Kubernetes user-guide
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docs/user-guide/kubernetes.md
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# Kubernetes Ingress Controller
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This guide explains how to use Træfɪk as an Ingress controller in a Kubernetes cluster.
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If you are not familiar with Ingresses in Kubernetes you might want to read the [Kubernetes user guide](http://kubernetes.io/docs/user-guide/ingress/)
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The config files used in this guide can be found in the [examples directory](https://github.com/containous/traefik/tree/master/examples/k8s)
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## Prerequisites
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1. A working Kubernetes cluster. If you want to follow along with this guide, you should setup [minikube](http://kubernetes.io/docs/getting-started-guides/minikube/)
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on your machine, as it is the quickest way to get a local Kubernetes cluster setup for experimentation and development.
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2. The `kubectl` binary should be [installed on your workstation](http://kubernetes.io/docs/getting-started-guides/minikube/#download-kubectl).
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## Deploy Træfɪk
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We are going to deploy Træfɪk with a
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[Deployment](http://kubernetes.io/docs/user-guide/deployments/), as this will
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allow you to easily roll out config changes or update the image.
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```yaml
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apiVersion: v1
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kind: Deployment
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apiVersion: extensions/v1beta1
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metadata:
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name: traefik-ingress-controller
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namespace: kube-system
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labels:
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k8s-app: traefik-ingress-lb
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spec:
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replicas: 1
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selector:
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matchLabels:
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k8s-app: traefik-ingress-lb
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template:
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metadata:
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labels:
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k8s-app: traefik-ingress-lb
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name: traefik-ingress-lb
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version: v1.0.0
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spec:
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terminationGracePeriodSeconds: 60
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containers:
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- image: traefik:v1.0.0
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name: traefik-ingress-lb
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resources:
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limits:
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cpu: 200m
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memory: 30Mi
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requests:
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cpu: 100m
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memory: 20Mi
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ports:
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- containerPort: 80
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hostPort: 80
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- containerPort: 8080
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args:
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- --web
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- --kubernetes
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```
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[examples/k8s/traefik.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/traefik.yaml)
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> notice that we binding port 80 on the Træfɪk container to port 80 on the host.
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> With a multi node cluster we might expose Træfɪk with a NodePort or LoadBalancer service
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> and run more than 1 replica of Træfɪk for high availability.
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To deploy Træfɪk to your cluster start by submitting the deployment to the cluster with `kubectl`:
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```sh
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kubectl apply -f examples/k8s/traefik.yaml
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```
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### Check the deployment
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Now lets check if our deployment was successful.
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Start by listing the pods in the `kube-system` namespace:
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```sh
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$kubectl --namespace=kube-system get pods
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NAME READY STATUS RESTARTS AGE
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kube-addon-manager-minikubevm 1/1 Running 0 4h
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kubernetes-dashboard-s8krj 1/1 Running 0 4h
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traefik-ingress-controller-678226159-eqseo 1/1 Running 0 7m
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```
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You should see that after submitting the Deployment to Kubernetes it has launched
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a pod, and it is now running. _It might take a few moments for kubenetes to pull
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the Træfɪk image and start the container._
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> You could also check the deployment with the Kubernetes dashboard, run
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> `minikube dashboard` to open it in your browser, then choose the `kube-system`
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> namespace from the menu at the top right of the screen.
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You should now be able to access Træfɪk on port 80 of your minikube instance.
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```sh
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curl $(minikube ip)
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404 page not found
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```
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> We expect to see a 404 response here as we haven't yet given Træfɪk any configuration.
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## Submitting An Ingress to the cluster.
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Lets start by creating a Service and an Ingress that will expose the
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[Træfɪk Web UI](https://github.com/containous/traefik#web-ui).
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: traefik-web-ui
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namespace: kube-system
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spec:
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selector:
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k8s-app: traefik-ingress-lb
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ports:
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- port: 80
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targetPort: 8080
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---
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: traefik-web-ui
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namespace: kube-system
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spec:
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rules:
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- host: traefik-ui.local
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http:
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paths:
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- backend:
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serviceName: traefik-web-ui
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servicePort: 80
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```
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[examples/k8s/ui.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/ui.yaml)
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```sh
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kubectl apply -f examples/k8s/ui.yaml
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```
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Now lets setup an entry in our /etc/hosts file to route `traefik-ui.local`
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to our cluster.
