$ kubectl create namespace bookinfo
# istio 源码包中携带此实例
$ kubectl -n bookinfo create -f /opt/istio/samples/bookinfo/platform/kube/bookinfo.yaml 
$ kubectl -n bookinfo get pods 
NAME                                  READY   STATUS    RESTARTS   AGE
details-v1-5974b67c8-wclnd            1/1     Running   0          34s
productpage-v1-64794f5db4-jsdbg       1/1     Running   0          33s
ratings-v1-c6cdf8d98-jrfrn            1/1     Running   0          33s
reviews-v1-7f6558b974-kq6kj           1/1     Running   0          33s
reviews-v2-6cb6ccd848-qdg2k           1/1     Running   0          34s
reviews-v3-cc56b578-kppcx             1/1     Running   0          34s

cat > ingress-productpage.yaml <<EOF
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: productpage
  namespace: bookinfo
spec:
  rules:
  - host: bookinfo.od.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service: 
            name: productpage
            port:
              number: 9080
EOF

kubectl apply -f  destination-rule-reviews.yaml
kubectl apply -f virtual-service-reviews-v3.yaml

# 访问productpage测试，此时发现页面一直停在v3版本不会变化，需求实现。

# 同样的方式，刚才已经定义过v1、v2、v3的去向了，现在只需要增加v1和v2路由规则即可
$ cat > virtual-service-reviews-90-10.yaml <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
  namespace: bookinfo
spec:
  hosts:
    - reviews
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
      weight: 90
    - destination:
        host: reviews
        subset: v2
      weight: 10
EOF

$ kubectl apply -f virtual-service-reviews-90-10.yaml
# 此时，再次访问，v3就不会出现了

$ curl http://book.istio.com/ratings/1        
{"id":1,"ratings":{"Reviewer1":5,"Reviewer2":4}}
$ curl http://book.istio.com/reviews/1
{"id": "1","podname": "reviews-v3-6dc9897554-8g9v2","clustername": "null","reviews": [{  "reviewer": "Reviewer1",  "text": "An extremely entertaining play by Shakespeare. The slapstick humour is refreshing!", "rating": {"stars": 5, "color": "red"}},{  "reviewer": "Reviewer2",  "text": "Absolutely fun and entertaining. The play lacks thematic depth when compared to other plays by Shakespeare.", "rating": {"stars": 4, "color": "red"}}]}

$ cat > virtual-service-reviews-header.yaml <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews
  namespace: bookinfo
spec:
  hosts:
  - reviews
  http:
  - match:
    - headers:
        end-user:
          exact: wangxiansen
    route:
    - destination:
        host: reviews
        subset: v3
  - route:
    - destination:
        host: reviews
        subset: v2
EOF

$ kubectl apply -f virtual-service-reviews-header.yaml

# https://github.com/nocalhost/bookinfo-productpage/blob/main/productpage.py
# 刷新观察http://book.istio.com.com/productpage

# 为httpbin-v1添加mirror设置，mirror点为httpbin-v2
$ kubectl -n bookinfo edit vs bookinfo
...
  - match:
    - uri:
        prefix: /httpbin
    name: httpbin-route
    rewrite:
      uri: /
    route:
    - destination:
        host: httpbin
        subset: v1
    mirror:
      host: httpbin
      subset: v2
    mirror_percent: 100
...

# 此时查看httpbin-v1的日志，显示一条状态码为502的日志
$ kubectl -n bookinfo logs -f httpbin-v1-5967569c54-sp874 -c istio-proxy
[2023-03-01T05:16:41.929Z] "GET /httpbin/status/502 HTTP/1.1" 502 - via_upstream - "-" 0 0 1 1 "10.1.1.1,172.7.100.1" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36" "fa5bee29-d86b-9022-87b5-d635dfd6c005" "book.istio.com" "172.7.100.7:80" inbound|80|| 127.0.0.6:40871 172.7.100.7:80 172.7.100.1:0 outbound_.8000_.v1_.httpbin.bookinfo.svc.cluster.local default

$ kubectl -n bookinfo edit vs bookinfo
...
  - match:
    - uri:
        prefix: /httpbin
    mirror:
      host: httpbin
      subset: v2
    mirror_percent: 100
    name: httpbin-route
    retries:
      attempts: 3
      perTryTimeout: 2s
      retryOn: 5xx
    rewrite:
      uri: /
    route:
    - destination:
        host: httpbin
        subset: v1
...

# 再次查看httpbin-v1的日志，显示四条状态码为502的日志

deployment yaml 内容如下：
 
# cat > httpbin-client-deploy.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpbin-client-v1
  namespace: bookinfo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: httpbin-client-v1
      version: v1
  template:
    metadata:
      labels:
        app: httpbin-client-v1
        version: v1
    spec:
      containers:
      - image: ceposta/http-envoy-client-standalone:latest
        imagePullPolicy: IfNotPresent
        name: httpbin-client
        command: ["/bin/sleep","infinity"]
EOF

$ kubectl apply -f <(istioctl kube-inject -f httpbin-client-deploy.yaml)

$ CLIENT_POD=$(kubectl get pod -n bookinfo | grep httpbin-client | awk '{ print $1 }')
$ kubectl -n bookinfo exec -it $CLIENT_POD -c httpbin-client -- sh -c 'export URL_UNDER_TEST=http://httpbin:8000/get export NUM_THREADS=1 && java -jar http-client.jar'

$ kubectl -n bookinfo exec -it $CLIENT_POD -c httpbin-client -- sh -c 'export URL_UNDER_TEST=http://httpbin:8000/get export NUM_THREADS=2 && java -jar http-client.jar'

$ kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpbin
  namespace: bookinfo
spec:
  host: httpbin
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 1
      http:
        http1MaxPendingRequests: 1
        maxRequestsPerConnection: 1
EOF

$ istioctl pc cluster httpbin-client-v1-56b86fb85c-vg5pp.bookinfo --fqdn httpbin.bookinfo.svc.cluster.local -ojson
...
        "connectTimeout": "10s",
        "maxRequestsPerConnection": 1,
        "circuitBreakers": {
            "thresholds": [
                {
                    "maxConnections": 1,
                    "maxPendingRequests": 1,
                    "maxRequests": 4294967295,
                    "maxRetries": 4294967295
                }
            ]
        },
...