telegraf/plugins/inputs/docker/docker.go

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package docker
import (
"context"
"encoding/json"
"fmt"
"io"
"log"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
// Docker object
type Docker struct {
Endpoint string
ContainerNames []string
Timeout internal.Duration
PerDevice bool `toml:"perdevice"`
Total bool `toml:"total"`
client *client.Client
engine_host string
testing bool
}
// infoWrapper wraps client.Client.List for testing.
func infoWrapper(c *client.Client, ctx context.Context) (types.Info, error) {
if c != nil {
return c.Info(ctx)
}
fc := FakeDockerClient{}
return fc.Info(ctx)
}
// listWrapper wraps client.Client.ContainerList for testing.
func listWrapper(
c *client.Client,
ctx context.Context,
options types.ContainerListOptions,
) ([]types.Container, error) {
if c != nil {
return c.ContainerList(ctx, options)
}
fc := FakeDockerClient{}
return fc.ContainerList(ctx, options)
}
// statsWrapper wraps client.Client.ContainerStats for testing.
func statsWrapper(
c *client.Client,
ctx context.Context,
containerID string,
stream bool,
) (types.ContainerStats, error) {
if c != nil {
return c.ContainerStats(ctx, containerID, stream)
}
fc := FakeDockerClient{}
return fc.ContainerStats(ctx, containerID, stream)
}
// KB, MB, GB, TB, PB...human friendly
const (
KB = 1000
MB = 1000 * KB
GB = 1000 * MB
TB = 1000 * GB
PB = 1000 * TB
)
var (
sizeRegex = regexp.MustCompile(`^(\d+(\.\d+)*) ?([kKmMgGtTpP])?[bB]?$`)
)
var sampleConfig = `
## Docker Endpoint
## To use TCP, set endpoint = "tcp://[ip]:[port]"
## To use environment variables (ie, docker-machine), set endpoint = "ENV"
endpoint = "unix:///var/run/docker.sock"
## Only collect metrics for these containers, collect all if empty
container_names = []
## Timeout for docker list, info, and stats commands
timeout = "5s"
## Whether to report for each container per-device blkio (8:0, 8:1...) and
## network (eth0, eth1, ...) stats or not
perdevice = true
## Whether to report for each container total blkio and network stats or not
total = false
`
// Description returns input description
func (d *Docker) Description() string {
return "Read metrics about docker containers"
}
// SampleConfig prints sampleConfig
func (d *Docker) SampleConfig() string { return sampleConfig }
// Gather starts stats collection
func (d *Docker) Gather(acc telegraf.Accumulator) error {
if d.client == nil && !d.testing {
var c *client.Client
var err error
defaultHeaders := map[string]string{"User-Agent": "engine-api-cli-1.0"}
if d.Endpoint == "ENV" {
c, err = client.NewEnvClient()
if err != nil {
return err
}
} else if d.Endpoint == "" {
c, err = client.NewClient("unix:///var/run/docker.sock", "", nil, defaultHeaders)
if err != nil {
return err
}
} else {
c, err = client.NewClient(d.Endpoint, "", nil, defaultHeaders)
if err != nil {
return err
}
}
d.client = c
}
// Get daemon info
err := d.gatherInfo(acc)
if err != nil {
fmt.Println(err.Error())
}
// List containers
opts := types.ContainerListOptions{}
ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration)
defer cancel()
containers, err := listWrapper(d.client, ctx, opts)
if err != nil {
return err
}
// Get container data
var wg sync.WaitGroup
wg.Add(len(containers))
for _, container := range containers {
go func(c types.Container) {
defer wg.Done()
err := d.gatherContainer(c, acc)
if err != nil {
log.Printf("E! Error gathering container %s stats: %s\n",
c.Names, err.Error())
}
}(container)
}
wg.Wait()
return nil
}
func (d *Docker) gatherInfo(acc telegraf.Accumulator) error {
// Init vars
dataFields := make(map[string]interface{})
metadataFields := make(map[string]interface{})
now := time.Now()
// Get info from docker daemon
ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration)
defer cancel()
info, err := infoWrapper(d.client, ctx)
if err != nil {
return err
}
d.engine_host = info.Name
fields := map[string]interface{}{
"n_cpus": info.NCPU,
"n_used_file_descriptors": info.NFd,
"n_containers": info.Containers,
"n_containers_running": info.ContainersRunning,
"n_containers_stopped": info.ContainersStopped,
"n_containers_paused": info.ContainersPaused,
"n_images": info.Images,
"n_goroutines": info.NGoroutines,
"n_listener_events": info.NEventsListener,
}
// Add metrics
acc.AddFields("docker",
fields,
map[string]string{"engine_host": d.engine_host},
now)
acc.AddFields("docker",
map[string]interface{}{"memory_total": info.MemTotal},
map[string]string{"unit": "bytes", "engine_host": d.engine_host},
now)
// Get storage metrics
for _, rawData := range info.DriverStatus {
// Try to convert string to int (bytes)
value, err := parseSize(rawData[1])
if err != nil {
continue
}
name := strings.ToLower(strings.Replace(rawData[0], " ", "_", -1))
if name == "pool_blocksize" {
// pool blocksize
acc.AddFields("docker",
map[string]interface{}{"pool_blocksize": value},
map[string]string{"unit": "bytes", "engine_host": d.engine_host},
now)
} else if strings.HasPrefix(name, "data_space_") {
// data space
fieldName := strings.TrimPrefix(name, "data_space_")
dataFields[fieldName] = value
} else if strings.HasPrefix(name, "metadata_space_") {
// metadata space
fieldName := strings.TrimPrefix(name, "metadata_space_")
metadataFields[fieldName] = value
}
}
if len(dataFields) > 0 {
acc.AddFields("docker_data",
dataFields,
map[string]string{"unit": "bytes", "engine_host": d.engine_host},
now)
}
if len(metadataFields) > 0 {
acc.AddFields("docker_metadata",
metadataFields,
map[string]string{"unit": "bytes", "engine_host": d.engine_host},
now)
}
return nil
}
func (d *Docker) gatherContainer(
container types.Container,
acc telegraf.Accumulator,
) error {
var v *types.StatsJSON
// Parse container name
cname := "unknown"
if len(container.Names) > 0 {
// Not sure what to do with other names, just take the first.
cname = strings.TrimPrefix(container.Names[0], "/")
}
// the image name sometimes has a version part, or a private repo
// ie, rabbitmq:3-management or docker.someco.net:4443/rabbitmq:3-management
imageName := ""
imageVersion := "unknown"
i := strings.LastIndex(container.Image, ":") // index of last ':' character
if i > -1 {
imageVersion = container.Image[i+1:]
imageName = container.Image[:i]
} else {
imageName = container.Image
}
tags := map[string]string{
"engine_host": d.engine_host,
"container_name": cname,
"container_image": imageName,
"container_version": imageVersion,
}
if len(d.ContainerNames) > 0 {
if !sliceContains(cname, d.ContainerNames) {
return nil
}
}
ctx, cancel := context.WithTimeout(context.Background(), d.Timeout.Duration)
defer cancel()
r, err := statsWrapper(d.client, ctx, container.ID, false)
if err != nil {
return fmt.Errorf("Error getting docker stats: %s", err.Error())
}
defer r.Body.Close()
dec := json.NewDecoder(r.Body)
if err = dec.Decode(&v); err != nil {
if err == io.EOF {
return nil
}
return fmt.Errorf("Error decoding: %s", err.Error())
}
// Add labels to tags
for k, label := range container.Labels {
tags[k] = label
}
gatherContainerStats(v, acc, tags, container.ID, d.PerDevice, d.Total)
return nil
}
func gatherContainerStats(
stat *types.StatsJSON,
acc telegraf.Accumulator,
tags map[string]string,
id string,
perDevice bool,
total bool,
) {
now := stat.Read
memfields := map[string]interface{}{
"max_usage": stat.MemoryStats.MaxUsage,
"usage": stat.MemoryStats.Usage,
"fail_count": stat.MemoryStats.Failcnt,
"limit": stat.MemoryStats.Limit,
"total_pgmafault": stat.MemoryStats.Stats["total_pgmajfault"],
