main.go

/*
Copyright 2017 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 (
	"flag"
	"time"

	kube_flag "k8s.io/apiserver/pkg/util/flag"
	"k8s.io/autoscaler/vertical-pod-autoscaler/common"
	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/recommender/input/history"
	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/recommender/routines"
	"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics"
	metrics_recommender "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/recommender"
	"k8s.io/client-go/rest"
	"k8s.io/klog"
)

var (
	metricsFetcherInterval = flag.Duration("recommender-interval", 1*time.Minute, `How often metrics should be fetched`)
	checkpointsGCInterval  = flag.Duration("checkpoints-gc-interval", 10*time.Minute, `How often orphaned checkpoints should be garbage collected`)
	prometheusAddress      = flag.String("prometheus-address", "", `Where to reach for Prometheus metrics`)
	prometheusJobName      = flag.String("prometheus-cadvisor-job-name", "kubernetes-cadvisor", `Name of the prometheus job name which scrapes the cAdvisor metrics`)
	address                = flag.String("address", ":8942", "The address to expose Prometheus metrics.")
	kubeApiQps             = flag.Float64("kube-api-qps", 5.0, `QPS limit when making requests to Kubernetes apiserver`)
	kubeApiBurst           = flag.Float64("kube-api-burst", 10.0, `QPS burst limit when making requests to Kubernetes apiserver`)

	storage = flag.String("storage", "", `Specifies storage mode. Supported values: prometheus, checkpoint (default)`)
	// prometheus history provider configs
	historyLength       = flag.String("history-length", "8d", `How much time back prometheus have to be queried to get historical metrics`)
	podLabelPrefix      = flag.String("pod-label-prefix", "pod_label_", `Which prefix to look for pod labels in metrics`)
	podLabelsMetricName = flag.String("metric-for-pod-labels", "up{job=\"kubernetes-pods\"}", `Which metric to look for pod labels in metrics`)
	podNamespaceLabel   = flag.String("pod-namespace-label", "kubernetes_namespace", `Label name to look for container names`)
	podNameLabel        = flag.String("pod-name-label", "kubernetes_pod_name", `Label name to look for container names`)
	ctrNamespaceLabel   = flag.String("container-namespace-label", "namespace", `Label name to look for container names`)
	ctrPodNameLabel     = flag.String("container-pod-name-label", "pod_name", `Label name to look for container names`)
	ctrNameLabel        = flag.String("container-name-label", "name", `Label name to look for container names`)
)

func main() {
	kube_flag.InitFlags()
	klog.V(1).Infof("Vertical Pod Autoscaler %s Recommender", common.VerticalPodAutoscalerVersion)

	config := createKubeConfig(float32(*kubeApiQps), int(*kubeApiBurst))

	healthCheck := metrics.NewHealthCheck(*metricsFetcherInterval*5, true)
	metrics.Initialize(*address, healthCheck)
	metrics_recommender.Register()

	useCheckpoints := *storage != "prometheus"
	recommender := routines.NewRecommender(config, *checkpointsGCInterval, useCheckpoints)
	if useCheckpoints {
		recommender.GetClusterStateFeeder().InitFromCheckpoints()
	} else {
		config := history.PrometheusHistoryProviderConfig{
			Address:                *prometheusAddress,
			HistoryLength:          *historyLength,
			PodLabelPrefix:         *podLabelPrefix,
			PodLabelsMetricName:    *podLabelsMetricName,
			PodNamespaceLabel:      *podNamespaceLabel,
			PodNameLabel:           *podNameLabel,
			CtrNamespaceLabel:      *ctrNamespaceLabel,
			CtrPodNameLabel:        *ctrPodNameLabel,
			CtrNameLabel:           *ctrNameLabel,
			CadvisorMetricsJobName: *prometheusJobName,
		}
		recommender.GetClusterStateFeeder().InitFromHistoryProvider(history.NewPrometheusHistoryProvider(config))
	}

	ticker := time.Tick(*metricsFetcherInterval)
	for range ticker {
		recommender.RunOnce()
		healthCheck.UpdateLastActivity()
	}

}

func createKubeConfig(kubeApiQps float32, kubeApiBurst int) *rest.Config {
	config, err := rest.InClusterConfig()
	if err != nil {
		klog.Fatalf("Failed to create config: %v", err)
	}
	config.QPS = kubeApiQps
	config.Burst = kubeApiBurst
	return config
}