node_exporter/collector/filesystem.go

124 lines
3.1 KiB
Go

// +build !nofilesystem
package collector
import (
"bufio"
"flag"
"fmt"
"os"
"regexp"
"strings"
"syscall"
"github.com/golang/glog"
"github.com/prometheus/client_golang/prometheus"
)
const (
procMounts = "/proc/mounts"
)
var (
fsSizeMetric = prometheus.NewGauge()
fsFreeMetric = prometheus.NewGauge()
fsAvailMetric = prometheus.NewGauge()
fsFilesMetric = prometheus.NewGauge()
fsFilesFreeMetric = prometheus.NewGauge()
ignoredMountPoints = flag.String("filesystemIgnoredMountPoints", "^/(sys|proc|dev)($|/)", "Regexp of mount points to ignore for filesystem collector.")
)
type filesystemCollector struct {
registry prometheus.Registry
config Config
ignoredMountPointsPattern *regexp.Regexp
}
func init() {
Factories["filesystem"] = NewFilesystemCollector
}
// Takes a config struct and prometheus registry and returns a new Collector exposing
// network device filesystems.
func NewFilesystemCollector(config Config, registry prometheus.Registry) (Collector, error) {
c := filesystemCollector{
config: config,
registry: registry,
ignoredMountPointsPattern: regexp.MustCompile(*ignoredMountPoints),
}
registry.Register(
"node_filesystem_size",
"Filesystem size in bytes.",
prometheus.NilLabels,
fsSizeMetric,
)
registry.Register(
"node_filesystem_free",
"Filesystem free space in bytes.",
prometheus.NilLabels,
fsFreeMetric,
)
registry.Register(
"node_filesystem_avail",
"Filesystem space available to non-root users in bytes.",
prometheus.NilLabels,
fsAvailMetric,
)
registry.Register(
"node_filesystem_files",
"Filesystem total file nodes.",
prometheus.NilLabels,
fsFilesMetric,
)
registry.Register(
"node_filesystem_files_free",
"Filesystem total free file nodes.",
prometheus.NilLabels,
fsFilesFreeMetric,
)
return &c, nil
}
// Expose filesystem fullness.
func (c *filesystemCollector) Update() (updates int, err error) {
mps, err := mountPoints()
if err != nil {
return updates, err
}
for _, mp := range mps {
if c.ignoredMountPointsPattern.MatchString(mp) {
glog.V(1).Infof("Ignoring mount point: %s", mp)
continue
}
buf := new(syscall.Statfs_t)
err := syscall.Statfs(mp, buf)
if err != nil {
return updates, fmt.Errorf("Statfs on %s returned %s", mp, err)
}
fsSizeMetric.Set(map[string]string{"filesystem": mp}, float64(buf.Blocks)*float64(buf.Bsize))
fsFreeMetric.Set(map[string]string{"filesystem": mp}, float64(buf.Bfree)*float64(buf.Bsize))
fsAvailMetric.Set(map[string]string{"filesystem": mp}, float64(buf.Bavail)*float64(buf.Bsize))
fsFilesMetric.Set(map[string]string{"filesystem": mp}, float64(buf.Files))
fsFilesFreeMetric.Set(map[string]string{"filesystem": mp}, float64(buf.Ffree))
updates++
}
return updates, err
}
func mountPoints() ([]string, error) {
file, err := os.Open(procMounts)
if err != nil {
return nil, err
}
defer file.Close()
mountPoints := []string{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
mountPoints = append(mountPoints, parts[1])
}
return mountPoints, nil
}