Kubernetes

Workflows

Custom dashboard in the terminal

• I create a dashboard in a tmux window with multiple panes
• Each pane has a kubectl prefixed with a watch command.
  • Examples
    • watch -d kubectl get pods -a
    • watch -d kubectl get jobs

Dashboards

• https://github.com/hjacobs/kube-ops-view

Maximum Nodes in Cluster

5000

• Updated: 2018-10-21
• Source: https://kubernetes.io/docs/setup/cluster-large/

One liner interactive shell in a pod deployment

Example: kubectl run -i --tty busybox --image=busybox -- sh

https://kubernetes.io/docs/reference/kubectl/cheatsheet/

Services do not ping

• https://github.com/kubernetes/kubernetes/issues/7996#issuecomment-299497122

  • Services do not ping.

    • @thockin
• https://stackoverflow.com/questions/50852542/kubernetes-cannot-ping-another-service

  • Ping doesn't work with service's cluster IPs like 10.233.14.157, as it is a virtual IP. You should be able to ping a specific pod, but no a service.

Sidecar container pattern

• https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/
  • https://kubernetes.io/blog/2015/06/the-distributed-system-toolkit-patterns/#example-1-sidecar-containers
  • https://kubernetes.io/blog/2016/06/container-design-patterns/
    • https://www.usenix.org/conference/hotcloud16/workshop-program/presentation/burns
      • https://www.usenix.org/system/files/conference/hotcloud16/hotcloud16_burns.pdf
      • https://www.usenix.org/sites/default/files/conference/protected-files/hotcloud16_slides_burns.pdf