CKA Kind Lab.

Follow me on twitter @mauilion
important links

• cloudnative.tv
• eCHO
• certs magic with Saiyam debuting on cloudnative.tv today!
• klustered
• kind.sigs.k8s.io

find this stuff here hackmd.io/@mauilion/cka-lab

Watch the video

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• Curriculum! https://github.com/cncf/curriculum/blob/master/CKA_Curriculum_v1.19.pdf

• What's kind?

• Do I need Kind? is kind part of the cka test?

  • No it's not part of the test. It just makes it simple to have a lab environment with no cloud access needed!

• What's a kubeadm?

  • https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

• How does Kind use kubeadm?

  • https://kind.sigs.k8s.io/docs/user/configuration/

• How can I use kind as a learning tool for cluster administration?

  • kind cluster create with multiple nodes
    • git.io/kind-mn-nocni.yaml
  • Reset of all nodes
    • kubeadm reset -f
  • Using the kubeadm config to reform the cluster manually with kubeadm init and join
    • kubeadm init –config /kind/kubeadm.conf –skip-phases=preflight
  • Using kubeadm to replace the config of the apiserver with its defaults
    • kubeadm phase
  • What do we need to know to install a cni?
  • Installing a cni
    • cilium install

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• etcd hijinx! git.io/etcdclient.yaml

  • what is it?

  • how to use it?

  • Grabbing a snapshot of etcd.

    • Super low cost backup
    • also you can use the data dir!

  • Restoring a snapshot of etcd.

    • stop all the things!
    • use etcdctl to restore the path etcd expects to find things
    • restart all the things!
    • profit!

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• upgrading with kubeadm!
  • we need a new kubeadm and kubelet! but what version: https://dl.k8s.io/release/stable.txt
  • and where? https://dl.k8s.io/v1.19.2/bin/linux/amd64/{kubeadm,kubelet}
  • docs on upgrade are here: https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

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• Other tips!
  • kubectl explain pod.spec –recursive