• Kubernetes: How to configure Deployment to evenly spread Pods across availability zones

  5 min read

  If you run Kubernetes workloads on AWS you want to make sure Pods are spread across all the available availability zones. To do so we can use podAntiAffinity to tell Kubernetes to avoid deploying all the Pods of the same deployment on the same AZ

  28/03/2022

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• Kubernetes running out of Pods

  2 min read

  
  

  If you try to run too many pods on a handful of nodes you might eventually run out of available Pods. Using kubectl get pods you'll see them marked with the status OutOfpods:

  $ kubectl get pods
  (...)
  test          deploy-test-84b4fdcbbd-59hvf            0/1     ContainerCreating   0                44s
  test          deploy-test-84b4fdcbbd-7dvs9            0/1     OutOfpods           0                62s
  test          deploy-test-84b4fdcbbd-btrwz            0/1     OutOfpods           0                4m16s
  test          deploy-test-84b4fdcbbd-gpkkg            0/1     OutOfpods           0                91s
  test          deploy-test-84b4fdcbbd-hbbdv            0/1     OutOfpods           0                67s
  test          deploy-test-84b4fdcbbd-j75x4            0/1     OutOfpods           0                68s
  test          deploy-test-84b4fdcbbd-s4qzz            0/1     OutOfpods           0                64s
  (...)
  

  11/03/2022

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• Troubleshooting a Pod by changing it's command

  3 min read

  
  

  When a container in a Pod is crashing sometimes it's logs are not enough to fully understand what's going on. One way to approach this situation the command it runs to something that won't make Kubernetes restart the container: For example a sleep command

  08/03/2022

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• The activeDeadlineSeconds property on a Pod definition

  3 min read

  
  

  If we take a look all the possible properties for a Pod definition we might notice that there's one to limit the time a Pod can be running:

  apiVersion: v1
  kind: Pod
  metadata:
    name: test
  spec:
    activeDeadlineSeconds: 10
    containers:
    - args:
      - sleep
      - 24h
      image: alpine
      name: test
  

  07/03/2022

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• bestby: Refresh Pods based on it's lifetime using a label on it's definition

  3 min read

  
  

  For Kubernetes a Deployment is an object to define a Pod that is intended to permanently run on the cluster, so there's no native way to refresh it's Pods. To do so we can install the bestby controller.

  04/03/2022

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