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Istio

Neste repositório estarão disponíveis nosso Workshop de implementação fazendo uso da tecnologia Kubernetes, Minikube e Istio

Esse material é baseado nesse tutorial: Istio Tutorial

Pré Requisitos

Implementação

  1. Minikube Setup
  2. Deploy Customer Microservice
  3. Deploy Preference Microservice
  4. Deploy Recommendation Microservice
  5. Observability - Grafana
  6. Observability - Prometheus
  7. Observability - Jaeger
  8. Observability - Kiali
  9. Traffic Control
  10. Service Resiliency - Retry
  11. Service Resiliency - Timeout

Implementação

0 - Minikube Setup

  • Clone/Download do repositório: git clone https://github.com/redhat-developer-demos/istio-tutorial istio-tutorial

  • Inicie o minikube com os seguintes atributos: minikube start --memory=8192 --cpus=3 --kubernetes-version=v1.18.6 --vm-driver=virtualbox -p istio-devnation

  • Habilite o serviço do istio: istioctl manifest apply --set profile=demo --set values.global.proxy.privileged=true

  • Verifique os pods do Istio:

    kubectl config set-context $(kubectl config current-context) --namespace=istio-system

kubectl get pods -w      
NAME                                      READY   STATUS    RESTARTS   AGE
grafana-6b65874977-n76pc                  1/1     Running   1          155d
istio-citadel-7bcc69d486-6tkjk            1/1     Running   2          155d
istio-egressgateway-6b6f694c97-vmwsk      1/1     Running   1          155d
istio-galley-6cf8f58d7b-z888s             1/1     Running   1          155d
istio-ingressgateway-8c9c9c9f5-jmj2c      1/1     Running   1          155d
istio-pilot-c6dbc54b9-lw77b               1/1     Running   1          155d
istio-policy-66c4cf95c5-h9kpb             1/1     Running   5          155d
istio-sidecar-injector-79ccdf54c4-t7qxb   1/1     Running   1          155d
istio-telemetry-7bf96cb54f-qdm7t          1/1     Running   5          155d
istio-tracing-c66d67cd9-fcbcq             1/1     Running   2          155d
kiali-8559969566-znxgm                    1/1     Running   1          155d
prometheus-66c5887c86-7nnsv               1/1     Running   1          155d

1 - Deploy Customer Microservice

  • Garanta que voce está logado: kubectl config current-context

  • Crie o namespace Tutorial:

    kubectl create namespace tutorial
kubectl config set-context $(kubectl config current-context) --namespace=tutorial

  • Para facilitar a operação desse tutorial, crie uma variável de ambiente que referencie o local de checkout/clone do repositório:

    export TUTORIAL_HOME=$PWD
echo $TUTORIAL_HOME

  • Deployment do Customer Microservice

    kubectl apply -f <(istioctl kube-inject -f $TUTORIAL_HOME/customer/kubernetes/Deployment.yml) -n tutorial

serviceaccount/customer created
deployment.apps/customer configured

kubectl create -f $TUTORIAL_HOME/customer/kubernetes/Service.yml -n tutorial
service/customer created

kubectl create -f $TUTORIAL_HOME/customer/kubernetes/Gateway.yml -n tutorial
gateway.networking.istio.io/customer-gateway created
virtualservice.networking.istio.io/customer-gateway created

kubectl get svc istio-ingressgateway -n istio-system

export INGRESS_HOST=$(minikube ip -p istio-devnation)
export INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].nodePort}')

export GATEWAY_URL=$INGRESS_HOST:$INGRESS_PORT

  • Verifique se Customer Microservice foi implementado com sucesso:

    curl $GATEWAY_URL/customer


customer => UnknownHostException: preference

kubectl -n tutorial logs customer-5c4d9c784f-mplvx customer -f
Caused by: java.net.UnknownHostException: preference

2 - Deploy Preference Microservice

  • Deployment do Preference Microservice

    kubectl apply -f <(istioctl kube-inject -f $TUTORIAL_HOME/preference/kubernetes/Deployment.yml)  -n tutorial

serviceaccount/preference created
deployment.apps/preference-v1 created

kubectl create -f $TUTORIAL_HOME/preference/kubernetes/Service.yml -n tutorial
service/preference created

  • Verifique se Preference Microservice foi implementado com sucesso:

    curl $GATEWAY_URL/customer


customer => Error: 503 - preference => UnknownHostException: recommendation

kubectl -n tutorial logs -f preference-v1-bb965dfd8-w4n7t preference
Caused by: java.net.UnknownHostException: recommendation

3 - Deploy Recommendation Microservice

  • Deployment do Recommendation Microservice

    kubectl apply -f <(istioctl kube-inject -f $TUTORIAL_HOME/recommendation/kubernetes/Deployment.yml) -n tutorial

serviceaccount/recommendation created
deployment.apps/recommendation-v1 created

kubectl create -f $TUTORIAL_HOME/recommendation/kubernetes/Service.yml -n tutorial
service/recommendation created

