HON95-wiki/virt/k8s.md

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title: Kubernetes breadcrumbs:

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

Setup

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

Usage

• Config:
  • Show: kubectl config view
• Cluster:
  • Show basic info: kubectl cluster-info
• Nodes:
  • Show nodes: kubectl get nodes [-o wide]
  • Show node IP addresses: kubectl get nodes -o=custom-columns="NAME:.metadata.name,ADDRESSES:.status.addresses[?(@.type=='InternalIP')].address,PODCIDRS:.spec.podCIDRs[*]"
  • Show resource usage: kubectl top nodes
• Services:
  • Show: kubectl get services
• Pods:
  • Show pods from all namespaces: kubectl get pods -A [-o wide]
  • 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

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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