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consul_exporter.go
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consul_exporter.go
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// Copyright 2019 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 main
import (
"encoding/json"
"fmt"
"net/http"
_ "net/http/pprof"
"net/url"
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"gopkg.in/alecthomas/kingpin.v2"
consul_api "github.com/hashicorp/consul/api"
"github.com/hashicorp/go-cleanhttp"
)
const (
namespace = "consul"
)
var (
up = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "up"),
"Was the last query of Consul successful.",
nil, nil,
)
clusterServers = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "raft_peers"),
"How many peers (servers) are in the Raft cluster.",
nil, nil,
)
clusterLeader = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "raft_leader"),
"Does Raft cluster have a leader (according to this node).",
nil, nil,
)
nodeCount = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "serf_lan_members"),
"How many members are in the cluster.",
nil, nil,
)
memberStatus = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "serf_lan_member_status"),
"Status of member in the cluster. 1=Alive, 2=Leaving, 3=Left, 4=Failed.",
[]string{"member"}, nil,
)
serviceCount = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "catalog_services"),
"How many services are in the cluster.",
nil, nil,
)
serviceTag = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "service_tag"),
"Tags of a service.",
[]string{"service_id", "node", "tag"}, nil,
)
serviceNodesHealthy = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "catalog_service_node_healthy"),
"Is this service healthy on this node?",
[]string{"service_id", "node", "service_name"}, nil,
)
nodeChecks = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "health_node_status"),
"Status of health checks associated with a node.",
[]string{"check", "node", "status"}, nil,
)
serviceChecks = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "health_service_status"),
"Status of health checks associated with a service.",
[]string{"check", "node", "service_id", "service_name", "status"}, nil,
)
serviceCheckNames = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "service_checks"),
"Link the service id and check name if available.",
[]string{"service_id", "service_name", "check_id", "check_name", "node"}, nil,
)
keyValues = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "catalog_kv"),
"The values for selected keys in Consul's key/value catalog. Keys with non-numeric values are omitted.",
[]string{"key"}, nil,
)
queryOptions = consul_api.QueryOptions{}
)
type promHTTPLogger struct {
logger log.Logger
}
func (l promHTTPLogger) Println(v ...interface{}) {
level.Error(l.logger).Log("msg", fmt.Sprint(v...))
}
// Exporter collects Consul stats from the given server and exports them using
// the prometheus metrics package.
type Exporter struct {
client *consul_api.Client
kvPrefix string
kvFilter *regexp.Regexp
healthSummary bool
logger log.Logger
requestLimitChan chan struct{}
}
type consulOpts struct {
uri string
caFile string
certFile string
keyFile string
serverName string
timeout time.Duration
insecure bool
requestLimit int
}
// NewExporter returns an initialized Exporter.
func NewExporter(opts consulOpts, kvPrefix, kvFilter string, healthSummary bool, logger log.Logger) (*Exporter, error) {
uri := opts.uri
if !strings.Contains(uri, "://") {
uri = "http://" + uri
}
u, err := url.Parse(uri)
if err != nil {
return nil, fmt.Errorf("invalid consul URL: %s", err)
}
if u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") {
return nil, fmt.Errorf("invalid consul URL: %s", uri)
}
tlsConfig, err := consul_api.SetupTLSConfig(&consul_api.TLSConfig{
Address: opts.serverName,
CAFile: opts.caFile,
CertFile: opts.certFile,
KeyFile: opts.keyFile,
InsecureSkipVerify: opts.insecure,
})
if err != nil {
return nil, err
}
transport := cleanhttp.DefaultPooledTransport()
transport.TLSClientConfig = tlsConfig
config := consul_api.DefaultConfig()
config.Address = u.Host
config.Scheme = u.Scheme
if config.HttpClient == nil {
config.HttpClient = &http.Client{}
}
config.HttpClient.Timeout = opts.timeout
config.HttpClient.Transport = transport
client, err := consul_api.NewClient(config)
if err != nil {
return nil, err
}
var requestLimitChan chan struct{}
if opts.requestLimit > 0 {
requestLimitChan = make(chan struct{}, opts.requestLimit)
}
// Init our exporter.
return &Exporter{
client: client,
kvPrefix: kvPrefix,
kvFilter: regexp.MustCompile(kvFilter),
healthSummary: healthSummary,
logger: logger,
requestLimitChan: requestLimitChan,
}, nil
}
// Describe describes all the metrics ever exported by the Consul exporter. It
// implements prometheus.Collector.
