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:kubelistenerlistens 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 :-).