基于kubernetes service实现金丝雀，蓝绿发布

服务匹配部署是在template下的labels,选择一个labels即可，一个服务可以对应多个部署，部署的副本越多分的流量比例越大哦，以此来实现金丝雀发布，同理也可以做蓝绿部署，就是在部署的template labels上交换添加移除标签的事

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
labels:
run: old-nginx
name: old-nginx
spec:
replicas: 1
selector:
matchLabels:
run: old-nginx
template:
metadata:
labels:
run: old-nginx
app: nginx
spec:
containers:
- image: registry.cn-hangzhou.aliyuncs.com/xianlu/old-nginx
imagePullPolicy: Always
name: old-nginx
ports:
- containerPort: 80
protocol: TCP
restartPolicy: Always

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
labels:
run: new-nginx
name: new-nginx
spec:
replicas: 1
selector:
matchLabels:
run: new-nginx
template:
metadata:
labels:
run: new-nginx
app: nginx
spec:
containers:
- image: registry.cn-hangzhou.aliyuncs.com/xianlu/new-nginx
imagePullPolicy: Always
name: new-nginx
ports:
- containerPort: 80
protocol: TCP
restartPolicy: Always

apiVersion: v1
kind: Service
metadata:
labels:
run: nginx
name: nginx
spec:
ports:

• port: 80
  protocol: TCP
  targetPort: 80
  selector:
  app: nginx
  sessionAffinity: None