster-info --kubeconfig /root/CKA/admin.kubeconfig
   

4. Use below command for the solution:

   kubectl create deployment nginx-deploy --image=nginx:1.16
   kubectl set image deployment/nginx-deploy nginx=nginx:1.17 --record
   

5. Apply/refer below yaml to create a PersistentVolumeClaim:

   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: mysql-alpha-pvc
     namespace: alpha
   spec:
     accessModes:
     - ReadWriteOnce
     resources:
       requests:
         storage: 1Gi
     storageClassName: slow
   

6. Execute below command for etcd backup:

   ETCDCTL_API='3' etcdctl snapshot save --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key --endpoints=127.0.0.1:2379 /opt/etcd-backup.db
   

7. Apply below manifest for the solution:

   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: null
     labels:
       run: secret-1401
     name: secret-1401
     namespace: admin1401
   spec:
     volumes:
     - name: secret-volume
       secret:
         secretName: dotfile-secret
     containers:
     - command:
       - sleep
       args:
       - "4800"
       image: busybox
       name: secret-admin
       volumeMounts:
       - name: secret-volume
         readOnly: true
         mountPath: "/etc/secret-volume"