// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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.
// Binary dnsmasq_exporter is a Prometheus exporter for dnsmasq statistics.
package main
import (
"flag"
"log"
"net/http"
"github.com/google/dnsmasq_exporter/collector"
"github.com/miekg/dns"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/version"
)
var (
listen = flag.String("listen",
"localhost:9153",
"listen address")
exposeLeases = flag.Bool("expose_leases",
false,
"expose dnsmasq leases as metrics (high cardinality)")
leasesPath = flag.String("leases_path",
"/var/lib/misc/dnsmasq.leases",
"path to the dnsmasq leases file")
dnsmasqAddr = flag.String("dnsmasq",
"localhost:53",
"dnsmasq host:port address")
metricsPath = flag.String("metrics_path",
"/metrics",
"path under which metrics are served")
)
func init() {
prometheus.MustRegister(version.NewCollector("dnsmasq_exporter"))
}
func main() {
flag.Parse()
var (
dnsClient = &dns.Client{
SingleInflight: true,
}
cfg = collector.Config{
DnsClient: dnsClient,
DnsmasqAddr: *dnsmasqAddr,
LeasesPath: *leasesPath,
ExposeLeases: *exposeLeases,
}
collector = collector.New(cfg)
reg = prometheus.NewRegistry()
)
reg.MustRegister(collector)
http.Handle(*metricsPath, promhttp.HandlerFor(
prometheus.Gatherers{prometheus.DefaultGatherer, reg},
promhttp.HandlerOpts{},
))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`
Dnsmasq Exporter
Dnsmasq Exporter
Metrics
`))
})
log.Println("Listening on", *listen)
log.Println("Service metrics under", *metricsPath)
log.Fatal(http.ListenAndServe(*listen, nil))
}