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
187
188
|
package test
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
"github.com/coredns/coredns/plugin/metrics"
"github.com/coredns/coredns/plugin/metrics/vars"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
// Start test server that has metrics enabled. Then tear it down again.
func TestMetricsServer(t *testing.T) {
corefile := `example.org:0 {
chaos CoreDNS-001 miek@miek.nl
prometheus localhost:0
}
example.com:0 {
forward . 8.8.4.4:53
prometheus localhost:0
}
`
srv, err := CoreDNSServer(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
defer srv.Stop()
}
func TestMetricsRefused(t *testing.T) {
metricName := "coredns_dns_response_rcode_count_total"
corefile := `example.org:0 {
forward . 8.8.8.8:53
prometheus localhost:0
}
`
srv, udp, _, err := CoreDNSServerAndPorts(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
defer srv.Stop()
m := new(dns.Msg)
m.SetQuestion("google.com.", dns.TypeA)
if _, err = dns.Exchange(m, udp); err != nil {
t.Fatalf("Could not send message: %s", err)
}
data := test.Scrape("http://" + metrics.ListenAddr + "/metrics")
got, labels := test.MetricValue(metricName, data)
if got != "1" {
t.Errorf("Expected value %s for refused, but got %s", "1", got)
}
if labels["zone"] != vars.Dropped {
t.Errorf("Expected zone value %s for refused, but got %s", vars.Dropped, labels["zone"])
}
if labels["rcode"] != "REFUSED" {
t.Errorf("Expected zone value %s for refused, but got %s", "REFUSED", labels["rcode"])
}
}
func TestMetricsAuto(t *testing.T) {
tmpdir, err := ioutil.TempDir(os.TempDir(), "coredns")
if err != nil {
t.Fatal(err)
}
corefile := `org:0 {
auto {
directory ` + tmpdir + ` db\.(.*) {1} 1
}
prometheus localhost:0
}
`
i, err := CoreDNSServer(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
udp, _ := CoreDNSServerPorts(i, 0)
if udp == "" {
t.Fatalf("Could not get UDP listening port")
}
defer i.Stop()
// Write db.example.org to get example.org.
if err = ioutil.WriteFile(filepath.Join(tmpdir, "db.example.org"), []byte(zoneContent), 0644); err != nil {
t.Fatal(err)
}
// TODO(miek): make the auto sleep even less.
time.Sleep(1100 * time.Millisecond) // wait for it to be picked up
m := new(dns.Msg)
m.SetQuestion("www.example.org.", dns.TypeA)
if _, err := dns.Exchange(m, udp); err != nil {
t.Fatalf("Could not send message: %s", err)
}
metricName := "coredns_dns_request_count_total" //{zone, proto, family}
data := test.Scrape("http://" + metrics.ListenAddr + "/metrics")
// Get the value for the metrics where the one of the labels values matches "example.org."
got, _ := test.MetricValueLabel(metricName, "example.org.", data)
if got != "1" {
t.Errorf("Expected value %s for %s, but got %s", "1", metricName, got)
}
// Remove db.example.org again. And see if the metric stops increasing.
os.Remove(filepath.Join(tmpdir, "db.example.org"))
time.Sleep(1100 * time.Millisecond) // wait for it to be picked up
if _, err := dns.Exchange(m, udp); err != nil {
t.Fatalf("Could not send message: %s", err)
}
data = test.Scrape("http://" + metrics.ListenAddr + "/metrics")
got, _ = test.MetricValueLabel(metricName, "example.org.", data)
if got != "1" {
t.Errorf("Expected value %s for %s, but got %s", "1", metricName, got)
}
}
// Show that when 2 blocs share the same metric listener (they have a prometheus plugin on the same listening address),
// ALL the metrics of the second bloc in order are declared in prometheus, especially the plugins that are used ONLY in the second bloc
func TestMetricsSeveralBlocs(t *testing.T) {
cacheSizeMetricName := "coredns_cache_size"
addrMetrics := "localhost:9155"
corefile := fmt.Sprintf(`
example.org:0 {
prometheus %s
forward . 8.8.8.8:53 {
force_tcp
}
}
google.com:0 {
prometheus %s
forward . 8.8.8.8:53 {
force_tcp
}
cache
}
`, addrMetrics, addrMetrics)
i, udp, _, err := CoreDNSServerAndPorts(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
defer i.Stop()
// send an initial query to setup properly the cache size
m := new(dns.Msg)
m.SetQuestion("google.com.", dns.TypeA)
if _, err = dns.Exchange(m, udp); err != nil {
t.Fatalf("Could not send message: %s", err)
}
beginCacheSize := test.ScrapeMetricAsInt(addrMetrics, cacheSizeMetricName, "", 0)
// send an query, different from initial to ensure we have another add to the cache
m = new(dns.Msg)
m.SetQuestion("www.google.com.", dns.TypeA)
if _, err = dns.Exchange(m, udp); err != nil {
t.Fatalf("Could not send message: %s", err)
}
endCacheSize := test.ScrapeMetricAsInt(addrMetrics, cacheSizeMetricName, "", 0)
if err != nil {
t.Errorf("Unexpected metric data retrieved for %s : %s", cacheSizeMetricName, err)
}
if endCacheSize-beginCacheSize != 1 {
t.Errorf("Expected metric data retrieved for %s, expected %d, got %d", cacheSizeMetricName, 1, endCacheSize-beginCacheSize)
}
}
|
