Kubernetes

Overview
Commands
Clearing
Installation and management
References

Overview

Kubernetes is an open-source container orchestration system for automating software deployment, scaling, and management. Originally designed by Google, the project is now maintained by a worldwide community of contributors, and the trademark is held by the Cloud Native Computing Foundation. https://en.wikipedia.org/wiki/Kubernetes

Commands

kubectl cluster-info

kubectl get nodes
kubectl get nodes --output wide
kubectl --kubeconfig [USER_CLUSTER_KUBECONFIG] get nodes --output wide

kubectl get all

kubectl get pods
kubectl get replicasets
kubectl get services
kubectl get secrets

kubectl get ingress -o wide (дает ingress сервисы )

kubectl get svc --all-namespaces kubectl get services --all-namespaces (сервисы во всех неймспесах)

kubectl get endpoints
kubectl get events
kubectl get storageclasses

kubectl config view

Clearing

kubectl delete pod pod-nginx

kubectl delete pod --all

kubectl get all

kubectl delete [deploy/simple-deployment] [svc/simple-service]

All

kubectl delete deployment --all

kubectl delete service --all

kubectl delete daemonsets,replicasets,services,deployments,pods,rc --all

kubectl delete ingress --all

kubectl delete namespace k8sdemo-app

kubectl delete -f file.yaml

https://github.com/kubernetes/kubernetes/issues/60807

kubectl get namespace "stucked-namespace" -o json \
            | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" \
            | kubectl replace --raw /api/v1/namespaces/stucked-namespace/finalize -f -

kubectl get namespace "ingress-controller" -o json | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" | kubectl replace --raw /api/v1/namespaces/ingress-controller/finalize -f -

kubectl get namespace "cattle-system" -o json | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" | kubectl replace --raw /api/v1/namespaces/cattle-system/finalize -f -

Installation and management

Windows Docker Desktop

WSL - the Windows Subsystem for Linux

https://kubernetes.io/blog/2020/05/21/wsl-docker-kubernetes-on-the-windows-desktop/

https://docs.microsoft.com/en-us/windows/wsl/install-win10

https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/quick-start/quick-create-virtual-machine

(PowerShell admin mode)

PS C:\WINDOWS\system32> minikube delete 
PS C:\WINDOWS\system32> kubectl config use-context minikube
PS C:\WINDOWS\system32> minikube start --vm-driver=hyperv

minikube status

If you have enough CPU and RAM resources, you can easily have both minikube and docker-for-desktop on the same machine and switch between them by selecting context, for example: https://codefresh.io/kubernetes-tutorial/local-kubernetes-windows-minikube-vs-docker-desktop/#:~:text=Docker-for-windows uses Type,while Minikube supports both hypervisors.&text=If you are running virtual,you enable type-1 hypervisors.

> kubectl config get-contexts
> kubectl config use-context docker-for-desktop

https://www.assistanz.com/installing-minikube-on-windows-10-home-edition-using-virtualbox/ minikube start

minikube version

minikube status

minikube docker-env

2.4

docker run -d --restart=unless-stopped \
  -p 80:80 -p 443:443 --name rancher \
  -v /mnt/devops/rancher:/var/lib/rancher \
  rancher/rancher:v2.4-head

System requirements: 1CPU/4RAM - 2CPU/4RAM

2.5

docker run -d --restart=unless-stopped \
  -p 80:80 -p 443:443 --name rancher \
  -v /mnt/devops/rancher:/var/lib/rancher \
  --privileged \
  rancher/rancher:latest

Dionext software development notes

Kubernetes

Overview

Commands

Clearing

Installation and management

Windows Docker Desktop

Linux

Helm

Rancher

References