5个 Istio 访问外部服务流量控制最常用的例子，你知道几个？

kubectl apply -f samples/sleep/sleep.yaml

> curl -s http://192.168.1.118/
This is the v1 version of duckling.
> curl -s http://192.168.1.119/
This is the v2 version of duckling.

export SLEEP_POD=$(kubectl get pods -l app=sleep -o 'jsonpath={.items[0].metadata.name}')
kubectl exec "$SLEEP_POD" -c sleep -- curl -s http://httpbin.org/headers

{
  "headers": {
    "Accept": "*/*", 
    "Host": "httpbin.org", 
    "User-Agent": "curl/7.81.0-DEV", 
    "X-Amzn-Trace-Id": "Root=1-62bbfa10-3237e3b9662c65ae005148ab", 
    "X-B3-Sampled": "0", 
    "X-B3-Spanid": "9e650093bf7ae862", 
    "X-B3-Traceid": "1da46d7fafa5d71c9e650093bf7ae862", 
    "X-Envoy-Attempt-Count": "1", 
    "X-Envoy-Peer-Metadata": "......", 
    "X-Envoy-Peer-Metadata-Id": "sidecar~......"
  }
}

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: httpbin-ext
spec:
  hosts:
  - httpbin.org
  ports:
  - number: 80
    name: http
    protocol: HTTP
  resolution: DNS
  location: MESH_EXTERNAL
EOF

{
  "headers": {
    "Accept": "*/*", 
    "Host": "httpbin.org", 
    "User-Agent": "curl/7.81.0-DEV", 
    "X-Amzn-Trace-Id": "Root=1-62bbfbd6-254b05344b3cde2c0c41b3b8", 
    "X-B3-Sampled": "0", 
    "X-B3-Spanid": "307c0b106c8b262e", 
    "X-B3-Traceid": "f684a50776c088ac307c0b106c8b262e", 
    "X-Envoy-Attempt-Count": "1", 
    "X-Envoy-Decorator-Operation": "httpbin.org:80/*", 
    "X-Envoy-Peer-Metadata": "......", 
    "X-Envoy-Peer-Metadata-Id": "sidecar~......"
  }
}

export SLEEP_POD=$(kubectl get pods -l app=sleep -o 'jsonpath={.items[0].metadata.name}')
kubectl exec "$SLEEP_POD" -c sleep -- time curl -o /dev/null -sS -w "%{http_code}\n" http://httpbin.org/delay/5

200
real    0m 5.69s
user    0m 0.00s
sys     0m 0.00s

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin-ext
spec:
  hosts:
    - httpbin.org
  http:
  - timeout: 3s
    route:
      - destination:
          host: httpbin.org
        weight: 100
EOF

504
real    0m 3.01s
user    0m 0.00s
sys     0m 0.00s

export SLEEP_POD=$(kubectl get pods  -l app=sleep -o 'jsonpath={.items[0].metadata.name}')
kubectl exec "$SLEEP_POD" -c sleep -- time curl -o /dev/null -sS -w "%{http_code}\n" http://httpbin.org/get

200
real  0m 0.45s
user  0m 0.00s
sys 0m 0.00s

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin-ext
spec:
  hosts:
    - httpbin.org
  http:
    - fault:
        delay:
          fixedDelay: 3s
          percentage:
            value: 100
      route:
        - destination:
            host: httpbin.org
EOF

200
real  0m 3.43s
user  0m 0.00s
sys 0m 0.00s

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  ports:
  - number: 80
    name: http
    protocol: HTTP
  location: MESH_EXTERNAL
  resolution: STATIC
  endpoints:
  - address: 172.24.29.118
    ports:
      http: 80
    labels:
      version: v1
  - address: 172.24.29.119
    ports:
      http: 80
    labels:
      version: v2
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  http:
  - route:
    - destination:
        host: duckling.com
        subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: duckling
spec:
  host: duckling.com
  subsets:
    - labels:
        version: v1
      name: v1
    - labels:
        version: v2
      name: v2
EOF

export SLEEP_POD=$(kubectl get pods -l app=sleep -o 'jsonpath={.items[0].metadata.name}')
kubectl exec "$SLEEP_POD" -c sleep -- curl -s http://duckling.com/

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  http:
  - route:
    - destination:
        host: duckling.com
        subset: v1
      weight: 50
    - destination:
        host: duckling.com
        subset: v2
      weight: 50
EOF

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  http:
  - route:
    - destination:
        host: duckling.com
        subset: v2
EOF

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  ports:
  - number: 80
    name: http
    protocol: HTTP
  location: MESH_EXTERNAL
  resolution: STATIC
  endpoints:
  - address: 172.24.29.118
    ports:
      http: 80
    labels:
      version: v1
  - address: 172.24.29.119
    ports:
      http: 80
    labels:
      version: v2
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: duckling
spec:
  hosts:
  - duckling.com
  http:
  - match:
    - headers:
        end-user:
          exact: OneMore
    route:
    - destination:
        host: duckling.com
        subset: v2
  - route:
    - destination:
        host: duckling.com
        subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: duckling
spec:
  host: duckling.com
  subsets:
    - labels:
        version: v1
      name: v1
    - labels:
        version: v2
      name: v2
EOF

export SLEEP_POD=$(kubectl get pods -l app=sleep -o 'jsonpath={.items[0].metadata.name}')
kubectl exec "$SLEEP_POD" -c sleep -- curl -s http://duckling.com/

kubectl exec "$SLEEP_POD" -c sleep -- curl -H "end-user:OneMore" -s http://duckling.com/