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Build backend config using the K8S endpoint resource.

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* Potentialy saves a network hop
* Ability to configure LB algothim (given some work to expose an
anotation etc...)
* K8s config Watch is triggered far less often
This commit is contained in:
Ed Robinson 2016-05-20 17:34:57 +01:00
parent b79535f369
commit e948a013cd
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GPG key ID: EC501FCA6421CCF0
4 changed files with 210 additions and 42 deletions
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38
provider/kubernetes.go
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@ -209,9 +209,27 @@ func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configur
if port.Port == 443 {
protocol = "https"
}
templateObjects.Backends[r.Host+pa.Path].Servers[string(service.UID)] = types.Server{
URL: protocol + "://" + service.Spec.ClusterIP + ":" + strconv.Itoa(port.Port),
Weight: 1,
endpoints, err := k8sClient.GetEndpoints(service.ObjectMeta.Name, service.ObjectMeta.Namespace)
if err != nil {
log.Errorf("Error retrieving endpoints: %v", err)
continue
}
if len(endpoints.Subsets) == 0 {
log.Warnf("Endpoints not found for %s/%s, falling back to Service ClusterIP", service.ObjectMeta.Namespace, service.ObjectMeta.Name)
templateObjects.Backends[r.Host+pa.Path].Servers[string(service.UID)] = types.Server{
URL: protocol + "://" + service.Spec.ClusterIP + ":" + strconv.Itoa(port.Port),
Weight: 1,
}
} else {
for _, subset := range endpoints.Subsets {
for _, address := range subset.Addresses {
url := protocol + "://" + address.IP + ":" + strconv.Itoa(endpointPortNumber(port, subset.Ports))
templateObjects.Backends[r.Host+pa.Path].Servers[url] = types.Server{
URL: url,
Weight: 1,
}
}
}
}
break
}
@ -223,6 +241,20 @@ func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configur
return &templateObjects, nil
}
func endpointPortNumber(servicePort k8s.ServicePort, endpointPorts []k8s.EndpointPort) int {
if len(endpointPorts) > 0 {
//name is optional if there is only one port
port := endpointPorts[0]
for _, endpointPort := range endpointPorts {
if servicePort.Name == endpointPort.Name {
port = endpointPort
}
}
return int(port.Port)
}
return servicePort.Port
}
func equalPorts(servicePort k8s.ServicePort, ingressPort k8s.IntOrString) bool {
if servicePort.Port == ingressPort.IntValue() {
return true