• Moving terraform resources to a new code base

  3 min read

  
  

  If we have a set of resources on a set of terraform code that we want to move to another code base, we could use terraform import to import them to the new state but this required make the effort to identify the resources to import. If are going to import the entire state we can make it much easier using terraform state pull and terraform state push

  30/09/2021

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• Kubernetes / AWS node termination handler: Drain spot instances that are about to be terminated

  3 min read

  If you are using a mixed policy on your EKS workers ASG you will want to install the AWS node termination handler to drain a node once AWS notifies that a particular spot instance is going to be reclaimed

  29/09/2021

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• How to build a multi architecture docker image using a github action

  3 min read

  Using buildx we can build multi architecture containers, we can use a github action to automatically build it

  28/09/2021

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• Inject a sidecar using KubeMod

  3 min read

  
  

  Using a webhook we can mutate Kubernetes objects when they are inserted to the cluster. But using a mutating operator can save us the trouble of having to actually code how the object needs to be patched

  27/09/2021

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• Pod hooks: postStart and preStop

  2 min read

  
  

  If we need to execute some actions at container startup of before stopping the container we can me use of the container lifecycle hooks

  24/09/2021

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• 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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• Failed to provision volume with StorageClass "gp3": invalid AWS VolumeType "gp3"

  3 min read

  If we try to provision a gp3 Volume using a PVC on an EKS cluster we might get the invalid AWS VolumeType "gp3" error. This means we are using an outdated EBS CSI

  21/09/2021

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• How to change the default StorageClass

  2 min read

  
  

  The default StorageClass is defined using the storageclass.kubernetes.io/is-default-class annotation as follows:

  apiVersion: storage.k8s.io/v1
  kind: StorageClass
  metadata:
    annotations:
      storageclass.kubernetes.io/is-default-class: "true"
  (...)
  

  To be able to change it we will have to removed from the current default and set it to the new one.

  20/09/2021

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• Monitoring the progress of dd

  2 min read

  For a long time we were not able to properly monitor the progress of a dd command unless we were using pv of having another process to periodically send a SIGUSR1 to the dd process

  17/09/2021

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• Using mixed_instances_policy to use Spot instances on an ASG

  3 min read

  If saving up to 90% for the same instance type is no reason enough to start using spot instances, to be able to use the same AutoScalingGroup to spawn both types of instances, saving us from the hassle of having to manage it by ourselves might help to change your mind

  16/09/2021

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