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> In production you would want to set up real dns entries.
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> You can get the ip address of your minikube instance by running `minikube ip`
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```
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echo "$(minikube ip) traefik-ui.local" | sudo tee -a /etc/hosts
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```
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We should now be able to visit [traefik-ui.local](http://traefik-ui.local) in the browser and view the Træfɪk Web UI.
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## Name based routing
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In this example we are going to setup websites for 3 of the United Kingdoms
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best loved cheeses, Cheddar, Stilton and Wensleydale.
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First lets start by launching the 3 pods for the cheese websites.
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```yaml
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---
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kind: Deployment
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apiVersion: extensions/v1beta1
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metadata:
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name: stilton
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labels:
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app: cheese
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cheese: stilton
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: cheese
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task: stilton
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template:
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metadata:
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labels:
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app: cheese
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task: stilton
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version: v0.0.1
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spec:
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containers:
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- name: cheese
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image: errm/cheese:stilton
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resources:
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requests:
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cpu: 100m
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memory: 50Mi
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limits:
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cpu: 100m
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memory: 50Mi
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ports:
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- containerPort: 80
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---
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kind: Deployment
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apiVersion: extensions/v1beta1
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metadata:
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name: cheddar
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labels:
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app: cheese
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cheese: cheddar
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: cheese
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task: cheddar
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template:
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metadata:
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labels:
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app: cheese
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task: cheddar
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version: v0.0.1
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spec:
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containers:
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- name: cheese
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image: errm/cheese:cheddar
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resources:
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requests:
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cpu: 100m
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memory: 50Mi
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limits:
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cpu: 100m
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memory: 50Mi
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ports:
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- containerPort: 80
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---
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kind: Deployment
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apiVersion: extensions/v1beta1
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metadata:
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name: wensleydale
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labels:
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app: cheese
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cheese: wensleydale
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: cheese
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task: wensleydale
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template:
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metadata:
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labels:
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app: cheese
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task: wensleydale
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version: v0.0.1
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spec:
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containers:
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- name: cheese
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image: errm/cheese:wensleydale
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resources:
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requests:
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cpu: 100m
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memory: 50Mi
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limits:
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cpu: 100m
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memory: 50Mi
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ports:
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- containerPort: 80
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```
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[examples/k8s/cheese-deployments.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/cheese-deployments.yaml)
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```sh
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kubectl apply -f examples/k8s/cheese-deployments.yaml
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```
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Next we need to setup a service for each of the cheese pods.
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```yaml
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: stilton
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spec:
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ports:
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- name: http
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targetPort: 80
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port: 80
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selector:
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app: cheese
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task: stilton
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: cheddar
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spec:
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ports:
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- name: http
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targetPort: 80
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port: 80
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selector:
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app: cheese
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task: cheddar
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: wensleydale
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spec:
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ports:
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- name: http
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targetPort: 80
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port: 80
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selector:
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app: cheese
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task: wensleydale
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```
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[examples/k8s/cheese-services.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/cheese-services.yaml)
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```sh
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kubectl apply -f examples/k8s/cheese-services.yaml
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```
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Now we can submit an ingress for the cheese websites.
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```yaml
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: cheese
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spec:
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rules:
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- host: stilton.local
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http:
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paths:
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- path: /
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backend:
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serviceName: stilton
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servicePort: http
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- host: cheddar.local
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http:
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paths:
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- path: /
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backend:
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serviceName: cheddar
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servicePort: http
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- host: wensleydale.local
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http:
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paths:
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- path: /
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backend:
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serviceName: wensleydale
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servicePort: http
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```
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[examples/k8s/cheese-ingress.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/cheese-ingress.yaml)
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> Notice that we list each hostname, and add a backend service.
