Add available_entropy field to kernel input plugin (#3524)
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@ -4,11 +4,17 @@ This plugin is only available on Linux.
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The kernel plugin gathers info about the kernel that doesn't fit into other
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plugins. In general, it is the statistics available in `/proc/stat` that are
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not covered by other plugins.
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not covered by other plugins as well as the value of `/proc/sys/kernel/random/entropy_avail`
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The metrics are documented in `man proc` under the `/proc/stat` section.
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The metrics are documented in `man 4 random` under the `/proc/stat` section.
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```
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/proc/sys/kernel/random/entropy_avail
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Contains the value of available entropy
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/proc/stat
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kernel/system statistics. Varies with architecture. Common entries include:
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@ -50,6 +56,7 @@ Number of forks since boot.
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- disk_pages_out (integer, `page (1)`)
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- interrupts (integer, `intr`)
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- processes_forked (integer, `processes`)
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- entropy_avail (integer, `entropy_available`)
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### Tags:
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@ -60,5 +67,5 @@ None
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```
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$ telegraf --config ~/ws/telegraf.conf --input-filter kernel --test
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* Plugin: kernel, Collection 1
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> kernel boot_time=1457505775i,context_switches=2626618i,disk_pages_in=5741i,disk_pages_out=1808i,interrupts=1472736i,processes_forked=10673i 1457613402960879816
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> kernel entropy_available=2469i,boot_time=1457505775i,context_switches=2626618i,disk_pages_in=5741i,disk_pages_out=1808i,interrupts=1472736i,processes_forked=10673i 1457613402960879816
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```
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@ -8,6 +8,7 @@ import (
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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@ -23,7 +24,8 @@ var (
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)
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type Kernel struct {
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statFile string
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statFile string
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entropyStatFile string
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}
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func (k *Kernel) Description() string {
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@ -33,13 +35,27 @@ func (k *Kernel) Description() string {
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func (k *Kernel) SampleConfig() string { return "" }
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func (k *Kernel) Gather(acc telegraf.Accumulator) error {
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data, err := k.getProcStat()
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if err != nil {
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return err
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}
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entropyData, err := ioutil.ReadFile(k.entropyStatFile)
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if err != nil {
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return err
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}
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entropyString := string(entropyData)
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entropyValue, err := strconv.ParseInt(strings.TrimSpace(entropyString), 10, 64)
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if err != nil {
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return err
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}
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fields := make(map[string]interface{})
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fields["entropy_avail"] = int64(entropyValue)
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dataFields := bytes.Fields(data)
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for i, field := range dataFields {
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switch {
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@ -104,7 +120,8 @@ func (k *Kernel) getProcStat() ([]byte, error) {
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func init() {
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inputs.Add("kernel", func() telegraf.Input {
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return &Kernel{
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statFile: "/proc/stat",
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statFile: "/proc/stat",
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entropyStatFile: "/proc/sys/kernel/random/entropy_avail",
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}
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})
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}
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@ -14,10 +14,13 @@ import (
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func TestFullProcFile(t *testing.T) {
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tmpfile := makeFakeStatFile([]byte(statFile_Full))
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tmpfile2 := makeFakeStatFile([]byte(entropyStatFile_Full))
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defer os.Remove(tmpfile)
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defer os.Remove(tmpfile2)
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k := Kernel{
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statFile: tmpfile,
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statFile: tmpfile,
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entropyStatFile: tmpfile2,
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}
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acc := testutil.Accumulator{}
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@ -31,16 +34,20 @@ func TestFullProcFile(t *testing.T) {
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"disk_pages_out": int64(1808),
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"interrupts": int64(1472736),
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"processes_forked": int64(10673),
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"entropy_avail": int64(1024),
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}
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acc.AssertContainsFields(t, "kernel", fields)
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}
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func TestPartialProcFile(t *testing.T) {
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tmpfile := makeFakeStatFile([]byte(statFile_Partial))
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tmpfile2 := makeFakeStatFile([]byte(entropyStatFile_Partial))
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defer os.Remove(tmpfile)
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defer os.Remove(tmpfile2)
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k := Kernel{
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statFile: tmpfile,
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statFile: tmpfile,
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entropyStatFile: tmpfile2,
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}
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acc := testutil.Accumulator{}
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@ -53,16 +60,20 @@ func TestPartialProcFile(t *testing.T) {
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"disk_pages_in": int64(5741),
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"disk_pages_out": int64(1808),
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"interrupts": int64(1472736),
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"entropy_avail": int64(1024),
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}
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acc.AssertContainsFields(t, "kernel", fields)
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}
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func TestInvalidProcFile1(t *testing.T) {
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tmpfile := makeFakeStatFile([]byte(statFile_Invalid))
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tmpfile2 := makeFakeStatFile([]byte(entropyStatFile_Invalid))
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defer os.Remove(tmpfile)
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defer os.Remove(tmpfile2)
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k := Kernel{
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statFile: tmpfile,
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statFile: tmpfile,
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entropyStatFile: tmpfile2,
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}
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acc := testutil.Accumulator{}
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@ -108,6 +119,7 @@ procs_blocked 0
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softirq 1031662 0 649485 20946 111071 11620 0 1 0 994 237545
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page 5741 1808
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swap 1 0
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entropy_avail 1024
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`
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const statFile_Partial = `cpu 6796 252 5655 10444977 175 0 101 0 0 0
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@ -133,6 +145,7 @@ procs_blocked 0
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softirq 1031662 0 649485 20946 111071 11620 0 1 0 994 237545
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page 5741 1808
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swap 1 0
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entropy_avail 1024
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`
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// missing second page measurement
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@ -145,8 +158,15 @@ procs_running 2
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page 5741
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procs_blocked 0
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softirq 1031662 0 649485 20946 111071 11620 0 1 0 994 237545
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entropy_avail 1024 2048
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`
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const entropyStatFile_Full = `1024`
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const entropyStatFile_Partial = `1024`
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const entropyStatFile_Invalid = ``
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func makeFakeStatFile(content []byte) string {
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tmpfile, err := ioutil.TempFile("", "kerneltest")
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if err != nil {
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