使用cert-manager istio ingress和LetsEncrypt在kubernetes中配置SSL证书

Question

我正在尝试使用cert-manager，istio ingress和LetsEncrypt在kubernetes中配置SSL证书。我已经使用helm，cert-manager安装了istio，创建了ClusterIssuer，然后我正在尝试创建一个Certificate。极致挑战无法验证，我正在尝试使用http01并且无法弄清楚如何使用istio ingress。 Istio部署有以下选项：

helm install --name istio install/kubernetes/helm/istio `
--namespace istio-system `
--set global.controlPlaneSecurityEnabled=true `
--set grafana.enabled=true`
--set tracing.enabled=true 
--set kiali.enabled=true `
--set ingress.enabled=true

证书配置：

apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: example.com
  namespace: istio-system
spec:
  secretName: example.com
  issuerRef:
    name: letsencrypt-staging
    kind: ClusterIssuer
  commonName: 'example.com'
  dnsNames:
  - example.com
  acme:
    config:
    - http01:
        ingress: istio-ingress
      domains:
      - example.com

当尝试这种方式时，由于某种原因，无法找到istio-ingress，但是当尝试指定ingressClass：some-name而不是ingress：istio-ingress时，我得到404因为example.com/.well-known/无法达到极限挑战/令牌。怎么解决这个问题？谢谢！

Answer 1

Istio ingress已被弃用，您可以将Ingress Gateway与DNS挑战一起使用。

定义通用公共入口网关：

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: public-gateway
  namespace: istio-system
spec:
  selector:
    istio: ingressgateway
  servers:
    - port:
        number: 80
        name: http
        protocol: HTTP
      hosts:
        - "*"
      tls:
        httpsRedirect: true
    - port:
        number: 443
        name: https
        protocol: HTTPS
      hosts:
        - "*"
      tls:
        mode: SIMPLE
        privateKey: /etc/istio/ingressgateway-certs/tls.key
        serverCertificate: /etc/istio/ingressgateway-certs/tls.crt

使用cert-manager支持的DNS提供程序之一创建颁发者。以下是GCP CloudDNS的配置：

apiVersion: certmanager.k8s.io/v1alpha1
kind: Issuer
metadata:
  name: letsencrypt-prod
  namespace: istio-system
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: [email protected]
    privateKeySecretRef:
      name: letsencrypt-prod
    dns01:
      providers:
      - name: cloud-dns
        clouddns:
          serviceAccountSecretRef:
            name: cert-manager-credentials
            key: gcp-dns-admin.json
          project: my-gcp-project

使用以下命令创建通配符证书：

apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: istio-gateway
  namespace: istio-system
spec:
  secretname: istio-ingressgateway-certs
  issuerRef:
    name: letsencrypt-prod
  commonName: "*.example.com"
  acme:
    config:
    - dns01:
        provider: cloud-dns
      domains:
      - "*.example.com"
      - "example.com"

颁发证书需要几分钟时间才能颁发证书：

kubectl -n istio-system describe certificate istio-gateway

Events:
  Type    Reason         Age    From          Message
  ----    ------         ----   ----          -------
  Normal  CertIssued     1m52s  cert-manager  Certificate issued successfully

你可以在这里找到关于在GKE上设置Istio ingress的分步指南，让我们在这里加密https://docs.flagger.app/install/flagger-install-on-google-cloud#cloud-dns-setup

Answer 2

解决方案是将DNS移至azure并使用dns验证生成证书。我还使用了istio-1.1.0-rc.3并按以下方式配置了网关：

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: mygateway
spec:
  selector:
    istio: ingressgateway # use istio default ingress gateway
  servers:
  - hosts:
    - 'mydomain.com'
    port:
      name: http-bookinfo
      number: 80
      protocol: HTTP
    tls:
      httpsRedirect: true
  - hosts:
    - 'mydomain.com'
    port:
      name: https-bookinfo
      number: 443
      protocol: HTTPS
    tls:      
      mode: SIMPLE
      serverCertificate: "use sds" #random string, because serverCertificate and 
      #privateKey are required for tls.mode=SIMPLE
      privateKey: "use sds" 
      credentialName: "istio-bookinfo-certs-staging" #this must match the secret name 
      #from the certificate

In order to work enable SDS at ingress gateway:

helm template install/kubernetes/helm/istio/ --name istio `
--namespace istio-system -x charts/gateways/templates/deployment.yaml `
--set gateways.istio-egressgateway.enabled=false `
--set gateways.istio-ingressgateway.sds.enabled=true > `
$HOME/istio-ingressgateway.yaml

 kubectl apply -f $HOME/istio-ingressgateway.yaml