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Automate Kubectl with PowerShell

You can use PowerShell in combination with the kubectl CLI tool to automate many operations against a Kubernetes cluster.

  • Retrieve a list of all Kubernetes Pods, across all Namespaces in the cluster.
  • Use the --output parameter to return the results as JSON.
  • Use the built-in ConvertFrom-Json command in PowerShell to interpret the JSON text as objects.
kubectl get pods --all-namespaces --output=json | ConvertFrom-Json

Next, assign the resulting objects to a variable and echo the object.

$PodList = kubectl get pods --all-namespaces --output=json | ConvertFrom-Json

Notice that there is an items child property, so retrieve that, and reassign the variable.

$PodList = $PodList.items

How many Pods do you have running on your Kubernetes cluster?


How many Pods are running in each Kubernetes Namespace?

$PodList | Group-Object -Property { $PSItem.metadata.namespace }

How many Pods have calico in their names?

$PodList | Where-Object -FilterScript { $ -match 'calico' } | Measure-Object