Examples

Prerequisites

Before following those examples, make sure your cluster follows .

Deploy those two yaml files on your Kubernetes cluster in order to add a simple backend example, available through HTTP and TCP.

namespace.yaml

deployment.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
  name: whoami
  namespace: whoami
spec:
  replicas: 2
  selector:
    matchLabels:
      app: whoami
  template:
    metadata:
      labels:
        app: whoami
    spec:
      serviceAccount: whoami-server
      containers:
        - name: whoami
          image: traefik/whoami:v1.6.0
          imagePullPolicy: IfNotPresent
---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: whoami-tcp
  namespace: whoami
spec:
  replicas: 2
  selector:
    matchLabels:
      app: whoami-tcp
  template:
    metadata:
      labels:
        app: whoami-tcp
    spec:
      serviceAccount: whoami-server
      containers:
        - name: whoami-tcp
          image: traefik/whoamitcp:v0.1.0
          imagePullPolicy: IfNotPresent
---
apiVersion: v1
kind: Service
metadata:
  name: whoami
  namespace: whoami
  labels:
    app: whoami
spec:
  type: ClusterIP
  ports:
    - port: 80
      name: whoami
  selector:
    app: whoami
---
apiVersion: v1
kind: Service
metadata:
  name: whoami-tcp
  namespace: whoami
  labels:
    app: whoami-tcp
spec:
  ports:
    - port: 8080
      name: whoami-tcp
  selector:
    app: whoami-tcp
---
kind: Pod
metadata:
  name: whoami-client
  namespace: whoami
spec:
  serviceAccountName: whoami-client
  containers:
    - name: whoami-client
      image: giantswarm/tiny-tools:3.9
      command:
        - "sleep"
        - "3600"

You should now see the following when running kubectl get all -n whoami:

NAME                             READY   STATUS    RESTARTS   AGE
pod/whoami-client                1/1     Running   0          11s
pod/whoami-f4cbd7f9c-lddgq       1/1     Running   0          12s
pod/whoami-f4cbd7f9c-zk4rb       1/1     Running   0          12s
pod/whoami-tcp-7679bc465-ldlt2   1/1     Running   0          12s
pod/whoami-tcp-7679bc465-wf87n   1/1     Running   0          12s
NAME                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
service/whoami       ClusterIP   100.68.109.244   <none>        80/TCP     13s
service/whoami-tcp   ClusterIP   100.68.73.211    <none>        8080/TCP   13s
NAME                         DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/whoami       2         2         2            2           13s
deployment.apps/whoami-tcp   2         2         2            2           13s
NAME                                   DESIRED   CURRENT   READY   AGE
replicaset.apps/whoami-f4cbd7f9c       2         2         2       13s
replicaset.apps/whoami-tcp-7679bc465   2         2         2       13s

Command

kubectl -n whoami exec whoami-client -- curl -s whoami.whoami.svc.cluster.local

Expected Output

And through TCP, by executing the following netcat command and sending some data.

Command

kubectl -n whoami exec -ti whoami-client -- nc whoami-tcp.whoami.svc.cluster.local 8080
my data

Expected Output

Received: my data

You can now install Traefik Mesh by following this documentation on your cluster.

Now, in order to configure Traefik Mesh for your whoami service, you just need to update the whoami service specs, in order to add the appropriate annotations.

The HTTP service needs to have mesh.traefik.io/traffic-type: "http" and the TCP service, mesh.traefik.io/traffic-type: "tcp".

---
apiVersion: v1
kind: Service
metadata:
  name: whoami
  namespace: whoami
  labels:
    app: whoami
  annotations:
    mesh.traefik.io/traffic-type: "http"
    mesh.traefik.io/retry-attempts: "2"
spec:
  type: ClusterIP
  ports:
    - port: 80
      name: whoami
  selector:
    app: whoami
---
apiVersion: v1
kind: Service
metadata:
  name: whoami-tcp
  namespace: whoami
  labels:
    app: whoami-tcp
  annotations:
    mesh.traefik.io/traffic-type: "tcp"
  type: ClusterIP
  ports:
    - port: 8080
      name: whoami-tcp
    app: whoami-tcp

You should now be able to access your HTTP and TCP services through the Traefik Mesh endpoint:

Command

Expected Output

Hostname: whoami-84bdf87956-gvbm8
IP: 127.0.0.1
IP: 5.6.7.8
RemoteAddr: 1.2.3.4:12345
GET / HTTP/1.1
Host: whoami.whoami.traefik.mesh
User-Agent: curl/7.64.0
Accept: */*
X-Forwarded-For: 3.4.5.6

ACL Example

The can be enabled when installing Traefik Mesh. Once activated, all traffic is forbidden unless explicitly authorized using the SMI TrafficTarget resource. This example will present the configuration required to allow the client pod to send traffic to the HTTP and TCP services defined in the previous example.

---
apiVersion: specs.smi-spec.io/v1alpha3
kind: HTTPRouteGroup
metadata:
  name: http-everything
  namespace: whoami
spec:
  matches:
    - name: everything
      pathRegex: ".*"
      methods: ["*"]
---
kind: TrafficTarget
apiVersion: access.smi-spec.io/v1alpha2
metadata:
  name: whatever
  namespace: whoami
spec:
  destination:
    kind: ServiceAccount
    name: whoami-server
    namespace: whoami
    port: 80
  rules:
    - kind: HTTPRouteGroup
      name: http-everything
      matches:
        - everything
  sources:
    - kind: ServiceAccount
      name: whoami-client
      namespace: whoami

Incoming traffic on a TCP service can also be authorized using a TrafficTarget and a TCPRoute.

---
kind: TrafficTarget
apiVersion: access.smi-spec.io/v1alpha2
metadata:
  name: api-service-target
  namespace: default
spec:
  destination:
    kind: ServiceAccount
    name: api-service
    namespace: default
  rules:
    - kind: TCPRoute
      name: my-tcp-route
  sources:
    - kind: ServiceAccount
      name: my-other-service
      namespace: default
---
apiVersion: specs.smi-spec.io/v1alpha3
kind: TCPRoute
metadata:
spec: {}