c1c98924c3
* Add new plugin: external This plugin works in conjunction with the kubernetes plugin and exports ingress and LB addresses as DNS records. It bypasses backend.go and backend_lookup.go flow because it is not needed. README, tests are implemented. The tests only exercise the unit tests, this has not been tested in any ci. Signed-off-by: Miek Gieben <miek@miek.nl> * Rename to k8s_external Signed-off-by: Miek Gieben <miek@miek.nl> * go gen Signed-off-by: Miek Gieben <miek@miek.nl>
65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package kubernetes
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import (
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"net"
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"strings"
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"github.com/miekg/dns"
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api "k8s.io/api/core/v1"
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)
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func isDefaultNS(name, zone string) bool {
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return strings.Index(name, defaultNSName) == 0 && strings.Index(name, zone) == len(defaultNSName)
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}
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// nsAddr return the A record for the CoreDNS service in the cluster. If it fails that it fallsback
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// on the local address of the machine we're running on.
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//
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// This function is rather expensive to run.
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func (k *Kubernetes) nsAddr() *dns.A {
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var (
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svcName string
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svcNamespace string
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)
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rr := new(dns.A)
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localIP := k.interfaceAddrsFunc()
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rr.A = localIP
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FindEndpoint:
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for _, ep := range k.APIConn.EpIndexReverse(localIP.String()) {
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for _, eps := range ep.Subsets {
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for _, addr := range eps.Addresses {
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if localIP.Equal(net.ParseIP(addr.IP)) {
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svcNamespace = ep.Namespace
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svcName = ep.Name
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break FindEndpoint
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}
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}
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}
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}
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if len(svcName) == 0 {
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rr.Hdr.Name = defaultNSName
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rr.A = localIP
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return rr
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}
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FindService:
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for _, svc := range k.APIConn.ServiceList() {
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if svcName == svc.Name && svcNamespace == svc.Namespace {
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if svc.ClusterIP == api.ClusterIPNone {
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rr.A = localIP
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} else {
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rr.A = net.ParseIP(svc.ClusterIP)
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}
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break FindService
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}
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}
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rr.Hdr.Name = strings.Join([]string{svcName, svcNamespace, "svc."}, ".")
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return rr
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}
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const defaultNSName = "ns.dns."
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