kubernetes-cheatsheet.md

minikube

!!!! USE DOCKER_FOR_MAC with KUBERNETES instead (hostPath is working in this one)

update

minikube update-check minikube delete

Alternative provisioner instead of k8s.io/minikube-hostpath:

• delete default storage class: kubectl delete storageclass standard

• creat following storage class:

  apiVersion: storage.k8s.io/v1
  kind: StorageClass
  metadata:
    name: standard
  provisioner: docker.io/hostpath
  reclaimPolicy: Retain
  

  instead of the original:

  {
    "kind": "StorageClass",
    "apiVersion": "storage.k8s.io/v1",
    "metadata": {
      "name": "standard",
      "selfLink": "/apis/storage.k8s.io/v1/storageclasses/standard",
      "uid": "749a90b6-fd4e-11e8-a910-080027c8f877",
      "resourceVersion": "390",
      "creationTimestamp": "2018-12-11T14:10:04Z",
      "labels": {
        "addonmanager.kubernetes.io/mode": "Reconcile"
      },
      "annotations": {
        "kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"storage.k8s.io/v1\",\"kind\":\"StorageClass\",\"metadata\":{\"annotations\":{\"storageclass.beta.kubernetes.io/is-default-class\":\"true\"},\"labels\":{\"addonmanager.kubernetes.io/mode\":\"Reconcile\"},\"name\":\"standard\",\"namespace\":\"\"},\"provisioner\":\"k8s.io/minikube-hostpath\"}\n",
        "storageclass.beta.kubernetes.io/is-default-class": "true"
      }
    },
    "provisioner": "k8s.io/minikube-hostpath",
    "reclaimPolicy": "Delete",
    "volumeBindingMode": "Immediate"
  }
  

Check that the kubectl client and server versions match () kubectl version --short=true

run

minikube status minikube stop minikube start

minikube start --kubernetes-version v1.13.0

connect to minikube vm

minikube ssh

dashboard

minikube dashboard

urls

minikube service <SERVICE_NAME> --url

mount with permissions

minikube mount --uid 26 --gid 26 --9p-version=9p2000.L ~/Projects/cdev/data:/pgdata

!!! hard links won't work (postgress cannot be used with it)

minikube and docker

docker builds the images in the minikube environment

eval $(minikube docker-env)

docker builds the images on the host

eval $(docker-machine env -u)

kubectl

kubectl config current-context

kubectl cluster-info

kubectl get nodes

kubectl exec -it --namespace -- /bin/bash

docker for mac:

• install the dashboard: kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

• find out the pod name: kubectl get pods --namespace=kube-system

• setup portforwarding for that pod: kubectl port-forward —-namespace=kube-system 8443:8443

spring-boot

passing command line arguments to the app: mvn clean install spring-boot:run -pl application -DskipTests -Drun.jvmArguments="-Dspring.profiles.active=local"