  • Verifique se Recommendation Microservice foi implementado com sucesso:

    curl $GATEWAY_URL/customer

customer => preference => recommendation v1 from 'recommendation-v1-55675885b5-l65cx': 1

4 - Observability - Grafana

  • Realize alguns requests na API: sh $TUTORIAL_HOME/scripts/run.sh $GATEWAY_URL/customer

  • Acesse o serviço do Grafana: istioctl dashboard grafana

  • Visualize os dashboards disponíveis em: Home -> Istio

5 - Observability - Prometheus

  • Acesse o serviço do Prometheus: istioctl dashboard prometheus

  • Navegue por métricas do Istio

  • Crie métricas customizadas:

    kubectl create -f $TUTORIAL_HOME/istiofiles/recommendation_requestcount.yml -n istio-system

instance.config.istio.io/recommendationrequestcount created
handler.config.istio.io/recommendationrequestcounthandler created
rule.config.istio.io/recommendationrequestcountprom created

while true; do curl $GATEWAY_URL/customer; sleep .5;  done

  • Coloque a seguinte métrica na interface do Prometheus:

istio_requests_total{destination_service="recommendation.tutorial.svc.cluster.local"}
container_memory_rss{namespace="tutorial",container=~"customer|preference|recommendation"}

6 - Observability - Jaeger

  • Acesse o serviço do Jaeger: istioctl dashboard jaeger

7 - Observability - Kiali

  • Acesse o serviço do Kiali: istioctl dashboard kiali

    • as credenciais são: admin / admin

8 - Traffic Control

  • Deployment do Recommendation-v2 Microservice: kubectl apply -f <(istioctl kube-inject -f $TUTORIAL_HOME/recommendation/kubernetes/Deployment-v2.yml) -n tutorial

  • Abra uma novo terminal e execute o seguinte script que faz requests na API: while true; do curl $GATEWAY_URL/customer; sleep 1; done

  • Escale alguma das versões para um número de réplicas maior: kubectl scale --replicas=2 deployment/recommendation-v2 -n tutorial

  • Retome as configurações iniciais: kubectl scale --replicas=1 deployment/recommendation-v2 -n tutorial

  • Todos as requisições para Recommendation-v2 Microservice:

    kubectl create -f $TUTORIAL_HOME/istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial
kubectl create -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v2.yml -n tutorial

  • Todos as requisições para Recommendation-v1 Microservice:

    kubectl replace -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v1.yml -n tutorial
kubectl get virtualservice -n tutorial
kubectl get virtualservice -o yaml -n tutorial

  • Todas as requisições no modo padrão: kubectl delete -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v1.yml -n tutorial

  • 90%/10%: kubectl create -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v1_and_v2.yml -n tutorial

  • 75%/25%: kubectl replace -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v1_and_v2_75_25.yml -n tutorial

  • CleanUp: sh $TUTORIAL_HOME/scripts/clean.sh tutorial

  • Usuários Safari para Recommendation-v2 Microservice:

    -- todos para v1
kubectl create -f $TUTORIAL_HOME/istiofiles/destination-rule-recommendation-v1-v2.yml -n tutorial
kubectl create -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-v1.yml -n tutorial

-- criando regra para Safari
kubectl replace -f $TUTORIAL_HOME/istiofiles/virtual-service-safari-recommendation-v2.yml -n tutorial
kubectl get virtualservice -n tutorial
-- removendo regra Safari
kubectl delete -f $TUTORIAL_HOME/istiofiles/virtual-service-safari-recommendation-v2.yml -n tutorial

-- mobile para v2
kubectl create -f $TUTORIAL_HOME/istiofiles/virtual-service-mobile-recommendation-v2.yml -n tutorial
curl -A "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4(KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5" $GATEWAY_URL/customer

  • CleanUp: sh $TUTORIAL_HOME/scripts/clean.sh tutorial

9 - Service Resiliency - Retry

  • Faça todas requisições para Recommendation-v1 Microservice falharem:

    kubectl exec -it -n tutorial $(kubectl get pods -n tutorial|grep recommendation-v2|awk '{ print $1 }'|head -1) -c recommendation /bin/bash
curl localhost:8080/misbehave
curl localhost:8080/behave

10 - Service Resiliency - Timeout 

kubectl patch deployment recommendation-v2 -p '{"spec":{"template":{"spec":{"containers":[{"name":"recommendation", "image":"quay.io/rhdevelopers/istio-tutorial-recommendation:v2-timeout"}]}}}}' -n tutorial
kubectl create -f $TUTORIAL_HOME/istiofiles/virtual-service-recommendation-timeout.yml -n tutorial

kubectl patch deployment recommendation-v2 -p '{"spec":{"template":{"spec":{"containers":[{"name":"recommendation", "image":"quay.io/rhdevelopers/istio-tutorial-recommendation:v2"}]}}}}' -n tutorial
  • CleanUp: sh $TUTORIAL_HOME/scripts/clean.sh tutorial

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