kubernetes-http-loadbalancer's Introduction

kubernetes-http-loadbalancer

a complete working example of a HTTP loadbalancer using nginx & kubernetes.

It uses:

nginx-loadbalancer: nginx + confd based loadbalancer (in this case etcd is used as a backend).
loadbalancer-feeder: kubelistener listens to kubernetes pod events and changes etcd accordingly following our loadbalancer rules.
helloworld: It renders the 'Hello from <hostname>' message as a http response in order to identify if it's actually doing the load balancing.

$> etcdctl ls --recursive /lb
/lb/hosts
/lb/hosts/lisa.contoso.com
/lb/hosts/lisa.contoso.com/listeners
/lb/hosts/lisa.contoso.com/listeners/ls1 = {"protocol":"http","address":"0.0.0.0:80"}
/lb/hosts/lisa.contoso.com/locations 
/lb/hosts/lisa.contoso.com/locations/loc1 = {"path":"/","upstream":"helloworld-"}
/lb/upstreams
/lb/upstreams/helloworld-
/lb/upstreams/helloworld-/servers
/lb/upstreams/helloworld-/servers/eb636d5d-f8c0-11e4-b35e-080027520379 = {"url":"10.244.49.30:8080"}
/lb/upstreams/helloworld-/servers/eb63c855-f8c0-11e4-b35e-080027520379 = {"url":"10.244.49.31:8080"}
/lb/upstreams/helloworld-/servers/eb63e9d7-f8c0-11e4-b35e-080027520379 = {"url":"10.244.49.32:8080"}

Note: No! - is not a typo error, it's the generateName parameter if pod was created using a replication controller :-).

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kubernetes-http-loadbalancer's Issues

How to set the conf data?

I setup the three pods included in the example. From my master server I manually set the /lb/hosts keys using etcdctl set ...

But how are the /lb/upstreams/helloworld- keys supposed to be set? What are the subkeys under /servers (in the example they are guids, referring to what?)

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