SSL Certificates on Kubernetes Using ACME - ssl

Question

I have been following this tutorial: https://cert-manager.io/docs/ , and after I have installed my cert manager and made sure they are running with kubectl get pods --namespace cert-manager,
cert-manager-5597cff495-l5hjs 1/1 Running 0 91m
cert-manager-cainjector-bd5f9c764-xrb2t 1/1 Running 0 91m
cert-manager-webhook-5f57f59fbc-q5rqs 1/1 Running 0 91m
I then configured my cert-manager using ACME issuer by following this tutorial https://cert-manager.io/docs/configuration/acme/ .
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-staging
spec:
acme:
# You must replace this email address with your own.
# Let's Encrypt will use this to contact you about expiring
# certificates, and issues related to your account.
email: aidenhsy#gmail.com
server: https://acme-staging-v02.api.letsencrypt.org/directory
privateKeySecretRef:
# Secret resource that will be used to store the account's private key.
name: letsencrypt-staging
# Add a single challenge solver, HTTP01 using nginx
solvers:
- http01:
ingress:
class: nginx
Here is my full ingress config file:
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: ingress-srv
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/use-regex: 'true'
spec:
rules:
- host: www.hyhaus.xyz
http:
paths:
- path: /api/?(.*)
backend:
serviceName: devback-srv
servicePort: 4000
- path: /?(.*)
backend:
serviceName: devfront-srv
servicePort: 3000
---
apiVersion: v1
kind: Service
metadata:
annotations:
service.beta.kubernetes.io/do-loadbalancer-enable-proxy-protocol: 'true'
service.beta.kubernetes.io/do-loadbalancer-hostname: 'www.hyhaus.xyz'
labels:
helm.sh/chart: ingress-nginx-2.0.3
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/version: 0.32.0
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/component: controller
name: ingress-nginx-controller
namespace: ingress-nginx
spec:
type: LoadBalancer
externalTrafficPolicy: Local
ports:
- name: http
port: 80
protocol: TCP
targetPort: http
- name: https
port: 443
protocol: TCP
targetPort: https
selector:
app.kubernetes.io/name: ingress-nginx
app.kubernetes.io/instance: ingress-nginx
app.kubernetes.io/component: controller
---
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-staging
spec:
acme:
# You must replace this email address with your own.
# Let's Encrypt will use this to contact you about expiring
# certificates, and issues related to your account.
email: aidenhsy#gmail.com
server: https://acme-staging-v02.api.letsencrypt.org/directory
privateKeySecretRef:
# Secret resource that will be used to store the account's private key.
name: letsencrypt-staging
# Add a single challenge solver, HTTP01 using nginx
solvers:
- http01:
ingress:
class: nginx
However when I browse to my site, the browser warns: security certificate is not trusted by your computer's operating system. And when I took a look a my certificate, it shows self-assigned, which is not really what I want. Am I doing something wrong here?

Answer 1

This is a certificate placeholder provided by nginx ingress controller. When you see it, it means there is no other (dedicated) certificate for the endpoint.
Now the first reason why this happened is that your Ingress doesn't have necessary data. Update it with this:
metadata:
annotations:
# which issuer to use
cert-manager.io/cluster-issuer: "letsencrypt-staging"
spec:
tls: # placing a host in TLS config indicates that a certificate should be created
- hosts:
- example.org
- www.example.org
- xyz.example.org
secretName: myingress-cert # cert-manager will store the created certificate in this secret
Documentation for ingress objects is here.
If the above didn't help, try the troubleshooting steps offered by the documentation. In my experience checking CertificateRequest and Certificate resources was enough in most cases to determine the problem.
$ kubectl get certificate
$ kubectl describe certificate <certificate-name>
$ kubectl get certificaterequest
$ kubectl describe certificaterequest <CertificateRequest name>
Remember that these objects are namespaced, meaning that they'll be in the same namespace as the ingress object.

Answer 2

To secure Ingress, First you have to add ClusterIssuer to your Ingress resources and cert-manager will then pick it up and create the Certificate resource for you .
Kind : ingress metadata: annotations : cert-manager.io/cluster-issuer: nameOfClusterIssuer .
Second you have to add tls <= this indicates the creation of certificate(key/cert pair) by Cert-manager via The ClusterIssuer.
Third you have to add secretName: myingress <= here the cert manager will store the tls secrets ( after creating key/cert pair and store them for you)..