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Add hairpin support for externalIps

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Add an extra annotation for service in order to generate haipin related
iptables rules for externalsIps of the service.
This commit is contained in:
Aurélien Dunand 2020-08-04 12:15:52 +02:00 committed by Aaron U'Ren
parent 7d47aefe7d
commit 5fc39db6a0
2 changed files with 22 additions and 6 deletions
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5
docs/user-guide.md
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@ -216,6 +216,11 @@ To enable hairpin traffic for Service `my-service`:
kubectl annotate service my-service "kube-router.io/service.hairpin="
```
If you want hairpin also apply on externalIPs declared for Service `my-service`:
```
kubectl annotate service my-service "kube-router.io/service.hairpin.externalips="
```
## Direct server return
Please read below blog on how to user DSR in combination with `--advertise-external-ip` to build highly scalable and available ingress.

23
pkg/controllers/proxy/network_services_controller.go
View File

@ -47,12 +47,13 @@ const (
IpvsSvcFSched2 = "flag-2"
IpvsSvcFSched3 = "flag-3"
svcDSRAnnotation = "kube-router.io/service.dsr"
svcSchedulerAnnotation = "kube-router.io/service.scheduler"
svcHairpinAnnotation = "kube-router.io/service.hairpin"
svcLocalAnnotation = "kube-router.io/service.local"
svcSkipLbIpsAnnotation = "kube-router.io/service.skiplbips"
svcSchedFlagsAnnotation = "kube-router.io/service.schedflags"
svcDSRAnnotation = "kube-router.io/service.dsr"
svcSchedulerAnnotation = "kube-router.io/service.scheduler"
svcHairpinAnnotation = "kube-router.io/service.hairpin"
svcHairpinExternalIPsAnnotation = "kube-router.io/service.hairpin.externalips"
svcLocalAnnotation = "kube-router.io/service.local"
svcSkipLbIpsAnnotation = "kube-router.io/service.skiplbips"
svcSchedFlagsAnnotation = "kube-router.io/service.schedflags"
LeaderElectionRecordAnnotationKey = "control-plane.alpha.kubernetes.io/leader"
localIPsIPSetName = "kube-router-local-ips"
@ -257,6 +258,7 @@ type serviceInfo struct {
scheduler string
directServerReturnMethod string
hairpin bool
hairpinExternalIPs bool
skipLbIps bool
externalIPs []string
loadBalancerIPs []string
@ -1399,6 +1401,7 @@ func (nsc *NetworkServicesController) buildServicesInfo() serviceInfoMap {
svcInfo.sessionAffinityTimeoutSeconds = *svc.Spec.SessionAffinityConfig.ClientIP.TimeoutSeconds
}
_, svcInfo.hairpin = svc.ObjectMeta.Annotations[svcHairpinAnnotation]
_, svcInfo.hairpinExternalIPs = svc.ObjectMeta.Annotations[svcHairpinExternalIPsAnnotation]
_, svcInfo.local = svc.ObjectMeta.Annotations[svcLocalAnnotation]
_, svcInfo.skipLbIps = svc.ObjectMeta.Annotations[svcSkipLbIpsAnnotation]
if svc.Spec.ExternalTrafficPolicy == api.ServiceExternalTrafficPolicyTypeLocal {
@ -1574,6 +1577,14 @@ func (nsc *NetworkServicesController) syncHairpinIptablesRules() error {
rule, ruleArgs := hairpinRuleFrom(svcInfo.clusterIP.String(), ep.ip, svcInfo.port)
rulesNeeded[rule] = ruleArgs
// Handle ExternalIPs if requested
if svcInfo.hairpinExternalIPs {
for _, extip := range svcInfo.externalIPs {
rule, ruleArgs := hairpinRuleFrom(extip, ep.ip, svcInfo.port)
rulesNeeded[rule] = ruleArgs
}
}
// Handle NodePort Service
if svcInfo.nodePort != 0 {
rule, ruleArgs := hairpinRuleFrom(nsc.nodeIP.String(), ep.ip, svcInfo.nodePort)