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||||||
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```sh
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kubectl apply -f examples/k8s/cheese-ingress.yaml
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```
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Now visit the [Træfɪk dashboard](http://traefik-ui.local/) and you should
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see a frontend for each host. Along with a backend listing for each service
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with a Server set up for each pod.
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If you edit your `/etc/hosts` again you should be able to access the cheese
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websites in your browser.
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```sh
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echo "$(minikube ip) stilton.local cheddar.local wensleydale.local" | sudo tee -a /etc/hosts
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```
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* [Stilton](http://stilton.local/)
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* [Cheddar](http://cheddar.local/)
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* [Wensleydale](http://wensleydale.local/)
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## Path based routing
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Now lets suppose that our fictional client has decided that while they are
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super happy about our cheesy web design, when they asked for 3 websites
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they had not really bargained on having to buy 3 domain names.
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No problem, we say, why don't we reconfigure the sites to host all 3 under one domain.
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```yaml
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apiVersion: extensions/v1beta1
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kind: Ingress
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metadata:
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name: cheeses
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annotations:
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traefik.frontend.rule.type: pathprefixstrip
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spec:
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rules:
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- host: cheeses.local
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http:
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paths:
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- path: /stilton
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backend:
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serviceName: stilton
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servicePort: http
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- path: /cheddar
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backend:
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serviceName: cheddar
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servicePort: http
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- path: /wensleydale
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backend:
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||||||
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serviceName: wensleydale
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||||||
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servicePort: http
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||||||
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```
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||||||
|
[examples/k8s/cheeses-ingress.yaml](https://github.com/containous/traefik/tree/master/examples/k8s/cheeses-ingress.yaml)
|
||||||
|
|
||||||
|
> Notice that we are configuring Træfɪk to strip the prefix from the url path
|
||||||
|
> with the `traefik.frontend.rule.type` annotation so that we can use
|
||||||
|
