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main.go
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main.go
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// I COPIED THIS FROM THE KUBELET SOURCE CODE
// AND MODIFIED SOME PARTS. ghokun
/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"fmt"
"log"
"os"
"path/filepath"
"time"
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"k8s.io/klog/v2"
pluginapi "k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1"
podresourcesv1 "k8s.io/kubelet/pkg/apis/podresources/v1"
"k8s.io/kubernetes/pkg/kubelet/apis/podresources"
dm "k8s.io/kubernetes/pkg/kubelet/cm/devicemanager"
)
const (
resourceName = "example.com/resource"
grpcAddress = "unix:///var/lib/kubelet/pod-resources/kubelet.sock"
grpcBufferSize = 4 * 1024 * 1024
grpcTimeout = 5 * time.Second
scrapeInterval = 10 * time.Second
)
var (
devs = []*pluginapi.Device{
{ID: "Dev_1", Health: pluginapi.Healthy},
{ID: "Dev_2", Health: pluginapi.Healthy},
{ID: "Dev_3", Health: pluginapi.Healthy},
{ID: "Dev_4", Health: pluginapi.Healthy},
}
metrics = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Name: "pods_per_devices",
Help: "Total number of pods per device",
}, []string{"device", "pods"})
)
func updateMetrics() {
resListerClient, clientConn, err := podresources.GetV1Client(grpcAddress, grpcTimeout, grpcBufferSize)
defer clientConn.Close()
if err != nil {
panic(err)
}
for {
metrics.Reset()
resp, err := resListerClient.List(context.Background(), &podresourcesv1.ListPodResourcesRequest{})
if err != nil {
klog.Errorf("failed to list pod resources: %v", err)
}
if len(resp.PodResources) <= 0 {
klog.Infof("No pods using resource %s", resourceName)
}
for _, podRes := range resp.PodResources { // for each pod
for _, contRes := range podRes.Containers { // for each container
for _, contDevices := range contRes.Devices { // for each device
if contDevices.ResourceName == resourceName {
for _, deviceId := range contDevices.DeviceIds { // for each device id
metrics.WithLabelValues(deviceId, podRes.Name).Set(1)
klog.Infof("Pod %s using device %s", podRes.Name, deviceId)
}
}
}
}
}
time.Sleep(scrapeInterval)
}
}
// stubAllocFunc creates and returns allocation response for the input allocate request
func stubAllocFunc(r *pluginapi.AllocateRequest, devs map[string]pluginapi.Device) (*pluginapi.AllocateResponse, error) {
var responses pluginapi.AllocateResponse
for _, req := range r.ContainerRequests {
response := &pluginapi.ContainerAllocateResponse{}
for _, requestID := range req.DevicesIDs {
dev, ok := devs[requestID]
if !ok {
return nil, fmt.Errorf("invalid allocation request with non-existing device %s", requestID)
}
if dev.Health != pluginapi.Healthy {
return nil, fmt.Errorf("invalid allocation request with unhealthy device: %s", requestID)
}
// create fake device file
fpath := filepath.Join("/tmp", dev.ID)
// clean first
if err := os.RemoveAll(fpath); err != nil {
return nil, fmt.Errorf("failed to clean fake device file from previous run: %s", err)
}
f, err := os.Create(fpath)
if err != nil && !os.IsExist(err) {
return nil, fmt.Errorf("failed to create fake device file: %s", err)
}
f.Close()
response.Envs = map[string]string{}
response.Envs["fpath"] = fpath
response.Annotations = map[string]string{}
response.Annotations["fpath"] = fpath
response.Mounts = append(response.Mounts, &pluginapi.Mount{
ContainerPath: fpath,
HostPath: fpath,
})
}
responses.ContainerResponses = append(responses.ContainerResponses, response)
}
return &responses, nil
}
func main() {
pluginSocksDir := pluginapi.DevicePluginPath //os.Getenv("PLUGIN_SOCK_DIR")
klog.Infof("pluginSocksDir: %s", pluginSocksDir)
if pluginSocksDir == "" {
klog.Errorf("Empty pluginSocksDir")
return
}
socketPath := pluginSocksDir + "dp." + fmt.Sprintf("%d", time.Now().Unix())
dp1 := dm.NewDevicePluginStub(devs, socketPath, resourceName, false, false)
if err := dp1.Start(); err != nil {
panic(err)
}
dp1.SetAllocFunc(stubAllocFunc)
if err := dp1.Register(pluginapi.KubeletSocket, resourceName, pluginapi.DevicePluginPath); err != nil {
panic(err)
}
r := prometheus.NewRegistry()
r.MustRegister(metrics)
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.HandlerFor(r, promhttp.HandlerOpts{}))
srv := &http.Server{Addr: ":2112", Handler: mux}
go updateMetrics()
log.Fatal(srv.ListenAndServe())
}