forked from docker-archive/infra-container_exporter
/
main.go
72 lines (64 loc) · 2.19 KB
/
main.go
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package main
import (
"flag"
"log"
"net/http"
"strings"
"github.com/golang/glog"
"github.com/fsouza/go-dockerclient"
"github.com/prometheus/client_golang/prometheus"
)
var (
listeningAddress = flag.String("telemetry.address", ":9104", "Address on which to expose metrics.")
metricsEndpoint = flag.String("telemetry.endpoint", "/metrics", "Path under which to expose metrics.")
addr = flag.String("addr", "unix:///var/run/docker.sock", "Docker address to connect to")
parent = flag.String("parent", "/docker", "Parent cgroup")
authUser = flag.String("auth.user", "", "Username for basic auth.")
authPass = flag.String("auth.pass", "", "Password for basic auth. Enables basic auth if set.")
labelString = flag.String("labels", "", "A comma seperated list of docker labels to export for containers.")
)
type basicAuthHandler struct {
handler http.HandlerFunc
user string
password string
}
func (h *basicAuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
user, password, ok := r.BasicAuth()
if !ok || password != h.password || user != h.user {
w.Header().Set("WWW-Authenticate", "Basic realm=\"metrics\"")
http.Error(w, "Invalid username or password", http.StatusUnauthorized)
return
}
h.handler(w, r)
return
}
func main() {
flag.Parse()
manager := newDockerManager(*addr, *parent)
var labels []string
if *labelString != "" {
labels = strings.Split(*labelString, ",")
} else {
labels = make([]string, 0)
}
dockerClient, err := docker.NewClient("unix:///var/run/docker.sock")
if err != nil {
log.Fatalf("Unable to start docker client %v", err.Error())
}
exporter := NewExporter(manager, *dockerClient, labels)
prometheus.MustRegister(exporter)
log.Printf("Starting Server: %s", *listeningAddress)
handler := prometheus.Handler()
if *authUser != "" || *authPass != "" {
if *authUser == "" || *authPass == "" {
glog.Fatal("You need to specify -auth.user and -auth.pass to enable basic auth")
}
handler = &basicAuthHandler{
handler: prometheus.Handler().ServeHTTP,
user: *authUser,
password: *authPass,
}
}
http.Handle(*metricsEndpoint, handler)
log.Fatal(http.ListenAndServe(*listeningAddress, nil))
}