• Operator-SDK: Write a generic controller for an existing object

  2 min read

  
  

  With operator-sdk, it really makes it easy to create new CRD definitions and create the template to write the reconcile loop for it. But if we want to be able to handle changes on objects that are already present on the Kubernetes cluster (not a custom resources) we can create the Reconciler from scratch.

  22/12/2023

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• kubebuilder:printcolumn - Adding back the AGE column

  1 min read

  
  

  If we use //+kubebuilder:printcolumn to add fields to print with kubectl get we'll notice that the AGE colum goes away with it. We can use an additional //+kubebuilder:printcolumn to add the AGE column back.

  29/08/2023

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• Operator-SDK: Create a group of objects that can be queried together

  2 min read

  
  

  When you have several kubernetes objects (CRDs) that work together it can be useful to be able to query them all together to get a better idea of what's deployed without having to query all the individial resources. With operator-SDK we just need to annotate the objects.

  01/08/2023

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• Simplifying Input Parameters in Pulumi and AWS CDK Libraries

  2 min read

  
  

  Some libraries require you to use string pointers or custom objects for some input parameters, notable examples are Pulumi and AWS CDK. If we only need to provide some static value for it can be annoying to use.

  16/05/2023

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• Operator-SDK: Set custom fields for kubectl get

  2 min read

  
  

  When writing a custom Kubernetes operator using operator-sdk we might want to change the fields are show when running kubectl get:

  $ kubectl get example
  NAME   AGE
  demo   4h20m
  

  To do so, we'll need to add the additionalPrinterColumns field the the CustomResourceDefinition, but since we are using operator-sdk to take care of this, we'll need to use some annotations in the resource definition file.

  15/05/2023

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