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Add new plugin: external - resolve k8s ingress and LB address with external names (#2379)

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* 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>
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Miek Gieben 2018-12-14 09:41:51 +00:00 • committed by GitHub
parent d9880681c3
commit c1c98924c3
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105
plugin/k8s_external/apex_test.go Normal file
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package external
import (
"context"
"testing"
"github.com/coredns/coredns/plugin/kubernetes"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
func TestApex(t *testing.T) {
k := kubernetes.New([]string{"cluster.local."})
k.Namespaces = map[string]struct{}{"testns": struct{}{}}
k.APIConn = &external{}
e := New()
e.Zones = []string{"example.com."}
e.Next = test.NextHandler(dns.RcodeSuccess, nil)
e.externalFunc = k.External
e.externalAddrFunc = externalAddress // internal test function
ctx := context.TODO()
for i, tc := range testsApex {
r := tc.Msg()
w := dnstest.NewRecorder(&test.ResponseWriter{})
_, err := e.ServeDNS(ctx, w, r)
if err != tc.Error {
t.Errorf("Test %d expected no error, got %v", i, err)
return
}
if tc.Error != nil {
continue
}
resp := w.Msg
if resp == nil {
t.Fatalf("Test %d, got nil message and no error for %q", i, r.Question[0].Name)
}
test.SortAndCheck(t, resp, tc)
}
}
var testsApex = []test.Case{
{
Qname: "example.com.", Qtype: dns.TypeSOA, Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "example.com.", Qtype: dns.TypeNS, Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.NS("example.com. 5 IN NS ns1.dns.example.com."),
},
Extra: []dns.RR{
test.A("example.com. 5 IN A 127.0.0.1"),
},
},
{
Qname: "example.com.", Qtype: dns.TypeSRV, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "dns.example.com.", Qtype: dns.TypeSRV, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "dns.example.com.", Qtype: dns.TypeNS, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "ns1.dns.example.com.", Qtype: dns.TypeSRV, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "ns1.dns.example.com.", Qtype: dns.TypeNS, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "ns1.dns.example.com.", Qtype: dns.TypeAAAA, Rcode: dns.RcodeSuccess,
Ns: []dns.RR{
test.SOA("example.com. 5 IN SOA ns1.dns.example.com. hostmaster.example.com. 1499347823 7200 1800 86400 5"),
},
},
{
Qname: "ns1.dns.example.com.", Qtype: dns.TypeA, Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("ns1.dns.example.com. 5 IN A 127.0.0.1"),
},
},
}