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Traefik

Updated on 26 March 2025
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Traefik is an ingress controller and reverse proxy for cloud environments and Kubernetes. It automatically discovers services, provides SSL/TLS termination, and offers advanced routing capabilities. Using Traefik in Kubernetes allows flexible traffic routing to services within the cluster.

Installation

  1. Go to the Kubernetes section and click on the cluster.
  2. Navigate to the Addons tab and select Traefik.
  3. The installation wizard will open. You can upload your own values.yaml file for customization or keep the default settings. Start the installation by clicking the Install button. 
  4. Wait for the installation to complete. After that, make sure all pods in the traefik namespace are running and have the Running status:
kubectl get pods -n traefik

Usage

By default, the installed Traefik configuration uses four entry points:

  • :8000/tcp — HTTP (web)
  • :8443/tcp — HTTPS (websecure)
  • :8080/tcp — API Dashboard (traefik)
  • :9100/tcp — Prometheus Metrics (metrics)

To work with Traefik, you need to create a Service that will route traffic to your application: 

apiVersion: v1
kind: Service
metadata:
  name: example-service
  namespace: default
spec:
  selector:
    app: example-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80

This manifest creates the example-service in the default namespace, which:

  • Routes HTTP traffic (port 80).
  • Directs it to pods with the label app: example-app.
  • Forwards requests to targetPort: 80 within the pods.

Now, you can configure routing through Traefik using IngressRoute:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: example-service-route
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`service.example.com`)
      kind: Rule
      services:
        - name: example-service
          port: 80

In this manifest:

  • entryPoints: web — specifies that routing occurs via HTTP (8000/tcp).
  • match: Host('service.example.com') — defines the routing rule based on the domain name.
  • Requests are directed to the example-service on port 80.

Example Usage

Let's explore an example using Traefik. We will create two Nginx deployments that will work on two different domains — service1.example.com and service2.example.com. We will also configure a load balancer and routing through Traefik. Finally, we will configure SSL certificates using Traefik.

Creating a ConfigMap

First, create the configmap-nginx.yaml file, which defines HTML pages for each service:

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-pages
  namespace: default
data:
  index1.html: |
    <!DOCTYPE html>
    <html>
    <head><title>Service 1</title></head>
    <body><h1>Service 1</h1></body>
    </html>
  index2.html: |
    <!DOCTYPE html>
    <html>
    <head><title>Service 2</title></head>
    <body><h1>Service 2</h1></body>
    </html>

Creating Deployments for Nginx

The service1-nginx.yaml manifest describes the deployment for the first service:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: service1
  namespace: default
  labels:
    app: service1
spec:
  replicas: 2
  selector:
    matchLabels:
      app: service1
  template:
    metadata:
      labels:
        app: service1
    spec:
      containers:
        - name: nginx
          image: nginx
          volumeMounts:
            - name: html-volume
              mountPath: /usr/share/nginx/html
          ports:
            - containerPort: 80
      volumes:
        - name: html-volume
          configMap:
            name: nginx-pages
            items:
              - key: index1.html
                path: index.html

The service2-nginx.yaml manifest describes the deployment for the second service:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: service2
  namespace: default
  labels:
    app: service2
spec:
  replicas: 2
  selector:
    matchLabels:
      app: service2
  template:
    metadata:
      labels:
        app: service2
    spec:
      containers:
        - name: nginx
          image: nginx
          volumeMounts:
            - name: html-volume
              mountPath: /usr/share/nginx/html
          ports:
            - containerPort: 80
      volumes:
        - name: html-volume
          configMap:
            name: nginx-pages
            items:
              - key: index2.html
                path: index.html

Creating Services

Define the services that Traefik will route traffic to. 

The service1-service.yaml manifest: 

apiVersion: v1
kind: Service
metadata:
  name: service1
  namespace: default
spec:
  selector:
    app: service1
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80

This manifest creates the service1 service, which accepts HTTP requests on port 80 and redirects them to pods labeled app: service1. 