"cache": stat.MemoryStats.Stats["cache"],
"mapped_file": stat.MemoryStats.Stats["mapped_file"],
"total_inactive_file": stat.MemoryStats.Stats["total_inactive_file"],
"pgpgout": stat.MemoryStats.Stats["pagpgout"],
"rss": stat.MemoryStats.Stats["rss"],
"total_mapped_file": stat.MemoryStats.Stats["total_mapped_file"],
"writeback": stat.MemoryStats.Stats["writeback"],
"unevictable": stat.MemoryStats.Stats["unevictable"],
"pgpgin": stat.MemoryStats.Stats["pgpgin"],
"total_unevictable": stat.MemoryStats.Stats["total_unevictable"],
"pgmajfault": stat.MemoryStats.Stats["pgmajfault"],
"total_rss": stat.MemoryStats.Stats["total_rss"],
"total_rss_huge": stat.MemoryStats.Stats["total_rss_huge"],
"total_writeback": stat.MemoryStats.Stats["total_write_back"],
"total_inactive_anon": stat.MemoryStats.Stats["total_inactive_anon"],
"rss_huge": stat.MemoryStats.Stats["rss_huge"],
"hierarchical_memory_limit": stat.MemoryStats.Stats["hierarchical_memory_limit"],
"total_pgfault": stat.MemoryStats.Stats["total_pgfault"],
"total_active_file": stat.MemoryStats.Stats["total_active_file"],
"active_anon": stat.MemoryStats.Stats["active_anon"],
"total_active_anon": stat.MemoryStats.Stats["total_active_anon"],
"total_pgpgout": stat.MemoryStats.Stats["total_pgpgout"],
"total_cache": stat.MemoryStats.Stats["total_cache"],
"inactive_anon": stat.MemoryStats.Stats["inactive_anon"],
"active_file": stat.MemoryStats.Stats["active_file"],
"pgfault": stat.MemoryStats.Stats["pgfault"],
"inactive_file": stat.MemoryStats.Stats["inactive_file"],
"total_pgpgin": stat.MemoryStats.Stats["total_pgpgin"],
"usage_percent": calculateMemPercent(stat),
"container_id": id,
}
acc.AddFields("docker_container_mem", memfields, tags, now)
cpufields := map[string]interface{}{
"usage_total": stat.CPUStats.CPUUsage.TotalUsage,
"usage_in_usermode": stat.CPUStats.CPUUsage.UsageInUsermode,
"usage_in_kernelmode": stat.CPUStats.CPUUsage.UsageInKernelmode,
"usage_system": stat.CPUStats.SystemUsage,
"throttling_periods": stat.CPUStats.ThrottlingData.Periods,
"throttling_throttled_periods": stat.CPUStats.ThrottlingData.ThrottledPeriods,
"throttling_throttled_time": stat.CPUStats.ThrottlingData.ThrottledTime,
"usage_percent": calculateCPUPercent(stat),
"container_id": id,
}
cputags := copyTags(tags)
cputags["cpu"] = "cpu-total"
acc.AddFields("docker_container_cpu", cpufields, cputags, now)
for i, percpu := range stat.CPUStats.CPUUsage.PercpuUsage {
percputags := copyTags(tags)
percputags["cpu"] = fmt.Sprintf("cpu%d", i)
fields := map[string]interface{}{
"usage_total": percpu,
"container_id": id,
}
acc.AddFields("docker_container_cpu", fields, percputags, now)
}
totalNetworkStatMap := make(map[string]interface{})
for network, netstats := range stat.Networks {
netfields := map[string]interface{}{
"rx_dropped": netstats.RxDropped,
"rx_bytes": netstats.RxBytes,
"rx_errors": netstats.RxErrors,
"tx_packets": netstats.TxPackets,
"tx_dropped": netstats.TxDropped,
"rx_packets": netstats.RxPackets,
"tx_errors": netstats.TxErrors,
"tx_bytes": netstats.TxBytes,
"container_id": id,
}
// Create a new network tag dictionary for the "network" tag
if perDevice {
nettags := copyTags(tags)
nettags["network"] = network
acc.AddFields("docker_container_net", netfields, nettags, now)
}
if total {
for field, value := range netfields {
if field == "container_id" {
continue
}
var uintV uint64
switch v := value.(type) {
case uint64:
uintV = v
case int64:
uintV = uint64(v)
default:
continue
}
_, ok := totalNetworkStatMap[field]
if ok {
totalNetworkStatMap[field] = totalNetworkStatMap[field].(uint64) + uintV
} else {
totalNetworkStatMap[field] = uintV
}
}
}
}
// totalNetworkStatMap could be empty if container is running with --net=host.
