K8s权威指南学习

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K8s权威指南学习

店家小二 2018-12-13 20:37:00 浏览1514
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第一章 k8s入门(简单的Java web项目) 

环境: VMware Workstation在本机虚拟一个64位的Centos7虚拟机

环境准备

  1. 关闭防火墙

    systemctl disable firewalld
    systemctl stop firewalld
    
  2. 安装etcd和Kubernetes软件(会自动安装Docker软件)

    yum install -y etcd kubernetes
    
  3. 按顺序启动所有服务

    systemctl start etcd
    systemctl start docker
    systemctl start kube-apiserver
    systemctl start kube-controller-manager
    systemctl start kube-scheduler
    systemctl start kubelet
    systemctl start kube-proxy

启动MySQL服务

  1. MySQL镜像

    docker pull daocloud.io/library/mysql:latest
    
  2. 构建Mysql RC定义文件(可以使用vim创建),命名mysql-rc.yaml 内容如下:

    apiVersion: v1
    kind: ReplicationController
    metadata:
     name: mysql
    	spec:
    	 replicas: 1
    	 selector:
    		app: mysql
    	 template:
    		metadata:
    		 labels:
    			app: mysql
    		spec:
    		 containers:
    		 - name: mysql
    			image: mysql
    			ports:
    			- containerPort: 3306
    			env:
    			- name: MYSQL_ROOT_PASSWORD
    			 value: "123456" 
  3. 发布到kubernetes集群中,在master节点执行命令(注:此时可能出现问题,如:问题1:no resource found,问题2:status的状态是ContainerCreating而不是running,如果出现此问题请看关于创建rc和pod出现的问问题

    $ kubectl create -f mysql-rc.yaml 
    replicationcontroller "mysql" created
    

    查看创建的rc

    $ kubectl get rc 
    NAME DESIRED CURRENT READY AGE 
    mysql 1 1 1 14s
    

    查看pod创建情况

    $ kubectl get pods 
    NAME READY STATUS RESTARTS AGE 
    mysql-srd1m 1/1 Running 0 41s
    
  4. 创建一个与之关联的k8s Service-Mysql的定义文件(文件名为mysql-svc.yaml),内容如下:

    apiVersion: v1
    kind: Service
    metadata:
    name: mysql
    spec:
    ports:
    - port: 3306
    selector:
    app: mysql
    

    运行kubectl命令,创建service

    kubectl create -f mysql-svc.yaml
    

    查看刚刚创建的service

    $ kubectl get svc
    NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
    kubernetes 10.254.0.1 <none> 443/TCP 8d
    mysql 10.254.55.41 <none> 3306/TCP 13s

启动Tomcat服务

  1. 拉取Tomcat镜像
    	docker pull kubeguide/tomcat-app:v2
    
  2. 构建Tomcat RC定义文件,命名myweb-rc.yaml 内容如下:
    		apiVersion: v1
    		kind: ReplicationController
    		metadata:
    		 name: myweb
    		spec:
    		 replicas: 2
    		 selector:
    			app: myweb
    		 template:
    			metadata:
    			 labels:
    				app: myweb
    			spec:
    			 containers:
    				- name: myweb
    				 image: kubeguide/tomcat-app:v1
    				 ports:
    				 - containerPort: 8080 
    完成rc创建和验证
    	$ kubectl create -f myweb-rc.yaml 
    	replicationcontroller "myweb" created
    	$ kubectl get rc 
    	NAME DESIRED CURRENT READY AGE
    	mysql 1 1 1 23h
    	myweb 2 2 2 12s
    	$ kubectl get pods
    	NAME READY STATUS RESTARTS AGE
    	mysql-srd1m 1/1 Running 1 23h
    	myweb-fqlvz 1/1 Running 0 40s
    	myweb-ggrlg 1/1 Running 0 40s
    
  3. 创建对应的Service,文件名(myweb-svc.yaml),内容如下
    	apiVersion: v1
    	kind: Service
    	metadata: 
    	name: myweb
    	spec:
    	type: NodePort
    	ports:
    	- port: 8080
    	nodePort: 30001
    	selector:
    	app: myweb
    
    创建并验证
    	$ kubectl create -f myweb-svc.yaml 
    	service "myweb" created
    	$ kubectl get services
    	NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
    	kubernetes 10.254.0.1 <none> 443/TCP 8d
    	mysql 10.254.55.41 <none> 3306/TCP 42m
    	myweb 10.254.237.187 <nodes> 8080:30001/TCP 21s

本文转移开源中国-K8s权威指南学习

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