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获取源码并加载环境spring-cloud-kubernetes下的示例mac minikube 本地构建执行SpringCloud-Kubernetes-Example
文章背景#xff1a; 2019年开始 SpringCloud 开始向 K8S容器化流程演变#xff0c;逐步诞生了【Spring-Cloud-Kubernetes】 环境要求
获取源码并加载环境spring-cloud-kubernetes下的示例mac minikube 本地构建执行SpringCloud-Kubernetes-Example
文章背景 2019年开始 SpringCloud 开始向 K8S容器化流程演变逐步诞生了【Spring-Cloud-Kubernetes】 环境要求
maven 3.jdk17
获取源码并加载环境
从github仓库获取源码
git clone https://github.com/spring-cloud/spring-cloud-kubernetes.git 导入IDEA后确认以下构建环境
maven 3.jdk17当前springcloudkubernetes版本3.1.0-SNAPSHOTspring-cloud-build 4.1.0-SNAPSHOT
由于代码涉及snapshot库的代码拉取体现Spring全家桶的协同需要关注项目根目录下的.setting文件作为一般本地maven文件的补充主要关注仓库部分构建的时候可以直接选定这个setting文件消除全项目红波浪线的问题。
确认以上环境后
./mvnw clean package -Dmaven.test.skiptrue保持网络通畅期间会需要连接docker现在打包工具确定JRE版本下载JRE版本打包到镜像仓库等动作。
spring-cloud-kubernetes下的示例
使用spring-cloud-kubernetes下的example体验springcloud与kubernetes的融合与互动
/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-leader-election-examplemvn spring-boot:build-image -Dspring-boot.build-image.imageNameorg/kubernetes-leader-election-example:~$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
busybox latest a416a98b71e2 4 weeks ago 4.26MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver v1.24.1 e9f4b425f919 15 months ago 130MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler v1.24.1 18688a72645c 15 months ago 51MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy v1.24.1 beb86f5d8e6c 15 months ago 110MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager v1.24.1 b4ea7e648530 15 months ago 119MB
registry.cn-hangzhou.aliyuncs.com/google_containers/etcd 3.5.3-0 aebe758cef4c 16 months ago 299MB
registry.cn-hangzhou.aliyuncs.com/google_containers/pause 3.7 221177c6082a 17 months ago 711kB
registry.cn-hangzhou.aliyuncs.com/google_containers/coredns v1.8.6 a4ca41631cc7 22 months ago 46.8MB
k8s.gcr.io/pause 3.6 6270bb605e12 24 months ago 683kB
registry.cn-hangzhou.aliyuncs.com/google_containers/storage-provisioner v5 6e38f40d628d 2 years ago 31.5MB
org/kubernetes-leader-election-example eval $(minikube docker-env)Mac minikube 本地构建执行 SpringCloud-Kubernetes-Example
Mac 安装 minikube 此处不描述。 本文主要参照官方流程依据源码构建实践示例代码。
依赖版本说明
docker 20.10.20minikube v1.28.0k8s 1.24.1maven 3.6jdk17spring-cloud-kubernetes 3.1.0-SNAPSHOTspring-cloud-build 4.1.0-SNAPSHOT
以上maven和jdk是必要条件注意版本的对应
基础条件准备
安装maven3环境安装JDK17环境启动docker启动minikube minikube start
查看 minikube 访问的 docker 环境
minikube docker-env
:~$ minikube docker-env
export DOCKER_TLS_VERIFY1
export DOCKER_HOSTtcp://127.0.0.1:54965
export DOCKER_CERT_PATH~/.minikube/certs
export MINIKUBE_ACTIVE_DOCKERDminikube# To point your shell to minikubes docker-daemon, run:
# eval $(minikube -p minikube docker-env)如果本地docker没有habor等私仓环境,注意这行注释需要让当前shell去访问minikube的docker 需要执行 eval $(minikube -p minikube docker-env)。官方文档也很细心地写明了这个指令哦对于小白还是比较友好
指令执行后即可在当前这个shell直接docker images看到仓库中的镜像了
以下开始执行示例项目的部署
进入example项目文件夹下为项目创建role和role-binding
kubectl apply -f leader-role.ymlapiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:name: leaderlabels:app: kubernetes-leader-election-examplegroup: org.springframework.cloud
rules:
