1 - 网络

1.1 - 切换到其他 Kubernetes Gateway 实现

您可以以更简单、厂商中立的方式切换到任何支持 Kubernetes Gateway API网关实现,如 Contour、Istio、Apache APISIX、Envoy Gateway(未来)等。

例如,您可以选择使用 Istio 作为底层的 Kubernetes Gateway,如下所示:

  1. 安装 OpenFunction,但不包括 Contour
helm install openfunction --set global.Contour.enabled=false openfunction/openfunction -n openfunction
  1. 安装 Istio,然后启用其 Knative 集成:
kubectl apply -l knative.dev/crd-install=true -f https://github.com/knative/net-istio/releases/download/knative-v1.3.0/istio.yaml
kubectl apply -f https://github.com/knative/net-istio/releases/download/knative-v1.3.0/istio.yaml
kubectl apply -f https://github.com/knative/net-istio/releases/download/knative-v1.3.0/net-istio.yaml
  1. 创建一个名为 istioGatewayClass
kubectl apply -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: GatewayClass
metadata:
  name: istio
spec:
  controllerName: istio.io/gateway-controller
  description: The default Istio GatewayClass
EOF
  1. 创建一个 OpenFunction Gateway
kubectl apply -f - <<EOF
apiVersion: networking.openfunction.io/v1alpha1
kind: Gateway
metadata:
  name: custom-gateway
  namespace: openfunction
spec:
  domain: ofn.io
  clusterDomain: cluster.local
  hostTemplate: "{{.Name}}.{{.Namespace}}.{{.Domain}}"
  pathTemplate: "{{.Namespace}}/{{.Name}}"
  gatewayDef:
    namespace: openfunction
    gatewayClassName: istio
  gatewaySpec:
    listeners:
    - name: ofn-http-external
      protocol: HTTP
      port: 80
      allowedRoutes:
        namespaces:
          from: All
EOF
  1. FunctiongatewayRef 字段中引用自定义的 OpenFunction Gateway(Istio):
kubectl apply -f - <<EOF
apiVersion: core.openfunction.io/v1beta2
kind: Function
metadata:
  name: function-sample
spec:
  version: "v1.0.0"
  image: "openfunctiondev/v1beta1-http:latest"
  serving:
    template:
      containers:
        - name: function
          imagePullPolicy: Always
    triggers:
      http:
        route:
          gatewayRef:
            name: custom-gateway
            namespace: openfunction
EOF

1.2 - 配置本地域名

配置本地域名

通过配置本地域名,您可以通过函数的外部地址从 Kubernetes 集群内部访问函数。

基于 Gateway.spec.domain 配置 CoreDNS

假设您有一个定义了此 domain*.ofn.ioGateway,您需要通过以下命令更新 CoreDNS 配置:

  1. 编辑 coredns 配置映射:
kubectl -n kube-system edit cm coredns -o yaml
  1. .:53 部分的配置文件中添加 rewrite stop name regex .*\.ofn\.io gateway.openfunction.svc.cluster.local,例如:
apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health {
           lameduck 5s
        }
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        rewrite stop name regex .*\.ofn\.io gateway.openfunction.svc.cluster.local
        prometheus :9153
        forward . /etc/resolv.conf {
           max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
    }    
...

基于 Gateway.spec.domain 配置 nodelocaldns

如果您也在使用 nodelocaldns,如 Kubesphere,您需要通过以下命令更新 nodelocaldns 配置:

  1. 编辑 nodelocaldns 配置映射:
kubectl -n kube-system edit cm nodelocaldns -o yaml
  1. 在配置文件中添加 ofn.io:53 部分,例如:
apiVersion: v1
data:
  Corefile: |
    ofn.io:53 {
        errors
        cache {
            success 9984 30
            denial 9984 5
        }
        reload
        loop
        bind 169.254.25.10
        forward . 10.233.0.3 {
            force_tcp
        }
        prometheus :9253
    }
    cluster.local:53 {
        errors
        cache {
            success 9984 30
            denial 9984 5
        }
        reload
        loop
        bind 169.254.25.10
        forward . 10.233.0.3 {
            force_tcp
        }
        prometheus :9253
        health 169.254.25.10:9254
    }
    .:53 {
        errors
        cache 30
        reload
        loop
        bind 169.254.25.10
        forward . /etc/resolv.conf
        prometheus :9253
    }    
...