一、声明：
用到的k8s资源：
1.pod
2.confgMap

二、拉取kodcloud、mySql镜像
sudo docker pull kodcloud/kodbox
sudo docker pull mysql:8
参考连接：

    https://hub.docker.com/r/kodcloud/kodbox
    https://hub.docker.com/_/mysql

三、编写yaml文件
cat 04-pod-rc-kodcloud.yaml

apiVersion: v1
##pod资源##
kind: Pod
metadata:
  name: kodcloud
spec：
##调度到某个节点##
  nodeName: worker233
##直接使用宿主机网卡##
  hostNetwork: true
  containers:
  - name: kodcloud
##在自己的私有仓库中拉取镜像##
    image: ......../kodcloud:latest
##基于环境变量引入cm资源##
env:

##数据库的地址##
- name: MYSQL_SERVER
  valueFrom:
    fieldRef:
      fieldPath: status.hostIP

##数据库的用户##     
- name: MYSQL_USER
  valueFrom:
    configMapKeyRef:
      name: kodcloud-cm
      key: user

##数据库的密码##
- name: MYSQL_PASSWORD
  valueFrom:
    configMapKeyRef:
      name: kodcloud-cm
      key: passwd

##数据库的名称
- name: MYSQL_DATABASE
  valueFrom:
    configMapKeyRef:
      name: kodcloud-cm
      key: database

stdin: true


 - name: mysql-kodcloud
##在自己的私有仓库中拉取镜像##
    image: .......mysql:8
    env:
    - name: MYSQL_DATABASE
      value: "kodcloud"
    - name: MYSQL_ALLOW_EMPTY_PASSWORD
      value: "yes"
    - name: MYSQL_USER
      value: "admin"
    - name: MYSQL_PASSWORD
      value: "1"
    args:
    - --default_authentication_plugin=mysql_native_password
    - --character-set-server=utf8mb4
    - --collation-server=utf8mb4_unicode_ci
   
---
##定义cm资源##
apiVersion: v1
kind: ConfigMap
metadata:
  name: kodcloud-cm
data:
  database: kodcloud
  
  user: admin

  passwd: "1"

四、开始启动容器
[root@master231 homework]#sudo kubectl apply -f 04-pod-rc-kodcloud.yaml
pod/kodcloud created
configmap/kodcloud-cm created

五、查看是否成功运行

[root@master231 homework]#sudo kubectl get po,cm -owide
NAME                     READY   STATUS    RESTARTS   AGE   IP           NODE        NOMINATED NODE   READINESS GATES
pod/kodcloud   2/2     Running   0          80s   10.0.0.233   worker233   <none>           <none>

NAME                         DATA   AGE
configmap/kodcloud-cm        3      80s
configmap/kube-root-ca.crt   1      50m

六、浏览器访问测试是否部署成功，能否直接登录
http://10.0.0.233/

七、如果出现这样的页面就成功部署kodcloud到k8s了