Java web 之kubernetes部署一、摘要本篇将之前的helloworldwar部署到kubernetes集群

一、摘要

本篇将之前的helloworld war 部署到kubernetes集群中，并可以被外部访问

二、架构图

核心概念解释查看阿里云k8s运维 lixiang的分享

www.infoq.cn/article/KNM…

三、部署步骤

构建本地image，push到docker 仓库

下面时helloworld 的image构建dockerfile

From tomcat:latest
WORKDIR /usr/local/tomcat/webapps
ADD webdemo-1.0-SNAPSHOT webdemo-1.0-SNAPSHOT
EXPOSE 80

k8s集群创建时需要拉取远程docker image 文件，故需要先推送本地镜像push到hub

docker用户名/image名:tag

docker build -t="venusforest2013/war_demo:v1" .
docker push venusforest2013/war_demo

编写k8s.yaml文件，创建k8s集群

创建命令如下

kubectl create -f k8s.yaml

创建k8s集群的yaml文件

kind: Deployment

apiVersion: apps/v1

metadata:

labels:

app: forestwar

name: forestwar

namespace: default

spec:

replicas: 1

selector:

matchLabels:

app: forestwar

template:

metadata:

labels:

app: forestwar

# Comment the following annotation if Dashboard must not be deployed on master

annotations:

scheduler.alpha.kubernetes.io/tolerations: |

[

{

"key": "dedicated",

"operator": "Equal",

"value": "master",

"effect": "NoSchedule"

}

]

spec:

containers:

- name: forestwar

image: venusforest2013/war_demo:v1

imagePullPolicy: Always

ports:

- containerPort: 80

protocol: TCP

---

kind: Service

apiVersion: v1

metadata:

labels:

app: forestwar

name: forestwar

namespace: default

spec:

type: NodePort

ports:

- port: 80

targetPort: 8080

selector:

app: forestwar

查看k8s集群

kubectl get pods --all-namespaces

Kubectl get deployments

Kubectl get services

验证

四、其他常用kubectl操作

创建k8s dashboard

Kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/v1.5.1/src/deploy/kubernetes-dashboard.yaml

版本查看

kubectl version

查看pod详细信息

kubectl describe pod kubernetes-dashboard -n kube-system

查看k8s cluster info

kubectl cluster-info

查看node信息

kubectl get nodes

查看特定namespace下的pod信息

get pods --namespace=kube-system

Kubectl dashboard使用

命令行创建

Kubectl proxy

kubectl port-forward kubernetes-dashboard-9746c5f4c-j2mbl -n kube-system 8001

浏览器打开

http://localhost:8001/ui

命令行创建niginx deployment

kubectl run hello-nginx --image=nginx --port=80

命令行暴露服务

kubectl expose deployment hello-nginx --type=NodePort

Kubectl get deployments

Kubectl get services

kubectl scale --replicas=3 deployment/hello-nginx

删除service

Kubectl delete service xxx

删除 deployment

Kubectl delete deployment

Java web 之kubernetes部署

一、摘要

二、架构图

三、部署步骤

四、其他常用kubectl操作

五、参考