Fix a node that shows as non-ready

• A.Kubectl get nodes
  // Check which node shows a not ready
  kubectl describe nodes "node-name"
  // Login to the node which shows as not ready and check the
  process for kubelet, docker , kube-proxy.
  // systemctl status kubelet (or) ps -aux | grep -i "processname"
  // If the process is not started, then start using
  systemctl start kubelet / docker
  // Verify
  ps -auxxww | grep -i "process-name"
  kubectl get nodes
• B.Kubectl get nodes
  // Check which node shows a not ready
  kubectl describe nodes "node-name"
  // Login to the node which shows as not ready and check the
  systemctl start kubelet / docker
  // Verify
  ps -auxxww | grep -i "process-name"
  kubectl get nodes

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List all service account and create a service account called "admin"

• A.kubectl get sa
  kubectl get sa --all-namespaces
  kubectl create sa admin
  //Verify
  kubectl get sa admin -o yaml
• B.kubectl get sa
  kubectl get sa --all-namespaces
  //Verify
  kubectl get sa admin -o yaml

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Undo the deployment to the previous version 1.17.1 and verify Image has the previous version

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Create a deployment spec file that will:
* Launch 7 replicas of the nginx Image with the labelapp_runtime_stage=dev
* deployment name: kual00201
Save a copy of this spec file to /opt/KUAL00201/spec_deployment.yaml
(or /opt/KUAL00201/spec_deployment.json).
When you are done, clean up (delete) any new Kubernetes API object that you produced during this task.

Correct Answer:

See the solution below.
Explanation
solution

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For this item, you will have to ssh to the nodes ik8s-master-0 and ik8s-node-0 and complete all tasks on these nodes. Ensure that you return to the base node (hostname: node-1) when you have completed this item.
Context
As an administrator of a small development team, you have been asked to set up a Kubernetes cluster to test the viability of a new application.
Task
You must use kubeadm to perform this task. Any kubeadm invocations will require the use of the
--ignore-preflight-errors=all option.
* Configure the node ik8s-master-O as a master node. .
* Join the node ik8s-node-o to the cluster.

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