This collector exposes most of the useful information that can be found in /proc/drbd. Sizes are normalised to be in bytes, as /proc/drbd uses kibibytes.pull/365/head
Ed Schouten
8 years ago
parent
ff5b901065
commit
6269f7502a
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// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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// Numerical metric provided by /proc/drbd.
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type drbdNumericalMetric struct {
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desc *prometheus.Desc
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valueType prometheus.ValueType
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multiplier float64
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}
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func newDrbdNumericalMetric(name string, desc string, valueType prometheus.ValueType, multiplier float64) drbdNumericalMetric {
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return drbdNumericalMetric{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "drbd", name),
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desc,
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[]string{"device"}, nil),
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valueType: valueType,
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multiplier: multiplier,
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}
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}
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// String pair metric provided by /proc/drbd.
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type drbdStringPairMetric struct {
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desc *prometheus.Desc
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valueOkay string
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}
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func (metric *drbdStringPairMetric) isOkay(value string) float64 {
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if value == metric.valueOkay {
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return 1
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}
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return 0
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}
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func newDrbdStringPairMetric(name string, desc string, valueOkay string) drbdStringPairMetric {
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return drbdStringPairMetric{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "drbd", name),
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desc,
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[]string{"device", "node"}, nil),
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valueOkay: valueOkay,
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}
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}
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var (
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drbdNumericalMetrics = map[string]drbdNumericalMetric{
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"ns": newDrbdNumericalMetric(
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"network_sent_bytes",
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"Volume of net data sent to the partner via the network connection.",
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prometheus.CounterValue,
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1024),
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"nr": newDrbdNumericalMetric(
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"network_received_bytes",
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"Volume of net data received by the partner via the network connection.",
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prometheus.CounterValue,
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1),
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"dw": newDrbdNumericalMetric(
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"disk_written_bytes",
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"Net data written on local hard disk.",
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prometheus.CounterValue,
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1024),
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"dr": newDrbdNumericalMetric(
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"disk_read_bytes",
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"Net data read from local hard disk.",
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prometheus.CounterValue,
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1024),
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"al": newDrbdNumericalMetric(
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"activitylog_writes",
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"Number of updates of the activity log area of the meta data.",
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prometheus.CounterValue,
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1),
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"bm": newDrbdNumericalMetric(
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"bitmap_writes",
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"Number of updates of the bitmap area of the meta data.",
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prometheus.CounterValue,
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1),
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"lo": newDrbdNumericalMetric(
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"local_pending",
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"Number of open requests to the local I/O sub-system.",
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prometheus.GaugeValue,
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1),
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"pe": newDrbdNumericalMetric(
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"remote_pending",
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"Number of requests sent to the partner, but that have not yet been answered by the latter.",
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prometheus.GaugeValue,
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1),
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"ua": newDrbdNumericalMetric(
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"remote_unacknowledged",
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"Number of requests received by the partner via the network connection, but that have not yet been answered.",
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prometheus.GaugeValue,
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1),
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"ap": newDrbdNumericalMetric(
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"application_pending",
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"Number of block I/O requests forwarded to DRBD, but not yet answered by DRBD.",
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prometheus.GaugeValue,
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1),
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"ep": newDrbdNumericalMetric(
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"epochs",
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"Number of Epochs currently on the fly.",
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prometheus.GaugeValue,
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1),
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"oos": newDrbdNumericalMetric(
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"out_of_sync_bytes",
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"Amount of data known to be out of sync.",
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prometheus.GaugeValue,
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1024),
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}
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drbdStringPairMetrics = map[string]drbdStringPairMetric{
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"ro": newDrbdStringPairMetric(
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"node_role_is_primary",
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"Whether the role of the node is in the primary state.",
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"Primary"),
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"ds": newDrbdStringPairMetric(
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"disk_state_is_up_to_date",
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"Whether the disk of the node is up to date.",
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"UpToDate"),
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}
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drbdConnected = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "drbd", "connected"),
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"Whether DRBD is connected to the partner.",
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[]string{"device"}, nil)
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)
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type drbdCollector struct{}
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func init() {
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Factories["drbd"] = NewDrbdCollector
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}
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func NewDrbdCollector() (Collector, error) {
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return &drbdCollector{}, nil
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}
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func (c *drbdCollector) Update(ch chan<- prometheus.Metric) (err error) {
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statsFile := procFilePath("drbd")
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f, err := os.Open(statsFile)
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if err != nil {
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if os.IsNotExist(err) {
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log.Debugf("Not collecting DRBD statistics, as %s does not exist: %s", statsFile)
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return nil
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}
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return err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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scanner.Split(bufio.ScanWords)
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device := "unknown"
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for scanner.Scan() {
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field := scanner.Text()
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if kv := strings.Split(field, ":"); len(kv) == 2 {
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if id, err := strconv.ParseUint(kv[0], 10, 64); err == nil && kv[1] == "" {
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device = fmt.Sprintf("drbd%d", id)
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} else if metric, ok := drbdNumericalMetrics[kv[0]]; ok {
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// Numerical value.
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value, _ := strconv.ParseFloat(kv[1], 64)
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ch <- prometheus.MustNewConstMetric(
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metric.desc, metric.valueType,
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value*metric.multiplier, device)
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} else if metric, ok := drbdStringPairMetrics[kv[0]]; ok {
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// String pair value.
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values := strings.Split(kv[1], "/")
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ch <- prometheus.MustNewConstMetric(
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metric.desc, prometheus.GaugeValue,
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metric.isOkay(values[0]), device, "local")
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ch <- prometheus.MustNewConstMetric(
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metric.desc, prometheus.GaugeValue,
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metric.isOkay(values[1]), device, "remote")
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} else if kv[0] == "cs" {
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// Connection state.
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var connected float64 = 0
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if kv[1] == "Connected" {
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connected = 1
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}
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ch <- prometheus.MustNewConstMetric(
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drbdConnected, prometheus.GaugeValue,
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connected, device)
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} else {
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log.Infof("Don't know how to process key-value pair [%s: %s]", kv[0], kv[1])
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}
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} else {
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log.Infof("Don't know how to process string %s", field)
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}
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}
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return nil
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}
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@ -0,0 +1,5 @@
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version: 8.4.3 (api:1/proto:86-101)
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srcversion: 1A9F77B1CA5FF92235C2213
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1: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
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ns:17324442 nr:10961011 dw:28263521 dr:118696670 al:1100 bm:221 lo:12345 pe:12346 ua:12347 ap:12348 ep:1 wo:d oos:12349
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