telegraf/plugins/inputs/kubernetes/kubernetes.go

256 lines
8.7 KiB
Go

package kubernetes
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/tls"
"github.com/influxdata/telegraf/plugins/inputs"
)
// Kubernetes represents the config object for the plugin
type Kubernetes struct {
URL string
// Bearer Token authorization file path
BearerToken string `toml:"bearer_token"`
BearerTokenString string `toml:"bearer_token_string"`
// HTTP Timeout specified as a string - 3s, 1m, 1h
ResponseTimeout internal.Duration
tls.ClientConfig
RoundTripper http.RoundTripper
}
var sampleConfig = `
## URL for the kubelet
url = "http://127.0.0.1:10255"
## Use bearer token for authorization. ('bearer_token' takes priority)
## If both of these are empty, we'll use the default serviceaccount:
## at: /run/secrets/kubernetes.io/serviceaccount/token
# bearer_token = "/path/to/bearer/token"
## OR
# bearer_token_string = "abc_123"
## Set response_timeout (default 5 seconds)
# response_timeout = "5s"
## Optional TLS Config
# tls_ca = /path/to/cafile
# tls_cert = /path/to/certfile
# tls_key = /path/to/keyfile
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
`
const (
summaryEndpoint = `%s/stats/summary`
defaultServiceAccountPath = "/run/secrets/kubernetes.io/serviceaccount/token"
)
func init() {
inputs.Add("kubernetes", func() telegraf.Input {
return &Kubernetes{}
})
}
//SampleConfig returns a sample config
func (k *Kubernetes) SampleConfig() string {
return sampleConfig
}
//Description returns the description of this plugin
func (k *Kubernetes) Description() string {
return "Read metrics from the kubernetes kubelet api"
}
func (k *Kubernetes) Init() error {
// If neither are provided, use the default service account.
if k.BearerToken == "" && k.BearerTokenString == "" {
k.BearerToken = defaultServiceAccountPath
}
if k.BearerToken != "" {
token, err := ioutil.ReadFile(k.BearerToken)
if err != nil {
return err
}
k.BearerTokenString = strings.TrimSpace(string(token))
}
return nil
}
//Gather collects kubernetes metrics from a given URL
func (k *Kubernetes) Gather(acc telegraf.Accumulator) error {
acc.AddError(k.gatherSummary(k.URL, acc))
return nil
}
func buildURL(endpoint string, base string) (*url.URL, error) {
u := fmt.Sprintf(endpoint, base)
addr, err := url.Parse(u)
if err != nil {
return nil, fmt.Errorf("Unable to parse address '%s': %s", u, err)
}
return addr, nil
}
func (k *Kubernetes) gatherSummary(baseURL string, acc telegraf.Accumulator) error {
url := fmt.Sprintf("%s/stats/summary", baseURL)
var req, err = http.NewRequest("GET", url, nil)
var resp *http.Response
tlsCfg, err := k.ClientConfig.TLSConfig()
if err != nil {
return err
}
if k.RoundTripper == nil {
// Set default values
if k.ResponseTimeout.Duration < time.Second {
k.ResponseTimeout.Duration = time.Second * 5
}
k.RoundTripper = &http.Transport{
TLSHandshakeTimeout: 5 * time.Second,
TLSClientConfig: tlsCfg,
ResponseHeaderTimeout: k.ResponseTimeout.Duration,
}
}
req.Header.Set("Authorization", "Bearer "+k.BearerTokenString)
req.Header.Add("Accept", "application/json")
resp, err = k.RoundTripper.RoundTrip(req)
if err != nil {
return fmt.Errorf("error making HTTP request to %s: %s", url, err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned HTTP status %s", url, resp.Status)
}
summaryMetrics := &SummaryMetrics{}
err = json.NewDecoder(resp.Body).Decode(summaryMetrics)
if err != nil {
return fmt.Errorf(`Error parsing response: %s`, err)
}
buildSystemContainerMetrics(summaryMetrics, acc)
buildNodeMetrics(summaryMetrics, acc)
buildPodMetrics(summaryMetrics, acc)
return nil
}
func buildSystemContainerMetrics(summaryMetrics *SummaryMetrics, acc telegraf.Accumulator) {
for _, container := range summaryMetrics.Node.SystemContainers {
tags := map[string]string{
"node_name": summaryMetrics.Node.NodeName,
"container_name": container.Name,
}
fields := make(map[string]interface{})
fields["cpu_usage_nanocores"] = container.CPU.UsageNanoCores
fields["cpu_usage_core_nanoseconds"] = container.CPU.UsageCoreNanoSeconds
fields["memory_usage_bytes"] = container.Memory.UsageBytes
fields["memory_working_set_bytes"] = container.Memory.WorkingSetBytes
fields["memory_rss_bytes"] = container.Memory.RSSBytes
