This is a test post.
灰度发布的介绍
istio实现灰度发布的原理
具体实现步骤
发布第一版程序
第一版程序正常发布，注意deployment 的label包含app: demoapp和version: 1.0.0，，svc只包含app: demoapp即可。
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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: demoapp-1.0.0
namespace: deply-test
spec:
replicas: 1
selector:
matchLabels:
app: demoapp
template:
metadata:
labels:
app: demoapp
version: 1.0.0
spec:
containers:
- image: zouhl/demoapp:1.0.0
imagePullPolicy: Always
name: demoweb
ports:
- containerPort: 80
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: demoapp
namespace: deply-test
labels:
app: demoapp
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: demoapp
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然后使用kuberctl检查部署结果，再部署istio相关的yaml
部署istio相关yaml
1.部署DestinationRule
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apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: demoapp
namespace: deply-test
spec:
host: demoapp
trafficPolicy:
loadBalancer:
simple: RANDOM
subsets:
- name: v1
labels:
version: 1.0.0
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2.部署gateway + virtualservice
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apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: demoapp-gateway
namespace: deply-test
spec:
selector:
istio: ingressgateway # use istio default controller
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "*"
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: demoapp
namespace: deply-test
spec:
hosts:
- "*"
gateways:
- demoapp-gateway
http:
- match:
- uri:
prefix: /demoapp/
route:
- destination:
host: demoapp
port:
number: 80
subset: v1
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到目前为止，所有的请求都会路由到demeapp的v1版本。
灰度发布demoapp
现在开始升级demoapp，实现灰度发布。
1.部署第二版demoapp的deployment
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apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: demoapp-2.0.0
namespace: deply-test
spec:
replicas: 1
selector:
matchLabels:
app: demoapp
template:
metadata:
labels:
app: demoapp
version: 2.0.0
spec:
containers:
- image: zouhl/demoapp:2.0.0
imagePullPolicy: IfNotPresent
name: demoweb
ports:
- containerPort: 80
protocol: TCP
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部署好过后，istio的流量不会路由到2.0.0的版本。
2.更新或部署istio的destination，添加v2版本
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apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: demoapp
namespace: deply-test
spec:
host: demoapp
trafficPolicy:
loadBalancer:
simple: RANDOM
subsets:
- name: v1
labels:
version: 1.0.0
- name: v2
labels:
version: 2.0.0
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3.更新或部署istio的VirtualService，将20%的流量转发到v2
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apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: demoapp
namespace: deply-test
spec:
hosts:
- "*"
gateways:
- demoapp-gateway
http:
- match:
- uri:
prefix: /demoapp/
route:
- destination:
host: demoapp
port:
number: 80
subset: v1
weight: 80
- destination:
host: demoapp
port:
number: 80
subset: v2
weight: 20
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4.第三步也可以使用下面的yaml，通过对headers的匹配进行分流，cookie中有user=jason的用户，90%会转发的v2版的程序，其余的用户只会转发到v1版本。
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apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: demoapp
namespace: deply-test
spec:
hosts:
- "*"
gateways:
- demoapp-gateway
http:
- match:
- uri:
prefix: /demoapp/
headers:
cookie:
regex: "^(.*?)?(user=jason)(;.*)?$"
route:
- destination:
host: demoapp
port:
number: 80
subset: v1
weight: 10
- destination:
host: demoapp
port:
number: 80
subset: v2
weight: 90
- match:
- uri:
prefix: /demoapp/
route:
- destination:
host: demoapp
subset: v1
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