k8s google sample - guestbook

Redis读写分离作为存储

PHP网页作为前端

github地址

https://github.com/kubernetes/kubernetes/blob/release-1.1/examples/guestbook/README.md

Create guest book sample on k8s

1. 创建Redis写端RC yaml

apiVersion: v1
kind: ReplicationController
metadata:
name: redis-master
labels:
name: redis-master
spec:
replicas: 1
selector:
name: redis-master
template:
metadata:
labels:
name: redis-master
spec:
containers:
- name: master
image: redis
ports:
- containerPort: 6379

可以到开头的github地址下载dockfile，自己创建image

2. k8s创建RC redis master

kubectl create -f redis-master-controller.yaml

3. k8s创建 redis master service yaml

apiVersion: v1

kind: Service

metadata:

name: redis-master

labels:

name: redis-master

spec:

ports:

# the port that this service should serve on

- port: 6379

targetPort: 6379

selector:

name: redis-master

4. k8s创建SVC

kubectl create -f redis-master-service.yaml

5. 创建Redis读端 RC redis slave yaml

apiVersion: v1

kind: ReplicationController

metadata:

name: redis-slave

labels:

name: redis-slave

spec:

replicas: 2

selector:

name: redis-slave

template:

metadata:

labels:

name: redis-slave

spec:

containers:

- name: slave

image: kubeguide/guestbook-redis-slave

env:

- name: GET_HOSTS_FROM

value: env

# If your cluster config does not include a dns service, then to

# instead access an environment variable to find the master

# service's host, comment out the 'value: dns' line above, and

# uncomment the line below.

#value: env

ports:

- containerPort: 6379

示例文档中说明如果放在云端并且有DNS服务器可以写入dns，但是实验中是在局域网内，所以使用env

6. k8s创建redis slave RC

kubectl create -f redis-slave-controller.yaml

7. 创建redis slave svc yaml

apiVersion: v1

kind: Service

metadata:

name: redis-slave

labels:

name: redis-slave

spec:

ports:

# the port that this service should serve on

- port: 6379

selector:

name: redis-slave

8. k8s创建redis slave svc

kubectl create -f redis-slave-service.yaml

9. 创建php frontend rc yaml

apiVersion: v1

kind: ReplicationController

metadata:

name: frontend

labels:

name: frontend

spec:

replicas: 3

selector:

name: frontend

template:

metadata:

labels:

name: frontend

spec:

containers:

- name: frontend

image: peter/php-frontend:v1

env:

- name: GET_HOSTS_FROM

value: env

# If your cluster config does not include a dns service, then to

# instead access environment variables to find service host

# info, comment out the 'value: dns' line above, and uncomment the

# line below.

# value: env

ports:

- containerPort: 80

这是下载了github的dockfile，本地构建的镜像



10. k8s创建 php frontend rc

kubectl create -f frontend-controller.yaml

11. 创建php frontend svc yaml

apiVersion: v1

kind: Service

metadata:

name: frontend

labels:

name: frontend

spec:

# if your cluster supports it, uncomment the following to automatically create

# an external load-balanced IP for the frontend service.

type: NodePort

ports:

# the port that this service should serve on

- port: 80

nodePort: 30001

selector:

name: frontend

打开节点机器30001端口

12. k8s创建php frontend svc

kubectl create -f frontend-service.yaml

查看k8s的pods svc rc



输入node机器的ip:30001即可访问



Scale

k8s执行命令

kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers redis-slave





Rolling update

k8s执行命令

kubectl rolling-update frontend --image=peter/php-frontend:v3