haproxy-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: service-loadbalancer
  labels:
    app: service-loadbalancer
    version: v1
spec:
  replicas: 1
  selector:
    app: service-loadbalancer
    version: v1
  template:
    metadata:
      labels:
        app: service-loadbalancer
        version: v1
    spec:
      containers:
      - image: aledbf/servicelb:0.2
        imagePullPolicy: Always
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8081
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        name: haproxy
        ports:
        # All http services
        - containerPort: 80
          hostPort: 80
          protocol: TCP
        # haproxy stats
        - containerPort: 1936
          hostPort: 1936
          protocol: TCP

single-host.md

If you already have a running cluster skip next step (please change the IP address used in the commands)

From 0 to k8s -> https://coreos.com/kubernetes/docs/latest/kubernetes-on-vagrant-single.html

kubectl run example-go --image=deis/example-go --replicas=1 --port=8080
kubectl expose rc example-go --port=8080
kubectl scale --replicas=3 replicationcontrollers example-go

kubectl annotate svc example-go "serviceloadbalancer/lb.host=www.k8s.io"

wget https://gist.githubusercontent.com/aledbf/2985931789f3c182f22b/raw/53ff53f49a598fd7ee67e5a6cc0d12526313c2fe/haproxy-rc.yaml

kubectl create -f haproxy-rc.yaml

(wait)

kubectl describe pods -l app=service-loadbalancer

#Routing using the service name:

http://172.17.4.99/example-go:8080

#Routing using Host header:

kubectl annotate svc example-go "serviceloadbalancer/lb.host=www.k8s.io"

curl -v 172.17.4.99 -H "Host: www.k8s.io"

##Session Affinity:

• sticky tables

If non-empty, set the session affinity for the service to this; legal values: 'None', 'ClientIP'

kubectl expose example-go --session-affinity="ClusterIP"

if the service already exists

kubectl patch svc example-go -p '{"spec":{"sessionAffinity":"ClientIP"}}'

• cookies

kubectl expose example-go --session-affinity="ClientIP"
kubectl annotate svc example-go "serviceloadbalancer/lb.cookie-sticky-session=true"

if the service already exists

kubectl patch svc example-go -p '{"spec":{"sessionAffinity":"ClientIP"}}'
kubectl annotate svc example-go "serviceloadbalancer/lb.cookie-sticky-session=true"

Multiple namespaces

• --namespace different namespace than "default"
• --all-namespaces all available namespaces

kubectl 1.1.0 is required (because of the annotate command)