> the containers from the previous example without modification.
|
||||||
|
|
||||||
|
```sh
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||||||
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kubectl apply -f examples/k8s/cheeses-ingress.yaml
|
||||||
|
```
|
||||||
|
|
||||||
|
```sh
|
||||||
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echo "$(minikube ip) cheeses.local" | sudo tee -a /etc/hosts
|
||||||
|
```
|
||||||
|
|
||||||
|
You should now be able to visit the websites in your browser.
|
||||||
|
|
||||||
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* [cheeses.local/stilton](http://cheeses.local/stilton/)
|
||||||
|
* [cheeses.local/cheddar](http://cheeses.local/cheddar/)
|
||||||
|
* [cheeses.local/wensleydale](http://cheeses.local/wensleydale/)
|
||||||
99
examples/k8s/cheese-deployments.yaml
Normal file
99
examples/k8s/cheese-deployments.yaml
Normal file
|
|
@ -0,0 +1,99 @@
|
||||||
|
---
|
||||||
|
kind: Deployment
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
metadata:
|
||||||
|
name: stilton
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
cheese: stilton
|
||||||
|
spec:
|
||||||
|
replicas: 2
|
||||||
|
selector:
|
||||||
|
matchLabels:
|
||||||
|
app: cheese
|
||||||
|
task: stilton
|
||||||
|
template:
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
task: stilton
|
||||||
|
version: v0.0.1
|
||||||
|
spec:
|
||||||
|
containers:
|
||||||
|
- name: cheese
|
||||||
|
image: errm/cheese:stilton
|
||||||
|
resources:
|
||||||
|
requests:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
limits:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
ports:
|
||||||
|
- containerPort: 80
|
||||||
|
---
|
||||||
|
kind: Deployment
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
metadata:
|
||||||
|
name: cheddar
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
cheese: cheddar
|
||||||
|
spec:
|
||||||
|
replicas: 2
|
||||||
|
selector:
|
||||||
|
matchLabels:
|
||||||
|
app: cheese
|
||||||
|
task: cheddar
|
||||||
|
template:
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
task: cheddar
|
||||||
|
version: v0.0.1
|
||||||
|
spec:
|
||||||
|
containers:
|
||||||
|
- name: cheese
|
||||||
|
image: errm/cheese:cheddar
|
||||||
|
resources:
|
||||||
|
requests:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
limits:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
ports:
|
||||||
|
- containerPort: 80
|
||||||
|
---
|
||||||
|
kind: Deployment
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
metadata:
|
||||||
|
name: wensleydale
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
cheese: wensleydale
|
||||||
|
spec:
|
||||||
|
replicas: 2
|
||||||
|
selector:
|
||||||
|
matchLabels:
|
||||||
|
app: cheese
|
||||||
|
task: wensleydale
|
||||||
|
template:
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
app: cheese
|
||||||
|
task: wensleydale
|
||||||
|
version: v0.0.1
|
||||||
|
spec:
|
||||||
|
containers:
|
||||||
|
- name: cheese
|
||||||
|
image: errm/cheese:wensleydale
|
||||||
|
resources:
|
||||||
|
requests:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
limits:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 50Mi
|
||||||
|
ports:
|
||||||
|
- containerPort: 80
|
||||||
27
examples/k8s/cheese-ingress.yaml
Normal file
27
examples/k8s/cheese-ingress.yaml
Normal file
|
|
@ -0,0 +1,27 @@
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
kind: Ingress
|
||||||
|
metadata:
|
||||||
|
name: cheese
|
||||||
|
spec:
|
||||||
|
rules:
|
||||||
|
- host: stilton.local
|
||||||
|
http:
|
||||||
|
paths:
|
||||||
|
- path: /
|
||||||
|
backend:
|
||||||
|
serviceName: stilton
|
||||||
|
servicePort: http
|
||||||
|
- host: cheddar.local
|
||||||
|
http:
|
||||||
|
paths:
|
||||||
|
- path: /
|
||||||
|
backend:
|
||||||
|
serviceName: cheddar
|
||||||
|
servicePort: http
|
||||||
|
- host: wensleydale.local
|
||||||
|
http:
|
||||||
|
paths:
|
||||||
|
- path: /
|
||||||
|
backend:
|
||||||
|
serviceName: wensleydale
|
||||||
|
servicePort: http
|
||||||
39
examples/k8s/cheese-services.yaml
Normal file
39
examples/k8s/cheese-services.yaml
Normal file
|
|
@ -0,0 +1,39 @@
|
||||||
|
---
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
name: stilton
|
