Advanced Kubectl Commands Solution

  • Get the list of nodes in JSON format and store it in a file at /opt/outputs/nodes.json.
Use the command kubectl get nodes -o json > /opt/outputs/nodes.json
  • Get the details of the node node01 in json format and store it in the file /opt/outputs/node01.json.
Use the command kubectl get node node01 -o json > /opt/outputs/node01.json
  • Use JSON PATH query to fetch node names and store them in /opt/outputs/node_names.txt.

Remember the file should only have node names.

Use the command kubectl get nodes -o=jsonpath='{.items[*].metadata.name}' > /opt/outputs/node_names.txt
  • Use JSON PATH query to retrieve the osImages of all the nodes and store it in a file /opt/outputs/nodes_os.txt.

The osImage is under the nodeInfo section under status of each node.

Use the command kubectl get nodes -o jsonpath='{.items[*].status.nodeInfo.osImage}' > /opt/outputs/nodes_os.txt
  • A kube-config file is present at /root/my-kube-config. Get the user names from it and store it in a file /opt/outputs/users.txt.

Use the command kubectl config view –kubeconfig=/root/my-kube-config to view the custom kube-config.

Use the command kubectl config view --kubeconfig=my-kube-config  -o jsonpath="{.users[*].name}" > /opt/outputs/users.txt
  • A set of Persistent Volumes are available. Sort them based on their capacity and store the result in the file /opt/outputs/storage-capacity-sorted.txt.
Use the command kubectl get pv --sort-by=.spec.capacity.storage > /opt/outputs/storage-capacity-sorted.txt
  • That was good, but we don’t need all the extra details. Retrieve just the first 2 columns of output and store it in /opt/outputs/pv-and-capacity-sorted.txt.

The columns should be named NAME and CAPACITY. Use the custom-columns option and remember, it should still be sorted as in the previous question.

Use the command kubectl get pv --sort-by=.spec.capacity.storage -o=custom-columns=NAME:.metadata.name,CAPACITY:.spec.capacity.storage > /opt/outputs/pv-and-capacity-sorted.txt
  • Use a JSON PATH query to identify the context configured for the aws-user in the my-kube-config context file and store the result in /opt/outputs/aws-context-name.
Use the command kubectl config view --kubeconfig=my-kube-config -o jsonpath="{.contexts[?(@.context.user=='aws-user')].name}" > /opt/outputs/aws-context-name

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