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middleware/kubernetes: Server side path lookups (#750)

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* initial commit

* add config options

* add readme

* rewording

* revert unlreated change

* normalize host domain path

* add ndots opt, allow > 1 host domains, pull host domains from resolv.conf

* implementing review feedback

* update readme

* use dns lib, config format, defaults

* Correct autopath example.
This commit is contained in:
Chris O'Haver 2017-06-28 18:44:30 -04:00 • committed by John Belamaric
parent 817f3960b8
commit edf71fb168
6 changed files with 407 additions and 51 deletions
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50
middleware/kubernetes/setup.go
View file

@ -4,6 +4,7 @@ import (
"errors"
"fmt"
"net"
"strconv"
"strings"
"time"
@ -11,6 +12,7 @@ import (
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/pkg/dnsutil"
"github.com/coredns/coredns/middleware/proxy"
"github.com/miekg/dns"
"github.com/mholt/caddy"
unversionedapi "k8s.io/client-go/1.5/pkg/api/unversioned"
@ -187,7 +189,48 @@ func kubernetesParse(c *caddy.Controller) (*Kubernetes, error) {
continue
}
return nil, fmt.Errorf("incorrect number of arguments for federation, got %v, expected 2", len(args))
case "autopath": // name zone
args := c.RemainingArgs()
k8s.AutoPath = AutoPath{
NDots: defautNdots,
HostSearchPath: []string{},
ResolvConfFile: defaultResolvConfFile,
OnNXDOMAIN: defaultOnNXDOMAIN,
}
if len(args) > 3 {
return nil, fmt.Errorf("incorrect number of arguments for autopath, got %v, expected at most 3", len(args))
}
if len(args) > 0 {
ndots, err := strconv.Atoi(args[0])
if err != nil {
return nil, fmt.Errorf("invalid NDOTS argument for autopath, got '%v', expected an integer", ndots)
}
k8s.AutoPath.NDots = ndots
}
if len(args) > 1 {
switch args[1] {
case dns.RcodeToString[dns.RcodeNameError]:
k8s.AutoPath.OnNXDOMAIN = dns.RcodeNameError
case dns.RcodeToString[dns.RcodeSuccess]:
k8s.AutoPath.OnNXDOMAIN = dns.RcodeSuccess
case dns.RcodeToString[dns.RcodeServerFailure]:
k8s.AutoPath.OnNXDOMAIN = dns.RcodeServerFailure
default:
return nil, fmt.Errorf("invalid RESPONSE argument for autopath, got '%v', expected SERVFAIL, NOERROR, or NXDOMAIN", args[1])
}
}
if len(args) > 2 {
k8s.AutoPath.ResolvConfFile = args[2]
}
rc, err := dns.ClientConfigFromFile(k8s.AutoPath.ResolvConfFile)
if err != nil {
return nil, fmt.Errorf("error when parsing %v: %v", k8s.AutoPath.ResolvConfFile, err)
}
k8s.AutoPath.HostSearchPath = rc.Search
middleware.Zones(k8s.AutoPath.HostSearchPath).Normalize()
k8s.AutoPath.Enabled = true
continue
}
}
return k8s, nil
@ -197,6 +240,9 @@ func kubernetesParse(c *caddy.Controller) (*Kubernetes, error) {
}
const (
defaultResyncPeriod = 5 * time.Minute
defaultPodMode = PodModeDisabled
defaultResyncPeriod = 5 * time.Minute
defaultPodMode = PodModeDisabled
defautNdots = 0
defaultResolvConfFile = "/etc/resolv.conf"
defaultOnNXDOMAIN = dns.RcodeServerFailure
)