The service2-service.yaml manifest:

apiVersion: v1
kind: Service
metadata:
  name: service2
  namespace: default
spec:
  selector:
    app: service2
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80

Creating Routes in Traefik

The service1-ingressroute.yaml manifest describes the route for the first service:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service1-route
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`service1.example.com`)
      kind: Rule
      services:
        - name: service1
          port: 80

This manifest defines an IngressRoute for service1.example.com. Let's break down its components:

  • entryPoints: web — the route is available via HTTP (port 80, specified in the Traefik load balancer).
  • match: Host('service1.example.com') — this route is triggered when accessing service1.example.com.
  • name: service1 — the route forwards traffic to the service1 service.
  • port: 80 — traffic is sent to port 80 inside the service1 Kubernetes service.

The service2-ingressroute.yaml manifest describes the route for the second service:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service2-route
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`service2.example.com`)
      kind: Rule
      services:
        - name: service2
          port: 80

Configuring the Load Balancer

Define the load balancer for Traefik in traefik-loadbalancer.yaml:

apiVersion: v1
kind: Service
metadata:
  name: traefik
  namespace: traefik
spec:
  type: LoadBalancer
  selector:
    app.kubernetes.io/name: traefik
  ports:
    - name: web
      port: 80
      targetPort: 8000
    - name: websecure
      port: 443
      targetPort: 8443

Applying the Configuration

Apply all manifests:

kubectl apply -f ./

After creating the load balancer, set its IP address as the A records for the domains. Now, the services are accessible at:

  • http://service1.example.com
  • http://service2.example.com

We have configured two services in Kubernetes using Traefik, ensuring routing and load balancing.

Configuring SSL

Traefik allows obtaining SSL certificates in two ways:

The choice depends on the cluster configuration. If other Ingress controllers are used, cert-manager is recommended for centralized certificate management. If only Traefik is used in the cluster, you can utilize its built-in certificate retrieval feature.

Updating Traefik Configuration

To enable Let's Encrypt support, modify the Traefik configuration:

  1. Go to the cluster management panel → Addons → select Traefik.
  2. Enable advanced installation mode.
  3. Adjust the configuration:
image:
  registry: docker.io

deployment:
  kind: Deployment

updateStrategy:
  rollingUpdate:
    maxUnavailable: 1
    maxSurge: 0

additionalArguments:
  - "--certificatesresolvers.le.acme.email=admin@example.com"
  - "--certificatesresolvers.le.acme.storage=/data/acme.json"
  - "--certificatesresolvers.le.acme.tlschallenge=true"

Changes made:

    • By default, Traefik is installed as a DaemonSet. In this mode, it cannot obtain certificates using Traefik. Therefore, the deployment type is changed to Deployment.
    • Added the additionalArguments segment. Set your email for Let's Encrypt registration in --certificatesresolvers.le.acme.email.
  1. Save the changes and wait for the update to complete.

Verifying Configuration

After updating, ensure the configuration is correctly applied:

kubectl get pod -n traefik

Then, check for ACME parameters:

kubectl get pod <pod_name> -n traefik -o yaml | grep acme

The output should contain lines like:

 - --certificatesresolvers.le.acme.email=admin@example.com
  - --certificatesresolvers.le.acme.storage=/data/acme.json
  - --certificatesresolvers.le.acme.tlschallenge=true

Automatic Redirect from HTTP to HTTPS

Create a middleware for automatic redirection from HTTP to HTTPS.

redirect-https.yaml: 

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: redirect-to-https
  namespace: default
spec:
  redirectScheme:
    scheme: https
    permanent: true

Apply the manifest:

kubectl apply -f redirect-https.yaml

Updating IngressRoute

Update IngressRoute to add middleware for redirecting HTTP to HTTPS.

