目前已經是K8S SIG的標準API,稱為Gateway API。

安裝 Gateway API CRDs

目前 Gateway API 還不包含在 K8S 中,下面會安裝基本的三種資源:
 
  • GatewayClass
  • Gateway
  • HTTPRoute
[[email protected] ContourGatewayApi]# kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/download/v0.6.0/standard-install.yaml
customresourcedefinition.apiextensions.k8s.io/gatewayclasses.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/gateways.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/httproutes.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/referencegrants.gateway.networking.k8s.io configured
namespace/gateway-system unchanged
validatingwebhookconfiguration.admissionregistration.k8s.io/gateway-api-admission configured
service/gateway-api-admission-server unchanged
deployment.apps/gateway-api-admission-server configured
serviceaccount/gateway-api-admission unchanged
clusterrole.rbac.authorization.k8s.io/gateway-api-admission unchanged
clusterrolebinding.rbac.authorization.k8s.io/gateway-api-admission unchanged
role.rbac.authorization.k8s.io/gateway-api-admission unchanged
rolebinding.rbac.authorization.k8s.io/gateway-api-admission unchanged
job.batch/gateway-api-admission unchanged
job.batch/gateway-api-admission-patch unchanged

安裝 Contour Gateway

Contour 替我們準備了「懶人安裝包」:
 
[[email protected] ContourGatewayApi]# kubectl apply -f https://projectcontour.io/quickstart/contour-gateway-provisioner.yaml
customresourcedefinition.apiextensions.k8s.io/contourconfigurations.projectcontour.io created
customresourcedefinition.apiextensions.k8s.io/contourdeployments.projectcontour.io created
customresourcedefinition.apiextensions.k8s.io/extensionservices.projectcontour.io created
customresourcedefinition.apiextensions.k8s.io/httpproxies.projectcontour.io created
customresourcedefinition.apiextensions.k8s.io/tlscertificatedelegations.projectcontour.io created
customresourcedefinition.apiextensions.k8s.io/gatewayclasses.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/gateways.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/httproutes.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/referencegrants.gateway.networking.k8s.io configured
customresourcedefinition.apiextensions.k8s.io/referencepolicies.gateway.networking.k8s.io created
customresourcedefinition.apiextensions.k8s.io/tcproutes.gateway.networking.k8s.io created
customresourcedefinition.apiextensions.k8s.io/tlsroutes.gateway.networking.k8s.io created
customresourcedefinition.apiextensions.k8s.io/udproutes.gateway.networking.k8s.io created
namespace/gateway-system unchanged
validatingwebhookconfiguration.admissionregistration.k8s.io/gateway-api-admission configured
service/gateway-api-admission-server unchanged
deployment.apps/gateway-api-admission-server configured
serviceaccount/gateway-api-admission unchanged
clusterrole.rbac.authorization.k8s.io/gateway-api-admission unchanged
clusterrolebinding.rbac.authorization.k8s.io/gateway-api-admission unchanged
role.rbac.authorization.k8s.io/gateway-api-admission unchanged
rolebinding.rbac.authorization.k8s.io/gateway-api-admission unchanged
job.batch/gateway-api-admission unchanged
job.batch/gateway-api-admission-patch unchanged
namespace/projectcontour created
serviceaccount/contour-gateway-provisioner created
clusterrole.rbac.authorization.k8s.io/contour-gateway-provisioner created
role.rbac.authorization.k8s.io/contour-gateway-provisioner created
rolebinding.rbac.authorization.k8s.io/contour-gateway-provisioner-leader-election created
clusterrolebinding.rbac.authorization.k8s.io/contour-gateway-provisioner created
deployment.apps/contour-gateway-provisioner created
然後等待 projectcontournamespace 下的 contour-gateway-provisioner這個 pod 啟動:
 
[[email protected] ContourGatewayApi]# kubectl get pods -n projectcontour -o wide --watch
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
contour-echo-gateway-847f9494f4-j2z9c 1/1 Running 0 30m 10.42.1.174 node3 <none> <none>
contour-echo-gateway-847f9494f4-xkvbt 1/1 Running 0 30m 10.42.2.201 node2 <none> <none>
contour-gateway-provisioner-7c9896c66-hp2j7 1/1 Running 0 35m 10.42.1.172 node3 <none> <none>

測試資源:echo.yaml

這個 manifest 定義了所有東西:
 
