Kubernetes basic authentication with Traefik - kubernetes

Question

I am trying to configure Basic Authentication on a Nginx example with Traefik as Ingress controller.
I just create the secret "mypasswd" on the Kubernetes secrets.
This is the Ingress I am using:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nginxingress
annotations:
ingress.kubernetes.io/auth-type: basic
ingress.kubernetes.io/auth-realm: traefik
ingress.kubernetes.io/auth-secret: mypasswd
spec:
rules:
- host: nginx.mycompany.com
http:
paths:
- path: /
backend:
serviceName: nginxservice
servicePort: 80
I check in the Traefik dashboard and it appear, if I access to nginx.mycompany.com I can check the Nginx webpage, but without the basic authentication.
This is my nginx deployment:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 3
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80
Nginx service:
apiVersion: v1
kind: Service
metadata:
labels:
name: nginxservice
name: nginxservice
spec:
ports:
# The port that this service should serve on.
- port: 80
# Label keys and values that must match in order to receive traffic for this service.
selector:
app: nginx
type: ClusterIP

Answer 1

It is popular to use basic authentication. In reference to Kubernetes documentation, you should be able to protect access to Traefik using the following steps :
Create authentication file using htpasswd tool. You'll be asked for a password for the user:
htpasswd -c ./auth
Now use kubectl to create a secret in the monitoring namespace using the file created by htpasswd.
kubectl create secret generic mysecret --from-file auth
--namespace=monitoring
Enable basic authentication by attaching annotations to Ingress object:
ingress.kubernetes.io/auth-type: "basic"
ingress.kubernetes.io/auth-secret: "mysecret"
So, full example config of basic authentication can looks like:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: prometheus-dashboard
namespace: monitoring
annotations:
kubernetes.io/ingress.class: traefik
ingress.kubernetes.io/auth-type: "basic"
ingress.kubernetes.io/auth-secret: "mysecret"
spec:
rules:
- host: dashboard.prometheus.example.com
http:
paths:
- backend:
serviceName: prometheus
servicePort: 9090
You can apply the example as following:
kubectl create -f prometheus-ingress.yaml -n monitoring
This should work without any issues.

Answer 2

Basic Auth configuration for Kubernetes and Traefik 2 seems to have slightly changed. It took me some time to find the solution, that's why I want to share it. I use k3s btw.
Step 1 + 2 are identical to what #d0bry wrote, create the secret:
printf "my-username:`openssl passwd -apr1`\n" >> my-auth
kubectl create secret generic my-auth --from-file my-auth --namespace my-namespace
Step 3 is to create the ingress object and apply a middleware that will handle the authentication
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: my-auth-middleware
namespace: my-namespace
spec:
basicAuth:
removeHeader: true
secret: my-auth
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: my-ingress
namespace: my-namespace
annotations:
kubernetes.io/ingress.class: traefik
traefik.ingress.kubernetes.io/router.middlewares: my-namespace-my-auth-middleware#kubernetescrd
spec:
rules:
- host: my.domain.net
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: my-service
port:
number: 8080
And then of course apply the configuration
kubectl apply -f my-ingress.yaml
refs:
https://doc.traefik.io/traefik/routing/providers/kubernetes-ingress/
https://doc.traefik.io/traefik/middlewares/http/basicauth/

Answer 3

With the latest traefik (verified with 2.7) it got even simpler. Just create a secret of type kubernetes.io/basic-auth and use that in your middleware. No need to create the username:password string first and create a secret from that.
apiVersion: v1
kind: Secret
metadata:
name: my-auth
namespace: my-namespace
type: kubernetes.io/basic-auth
data:
username: <username in base64>
password: <password in base64>
---
apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
name: my-auth-middleware
namespace: my-namespace
spec:
basicAuth:
removeHeader: true
secret: my-auth
Note that the password is not hashed as it is with htpasswd, but only base64 encoded.
Ref docs