||||||
|
spec:
|
||||||
|
ports:
|
||||||
|
- name: http
|
||||||
|
targetPort: 80
|
||||||
|
port: 80
|
||||||
|
selector:
|
||||||
|
app: cheese
|
||||||
|
task: stilton
|
||||||
|
---
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
name: cheddar
|
||||||
|
spec:
|
||||||
|
ports:
|
||||||
|
- name: http
|
||||||
|
targetPort: 80
|
||||||
|
port: 80
|
||||||
|
selector:
|
||||||
|
app: cheese
|
||||||
|
task: cheddar
|
||||||
|
---
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
name: wensleydale
|
||||||
|
spec:
|
||||||
|
ports:
|
||||||
|
- name: http
|
||||||
|
targetPort: 80
|
||||||
|
port: 80
|
||||||
|
selector:
|
||||||
|
app: cheese
|
||||||
|
task: wensleydale
|
||||||
23
examples/k8s/cheeses-ingress.yaml
Normal file
23
examples/k8s/cheeses-ingress.yaml
Normal file
|
|
@ -0,0 +1,23 @@
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
kind: Ingress
|
||||||
|
metadata:
|
||||||
|
name: cheeses
|
||||||
|
annotations:
|
||||||
|
traefik.frontend.rule.type: pathprefixstrip
|
||||||
|
spec:
|
||||||
|
rules:
|
||||||
|
- host: cheeses.local
|
||||||
|
http:
|
||||||
|
paths:
|
||||||
|
- path: /stilton
|
||||||
|
backend:
|
||||||
|
serviceName: stilton
|
||||||
|
servicePort: http
|
||||||
|
- path: /cheddar
|
||||||
|
backend:
|
||||||
|
serviceName: cheddar
|
||||||
|
servicePort: http
|
||||||
|
- path: /wensleydale
|
||||||
|
backend:
|
||||||
|
serviceName: wensleydale
|
||||||
|
servicePort: http
|
||||||
40
examples/k8s/traefik.yaml
Normal file
40
examples/k8s/traefik.yaml
Normal file
|
|
@ -0,0 +1,40 @@
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Deployment
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
metadata:
|
||||||
|
name: traefik-ingress-controller
|
||||||
|
namespace: kube-system
|
||||||
|
labels:
|
||||||
|
k8s-app: traefik-ingress-lb
|
||||||
|
spec:
|
||||||
|
replicas: 1
|
||||||
|
selector:
|
||||||
|
matchLabels:
|
||||||
|
k8s-app: traefik-ingress-lb
|
||||||
|
template:
|
||||||
|
metadata:
|
||||||
|
labels:
|
||||||
|
k8s-app: traefik-ingress-lb
|
||||||
|
name: traefik-ingress-lb
|
||||||
|
version: v1.0.0
|
||||||
|
spec:
|
||||||
|
terminationGracePeriodSeconds: 60
|
||||||
|
containers:
|
||||||
|
- image: traefik:v1.0.0
|
||||||
|
name: traefik-ingress-lb
|
||||||
|
resources:
|
||||||
|
limits:
|
||||||
|
cpu: 200m
|
||||||
|
memory: 30Mi
|
||||||
|
requests:
|
||||||
|
cpu: 100m
|
||||||
|
memory: 20Mi
|
||||||
|
ports:
|
||||||
|
- name: http
|
||||||
|
containerPort: 80
|
||||||
|
hostPort: 80
|
||||||
|
- name: admin
|
||||||
|
containerPort: 8080
|
||||||
|
args:
|
||||||
|
- --web
|
||||||
|
- --kubernetes
|
||||||
28
examples/k8s/ui.yaml
Normal file
28
examples/k8s/ui.yaml
Normal file
|
|
@ -0,0 +1,28 @@
|
||||||
|
---
|
||||||
|
apiVersion: v1
|
||||||
|
kind: Service
|
||||||
|
metadata:
|
||||||
|
name: traefik-web-ui
|
||||||
|
namespace: kube-system
|
||||||
|
spec:
|
||||||
|
selector:
|
||||||
|
k8s-app: traefik-ingress-lb
|
||||||
|
ports:
|
||||||
|
- name: web
|
||||||
|
port: 80
|
||||||
|
targetPort: 8080
|
||||||
|
---
|
||||||
|
apiVersion: extensions/v1beta1
|
||||||
|
kind: Ingress
|
||||||
|
metadata:
|
||||||
|
name: traefik-web-ui
|
||||||
|
namespace: kube-system
|
||||||
|
spec:
|
||||||
|
rules:
|
||||||
|
- host: traefik-ui.local
|
||||||
|
http:
|
||||||
|
paths:
|
||||||
|
- path: /
|
||||||
|
backend:
|
||||||
|
serviceName: traefik-web-ui
|
||||||
|
servicePort: web
|
||||||
|
|
@ -16,7 +16,7 @@ theme: united
|
||||||
site_favicon: 'img/traefik.icon.png'
|
site_favicon: 'img/traefik.icon.png'
|
||||||
|
|
||||||
# Copyright
|
# Copyright
|
||||||
copyright: Copyright (c) 2016 Containous SAS
|
copyright: "Copyright © 2016 Containous SAS"
|
||||||
|
|
||||||
# Options
|
# Options
|
||||||
extra:
|
extra:
|
||||||
|
|
@ -49,4 +49,5 @@ pages:
|
||||||
- User Guide:
|
- User Guide:
|
||||||
- 'Configuration examples': 'user-guide/examples.md'
|
- 'Configuration examples': 'user-guide/examples.md'
|
||||||
- 'Swarm cluster': 'user-guide/swarm.md'
|
- 'Swarm cluster': 'user-guide/swarm.md'
|
||||||
|
- 'Kubernetes': 'user-guide/kubernetes.md'
|
||||||
- Benchmarks: benchmarks.md
|
- Benchmarks: benchmarks.md
|
||||||
Loading…
Reference in a new issue