  • Deployment:3 個 echo-serverpod (port 3000)
  • ClusterIP Service (port 8080)
  • GatewayClass (Contour)
  • Gateway (Contour, port 80)
  • HTTPRoute (/echo)
這裡建的 GatewayClass 一定會在 projectcontournamespace,但 Gateway 可以在別的地方。
 
HTTPRoute 會同時指向 Gateway 以及它要對應的服務,而就筆者草率測試,HTTPRoute 似乎必須服務位在同一個 namespace,而這也反映了各 namespace 可以管理自己的 HTTPRoute 而不影響其他 namespace。
 
#
# Deployment
#
apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo-deployment
  namespace: echo
spec:
  selector:
    matchLabels:
      app: echo-app
  replicas: 3
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: echo-app
    spec:
      containers:
        - name: echo-app
          image: ealen/echo-server:latest
          imagePullPolicy: Always
          env:
            - name: PORT
              value: "3000"
          ports:
            - containerPort: 3000
---
#
# Service
#
apiVersion: v1
kind: Service
metadata:
  name: echo-service
  namespace: echo
spec:
  type: ClusterIP
  selector:
    app: echo-app
  ports:
    - name: http
      protocol: TCP
      port: 8080
      targetPort: 3000
---
#
# GatewayClass
#
apiVersion: gateway.networking.k8s.io/v1beta1
kind: GatewayClass
metadata:
  name: contour
  namespace: projectcontour
spec:
  controllerName: projectcontour.io/gateway-controller
---
#
# Gateway
#
apiVersion: gateway.networking.k8s.io/v1beta1
kind: Gateway
metadata:
  name: echo-gateway
  namespace: projectcontour
spec:
  gatewayClassName: contour
  listeners:
    - name: http
      protocol: HTTP
      port: 80
      allowedRoutes:
        kinds:
          - kind: HTTPRoute
        namespaces:
          from: All
---
#
# HTTPRoute
#
apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: echo-route
  namespace: echo
spec:
  parentRefs:
    - name: echo-gateway
      namespace: projectcontour
  rules:
    - backendRefs:
        - name: echo-service
          namespace: echo
          port: 8080
      matches:
        - path:
            type: PathPrefix
            value: /echo
首先建立 echonamespace:
kubectl create ns echo
 
然後部署以上資源:
kubectl apply -f echo.yaml
 
來查看一下 HTTPRoute 的內容:
kubectl describe -n echo httproute
 
得到
[[email protected] ContourGatewayApi]# kubectl describe -n echo httproute
Name:         echo-route
Namespace:    echo
Labels:       <none>
Annotations:  <none>
API Version:  gateway.networking.k8s.io/v1beta1
Kind:         HTTPRoute
Metadata:
  Creation Timestamp:  2022-12-28T06:06:19Z
  Generation:          1
  Managed Fields:
    API Version:  gateway.networking.k8s.io/v1beta1
    Fields Type:  FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .:
          f:kubectl.kubernetes.io/last-applied-configuration:
      f:spec:
        .:
        f:parentRefs:
        f:rules:
    Manager:      kubectl-client-side-apply
    Operation:    Update
    Time:         2022-12-28T06:06:19Z
    API Version:  gateway.networking.k8s.io/v1beta1
    Fields Type:  FieldsV1
    fieldsV1:
      f:status:
        .:
        f:parents:
    Manager:         contour
    Operation:       Update
    Subresource:     status
    Time:            2022-12-28T06:06:31Z
  Resource Version:  37097190
  UID:               5dbd95e1-d09a-4d37-b78e-a1cdb18a85b8
Spec:
  Parent Refs:
    Group:      gateway.networking.k8s.io
    Kind:       Gateway
    Name:       echo-gateway
    Namespace:  projectcontour
  Rules:
    Backend Refs:
      Group:      
      Kind:       Service
      Name:       echo-service
      Namespace:  echo
      Port:       8080
      Weight:     1
    Matches:
      Path:
        Type:   PathPrefix
        Value:  /echo
Status:
  Parents:
    Conditions:
      Last Transition Time:  2022-12-28T06:06:31Z
      Message:               Accepted HTTPRoute
      Observed Generation:   1
      Reason:                Accepted
      Status:                True
      Type:                  Accepted
    Controller Name:         projectcontour.io/gateway-controller
    Parent Ref:
      Group:      gateway.networking.k8s.io
      Kind:       Gateway
      Name:       echo-gateway
      Namespace:  projectcontour
Events:           <none>

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