• Kubernetes: Find deprecated API versions

    2 min read

    On a Kubernetes cluster we might have deprecated versions of the object, so after updating it we might end up with something not properly working:

    $ kubectl api-resources | grep Ingress\$
    ingresses                         ing              extensions/v1beta1                     true         Ingress
    ingresses                         ing              networking.k8s.io/v1                   true         Ingress
    

    23/09/2021

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  • Kubernetes: List all objects using get-all plugin

    2 min read

    If we need to take a look at the resources of a Kubernetes cluster, by using kubectl get all we won't be able to see all the resources. Most notably, it won't list Ingress objects. You can take a look at this issue for kubectl for the details but we won't be able to get all the resources using this command, we'll have to install the get-all krew plugin

    14/09/2021

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  • tree visualization of Kubernetes objects

    2 min read

    Some kubernetes objects creates and manages other kubernetes objects in order to provide it's functionality. For example, the Deployment object creates a ReplicaSet that in turn creates the desired Pod objects. We can always track down this relationship using kubectl describe but using the tree krew plugin we can see the relationship in a visual way. We can install it like so:

    $ kubectl krew install tree
    

    14/06/2021

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  • Installing kubectl plugin with krew: unused-pvc

    2 min read

    Krew is a plugin manager for kubectl (v1.12 or higher), we will need to install krew first. To be able to test the unused-volumes plugin we will have to create a PersistentVolumeClaim that we won't use on any pot:

    apiVersion: v1
    kind: PersistentVolumeClaim
    metadata:
      name: demo-pvc
      namespace: kube-system
    spec:
      accessModes:
        - ReadWriteOnce
      resources:
        requests:
          storage: 10Gi
    

    13/01/2021

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From pet to cattle
Treat your kubernetes clusters like cattle, not pets