Cloud native application comprehensive exercise

In the last blog, I talked about the front 4 Three scenes were practiced , This blog will focus on the following 5 Practice in scenes . The specific scenario information is as follows , The application still uses istio Official website bookinfo application .

  6、 ... and ： Through the open Kiali, utilize Promethues Collect service invocation relationship information

6.1： install Promethues, Only here Istio Official website Under the yaml File to install ,yaml The file directory is (samples/addons/promethues.yaml)

 6.2: Turn on Kiali plug-in unit , So that you can get through Kiali The plug-in collects the call relationship information between services .Kiali Of yaml The file in Istio Official website Of Sample Under the table of contents （samples/addons/kiali.yaml）.

6.3： take Kiali Of svc Modified into NodePort type , In this way, you can access on the Internet kiali service .

6.4: visit Kiali, Can be in Graph menu Next , notice bookinfo The calling relationship between micro Services .

7、 ... and ： To achieve gray Publishing

7.1: see bookInfo application , You can find review The service has 3 A version .

7.2 adopt destination Different definitions subset,yaml The file address is istio This directory of the official website

(samples/bookinfo/networking/destination-rule-all.yaml)

  Then define VirtualService To control the flow , There are two yaml file , these two items. yaml The file is also in the above directory .

virtual-service-all-v1.yaml： Import all traffic V1 Version of reviews service ,V1 Version of reviews The icon of stars cannot be displayed .

virtual-service-reviews-test-v2.yaml： If the logged in user is JASON, Then import the flow to V2 On the version , and review Of V2 The version can display stars . It's a bit like , for example V2 Is the new version , For early adopters , You can put V2 The new features of the version allow early adopters to use , Collect feedback .v2 Of virtualservice The rules are as follows ：

7.3: After the rules take effect , visit productpage, You can see if you use jason Sign in , Then the stars are displayed , Explain the visit is V2.

  8、 ... and ： fault injection , By injecting some faults, we can check whether there are technical hidden debts in the application .

Istio Support through configuration VertualService To inject some faults such as delay , To check whether the service has reasonable fault tolerance . Actually, there are special tools for fault injection , for example chaosmesh,chaoslade, In the follow-up blog, we will introduce the use of various fault injection tools in the chaos engineering column , So here is only a brief introduction .

8.1: For example, here the injection returns 555 code Of 100% Street level fault error .

8.2: For example, inject 100% Delay of 7s Fault error of .

Nine ： stay VirtualService Configure timeout in 、 Circuit breakers, etc

9.1: visit reviews This service , If the response time exceeds 0.5s, The timeout error is returned

 9.2: Small example of circuit breaker rule configuration

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: ratings
spec:
  host: ratings
  subsets:
  - labels:
      version: v1
    name: v1
  - labels:
      version: v2
    name: v2
  - labels:
      version: v2-mysql
    name: v2-mysql
  - labels:
      version: v2-mysql-vm
    name: v2-mysql-vm
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 1
      http:
        http1MaxPendingRequests: 1
        maxRequestsPerConnection: 1
    outlierDetection:
      consecutive5xxErrors: 1
      interval: 1s
      baseEjectionTime: 3m
      maxEjectionPercent: 100
EOF