linux12企业实战 -- 10流量策略
Posted FikL-09-19
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一、DestinationRule（目标规则）
DestinationRule定义了在发生路由后应用于服务流量的策略。这些规则指定负载均衡的配置，sidecar的连接池大小以及离线集群检测设置，通过健康检查，可以移除负载均衡池中的不健康的主机。
二、改变流量策略
1、创建两个服务
kind: Deployment
apiVersion: apps/v1
metadata:
name: nginx-web
labels:
app: nginx
deploy: nginx
server: web
spec:
selector:
matchLabels:
app: nginx
deploy: nginx
server: web
template:
metadata:
labels:
app: nginx
deploy: nginx
server: web
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-web-svc
labels:
app: nginx-web-svc
deploy: nginx-web-svc
spec:
ports:
- port: 80
targetPort: 80
name: nginx
protocol: TCP
selector:
server: web
---
kind: Deployment
apiVersion: apps/v1
metadata:
name: httpd-web
labels:
app: httpd
deploy: httpd
server: web
spec:
selector:
matchLabels:
app: httpd
deploy: httpd
server: web
template:
metadata:
labels:
app: httpd
deploy: httpd
server: web
spec:
containers:
- name: httpd
imagePullPolicy: IfNotPresent
image: httpd
ports:
- containerPort: 80
2、创建Gateway
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: web-gateway
spec:
selector:
istio: ingressgateway
servers:
- port:
number: 80
name: httpd
protocol: HTTP
hosts:
- "svc.test.com"
- port:
number: 80
name: nginx
protocol: HTTP
hosts:
- "svc.test.com"
3、创建DestinationRule
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: web
spec:
host: nginx-web-svc
subsets:
- name: httpd
labels:
app: httpd
- name: nginx
labels:
app: nginx
4、创建VirtualService
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: web
spec:
hosts:
- "svc.test.com"
gateways:
- web-gateway
http:
- route:
- destination:
host: nginx-web-svc
subset: nginx
weight: 80
- destination:
host: nginx-web-svc
subset: httpd
weight: 20
5、测试
# 通过下方测试，我们可以看到同一个服务，明显改变了流量轮询规则
[root@kubernetes-master-01 ~]# kubectl exec -it test -- sh
Defaulting container name to test.
Use 'kubectl describe pod/test -n default' to see all of the containers in this pod.
/ # while true; do wget -q -O- http://svc.test.com:3
2623;sleep 1;done
2623;sleep 1;done
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<h1>It is Nginx!</h1>
<html><body><h1>It works!</h1></body></html>
<h1>It is Nginx!</h1>
<html><body><h1>It works!</h1></body></html>
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