如何使用Istio API配置网关路由规则

ASM支持使用Istio API（Gateway, VirtualService, DestinationRule）配置网关、路由规则策略。本文介绍如何通过YAML创建资源对象启用该能力。

使用以下内容，保存为deployment.yaml文件，创建istio-ingressgateway deployment工作负载。

kind: Deployment
apiVersion: apps/v1
metadata:
  name: istio-ingressgateway 
  namespace: default # 命名空间名称，按需替换
spec:
  replicas: 1 # 工作负载实例数，按需替换
  selector:
    matchLabels:
      app: istio-ingressgateway
      istio: ingressgateway
  template:
    metadata:
      labels:
        app: istio-ingressgateway
        istio: ingressgateway
        istio.io/rev: default
        service.istio.io/canonical-name: istio-ingressgateway
        service.istio.io/canonical-revision: latest
        sidecar.istio.io/inject: 'false'
      annotations:
        sidecar.istio.io/inject: 'false'
    spec:
      volumes:
        - name: workload-socket
          emptyDir: {}
        - name: credential-socket
          emptyDir: {}
        - name: workload-certs
          emptyDir: {}
        - name: istiod-ca-cert
          configMap:
            name: istio-ca-root-cert
            defaultMode: 384
        - name: podinfo
          downwardAPI:
            items:
              - path: labels
                fieldRef:
                  apiVersion: v1
                  fieldPath: metadata.labels
              - path: annotations
                fieldRef:
                  apiVersion: v1
                  fieldPath: metadata.annotations
            defaultMode: 416
        - name: istio-envoy
          emptyDir: {}
        - name: istio-data
          emptyDir: {}
        - name: istio-token
          secret:
            defaultMode: 420
            optional: false
            secretName: cp-access-default
        - name: config-volume
          configMap:
            name: istio
            defaultMode: 416
            optional: true
        - name: ingressgateway-certs
          secret:
            secretName: istio-ingressgateway-certs
            defaultMode: 384
            optional: true
        - name: ingressgateway-ca-certs
          secret:
            secretName: istio-ingressgateway-ca-certs
            defaultMode: 384
            optional: true
      containers:
        - name: istio-proxy
          image: swr.cn-north-7.myhuaweicloud.com/asm/proxyv2:1.15.5-r1-20230719152011 # proxyv2镜像地址替换
          args:
            - proxy
            - router
            - '--domain'
            - $(POD_NAMESPACE).svc.cluster.local
            - '--proxyLogLevel=warning'
            - '--proxyComponentLogLevel=misc:error'
            - '--log_output_level=default:info'
          ports:
            - containerPort: 15021
              protocol: TCP
            - containerPort: 8080
              protocol: TCP
            - containerPort: 8443
              protocol: TCP
            - name: http-envoy-prom
              containerPort: 15090
              protocol: TCP
          env:
            - name: JWT_POLICY
              value: third-party-jwt
            - name: PILOT_CERT_PROVIDER
              value: istiod
            - name: CA_ADDR
              value: asm-mesh.kube-system.svc.cluster.local:15012
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: spec.nodeName
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: metadata.namespace
            - name: INSTANCE_IP
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.podIP
            - name: PROXY_CONFIG
              value: | 
                {"discoveryAddress":"asm-mesh.kube-system.svc.cluster.local:15012"}
            - name: HOST_IP
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.hostIP
            - name: SERVICE_ACCOUNT
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: spec.serviceAccountName
            - name: ISTIO_META_WORKLOAD_NAME
              value: istio-ingressgateway
            - name: ISTIO_META_OWNER
              value: kubernetes://apis/apps/v1/namespaces/default/deployments/istio-ingressgateway  # default替换为对应的命名空间名称
            - name: ISTIO_META_MESH_ID
              value: whtest # 替换为实际的网格名称
            - name: TRUST_DOMAIN
              value: cluster.local
            - name: ISTIO_META_UNPRIVILEGED_POD
              value: 'true'
            - name: ISTIO_ADDITIONAL_METADATA_EXCHANGE_KEYS
              value: ASM_MESH_ID,ASM_CLUSTER_ID
            - name: ISTIO_META_ASM_CLUSTER_ID
              value: 92311000-df43-11ed-b108-0255ac1001bb # 替换为实际的集群ID
            - name: ISTIO_META_ASM_MESH_ID
              value: a8653674-3fd2-11ee-9e48-0255ac100695 # 替换为实际的网格ID
            - name: ISTIO_META_CLUSTER_ID
              value: mesh-test # 替换为实际的集群名称
          resources:
            limits:
              cpu: '2'
              memory: 1Gi
            requests:
              cpu: 100m
              memory: 128Mi
          volumeMounts:
            - name: workload-socket
              mountPath: /var/run/secrets/workload-spiffe-uds
            - name: credential-socket
              mountPath: /var/run/secrets/credential-uds
            - name: workload-certs
              mountPath: /var/run/secrets/workload-spiffe-credentials
            - name: istio-envoy
              mountPath: /etc/istio/proxy
            - name: config-volume
              mountPath: /etc/istio/config
            - name: istiod-ca-cert
              mountPath: /var/run/secrets/istio
            - name: istio-token
              readOnly: true
              mountPath: /var/run/secrets/tokens
            - name: istio-data
              mountPath: /var/lib/istio/data
            - name: podinfo
              mountPath: /etc/istio/pod
            - name: ingressgateway-certs
              readOnly: true
              mountPath: /etc/istio/ingressgateway-certs
            - name: ingressgateway-ca-certs
              readOnly: true
              mountPath: /etc/istio/ingressgateway-ca-certs
          readinessProbe:
            httpGet:
              path: /healthz/ready
              port: 15021
              scheme: HTTP
            initialDelaySeconds: 1
            timeoutSeconds: 1
            periodSeconds: 2
            successThreshold: 1
            failureThreshold: 30
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
          securityContext:
            capabilities:
              drop:
                - ALL
            privileged: false
            readOnlyRootFilesystem: true
            allowPrivilegeEscalation: false
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      dnsPolicy: ClusterFirst
      securityContext:
        runAsUser: 1337
        runAsGroup: 1337
        runAsNonRoot: true
        fsGroup: 1337
        seccompProfile:
          type: RuntimeDefault
      affinity:
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 1
              preference:
                matchExpressions:
                  - key: istio
                    operator: In
                    values:
                      - master
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - istio-ingressgateway
              topologyKey: kubernetes.io/hostname
      schedulerName: default-scheduler
      tolerations:
        - key: istio
          operator: Exists
          effect: NoExecute
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 10%
  revisionHistoryLimit: 10
  progressDeadlineSeconds: 600

