1 安装

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helm repo add jetstack https://charts.jetstack.io
helm repo update jetstack
helm search repo jetstack

var_base=/root/helm
var_app=$var_base/cert-manager
var_version=v1.12.1
mkdir -p $var_app
cd $var_app

helm pull jetstack/cert-manager --version $var_version
tar xf cert-manager-$var_version.tgz
mv cert-manager v1.12.1
helm show values ./v1.12.1

helm upgrade  --install --dry-run --debug \
  --namespace cert-manager \
  --create-namespace \
  --set installCRDs=true \
  cert-manager ./v1.12.1

helm upgrade  --install \
  --namespace cert-manager \
  --create-namespace \
  --set installCRDs=true \
  cert-manager ./v1.12.1

helm -n cert-manager list
watch kubectl -n cert-manager get pods

2 安装alidns

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mkdir -p $var_app/alidns-webhook
cd $var_app/alidns-webhook
#1. Install alidns-webhook
# Install alidns-webhook to cert-manager namespace. 
# kubectl apply -f https://raw.githubusercontent.com/pragkent/alidns-webhook/master/deploy/bundle.yaml
cat <<EOF | tee bundle.yaml
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: alidns-webhook
  namespace: cert-manager
  labels:
    app: alidns-webhook
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: alidns-webhook
  namespace: cert-manager
  labels:
    app: alidns-webhook
rules:
  - apiGroups:
      - ''
    resources:
      - 'secrets'
    verbs:
      - 'get'
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: alidns-webhook:flowcontrol-solver
  labels:
    app: alidns-webhook
rules:
  - apiGroups:
      - "flowcontrol.apiserver.k8s.io"
    resources:
      - 'prioritylevelconfigurations'
      - 'flowschemas'
    verbs:
      - 'list'
      - 'watch'
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: alidns-webhook:flowcontrol-solver
  labels:
    app: alidns-webhook
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: alidns-webhook:flowcontrol-solver
subjects:
  - apiGroup: ""
    kind: ServiceAccount
    name: alidns-webhook
    namespace: cert-manager
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: alidns-webhook
  namespace: cert-manager
  labels:
    app: alidns-webhook
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: alidns-webhook
subjects:
  - apiGroup: ""
    kind: ServiceAccount
    name: alidns-webhook
    namespace: cert-manager
---
# Grant the webhook permission to read the ConfigMap containing the Kubernetes
# apiserver's requestheader-ca-certificate.
# This ConfigMap is automatically created by the Kubernetes apiserver.
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: alidns-webhook:webhook-authentication-reader
  namespace: kube-system
  labels:
    app: alidns-webhook
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
  - apiGroup: ""
    kind: ServiceAccount
    name: alidns-webhook
    namespace: cert-manager
---
# apiserver gets the auth-delegator role to delegate auth decisions to
# the core apiserver
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: alidns-webhook:auth-delegator
  namespace: cert-manager
  labels:
    app: alidns-webhook
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
  - apiGroup: ""
    kind: ServiceAccount
    name: alidns-webhook
    namespace: cert-manager
---
# Grant cert-manager permission to validate using our apiserver
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: alidns-webhook:domain-solver
  labels:
    app: alidns-webhook
rules:
  - apiGroups:
      - acme.example.com
    resources:
      - '*'
    verbs:
      - 'create'
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: alidns-webhook:domain-solver
  labels:
    app: alidns-webhook
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: alidns-webhook:domain-solver
subjects:
  - apiGroup: ""
    kind: ServiceAccount
    name: cert-manager
    namespace: cert-manager
---
# Source: alidns-webhook/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  name: alidns-webhook
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  type: ClusterIP
  ports:
    - port: 443
      targetPort: https
      protocol: TCP
      name: https
  selector:
    app: alidns-webhook
---
# Source: alidns-webhook/templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: alidns-webhook
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  replicas:
  selector:
    matchLabels:
      app: alidns-webhook
  template:
    metadata:
      labels:
        app: alidns-webhook
    spec:
      serviceAccountName: alidns-webhook
      containers:
        - name: alidns-webhook
          image: pragkent/alidns-webhook:0.1.1
          imagePullPolicy: IfNotPresent
          args:
            - --tls-cert-file=/tls/tls.crt
            - --tls-private-key-file=/tls/tls.key
          env:
            - name: GROUP_NAME
              value: "acme.example.com"
          ports:
            - name: https
              containerPort: 443
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTPS
              path: /healthz
              port: https
          readinessProbe:
            httpGet:
              scheme: HTTPS
              path: /healthz
              port: https
          volumeMounts:
            - name: certs
              mountPath: /tls
              readOnly: true
          resources:
            {}

