给命名空间添加标签,指示 Istio 在部署应用的时候,自动注入 Envoy 边车代理
[root@k8s2 istio-1.19.3]# kubectl label namespace default istio-injection=enabled
访问kiali:http://192.168.56.100:20001/
将所有流量路由到每个微服务的 v1 版本
- [root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/destination-rule-all.yaml
- [root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-all-v1.yaml
来自名为 Jason 的用户的所有流量将被路由到服务 reviews:v2
[root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-reviews-test-v2.yaml
创建故障注入规则以延迟来自测试用户 jason 的流量
kubectl apply -f samples/bookinfo/networking/virtual-service-ratings-test-delay.yaml
用户 jason 登陆到 /productpage 页面,出现了一个问题:Reviews 部分显示了错误消息
设置流量转移,将所有流量转移到 reviews:v3
- [root@k8s2 istio-1.19.3]# vim samples/bookinfo/networking/virtual-service-reviews-test-v2.yaml
- apiVersion: networking.istio.io/v1alpha3
- kind: VirtualService
- metadata:
- name: reviews
- spec:
- hosts:
- - reviews
- http:
- - match:
- - headers:
- end-user:
- exact: jason
- route:
- - destination:
- host: reviews
- subset: v3
- - route:
- - destination:
- host: reviews
- subset: v1
- [root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-reviews-test-v2.yaml
修改延迟规则为任何低于 2.5 秒的数值,例如 2 秒
- [root@k8s2 istio-1.19.3]# vim samples/bookinfo/networking/virtual-service-ratings-test-delay.yaml
- apiVersion: networking.istio.io/v1alpha3
- kind: VirtualService
- metadata:
- name: ratings
- spec:
- hosts:
- - ratings
- http:
- - match:
- - headers:
- end-user:
- exact: jason
- fault:
- delay:
- percentage:
- value: 100.0
- fixedDelay: 2s
- route:
- - destination:
- host: ratings
- subset: v1
- - route:
- - destination:
- host: ratings
- subset: v1
- [root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-ratings-test-delay.yaml
把 50% 的流量从 reviews:v1 转移到 reviews:v3
[root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-reviews-50-v3.yaml
当reviews:v3 微服务已经稳定,可以通过应用 Virtual Service 规则将 100% 的流量路由 reviews:v3:
[root@k8s2 istio-1.19.3]# kubectl apply -f samples/bookinfo/networking/virtual-service-reviews-v3.yaml
清理
[root@k8s2 istio-1.19.3]# samples/bookinfo/platform/kube/cleanup.sh
部署 httpbin 服务
[root@k8s2 istio-1.19.3]# kubectl apply -f samples/httpbin/httpbin.yaml
配置熔断规则
- [root@k8s2 istio-1.19.3]# kubectl apply -f - <<EOF
- apiVersion: networking.istio.io/v1alpha3
- kind: DestinationRule
- metadata:
- name: httpbin
- spec:
- host: httpbin
- trafficPolicy:
- connectionPool:
- tcp:
- maxConnections: 1
- http:
- http1MaxPendingRequests: 1
- maxRequestsPerConnection: 1
- outlierDetection:
- consecutive5xxErrors: 1
- interval: 1s
- baseEjectionTime: 3m
- maxEjectionPercent: 100
- EOF
增加一个客户端
[root@k8s2 istio-1.19.3]# kubectl apply -f samples/httpbin/sample-client/fortio-deploy.yaml
登入客户端 Pod 并使用 Fortio 工具调用 httpbin 服务
- [root@k8s2 istio-1.19.3]# export FORTIO_POD=$(kubectl get pods -l app=fortio -o 'jsonpath={.items[0].metadata.name}')
- [root@k8s2 istio-1.19.3]# kubectl exec "$FORTIO_POD" -c fortio -- /usr/bin/fortio curl -quiet http://httpbin:8000/get
触发熔断器
发送并发数为 2 的连接(-c 2),请求 20 次(-n 20)
[root@k8s2 istio-1.19.3]# kubectl exec "$FORTIO_POD" -c fortio -- /usr/bin/fortio load -c 2 -qps 0 -n 20 -loglevel Warning http://httpbin:8000/get
istio-proxy 确实允许存在一些误差
将并发连接数提高到 3 个
[root@k8s2 istio-1.19.3]# kubectl exec "$FORTIO_POD" -c fortio -- /usr/bin/fortio load -c 3 -qps 0 -n 30 -loglevel Warning http://httpbin:8000/get
均被熔断器拦截
清理
- kubectl delete destinationrule httpbin
- kubectl delete -f samples/httpbin/sample-client/fortio-deploy.yaml
- kubectl delete -f samples/httpbin/httpbin.yaml
卸载istio
- istioctl uninstall -y --purge
- kubectl label namespace default istio-injection-