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Quick-kubectl.md

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Advanced Kubectl commands

Aliases for the exam

export do='--dry-run=client -o yaml'
export now='--force --grace-period 0'
export yl='-o yaml'
export kn='-n kube-system'
  • Get json values
kubectl get nodes -o json
  • Use json path to get node names
kubectl get nodes -o=jsonpath='{.items[*].metadata.name}'
  • get all users kubeconfig
kubectl config view --kubeconfig=/root/my-kube-config -o jsonpath='{.users[*].name}'
  • sort pv by storage capacity
kubectl get pv --sort-by=spec.capacity.storage
  • getting output with custom columns and names
kubectl get pv --sort-by=spec.capacity.storage -o custom-columns=NAME:.metadata.name,CAPACITY:.spec.capacity.storage
  • find name of context of user aws-user
kubectl config view --kubeconfig=my-kube-config -o jsonpath="{.contexts[?(@.context.user=='aws-user')].name}"
  • create a pod and expose it (make svc automatic)
kubectl run httpd --image=httpd:alpine --port=80 --expose
  • Get deployment name, replicasready and order by deployment name with custom columns
kubectl get deploy -o custom-columns=DEPLOYMENT:.metadata.name,CONTAINER:.spec.template.spec.containers[0].image,REPLICAS_READY:.status.readyReplicas --sort-by=.metadata.name
  • Set selector of svc
kubectl set selector --local -f - 'tier=messaging'