- apiGroups:- resources:- podsverbs:- watch- get
- apiGroups:- resources:- configmapsverbs:- watch- get- update# resourceNames:# - config-map name----kubectl apply -f leader-rolebinding.ymlapiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:labels:app: kubernetes-leader-election-examplegroup: org.springframework.cloudname: leader
roleRef:apiGroup: kind: Rolename: leader
subjects:
- kind: ServiceAccountname: defaultapiGroup: 在example目录下通过maven组件构建docker镜像
./mvnw spring-boot:build-image -Dspring-boot.build-image.imageNameorg/kubernetes-leader-election-example通过以下yaml构建服务
---
apiVersion: v1
kind: List
items:- apiVersion: v1kind: Servicemetadata:labels:app: kubernetes-leader-election-examplename: kubernetes-leader-election-examplespec:ports:- name: httpport: 80targetPort: 8080selector:app: kubernetes-leader-election-exampletype: ClusterIP- apiVersion: v1kind: ServiceAccountmetadata:labels:app: kubernetes-leader-election-examplename: kubernetes-leader-election-example- apiVersion: rbac.authorization.k8s.io/v1kind: RoleBindingmetadata:labels:app: kubernetes-leader-election-examplename: kubernetes-leader-election-example:viewroleRef:kind: RoleapiGroup: rbac.authorization.k8s.ioname: namespace-readersubjects:- kind: ServiceAccountname: kubernetes-leader-election-example- apiVersion: rbac.authorization.k8s.io/v1kind: Rolemetadata:namespace: defaultname: namespace-readerrules:- apiGroups: [, extensions, apps]resources: [configmaps, pods, services, endpoints, secrets]verbs: [get, list, watch]- apiVersion: apps/v1kind: Deploymentmetadata:name: kubernetes-leader-election-examplespec:selector:matchLabels:app: kubernetes-leader-election-exampletemplate:metadata:labels:app: kubernetes-leader-election-examplespec:serviceAccountName: kubernetes-leader-election-examplecontainers:- name: kubernetes-leader-election-exampleimage: org/kubernetes-leader-election-example:latestimagePullPolicy: IfNotPresentreadinessProbe:httpGet:port: 8080path: /actuator/health/readinesslivenessProbe:httpGet:port: 8080path: /actuator/health/livenessports:- containerPort: 8080
将内部服务的8080映射到ClusterIP的80上获取本机的代理地址端口未指定所以每次启动是随机的 :~$ minikube service kubernetes-leader-election-example --urlservice default/kubernetes-leader-election-example has no node port
http://127.0.0.1:57562
❗ Because you are using a Docker driver on darwin, the terminal needs to be open to run it.
访问地址 http://127.0.0.1:57562 就能获取响应由于只有一个节点所以这个节点就是主节点
curl http://127.0.0.1:57562
I am kubernetes-leader-election-example-5fbf89948f-gf8gd and I am the leader of the world增加实例数增加到2个
kubectl scale --replicas2 deployment.apps/kubernetes-leader-election-exampleNAMESPACE NAME READY STATUS RESTARTS AGE
default kubernetes-leader-election-example-5fbf89948f-427xs 1/1 Running 4 (25m ago) 3d21h
default kubernetes-leader-election-example-5fbf89948f-gf8gd 1/1 Running 4 (25m ago) 3d21h由于节点数增加两个服务也就开始存在负载均衡的效果依赖k8s调度此时请求目标地址 http://127.0.0.1:57562, 请求一般都是落在从节点上反复请求节点会交替但都是到从节点
I am kubernetes-leader-election-example-5fbf89948f-427xs but I am not a leader of the world
I am kubernetes-leader-election-example-5fbf89948f-gf8gd but I am not a leader of the world欢迎点这里免费关注我的GitHub给大家提供最真实的源码和技术分享
