1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
package kubernetes
import (
"errors"
"fmt"
"strings"
"time"
"github.com/miekg/coredns/core/dnsserver"
"github.com/miekg/coredns/middleware"
"github.com/mholt/caddy"
unversionedapi "k8s.io/client-go/1.5/pkg/api/unversioned"
)
func init() {
caddy.RegisterPlugin("kubernetes", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
kubernetes, err := kubernetesParse(c)
if err != nil {
return middleware.Error("kubernetes", err)
}
err = kubernetes.InitKubeCache()
if err != nil {
return middleware.Error("kubernetes", err)
}
// Register KubeCache start and stop functions with Caddy
c.OnStartup(func() error {
go kubernetes.APIConn.Run()
return nil
})
c.OnShutdown(func() error {
return kubernetes.APIConn.Stop()
})
dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
kubernetes.Next = next
return kubernetes
})
return nil
}
func kubernetesParse(c *caddy.Controller) (*Kubernetes, error) {
k8s := &Kubernetes{ResyncPeriod: defaultResyncPeriod}
k8s.PodMode = PodModeDisabled
for c.Next() {
if c.Val() == "kubernetes" {
zones := c.RemainingArgs()
if len(zones) == 0 {
k8s.Zones = make([]string, len(c.ServerBlockKeys))
copy(k8s.Zones, c.ServerBlockKeys)
}
k8s.Zones = NormalizeZoneList(zones)
middleware.Zones(k8s.Zones).Normalize()
if k8s.Zones == nil || len(k8s.Zones) < 1 {
return nil, errors.New("Zone name must be provided for kubernetes middleware.")
}
k8s.primaryZone = -1
for i, z := range k8s.Zones {
if strings.HasSuffix(z, "in-addr.arpa.") || strings.HasSuffix(z, "ip6.arpa.") {
continue
}
k8s.primaryZone = i
break
}
if k8s.primaryZone == -1 {
return nil, errors.New("A non-reverse zone name must be given for Kubernetes.")
}
for c.NextBlock() {
switch c.Val() {
case "pods":
args := c.RemainingArgs()
if len(args) == 1 {
switch args[0] {
case PodModeDisabled, PodModeInsecure:
k8s.PodMode = args[0]
default:
return nil, errors.New("pods must be one of: disabled, insecure")
}
continue
}
return nil, c.ArgErr()
case "namespaces":
args := c.RemainingArgs()
if len(args) > 0 {
k8s.Namespaces = append(k8s.Namespaces, args...)
continue
}
return nil, c.ArgErr()
case "endpoint":
args := c.RemainingArgs()
if len(args) > 0 {
k8s.APIEndpoint = args[0]
continue
}
return nil, c.ArgErr()
case "tls": // cert key cacertfile
args := c.RemainingArgs()
if len(args) == 3 {
k8s.APIClientCert, k8s.APIClientKey, k8s.APICertAuth = args[0], args[1], args[2]
continue
}
return nil, c.ArgErr()
case "resyncperiod":
args := c.RemainingArgs()
if len(args) > 0 {
rp, err := time.ParseDuration(args[0])
if err != nil {
return nil, fmt.Errorf("Unable to parse resync duration value. Value provided was '%v'. Example valid values: '15s', '5m', '1h'. Error was: %v", args[0], err)
}
k8s.ResyncPeriod = rp
continue
}
return nil, c.ArgErr()
case "labels":
args := c.RemainingArgs()
if len(args) > 0 {
labelSelectorString := strings.Join(args, " ")
ls, err := unversionedapi.ParseToLabelSelector(labelSelectorString)
if err != nil {
return nil, fmt.Errorf("Unable to parse label selector. Value provided was '%v'. Error was: %v", labelSelectorString, err)
}
k8s.LabelSelector = ls
continue
}
return nil, c.ArgErr()
}
}
return k8s, nil
}
}
return nil, errors.New("Kubernetes setup called without keyword 'kubernetes' in Corefile")
}
const (
defaultResyncPeriod = 5 * time.Minute
defaultPodMode = PodModeDisabled
)
|