fields["memory_page_faults"] = container.Memory.PageFaults
fields["memory_major_page_faults"] = container.Memory.MajorPageFaults
fields["rootfs_available_bytes"] = container.RootFS.AvailableBytes
fields["rootfs_capacity_bytes"] = container.RootFS.CapacityBytes
fields["logsfs_available_bytes"] = container.LogsFS.AvailableBytes
fields["logsfs_capacity_bytes"] = container.LogsFS.CapacityBytes
acc.AddFields("kubernetes_system_container", fields, tags)
}
}
func buildNodeMetrics(summaryMetrics *SummaryMetrics, acc telegraf.Accumulator) {
tags := map[string]string{
"node_name": summaryMetrics.Node.NodeName,
}
fields := make(map[string]interface{})
fields["cpu_usage_nanocores"] = summaryMetrics.Node.CPU.UsageNanoCores
fields["cpu_usage_core_nanoseconds"] = summaryMetrics.Node.CPU.UsageCoreNanoSeconds
fields["memory_available_bytes"] = summaryMetrics.Node.Memory.AvailableBytes
fields["memory_usage_bytes"] = summaryMetrics.Node.Memory.UsageBytes
fields["memory_working_set_bytes"] = summaryMetrics.Node.Memory.WorkingSetBytes
fields["memory_rss_bytes"] = summaryMetrics.Node.Memory.RSSBytes
fields["memory_page_faults"] = summaryMetrics.Node.Memory.PageFaults
fields["memory_major_page_faults"] = summaryMetrics.Node.Memory.MajorPageFaults
fields["network_rx_bytes"] = summaryMetrics.Node.Network.RXBytes
fields["network_rx_errors"] = summaryMetrics.Node.Network.RXErrors
fields["network_tx_bytes"] = summaryMetrics.Node.Network.TXBytes
fields["network_tx_errors"] = summaryMetrics.Node.Network.TXErrors
fields["fs_available_bytes"] = summaryMetrics.Node.FileSystem.AvailableBytes
fields["fs_capacity_bytes"] = summaryMetrics.Node.FileSystem.CapacityBytes
fields["fs_used_bytes"] = summaryMetrics.Node.FileSystem.UsedBytes
fields["runtime_image_fs_available_bytes"] = summaryMetrics.Node.Runtime.ImageFileSystem.AvailableBytes
fields["runtime_image_fs_capacity_bytes"] = summaryMetrics.Node.Runtime.ImageFileSystem.CapacityBytes
fields["runtime_image_fs_used_bytes"] = summaryMetrics.Node.Runtime.ImageFileSystem.UsedBytes
acc.AddFields("kubernetes_node", fields, tags)
}
func buildPodMetrics(summaryMetrics *SummaryMetrics, acc telegraf.Accumulator) {
for _, pod := range summaryMetrics.Pods {
for _, container := range pod.Containers {
tags := map[string]string{
"node_name": summaryMetrics.Node.NodeName,
"namespace": pod.PodRef.Namespace,
"container_name": container.Name,
"pod_name": pod.PodRef.Name,
}
fields := make(map[string]interface{})
fields["cpu_usage_nanocores"] = container.CPU.UsageNanoCores
fields["cpu_usage_core_nanoseconds"] = container.CPU.UsageCoreNanoSeconds
fields["memory_usage_bytes"] = container.Memory.UsageBytes
fields["memory_working_set_bytes"] = container.Memory.WorkingSetBytes
fields["memory_rss_bytes"] = container.Memory.RSSBytes
fields["memory_page_faults"] = container.Memory.PageFaults
fields["memory_major_page_faults"] = container.Memory.MajorPageFaults
fields["rootfs_available_bytes"] = container.RootFS.AvailableBytes
fields["rootfs_capacity_bytes"] = container.RootFS.CapacityBytes
fields["rootfs_used_bytes"] = container.RootFS.UsedBytes
fields["logsfs_available_bytes"] = container.LogsFS.AvailableBytes
fields["logsfs_capacity_bytes"] = container.LogsFS.CapacityBytes
fields["logsfs_used_bytes"] = container.LogsFS.UsedBytes
acc.AddFields("kubernetes_pod_container", fields, tags)
}
for _, volume := range pod.Volumes {
tags := map[string]string{
"node_name": summaryMetrics.Node.NodeName,
"pod_name": pod.PodRef.Name,
"namespace": pod.PodRef.Namespace,
"volume_name": volume.Name,
}
fields := make(map[string]interface{})
fields["available_bytes"] = volume.AvailableBytes
fields["capacity_bytes"] = volume.CapacityBytes
fields["used_bytes"] = volume.UsedBytes
acc.AddFields("kubernetes_pod_volume", fields, tags)
}
tags := map[string]string{
"node_name": summaryMetrics.Node.NodeName,
"pod_name": pod.PodRef.Name,
"namespace": pod.PodRef.Namespace,
}
fields := make(map[string]interface{})
fields["rx_bytes"] = pod.Network.RXBytes
fields["rx_errors"] = pod.Network.RXErrors
fields["tx_bytes"] = pod.Network.TXBytes
fields["tx_errors"] = pod.Network.TXErrors
acc.AddFields("kubernetes_pod_network", fields, tags)
}
}