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services-controller: Add LoadBalancer Service support (#53)

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* Allow LoadBalancer Service type
* Update docs
This commit is contained in:
Bryan Zubrod 2017-07-11 18:12:11 -05:00 committed by GitHub
parent 537cacc5c8
commit a3bddf6ecd
4 changed files with 8 additions and 8 deletions
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8
README.md
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@ -120,10 +120,10 @@ leverages standard Linux technologies **iptables, ipvs/lvs, ipset, iproute2**
[Kubernetes network services proxy with IPVS/LVS](https://cloudnativelabs.github.io/post/2017-05-10-kube-network-service-proxy/)
Kube-router uses IPVS/LVS technology built in Linux to provide L4 load
balancing. Each **ClusterIP** and **NodePort** Kubernetes Service type is
configured as an IPVS virtual service. Each Service Endpoint is configured as
real server to the virtual service. The standard **ipvsadm** tool can be used
to verify the configuration and monitor the active connections.
balancing. Each **ClusterIP**, **NodePort**, and **LoadBalancer** Kubernetes
Service type is configured as an IPVS virtual service. Each Service Endpoint is
configured as real server to the virtual service. The standard **ipvsadm** tool
can be used to verify the configuration and monitor the active connections.
Below is example set of Services on Kubernetes:

2
app/controllers/network_routes_controller.go
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@ -118,7 +118,7 @@ func (nrc *NetworkRoutingController) Run(stopCh <-chan struct{}, wg *sync.WaitGr
if nrc.advertiseClusterIp {
glog.Infof("Advertising cluster ips")
for _, svc := range watchers.ServiceWatcher.List() {
if svc.Spec.Type == "ClusterIP" || svc.Spec.Type == "NodePort" {
if svc.Spec.Type == "ClusterIP" || svc.Spec.Type == "NodePort" || svc.Spec.Type == "LoadBalancer" {
// skip headless services
if svc.Spec.ClusterIP == "None" || svc.Spec.ClusterIP == "" {

4
app/controllers/network_services_controller.go
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@ -34,7 +34,7 @@ var (
)
// Network services controller enables local node as network service proxy through IPVS/LVS.
// Support only Kuberntes network services of type NodePort, ClusterIP. For each service a
// Support only Kubernetes network services of type NodePort, ClusterIP, and LoadBalancer. For each service a
// IPVS service is created and for each service endpoint a server is added to the IPVS service.
// As services and endpoints are updated, network service controller gets the updates from
// the kubernetes api server and syncs the ipvs configuration to reflect state of services
@ -317,7 +317,7 @@ func buildServicesInfo() serviceInfoMap {
continue
}
if svc.Spec.Type == "LoadBalancer" || svc.Spec.Type == "ExternalName" {
if svc.Spec.Type == "ExternalName" {
glog.Infof("Skipping service name:%s namespace:%s due to service Type=%s", svc.Name, svc.Namespace, svc.Spec.Type)
continue
}

2
app/options/options.go
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@ -63,5 +63,5 @@ func (s *KubeRouterConfig) AddFlags(fs *pflag.FlagSet) {
fs.StringVar(&s.PeerAsn, "peer-asn", s.PeerAsn, "ASN number of the BGP peer to which cluster nodes will advertise cluster ip and node's pod cidr")
fs.BoolVar(&s.FullMeshMode, "nodes-full-mesh", s.FullMeshMode, "When enabled each node in the cluster will setup BGP peer with rest of the nodes. True by default")
fs.StringVar(&s.HostnameOverride, "hostname-override", s.HostnameOverride, "If non-empty, will use this string as identification instead of the actual hostname.")
fs.BoolVar(&s.GlobalHairpinMode, "hairpin-mode", s.GlobalHairpinMode, "Adds iptable rules for every ClusterIP Service Endpoint to support hairpin traffic. False by default")
fs.BoolVar(&s.GlobalHairpinMode, "hairpin-mode", s.GlobalHairpinMode, "Adds iptable rules for every Service Endpoint to support hairpin traffic. False by default")
}