forked from prometheus/prometheus
/
kubernetes.go
186 lines (161 loc) · 4.97 KB
/
kubernetes.go
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kubernetes
import (
"io/ioutil"
"time"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
"golang.org/x/net/context"
"k8s.io/client-go/1.5/kubernetes"
"k8s.io/client-go/1.5/pkg/api"
apiv1 "k8s.io/client-go/1.5/pkg/api/v1"
"k8s.io/client-go/1.5/pkg/util/runtime"
"k8s.io/client-go/1.5/rest"
"k8s.io/client-go/1.5/tools/cache"
)
const (
// kubernetesMetaLabelPrefix is the meta prefix used for all meta labels.
// in this discovery.
metaLabelPrefix = model.MetaLabelPrefix + "kubernetes_"
namespaceLabel = metaLabelPrefix + "namespace"
)
// Kubernetes implements the TargetProvider interface for discovering
// targets from Kubernetes.
type Kubernetes struct {
client kubernetes.Interface
role config.KubernetesRole
logger log.Logger
}
func init() {
runtime.ErrorHandlers = append(runtime.ErrorHandlers, func(err error) {
log.With("component", "kube_client_runtime").Errorln(err)
})
}
// New creates a new Kubernetes discovery for the given role.
func New(l log.Logger, conf *config.KubernetesSDConfig) (*Kubernetes, error) {
var (
kcfg *rest.Config
err error
)
if conf.APIServer.URL == nil {
kcfg, err = rest.InClusterConfig()
if err != nil {
return nil, err
}
} else {
token := conf.BearerToken
if conf.BearerTokenFile != "" {
bf, err := ioutil.ReadFile(conf.BearerTokenFile)
if err != nil {
return nil, err
}
token = string(bf)
}
kcfg = &rest.Config{
Host: conf.APIServer.String(),
BearerToken: token,
TLSClientConfig: rest.TLSClientConfig{
CAFile: conf.TLSConfig.CAFile,
},
}
}
kcfg.UserAgent = "prometheus/discovery"
if conf.BasicAuth != nil {
kcfg.Username = conf.BasicAuth.Username
kcfg.Password = conf.BasicAuth.Password
}
kcfg.TLSClientConfig.CertFile = conf.TLSConfig.CertFile
kcfg.TLSClientConfig.KeyFile = conf.TLSConfig.KeyFile
kcfg.Insecure = conf.TLSConfig.InsecureSkipVerify
c, err := kubernetes.NewForConfig(kcfg)
if err != nil {
return nil, err
}
return &Kubernetes{
client: c,
logger: l,
role: conf.Role,
}, nil
}
const resyncPeriod = 10 * time.Minute
// Run implements the TargetProvider interface.
func (k *Kubernetes) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
defer close(ch)
rclient := k.client.Core().GetRESTClient()
switch k.role {
case "endpoints":
elw := cache.NewListWatchFromClient(rclient, "endpoints", api.NamespaceAll, nil)
slw := cache.NewListWatchFromClient(rclient, "services", api.NamespaceAll, nil)
plw := cache.NewListWatchFromClient(rclient, "pods", api.NamespaceAll, nil)
eps := NewEndpoints(
k.logger.With("kubernetes_sd", "endpoint"),
cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
cache.NewSharedInformer(elw, &apiv1.Endpoints{}, resyncPeriod),
cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
)
go eps.endpointsInf.Run(ctx.Done())
go eps.serviceInf.Run(ctx.Done())
go eps.podInf.Run(ctx.Done())
for !eps.serviceInf.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
for !eps.endpointsInf.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
for !eps.podInf.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
eps.Run(ctx, ch)
case "pod":
plw := cache.NewListWatchFromClient(rclient, "pods", api.NamespaceAll, nil)
pod := NewPod(
k.logger.With("kubernetes_sd", "pod"),
cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
)
go pod.informer.Run(ctx.Done())
for !pod.informer.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
pod.Run(ctx, ch)
case "service":
slw := cache.NewListWatchFromClient(rclient, "services", api.NamespaceAll, nil)
svc := NewService(
k.logger.With("kubernetes_sd", "service"),
cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
)
go svc.informer.Run(ctx.Done())
for !svc.informer.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
svc.Run(ctx, ch)
case "node":
nlw := cache.NewListWatchFromClient(rclient, "nodes", api.NamespaceAll, nil)
node := NewNode(
k.logger.With("kubernetes_sd", "node"),
cache.NewSharedInformer(nlw, &apiv1.Node{}, resyncPeriod),
)
go node.informer.Run(ctx.Done())
for !node.informer.HasSynced() {
time.Sleep(100 * time.Millisecond)
}
node.Run(ctx, ch)
default:
k.logger.Errorf("unknown Kubernetes discovery kind %q", k.role)
}
<-ctx.Done()
}
func lv(s string) model.LabelValue {
return model.LabelValue(s)
}