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plugin/k8s_external: Resolve headless services (#5505)

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*add option for resolving headless Services without external IPs in k8s_external

Signed-off-by: Tomas Kohout <tomas.kohout1995@gmail.com>
This commit is contained in:
TomasKohout 2022-08-30 20:59:27 +02:00 • committed by GitHub
parent b218b56063
commit 6782b7fb42
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15 changed files with 491 additions and 81 deletions
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19
plugin/kubernetes/ns.go
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@ -13,7 +13,7 @@ func isDefaultNS(name, zone string) bool {
// nsAddrs returns the A or AAAA records for the CoreDNS service in the cluster. If the service cannot be found,
// it returns a record for the local address of the machine we're running on.
func (k *Kubernetes) nsAddrs(external bool, zone string) []dns.RR {
func (k *Kubernetes) nsAddrs(external, headless bool, zone string) []dns.RR {
var (
svcNames []string
svcIPs []net.IP
@ -31,10 +31,21 @@ func (k *Kubernetes) nsAddrs(external bool, zone string) []dns.RR {
for _, svc := range svcs {
if external {
svcName := strings.Join([]string{svc.Name, svc.Namespace, zone}, ".")
for _, exIP := range svc.ExternalIPs {
svcNames = append(svcNames, svcName)
svcIPs = append(svcIPs, net.ParseIP(exIP))
if headless && svc.Headless() {
for _, s := range endpoint.Subsets {
for _, a := range s.Addresses {
svcNames = append(svcNames, endpointHostname(a, k.endpointNameMode)+"."+svcName)
svcIPs = append(svcIPs, net.ParseIP(a.IP))
}
}
} else {
for _, exIP := range svc.ExternalIPs {
svcNames = append(svcNames, svcName)
svcIPs = append(svcIPs, net.ParseIP(exIP))
}
}
continue
}
svcName := strings.Join([]string{svc.Name, svc.Namespace, Svc, zone}, ".")