      volumes:
        - name: certs
          secret:
            secretName: alidns-webhook-webhook-tls

---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  name: v1alpha1.acme.example.com
  labels:
    app: alidns-webhook
  annotations:
    cert-manager.io/inject-ca-from: "cert-manager/alidns-webhook-webhook-tls"
spec:
  group: acme.example.com
  groupPriorityMinimum: 1000
  versionPriority: 15
  service:
    name: alidns-webhook
    namespace: cert-manager
  version: v1alpha1

---
# Create a selfsigned Issuer, in order to create a root CA certificate for
# signing webhook serving certificates
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: alidns-webhook-selfsign
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  selfSigned: {}
---
# Generate a CA Certificate used to sign certificates for the webhook
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: alidns-webhook-ca
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  secretName: alidns-webhook-ca
  duration: 43800h # 5y
  issuerRef:
    name: alidns-webhook-selfsign
  commonName: "ca.alidns-webhook.cert-manager"
  isCA: true
---
# Create an Issuer that uses the above generated CA certificate to issue certs
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: alidns-webhook-ca
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  ca:
    secretName: alidns-webhook-ca
---
# Finally, generate a serving certificate for the webhook to use
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: alidns-webhook-webhook-tls
  namespace: cert-manager
  labels:
    app: alidns-webhook
spec:
  secretName: alidns-webhook-webhook-tls
  duration: 8760h # 1y
  issuerRef:
    name: alidns-webhook-ca
  dnsNames:
  - alidns-webhook
  - alidns-webhook.cert-manager
  - alidns-webhook.cert-manager.svc
  - alidns-webhook.cert-manager.svc.cluster.local
EOF

kubectl apply -f bundle.yaml

# 2. Create secret contains alidns credentials
cat <<EOF | tee alidns-secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: alidns-secret
  namespace: cert-manager
data:
  access-key: TFRBSTV0Nk55MmFhdHZwc0d3dzlwUm5K
  secret-key: WkJKbUtmaWJMaERGcmlHOUw1cktCcm1jZGtRdmhI
EOF

kubectl apply -f alidns-secret.yaml

# 3. Example Issuer
cat <<EOF | tee cluster-issuer.yaml
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    # Change to your letsencrypt email
    email: test@example.com
    server: https://acme-v02.api.letsencrypt.org/directory
    privateKeySecretRef:
      name: letsencrypt-prod-account-key
    solvers:
    - dns01:
        webhook:
          groupName: acme.example.com
          solverName: alidns
          config:
            region: ""
            accessKeySecretRef:
              name: alidns-secret
              key: access-key
            secretKeySecretRef:
              name: alidns-secret
              key: secret-key
EOF

kubectl apply -f cluster-issuer.yaml

# 4. Issue a certificate
cat <<EOF | tee certificate.yaml
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: example-com-tls
spec:
  secretName: example-com-tls
  commonName: example.com
  dnsNames:
  - example.com
  - "*.example.com"
  issuerRef:
    name: letsencrypt-prod
    kind: ClusterIssuer
EOF

kubectl apply -f certificate.yaml