HON95-wiki/virt/k8s.md

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title: Kubernetes breadcrumbs:

• title: Virtualization, Containerization and Orchestration --- {% include header.md %}

Using Debian.

Setup

1. TODO
2. (Optional) Setup command completion:
   • BASH (per-user): echo 'source <(kubectl completion bash)' >>~/.bashrc
   • ZSH (per-user): echo 'source <(kubectl completion zsh)' >>~/.zshrc
   • More info:
     • bash auto-completion (k8s docs)
     • zsh auto-completion (k8s docs)

Usage

• Config:
  • Show: kubectl config view
• Cluster:
  • Show: kubectl cluster-info
• Nodes:
  • Show kubectl get nodes
• Services:
  • Show: kubectl get services
• Pods:
  • Show: kubectl get pods [-A] [-o wide]
    • -A for all namespaces instead of just the current/default one.
    • -o wide for more info.
  • Show logs: kubectl logs <pod> [container]
• Manifests:
  • Show cluster state diff if a manifest were to be applied: kubectl diff -f <manifest-file>
• Events:
  • Show: kubectl get events

Notes and Best Practices

• k8s is the foundation for a platform-as-a-service (PaaS), but requires a ton of configuration if self-hosting/on-premise.
• TODO

Related Software

TODO

Alternative Variants

Minikube

Minikube is local Kubernetes, focusing on making it easy to learn and develop for Kubernetes.

Setup

1. See: minikube start (minikube docs)
2. Add kubectl symlink: sudo ln -s $(which minikube) /usr/local/bin/kubectl
3. Add command completion: See normal k8s setup instructions.

Usage

• Generally all of the normal k8s stuff applies.
• Generally sudo isn't required.
• Manage minikube cluster:
  • Start: minikube start
  • Pause (TODO what?): minikube pause
  • Stop: minikube stop
  • Delete (all clusters): minikube delete --all
• Set memory limit (requires restart): minikube config set memory <megabytes>
• Start and open web dashboard: minikube dashboard
• Show addons: minikube addons list

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