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- up
ch <- clusterServers
ch <- clusterLeader
ch <- nodeCount
ch <- memberStatus
ch <- serviceCount
ch <- serviceNodesHealthy
ch <- nodeChecks
ch <- serviceChecks
ch <- keyValues
ch <- serviceTag
ch <- serviceCheckNames
}
// Collect fetches the stats from configured Consul location and delivers them
// as Prometheus metrics. It implements prometheus.Collector.
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
ok := e.collectPeersMetric(ch)
ok = e.collectLeaderMetric(ch) && ok
ok = e.collectNodesMetric(ch) && ok
ok = e.collectMembersMetric(ch) && ok
ok = e.collectServicesMetric(ch) && ok
ok = e.collectHealthStateMetric(ch) && ok
ok = e.collectKeyValues(ch) && ok
if ok {
ch <- prometheus.MustNewConstMetric(
up, prometheus.GaugeValue, 1.0,
)
} else {
ch <- prometheus.MustNewConstMetric(
up, prometheus.GaugeValue, 0.0,
)
}
}
func (e *Exporter) collectPeersMetric(ch chan<- prometheus.Metric) bool {
peers, err := e.client.Status().Peers()
if err != nil {
level.Error(e.logger).Log("msg", "Can't query consul", "err", err)
return false
}
ch <- prometheus.MustNewConstMetric(
clusterServers, prometheus.GaugeValue, float64(len(peers)),
)
return true
}
func (e *Exporter) collectLeaderMetric(ch chan<- prometheus.Metric) bool {
leader, err := e.client.Status().Leader()
if err != nil {
level.Error(e.logger).Log("msg", "Can't query consul", "err", err)
return false
}
if len(leader) == 0 {
ch <- prometheus.MustNewConstMetric(
clusterLeader, prometheus.GaugeValue, 0,
)
} else {
ch <- prometheus.MustNewConstMetric(
clusterLeader, prometheus.GaugeValue, 1,
)
}
return true
}
func (e *Exporter) collectNodesMetric(ch chan<- prometheus.Metric) bool {
nodes, _, err := e.client.Catalog().Nodes(&queryOptions)
if err != nil {
level.Error(e.logger).Log("msg", "Failed to query catalog for nodes", "err", err)
return false
}
ch <- prometheus.MustNewConstMetric(
nodeCount, prometheus.GaugeValue, float64(len(nodes)),
)
return true
}
func (e *Exporter) collectMembersMetric(ch chan<- prometheus.Metric) bool {
members, err := e.client.Agent().Members(false)
if err != nil {
level.Error(e.logger).Log("msg", "Failed to query member status", "err", err)
return false
}
for _, entry := range members {
ch <- prometheus.MustNewConstMetric(
memberStatus, prometheus.GaugeValue, float64(entry.Status), entry.Name,
)
}
return true
}
func (e *Exporter) collectServicesMetric(ch chan<- prometheus.Metric) bool {
serviceNames, _, err := e.client.Catalog().Services(&queryOptions)
if err != nil {
level.Error(e.logger).Log("msg", "Failed to query for services", "err", err)
return false
}
ch <- prometheus.MustNewConstMetric(
serviceCount, prometheus.GaugeValue, float64(len(serviceNames)),
)
if e.healthSummary {
if ok := e.collectHealthSummary(ch, serviceNames); !ok {
return false
}
}
return true
}
func (e *Exporter) collectHealthStateMetric(ch chan<- prometheus.Metric) bool {
checks, _, err := e.client.Health().State("any", &queryOptions)
if err != nil {
level.Error(e.logger).Log("msg", "Failed to query service health", "err", err)
