[kubernetes]-cert-manager管理证书生命周期

我就是我 2023-01-17 09:27 129阅读 0赞

导语：大致记录一下学习视频中helm安装Cert-Manager的过程

Cert-Manager管理tls证书

作用：管理证书，可以生成自签名证书，可以去证书颁发机构生成证书，在证书快要过期的时候续签

![534cd5a95fdac02bf2f21212b8525b4e.png][]

安装Cert-Manager

kubectl create ns cert-manager
    # 忽略有效性的检查
    kubectl label certmanager.k8s.io/disable-validation=true  -n cert-manager
    # 安装crd  https://github.com/jetstack/cert-manager/blob/release-0.9/deploy/manifests/00-crds.yaml
    kubectl apply -f 00-crds.yaml

helm install cert-manager -n cert-manager --version v0.9.1 cert-manager

部署阿里dns的webhook 通过它来验证dns

自定义策略

![d2be4a862254fb4ae261d45ebd1b6d22.png][]

再给用户添加刚刚自己创建的自定义权限

创建secret

kubectl -n cert-manager create secret generic alidns-credentials --from-literal=accessKeySecret='阿里云的accessKeySecret'

![9e4522ead73b70f3508b5ce7eaf1a870.png][]

创建rbac权限 让webhook可以读取secret

cert-manager-webhook-alidns-secret-reader.yaml

---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: ClusterRole
    metadata:
      name: cert-manager-webhook-alidns:secret-reader
    rules:
      - apiGroups:
          - ''
        resources:
          - 'secrets'
        resourceNames:
          - 'alidns-credentials'
        verbs:
          - 'get'
          - 'watch'
    ---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: ClusterRoleBinding
    metadata:
      name: cert-manager-webhook-alidns:secret-reader
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: cert-manager-webhook-alidns:secret-reader
    subjects:
      - apiGroup: ""
        kind: ServiceAccount
        name: cert-manager-webhook-alidns
        namespace: cert-manager

kubectl apply -f cert-manager-webhook-alidns-secret-reader.yaml

安装webhook

helm instakk cert-manager-webhook-alidns -n cert-manager cert-manager-webhook-alidns/deploy/webhook-alidns

定义issuer

./config/cert-manager/letsencrypt-clusterissuer-prod.yamlc

apiVersion: certmanager.k8s.io/v1alpha1
    kind: ClusterIssuer
    metadata:
      name: letsencrypt-prod
    spec:
      acme:
        # The ACME server URL
        server: https://acme-v02.api.letsencrypt.org/directory
        # Email address used for ACME registration
        email: <shidongliang@me.com>
        # Name of a secret used to store the ACME account private key
        privateKeySecretRef:
          name: letsencrypt-prod
        solvers:
        - selector:
            dnsNames:
            - '*.hipstershop.cn'
          dns01:
            webhook:
              config:
                accessKeyId: LTAI4FsNjCkUidDwNTZ1xxxxxr
                accessKeySecretRef:
                  key: accessKeySecret
                  name: alidns-credentials
                regionId: "cn-beijing"
                ttl: 600
              groupName: acme.hipstershop.cn
              solverName: alidns

kubectl apply -f ./config/cert-manager/letsencrypt-clusterissuer-prod.yaml

通过certificate申请一个证书./config/cert-manager/certificate.yaml

---
    apiVersion: certmanager.k8s.io/v1alpha1
    kind: Certificate
    metadata:
      name: wildcard-hipstershop-cn
    spec:
      secretName: wildcard-hipstershop-cn-tls
      renewBefore: 240h
      dnsNames:
      - '*.hipstershop.cn'
      issuerRef:
        name: letsencrypt-prod
        kind: ClusterIssuer

kubectl apply -f ./config/cert-manager/certificate.yaml
    kubectl  get secret

![d7be9d90cc8eb7ae5f2d6a11eef21151.png][]

通过ingress 使用tls证书

略

通过ingress直接申请tls证书

echo-nginx-ingress-letsencrypt.yaml

apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: echo-nginx-ingress
      annotations:
        kubernetes.io/ingress.class: nginx
        certmanager.k8s.io/cluster-issuer: letsencrypt-prod # 调用的issuer
    spec:
      tls:
      - hosts:
        - '*.hipstershop.cn'
        secretName: letsencrypt-prod
      rules:
      - hostL echo.hipstershop.cn
        http:
          path:
          - path: /
            backend:
              serviceName:  echo
              servicePort: 80

更新ingress应用

kubectl apply -f echo-nginx-ingress-letsencrypt.yaml
    kubectl  get ingress
    kubectl describe ingress echo-nginx-ingress

查看证书生成的order

kubectl get order 
    kubectl describe order wildcard-hipstershop-cn-xxxxx

查看challenge

# 需要在创建的时候看  创建完成之后会自动删除
    kubectl get challenge -w

[534cd5a95fdac02bf2f21212b8525b4e.png]: /images/20221021/257d843e77df4993ab024ac283a1c1b1.png
[d2be4a862254fb4ae261d45ebd1b6d22.png]: /images/20221021/8ce18fd88e924a19af728c0362ed4d56.png
[9e4522ead73b70f3508b5ce7eaf1a870.png]: /images/20221021/a9dd14f1c61644fe94f63c494914025a.png
[d7be9d90cc8eb7ae5f2d6a11eef21151.png]: /images/20221021/43f814d287494ea2ba851e629cc955e3.png