The service1-ingressroute.yaml manifest:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service1-route
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`service1.example.com`)
      kind: Rule
      middlewares:
        - name: redirect-to-https
      services:
        - name: service1
          port: 80

The service2-ingressroute.yaml manifest:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service2-route
  namespace: default
spec:
  entryPoints:
    - web
  routes:
    - match: Host(`service2.example.com`)
      kind: Rule
      middlewares:
        - name: redirect-to-https
      services:
        - name: service2
          port: 80

We have added the middleware redirect-to-https to the routing manifests service1-ingressroute.yaml, which automatically redirects HTTP requests to HTTPS.

Update the manifests:

kubectl apply -f service1-ingressroute.yaml
kubectl apply -f service2-ingressroute.yaml

Configuring HTTPS IngressRoute

Now we need to create separate IngressRoute resources for HTTPS since standard HTTP routes do not handle TLS. For HTTPS to work, we need to specify a certResolver, which will use Let's Encrypt to automatically obtain certificates.

In the new IngressRoute, we specify the entryPoints: websecure and the tls parameter, which enables encryption support.

The service1-ingressroute-https.yaml manifest:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service1-route-https
  namespace: default
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`service1.example.com`)
      kind: Rule
      services:
        - name: service1
          port: 80
  tls:
    certResolver: le

The service2-ingressroute-https.yaml manifest:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: service2-route-https
  namespace: default
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`service2.example.com`)
      kind: Rule
      services:
        - name: service2
          port: 80
  tls:
    certResolver: le

Apply the manifests for the new routes:

kubectl apply -f service1-ingressroute-https.yaml
kubectl apply -f service2-ingressroute-https.yaml

Checking Certificate Issuance

Verify certificate issuance with:

kubectl logs -n traefik -l app.kubernetes.io/name=traefik | grep acme

Now, services are accessible via HTTPS:

  • https://service1.example.com
  • https://service2.example.com

We have configured automatic SSL certificate issuance with Let's Encrypt in Traefik, ensuring secure connections to services.

Configuring the Dashboard

Traefik provides a web interface that allows you to monitor the status of routes, services, middleware, and other resources managed by the Traefik instance. The dashboard helps diagnose issues, analyze traffic routing, and manage configuration.

By default, the Traefik dashboard is accessible without authentication, which poses a security risk since any user can view information about running services. To secure access, we will configure basic authentication using middleware.

  1. Generate a password hash:

mkpasswd -m bcrypt "password"

  1. Encode the credentials in base64:

echo -n 'username:generated_hash' | base64

  1. Define a secret in dashboard-secret.yaml:

apiVersion: v1
kind: Secret
metadata:
  name: dashboard-auth-secret
  namespace: traefik
type: Opaque
data:
  users: |
    логин:base64_encoded_password

  1. Apply the manifest:

kubectl apply -f dashboard-secret.yaml

  1. Define middleware in dashboard-auth.yaml:

apiVersion: traefik.io/v1alpha1
kind: Middleware
metadata:
  name: dashboard-auth
  namespace: traefik
spec:
  basicAuth:
    secret: dashboard-auth-secret

  1. Apply the manifest:

kubectl apply -f dashboard-auth.yaml

  1. Finally, define IngressRoute for the dashboard in dashboard-ingress.yaml:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: traefik-dashboard
  namespace: traefik
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`dashboard.example.com`)
      kind: Rule
      middlewares:
        - name: dashboard-auth
      services:
        - kind: TraefikService
          name: api@internal
  tls:
    certResolver: le

This manifest defines a route for accessing the Traefik dashboard via HTTPS, applying basic authentication.

Parameters description:

    • entryPoints: websecure — specifies that the route will only be accessible via HTTPS.
    • match: Host(dashboard.example.com) — directs requests received for dashboard.example.com to the dashboard.
    • middlewares — applies the previously created dashboard-auth middleware, which enables basic HTTP authentication.
    • services — directs requests to the built-in api@internal service, responsible for displaying the dashboard.
    • tls.certResolver: le — enables automatic SSL certificate issuance via Let's Encrypt.

  1. Apply the manifest:

kubectl apply -f dashboard-ingress.yaml

  1. Now, visit https://dashboard.example.com. After authentication, you will see the Traefik dashboard.

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Updated on 26 March 2025
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