return false
}
for _, hc := range checks {
var passing, warning, critical, maintenance float64
switch hc.Status {
case consul_api.HealthPassing:
passing = 1
case consul_api.HealthWarning:
warning = 1
case consul_api.HealthCritical:
critical = 1
case consul_api.HealthMaint:
maintenance = 1
}
if hc.ServiceID == "" {
ch <- prometheus.MustNewConstMetric(
nodeChecks, prometheus.GaugeValue, passing, hc.CheckID, hc.Node, consul_api.HealthPassing,
)
ch <- prometheus.MustNewConstMetric(
nodeChecks, prometheus.GaugeValue, warning, hc.CheckID, hc.Node, consul_api.HealthWarning,
)
ch <- prometheus.MustNewConstMetric(
nodeChecks, prometheus.GaugeValue, critical, hc.CheckID, hc.Node, consul_api.HealthCritical,
)
ch <- prometheus.MustNewConstMetric(
nodeChecks, prometheus.GaugeValue, maintenance, hc.CheckID, hc.Node, consul_api.HealthMaint,
)
} else {
ch <- prometheus.MustNewConstMetric(
serviceChecks, prometheus.GaugeValue, passing, hc.CheckID, hc.Node, hc.ServiceID, hc.ServiceName, consul_api.HealthPassing,
)
ch <- prometheus.MustNewConstMetric(
serviceChecks, prometheus.GaugeValue, warning, hc.CheckID, hc.Node, hc.ServiceID, hc.ServiceName, consul_api.HealthWarning,
)
ch <- prometheus.MustNewConstMetric(
serviceChecks, prometheus.GaugeValue, critical, hc.CheckID, hc.Node, hc.ServiceID, hc.ServiceName, consul_api.HealthCritical,
)
ch <- prometheus.MustNewConstMetric(
serviceChecks, prometheus.GaugeValue, maintenance, hc.CheckID, hc.Node, hc.ServiceID, hc.ServiceName, consul_api.HealthMaint,
)
ch <- prometheus.MustNewConstMetric(
serviceCheckNames, prometheus.GaugeValue, 1, hc.ServiceID, hc.ServiceName, hc.CheckID, hc.Name, hc.Node,
)
}
}
return true
}
// collectHealthSummary collects health information about every node+service
// combination. It will cause one lookup query per service.
func (e *Exporter) collectHealthSummary(ch chan<- prometheus.Metric, serviceNames map[string][]string) bool {
ok := make(chan bool)
for s := range serviceNames {
go func(s string) {
if e.requestLimitChan != nil {
e.requestLimitChan <- struct{}{}
defer func() {
<-e.requestLimitChan
}()
}
ok <- e.collectOneHealthSummary(ch, s)
}(s)
}
allOK := true
for range serviceNames {
allOK = <-ok && allOK
}
close(ok)
return allOK
}
func (e *Exporter) collectOneHealthSummary(ch chan<- prometheus.Metric, serviceName string) bool {
// See https://github.com/hashicorp/consul/issues/1096.
if strings.HasPrefix(serviceName, "/") {
level.Warn(e.logger).Log("msg", "Skipping service because it starts with a slash", "service_name", serviceName)
return true
}
level.Debug(e.logger).Log("msg", "Fetching health summary", "serviceName", serviceName)
service, _, err := e.client.Health().Service(serviceName, "", false, &queryOptions)
if err != nil {
level.Error(e.logger).Log("msg", "Failed to query service health", "err", err)
return false
}
for _, entry := range service {
// We have a Node, a Service, and one or more Checks. Our
// service-node combo is passing if all checks have a `status`
// of "passing."
passing := 1.
