Azure Kubernetes - Istio Egress 不工作

Question

我使用以下配置来设置 Istio

cat << EOF | kubectl apply -f -
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  namespace: istio-system
  name: istio-control-plane
spec:
  # Use the default profile as the base
  # More details at: https://istio.io/docs/setup/additional-setup/config-profiles/
  profile: default
  # Enable the addons that we will want to use
  addonComponents:
    grafana:
      enabled: true
    prometheus:
      enabled: true
    tracing:
      enabled: true
    kiali:
      enabled: true
  values:
    global:
      # Ensure that the Istio pods are only scheduled to run on Linux nodes
      defaultNodeSelector:
        beta.kubernetes.io/os: linux
    kiali:
      dashboard:
        auth:
          strategy: anonymous
  components:
    egressGateways:
    - name: istio-egressgateway
      enabled: true
EOF

我可以看到 istio 服务

kubectl 获取 svc -n istio-system

我已经部署了睡眠应用

kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.7/samples/sleep/sleep.yaml
-n akv2k8s-test

并已部署 ServiceEntry

kubectl apply -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: httpbin-ext
  namespace: akv2k8s-test
spec:
  hosts:
  - httpbin.org
  ports:
  - number: 80
    name: http
    protocol: HTTP
  resolution: DNS
  location: MESH_EXTERNAL
EOF

并尝试访问外部 URL

export SOURCE_POD=$(kubectl get -n  akv2k8s-test  pod -l app=sleep -o jsonpath='{.items..metadata.name}')
kubectl exec "$SOURCE_POD"  -n  akv2k8s-test  -c sleep -- curl -sI http://httpbin.org/headers | grep  "HTTP/"; 

但是我看不到代理上报告的任何日志

kubectl logs "$SOURCE_POD" -n  akv2k8s-test -c istio-proxy | tail

根据文档我应该看到这个

但是我没有看到标题

我错过了什么吗？

Answer 1

我得到了它，如下所述

cat << EOF | kubectl apply -f -
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  namespace: istio-system
  name: istio-control-plane
spec:
  # Use the default profile as the base
  # More details at: https://istio.io/docs/setup/additional-setup/config-profiles/
  profile: default
  # Enable the addons that we will want to use
  addonComponents:
    grafana:
      enabled: true
    prometheus:
      enabled: true
    tracing:
      enabled: true
    kiali:
      enabled: true
  values:
    global:
      # Ensure that the Istio pods are only scheduled to run on Linux nodes
      defaultNodeSelector:
        beta.kubernetes.io/os: linux
    kiali:
      dashboard:
        auth:
          strategy: anonymous
  components:
    egressGateways:
    - name: istio-egressgateway
      enabled: true
  meshConfig:
    accessLogFile: /dev/stdout
    outboundTrafficPolicy:
      mode: REGISTRY_ONLY
EOF


cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Namespace
metadata:
  name: akv2k8s-test
  labels:
    istio-injection: enabled
    azure-key-vault-env-injection: enabled
---
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: cnn
  namespace: akv2k8s-test
spec:
  hosts:
  - edition.cnn.com
  ports:
  - number: 80
    name: http-port
    protocol: HTTP
  - number: 443
    name: https
    protocol: HTTPS
  resolution: DNS
---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: istio-egressgateway
  namespace: akv2k8s-test
spec:
  selector:
    istio: egressgateway
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - edition.cnn.com
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: egressgateway-for-cnn
  namespace: akv2k8s-test
spec:
  host: istio-egressgateway.istio-system.svc.cluster.local
  subsets:
  - name: cnn
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: direct-cnn-through-egress-gateway
  namespace: akv2k8s-test
spec:
  hosts:
  - edition.cnn.com
  gateways:
  - istio-egressgateway
  - mesh
  http:
  - match:
    - gateways:
      - mesh
      port: 80
    route:
    - destination:
        host: istio-egressgateway.istio-system.svc.cluster.local
        subset: cnn
        port:
          number: 80
      weight: 100
  - match:
    - gateways:
      - istio-egressgateway
      port: 80
    route:
    - destination:
        host: edition.cnn.com
        port:
          number: 80
      weight: 100
EOF

kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.7/samples/sleep/sleep.yaml -n akv2k8s-test
export SOURCE_POD=$(kubectl get pod -l app=sleep -n akv2k8s-test -o jsonpath={.items..metadata.name})
kubectl exec "$SOURCE_POD" -n akv2k8s-test -c sleep -- curl -sL -o /dev/null -D - http://edition.cnn.com/politics
kubectl logs -l istio=egressgateway -c istio-proxy -n istio-system | tail


kubectl delete -n akv2k8s-test gateway istio-egressgateway
kubectl delete -n akv2k8s-test serviceentry cnn
kubectl delete -n akv2k8s-test virtualservice direct-cnn-through-egress-gateway
kubectl delete -n akv2k8s-test destinationrule egressgateway-for-cnn

Answer 2

只是为了澄清 Karthikeyan Vijayakumar 做了什么来完成这项工作。

理论上 istio Egress Gateway 在这里不起作用，因为您没有使用它，您只是使用 istio Service Entry 从您的 Istio 集群中访问可公开访问的 service edition.cnn.com。

查看文档here，您需要更多的组件才能实际使用它。

根据上述文档点 3 和 4，您缺少 Egress Gateway、Destination Rule 和 Virtual Service。

服务条目允许将额外的条目添加到 Istio 的内部服务注册表中，以便网格中自动发现的服务可以访问/路由到这些手动指定的服务。这不像您启用出口网关，只是每个流量都通过出口网关。

当您添加以下依赖项时，流量如下所示，我假设您正在使用集群内的 pod 与外部服务进行通信。

[sleep pod - envoy sidecar] -> 网状网关 -> 出口网关 -> 外部服务