K8s初始入门

字数统计: 529阅读时长: 3 min

 2018/07/24 

kubernetes-bootcamp

The goal of this interactive scenario is to deploy a local development Kubernetes cluster using minikube

Create a Cluster

Cluster up and running

$ minikube version
    minikube version: v0.25.0


$ minikube start 

    There is a newer version of minikube available (v0.28.1).  Download it here:
    https://github.com/kubernetes/minikube/releases/tag/v0.28.1
    
    To disable this notification, run the following:
    minikube config set WantUpdateNotification false
    Starting local Kubernetes v1.9.0 cluster...
    Starting VM...
    Getting VM IP address...
    Moving files into cluster...
    Setting up certs...
    Connecting to cluster...
    Setting up kubeconfig...
    Starting cluster components...
    Kubectl is now configured to use the cluster.
    Loading cached images from config file.

$ kubectl  version
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.0", GitCommit:"925c127ec6b946659ad0fd596fa959be43f0cc05", GitTreeState:"clean", BuildDate:"2017-12-15T21:07:38Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"", Minor:"", GitVersion:"v1.9.0", GitCommit:"925c127ec6b946659ad0fd596fa959be43f0cc05", GitTreeState:"clean", BuildDate:"2018-01-26T19:04:38Z", GoVersion:"go1.9.1", Compiler:"gc", Platform:"linux/amd64"}

Cluster details

$ kubectl cluster-info
Kubernetes master is running at https://172.17.0.41:8443

$ kubectl get nodes
NAME      STATUS    ROLES     AGE       VERSION
host01    Ready     <none>    4m        v1.9.0

Deploy An App

Kubernetes Deployments
This provides a self-healing mechanism to address machine failure or maintenance.

Interactive Tutorial - Deploying an App

helm

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kubectl run kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1 --port=8080 //测试demo
kubectl run nginx-php-fpm --image=richarvey/nginx-php-fpm --port=80 //nginx-php-fpm 镜像
kubectl get deployments // 获取当前已经部署的应用列表

Explore Your App
- Viewing Pods and Nodes
  
  Pods are the atomic unit on the Kubernetes platform
  Containers should only be scheduled together in a single Pod if they are tightly coupled and need to share resources such as disk.
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  kubectl get pods //获取当前所有pods
  
  kubectl describe pods //描述当前pods
  kubectl exec -ti $POD_NAME bash //进入docker 交互

Expose Your App Publicly

Using a Service to Expose Your App

A Kubernetes Service is an abstraction layer which defines a logical set of Pods and enables external traffic exposure, load balancing and service discovery for those Pods.

helm

kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080
kubectl describe services/kubernetes-bootcamp 
kubectl get services/kubernetes-bootcamp -o go-template='{{(index .spec.ports 0).nodePort}}' //输出开放的端口号

Scale Your App

Running Multiple Instances of Your App