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
-
关闭防火墙
systemctl disable firewalld
systemctl stop firewalld
-
安装etcd和Kubernetes软件（会自动安装Docker软件）
yum install -y etcd kubernetes
-
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
-
MySQL镜像
docker pull daocloud.io/library/mysql:latest
-
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"
-
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
-
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
- 拉取Tomcat镜像
docker pull kubeguide/tomcat-app:v2
- 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
- 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
