环境信息：
k8s：1.23.1
helm：3.8.1
已备案域名：chandz.com

一、基础环境配置

0、镜像列表

quay.io/jetstack/cert-manager-cainjector:v1.7.2
quay.io/jetstack/cert-manager-controller:v1.7.2
quay.io/jetstack/cert-manager-webhook:v1.7.2
pragkent/alidns-webhook:0.1.1

1、安装cert-manager

yaml安装:
kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.7.2/cert-manager.yaml

helm 安装
helm repo add jetstack https://charts.jetstack.io
helm search repo cert-manager
kubectl create namespace cert-manager

helm install cert-manager jetstack/cert-manager --namespace cert-manager --version v1.7.2 --set installCRDs=true

2、获取阿里云ak/sk(权限为AliyunDNSFullAccess，也可以使用自定义权限，具体可参考阿里云官方文档)


3、创建一个有阿里dns修改权限ak/sk的secert

kubectl apply -f alidns-secret.yaml

#alidns-secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: alidns-secret
  namespace: cert-manager
stringData:
  access-key: YOUR_ACCESS_KEY #阿里云dns权限ak
  secret-key: YOUR_SECRET_KEY #阿里云dns权限sk

4、安装alidns的webhook

wget https://raw.githubusercontent.com/pragkent/alidns-webhook/master/deploy/bundle.yaml

修改文件中的acme.yourcompany.com为自己的域名
sed -i s/'acme.yourcompany.com'/'acme.chandz.com'/g bundle.yaml

5、创建clusterIssuer

kubectl  apply -f clusterissuer.yaml
kubectl  get clusterissuers.cert-manager.io

#clusterissuer.yaml
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt
spec:
  acme:
    # Change to your letsencrypt email
    email: duanshuaixing@gmail.com #申请者邮箱地址
    server: https://acme-v02.api.letsencrypt.org/directory
    privateKeySecretRef:
      name: letsencrypt-account-key
    solvers:
    - dns01:
        webhook:
          groupName: acme.chandz.com #须和bundle.yaml文件中定义的groupname 一致
          solverName: alidns
          config:
            region: ""
            accessKeySecretRef:
              name: alidns-secret
              key: access-key
            secretKeySecretRef:
              name: alidns-secret
              key: secret-key

6、创建certificate

#创建certificate
kubectl apply -f certificate.yaml

#查看 certificate
kubectl  get certificate #刚创建certificate ready状态为false,会自动在dns解析创建txt记录去签发证书ready字段会变为true

#查看证书
kubectl get secrets chandz-com-tls -o json |jq --raw-output '.data["tls.crt"]'|base64 -d

#certificate.yaml
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: chandz-com-tls
spec:
  secretName: chandz-com-tls
  dnsNames: #dnsNames 指示该证书的可以用于哪些域名
  - chandz.com
  - "*.chandz.com"
  issuerRef:
    name: letsencrypt
    kind: ClusterIssuer

二、使用证书

kubectl apply -f nginx.yaml

#nginx.yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx:latest
        name: nginx
        imagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-https
  namespace: default
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: tls-ingress
spec:
  ingressClassName: nginx
  rules:
  - host: "tls-test.chandz.com"
    http:
      paths:
      - pathType: ImplementationSpecific
        path:
        backend:
          service:
            name: nginx-https
            port:
              number: 80
  tls:
  - hosts:
    - tls-test.chandz.com
    secretName: chandz-com-tls

三、代码地址

https://github.com/duanshuaixing/tools/tree/master/cert-mamager