if total && len(totalNetworkStatMap) != 0 {
nettags := copyTags(tags)
nettags["network"] = "total"
totalNetworkStatMap["container_id"] = id
acc.AddFields("docker_container_net", totalNetworkStatMap, nettags, now)
}
gatherBlockIOMetrics(stat, acc, tags, now, id, perDevice, total)
}
func calculateMemPercent(stat *types.StatsJSON) float64 {
var memPercent = 0.0
if stat.MemoryStats.Limit > 0 {
memPercent = float64(stat.MemoryStats.Usage) / float64(stat.MemoryStats.Limit) * 100.0
}
return memPercent
}
func calculateCPUPercent(stat *types.StatsJSON) float64 {
var cpuPercent = 0.0
// calculate the change for the cpu and system usage of the container in between readings
cpuDelta := float64(stat.CPUStats.CPUUsage.TotalUsage) - float64(stat.PreCPUStats.CPUUsage.TotalUsage)
systemDelta := float64(stat.CPUStats.SystemUsage) - float64(stat.PreCPUStats.SystemUsage)
if systemDelta > 0.0 && cpuDelta > 0.0 {
cpuPercent = (cpuDelta / systemDelta) * float64(len(stat.CPUStats.CPUUsage.PercpuUsage)) * 100.0
}
return cpuPercent
}
func gatherBlockIOMetrics(
stat *types.StatsJSON,
acc telegraf.Accumulator,
tags map[string]string,
now time.Time,
id string,
perDevice bool,
total bool,
) {
blkioStats := stat.BlkioStats
// Make a map of devices to their block io stats
deviceStatMap := make(map[string]map[string]interface{})
for _, metric := range blkioStats.IoServiceBytesRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
_, ok := deviceStatMap[device]
if !ok {
deviceStatMap[device] = make(map[string]interface{})
}
field := fmt.Sprintf("io_service_bytes_recursive_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoServicedRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
_, ok := deviceStatMap[device]
if !ok {
deviceStatMap[device] = make(map[string]interface{})
}
field := fmt.Sprintf("io_serviced_recursive_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoQueuedRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
field := fmt.Sprintf("io_queue_recursive_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoServiceTimeRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
field := fmt.Sprintf("io_service_time_recursive_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoWaitTimeRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
field := fmt.Sprintf("io_wait_time_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoMergedRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
field := fmt.Sprintf("io_merged_recursive_%s", strings.ToLower(metric.Op))
deviceStatMap[device][field] = metric.Value
}
for _, metric := range blkioStats.IoTimeRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
deviceStatMap[device]["io_time_recursive"] = metric.Value
}
for _, metric := range blkioStats.SectorsRecursive {
device := fmt.Sprintf("%d:%d", metric.Major, metric.Minor)
deviceStatMap[device]["sectors_recursive"] = metric.Value
}
totalStatMap := make(map[string]interface{})
for device, fields := range deviceStatMap {
fields["container_id"] = id
if perDevice {
iotags := copyTags(tags)
iotags["device"] = device
acc.AddFields("docker_container_blkio", fields, iotags, now)
}
if total {
for field, value := range fields {
if field == "container_id" {
continue
}
var uintV uint64
switch v := value.(type) {
case uint64:
uintV = v
case int64:
uintV = uint64(v)
default:
continue
}
_, ok := totalStatMap[field]
if ok {
totalStatMap[field] = totalStatMap[field].(uint64) + uintV
} else {
totalStatMap[field] = uintV
}
}
}
}
if total {
totalStatMap["container_id"] = id
iotags := copyTags(tags)
iotags["device"] = "total"
acc.AddFields("docker_container_blkio", totalStatMap, iotags, now)
}
}
func copyTags(in map[string]string) map[string]string {
out := make(map[string]string)
for k, v := range in {
out[k] = v
}
return out
}
func sliceContains(in string, sl []string) bool {
for _, str := range sl {
if str == in {
return true
}
}
return false
}
// Parses the human-readable size string into the amount it represents.
func parseSize(sizeStr string) (int64, error) {
matches := sizeRegex.FindStringSubmatch(sizeStr)
if len(matches) != 4 {
return -1, fmt.Errorf("invalid size: '%s'", sizeStr)
}
size, err := strconv.ParseFloat(matches[1], 64)
if err != nil {
return -1, err
}
uMap := map[string]int64{"k": KB, "m": MB, "g": GB, "t": TB, "p": PB}
unitPrefix := strings.ToLower(matches[3])
if mul, ok := uMap[unitPrefix]; ok {
size *= float64(mul)
}
return int64(size), nil
}
func init() {
inputs.Add("docker", func() telegraf.Input {
return &Docker{
PerDevice: true,
Timeout: internal.Duration{Duration: time.Second * 5},
}
})
}