执行以下命令，在当前集群中创建网关工作负载。

kubectl create -f deployment.yaml

使用以下内容，保存为svc.yaml文件，创建istio-ingressgateway loadbalancer service。

apiVersion: v1
kind: Service
metadata:
  name: gw-svc1
  namespace: default # 命名空间名称，按需替换
  annotations:
    kubernetes.io/elb.class: union # elb实例类型，union共享型，performance独享型
    kubernetes.io/elb.id: 73febb1c-b191-4fd9-832e-138b2657d3b1 # elb实例ID，可通过在cce服务发现创建负载均衡类型服务页查看可选择的elb实例
spec:
  ports:
    - name: http-gw-svc1-port1 # 端口名称，注意以服务协议打头
      protocol: TCP
      port: 707 # 对外访问端口
      targetPort: 1026 # 容器端口，必须大于1024，且不能与网格内其他网关服务使用的targetPort端口重复
  selector:
    app: istio-ingressgateway
    istio: ingressgateway
  type: LoadBalancer
  sessionAffinity: None
  externalTrafficPolicy: Cluster
  ipFamilies:
    - IPv4
  ipFamilyPolicy: SingleStack
  allocateLoadBalancerNodePorts: true
  internalTrafficPolicy: Cluster

执行以下命令，在当前集群中创建网关工作负载对应的loadbalancer service。

kubectl create -f svc.yaml

以上步骤1、2使用的kubectl连接的是当前集群。

使用以下内容，保存为gw.yaml文件，创建Istio Gateway配置。

apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: my-gateway
  namespace: default # 命名空间名称，按需替换
spec:
  selector:
    istio: ingressgateway
  servers: 
    - hosts:
        - 100.85.115.86 # 使用的elb实例公网IP
      port:
        name: http-48382bd9
        number: 1026 # 同上lb svc的targetPort
        protocol: http

执行以下命令，在网格控制面中创建网关Gateway资源对象。

kubectl create -f gw.yaml

使用以下内容，保存为vs.yaml文件，创建Istio VirtualService配置。

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: nginx
  namespace: default # 命名空间名称，按需替换
spec:
  hosts:
  - 100.95.150.38  # 使用的elb实例公网IP
  gateways:
  - default/my-gateway # 使用步骤3的gw的命名空间、名称
  http:
  - match:
    - headers:
        cookie:
          exact: "user=dev-123"
    route:
    - destination:
        port:
          number: 1234
        host: nginx.default.svc.cluster.local

执行以下命令，在网格控制面中创建VirtualService资源对象。

kubectl create -f vs.yaml

以上步骤3、4使用的kubectl连接的是网格控制面，如何配置网格kubectl，请参考使用kubectl连接网格控制面。

结果验证。执行以下命令，访问nginx服务成功。

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