for _, hc := range entry.Checks {
if hc.Status != consul_api.HealthPassing {
passing = 0
break
}
}
ch <- prometheus.MustNewConstMetric(
serviceNodesHealthy, prometheus.GaugeValue, passing, entry.Service.ID, entry.Node.Node, entry.Service.Service,
)
tags := make(map[string]struct{})
for _, tag := range entry.Service.Tags {
if _, ok := tags[tag]; ok {
continue
}
ch <- prometheus.MustNewConstMetric(serviceTag, prometheus.GaugeValue, 1, entry.Service.ID, entry.Node.Node, tag)
tags[tag] = struct{}{}
}
}
return true
}
func (e *Exporter) collectKeyValues(ch chan<- prometheus.Metric) bool {
if e.kvPrefix == "" {
return true
}
kv := e.client.KV()
pairs, _, err := kv.List(e.kvPrefix, &queryOptions)
if err != nil {
level.Error(e.logger).Log("msg", "Error fetching key/values", "err", err)
return false
}
for _, pair := range pairs {
if e.kvFilter.MatchString(pair.Key) {
val, err := strconv.ParseFloat(string(pair.Value), 64)
if err == nil {
ch <- prometheus.MustNewConstMetric(
keyValues, prometheus.GaugeValue, val, pair.Key,
)
}
}
}
return true
}
func init() {
prometheus.MustRegister(version.NewCollector("consul_exporter"))
}
func main() {
var (
listenAddress = kingpin.Flag("web.listen-address", "Address to listen on for web interface and telemetry.").Default(":9107").String()
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
healthSummary = kingpin.Flag("consul.health-summary", "Generate a health summary for each service instance. Needs n+1 queries to collect all information.").Default("true").Bool()
kvPrefix = kingpin.Flag("kv.prefix", "Prefix from which to expose key/value pairs.").Default("").String()
kvFilter = kingpin.Flag("kv.filter", "Regex that determines which keys to expose.").Default(".*").String()
opts = consulOpts{}
)
kingpin.Flag("consul.server", "HTTP API address of a Consul server or agent. (prefix with https:// to connect over HTTPS)").Default("http://localhost:8500").StringVar(&opts.uri)
kingpin.Flag("consul.ca-file", "File path to a PEM-encoded certificate authority used to validate the authenticity of a server certificate.").Default("").StringVar(&opts.caFile)
kingpin.Flag("consul.cert-file", "File path to a PEM-encoded certificate used with the private key to verify the exporter's authenticity.").Default("").StringVar(&opts.certFile)
kingpin.Flag("consul.key-file", "File path to a PEM-encoded private key used with the certificate to verify the exporter's authenticity.").Default("").StringVar(&opts.keyFile)
kingpin.Flag("consul.server-name", "When provided, this overrides the hostname for the TLS certificate. It can be used to ensure that the certificate name matches the hostname we declare.").Default("").StringVar(&opts.serverName)
kingpin.Flag("consul.timeout", "Timeout on HTTP requests to the Consul API.").Default("500ms").DurationVar(&opts.timeout)
kingpin.Flag("consul.insecure", "Disable TLS host verification.").Default("false").BoolVar(&opts.insecure)
kingpin.Flag("consul.request-limit", "Limit the maximum number of concurrent requests to consul, 0 means no limit.").Default("0").IntVar(&opts.requestLimit)
// Query options.
kingpin.Flag("consul.allow_stale", "Allows any Consul server (non-leader) to service a read.").Default("true").BoolVar(&queryOptions.AllowStale)
kingpin.Flag("consul.require_consistent", "Forces the read to be fully consistent.").Default("false").BoolVar(&queryOptions.RequireConsistent)
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
level.Info(logger).Log("msg", "Starting consul_exporter", "version", version.Info())
level.Info(logger).Log("build_context", version.BuildContext())
exporter, err := NewExporter(opts, *kvPrefix, *kvFilter, *healthSummary, logger)
if err != nil {
level.Error(logger).Log("msg", "Error creating the exporter", "err", err)
os.Exit(1)
}
prometheus.MustRegister(exporter)
queryOptionsJson, err := json.MarshalIndent(queryOptions, "", " ")
if err != nil {
level.Error(logger).Log("msg", "Error marshaling query options", "err", err)
os.Exit(1)
}
http.Handle(*metricsPath,
promhttp.InstrumentMetricHandler(
prometheus.DefaultRegisterer,
promhttp.HandlerFor(
prometheus.DefaultGatherer,
promhttp.HandlerOpts{
ErrorLog: &promHTTPLogger{
logger: logger,
},
},
),
),
)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Consul Exporter</title></head>
<body>
<h1>Consul Exporter</h1>
<p><a href='` + *metricsPath + `'>Metrics</a></p>
<h2>Options</h2>
<pre>` + string(queryOptionsJson) + `</pre>
</dl>
<h2>Build</h2>
<pre>` + version.Info() + ` ` + version.BuildContext() + `</pre>
</body>
</html>`))
})
http.HandleFunc("/-/healthy", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "OK")
})
http.HandleFunc("/-/ready", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "OK")
})
level.Info(logger).Log("msg", "Listening on address", "address", *listenAddress)
if err := http.ListenAndServe(*listenAddress, nil); err != nil {
level.Error(logger).Log("msg", "Error starting HTTP server", "err", err)
os.Exit(1)
}
}