Official documentation: https://cert-manager.io/docs/installation/helm/ Install CertManager CustomResourceDefinitions (CRDs): 
kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.2/cert-manager.crds.yaml
Output: 
customresourcedefinition.apiextensions.k8s.io/certificaterequests.cert-manager.io created
customresourcedefinition.apiextensions.k8s.io/certificates.cert-manager.io created
customresourcedefinition.apiextensions.k8s.io/challenges.acme.cert-manager.io created
customresourcedefinition.apiextensions.k8s.io/clusterissuers.cert-manager.io created
customresourcedefinition.apiextensions.k8s.io/issuers.cert-manager.io created
customresourcedefinition.apiextensions.k8s.io/orders.acme.cert-manager.io created
Install Cert Manager: 
kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.2/cert-manager.yaml
Output: 
namespace/cert-manager created
customresourcedefinition.apiextensions.k8s.io/certificaterequests.cert-manager.io unchanged
customresourcedefinition.apiextensions.k8s.io/certificates.cert-manager.io unchanged
customresourcedefinition.apiextensions.k8s.io/challenges.acme.cert-manager.io unchanged
customresourcedefinition.apiextensions.k8s.io/clusterissuers.cert-manager.io unchanged
customresourcedefinition.apiextensions.k8s.io/issuers.cert-manager.io unchanged
customresourcedefinition.apiextensions.k8s.io/orders.acme.cert-manager.io unchanged
serviceaccount/cert-manager-cainjector created
serviceaccount/cert-manager created
serviceaccount/cert-manager-webhook created
clusterrole.rbac.authorization.k8s.io/cert-manager-cainjector created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-issuers created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-clusterissuers created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-certificates created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-orders created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-challenges created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-ingress-shim created
clusterrole.rbac.authorization.k8s.io/cert-manager-cluster-view created
clusterrole.rbac.authorization.k8s.io/cert-manager-view created
clusterrole.rbac.authorization.k8s.io/cert-manager-edit created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-approve:cert-manager-io created
clusterrole.rbac.authorization.k8s.io/cert-manager-controller-certificatesigningrequests created
clusterrole.rbac.authorization.k8s.io/cert-manager-webhook:subjectaccessreviews created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-cainjector created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-issuers created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-clusterissuers created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-certificates created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-orders created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-challenges created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-ingress-shim created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-approve:cert-manager-io created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-controller-certificatesigningrequests created
clusterrolebinding.rbac.authorization.k8s.io/cert-manager-webhook:subjectaccessreviews created
role.rbac.authorization.k8s.io/cert-manager-cainjector:leaderelection created
role.rbac.authorization.k8s.io/cert-manager:leaderelection created
role.rbac.authorization.k8s.io/cert-manager-webhook:dynamic-serving created
rolebinding.rbac.authorization.k8s.io/cert-manager-cainjector:leaderelection created
rolebinding.rbac.authorization.k8s.io/cert-manager:leaderelection created
rolebinding.rbac.authorization.k8s.io/cert-manager-webhook:dynamic-serving created
service/cert-manager created
service/cert-manager-webhook created
deployment.apps/cert-manager-cainjector created
deployment.apps/cert-manager created
deployment.apps/cert-manager-webhook created
mutatingwebhookconfiguration.admissionregistration.k8s.io/cert-manager-webhook created
validatingwebhookconfiguration.admissionregistration.k8s.io/cert-manager-webhook created

​
Issuer

Create Issuer.yaml: 
apiVersion: cert-manager.io/v1
kind: Issuer
metadata:
  name: [issuer name]
spec:
  acme:
    # The ACME server URL
    server: https://acme-v02.api.letsencrypt.org/directory
    # Email address used for ACME registration
    email: [email]
    # Name of a secret used to store the ACME account private key
    privateKeySecretRef:
      name: [privateKeySecretRef]
    # Enable the HTTP-01 challenge provider
    solvers:
      - http01:
          ingress:
            ingressClassName: nginx
Fill the following fields:
  • name: - issuer name
  • email: - email is required by Let’s Encrypt and used to notify you of certificate expiration and updates
  • privateKeySecretRef: - name of the secret
Install issuer: 
kubectl apply -f issuer.yaml
Check: 
$ kubectl describe issuers.cert-manager.io
Name:         [name]
Namespace:    default
Labels:       <none>
Annotations:  <none>
API Version:  cert-manager.io/v1
Kind:         Issuer
Metadata:
  Creation Timestamp:  2024-02-14T23:32:58Z
  Generation:          1
  Resource Version:    1479945
  UID:                 c023b6a1-789f-44c8-8a30-d7ecace38acc
Spec:
  Acme:
    Email:  ak@neterial.io
    Private Key Secret Ref:
      Name:  [name]
    Server:  https://acme-v02.api.letsencrypt.org/directory
    Solvers:
      http01:
        Ingress:
          Ingress Class Name:  nginx
Status:
  Acme:
    Last Private Key Hash:  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=
    Last Registered Email:  [email]
    Uri:                    https://acme-v02.api.letsencrypt.org/acme/acct/1570600057
  Conditions:
    Last Transition Time:  2024-02-14T23:32:58Z
    Message:               The ACME account was registered with the ACME server
    Observed Generation:   1
    Reason:                ACMEAccountRegistered
    Status:                True
    Type:                  Ready
Events:                    <none>