015bc3b7bd
It currently is impossible to use two healthz handlers on different ports in the same process. This removes the global variables in favor of requiring the consumer to specify all health checks up front.
130 lines
4.4 KiB
Go
130 lines
4.4 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package app implements a Server object for running the scheduler.
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package app
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import (
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/http/pprof"
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"os"
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"strconv"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client/record"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/master/ports"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler"
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_ "github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/algorithmprovider"
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schedulerapi "github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/api"
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latestschedulerapi "github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/api/latest"
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"github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/factory"
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"github.com/golang/glog"
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"github.com/spf13/pflag"
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)
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// SchedulerServer has all the context and params needed to run a Scheduler
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type SchedulerServer struct {
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Port int
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Address util.IP
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ClientConfig client.Config
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AlgorithmProvider string
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PolicyConfigFile string
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EnableProfiling bool
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}
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// NewSchedulerServer creates a new SchedulerServer with default parameters
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func NewSchedulerServer() *SchedulerServer {
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s := SchedulerServer{
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Port: ports.SchedulerPort,
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Address: util.IP(net.ParseIP("127.0.0.1")),
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AlgorithmProvider: factory.DefaultProvider,
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}
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return &s
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}
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// AddFlags adds flags for a specific SchedulerServer to the specified FlagSet
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func (s *SchedulerServer) AddFlags(fs *pflag.FlagSet) {
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fs.IntVar(&s.Port, "port", s.Port, "The port that the scheduler's http service runs on")
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fs.Var(&s.Address, "address", "The IP address to serve on (set to 0.0.0.0 for all interfaces)")
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client.BindClientConfigFlags(fs, &s.ClientConfig)
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fs.StringVar(&s.AlgorithmProvider, "algorithm_provider", s.AlgorithmProvider, "The scheduling algorithm provider to use")
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fs.StringVar(&s.PolicyConfigFile, "policy_config_file", s.PolicyConfigFile, "File with scheduler policy configuration")
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fs.BoolVar(&s.EnableProfiling, "profiling", false, "Enable profiling via web interface host:port/debug/pprof/")
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}
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// Run runs the specified SchedulerServer. This should never exit.
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func (s *SchedulerServer) Run(_ []string) error {
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kubeClient, err := client.New(&s.ClientConfig)
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if err != nil {
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glog.Fatalf("Invalid API configuration: %v", err)
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}
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record.StartRecording(kubeClient.Events(""))
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go func() {
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if s.EnableProfiling {
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mux := http.NewServeMux()
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mux.HandleFunc("/debug/pprof/", pprof.Index)
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mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
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mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
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}
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http.ListenAndServe(net.JoinHostPort(s.Address.String(), strconv.Itoa(s.Port)), nil)
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}()
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configFactory := factory.NewConfigFactory(kubeClient)
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config, err := s.createConfig(configFactory)
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if err != nil {
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glog.Fatalf("Failed to create scheduler configuration: %v", err)
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}
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sched := scheduler.New(config)
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sched.Run()
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select {}
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}
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func (s *SchedulerServer) createConfig(configFactory *factory.ConfigFactory) (*scheduler.Config, error) {
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var policy schedulerapi.Policy
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var configData []byte
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if _, err := os.Stat(s.PolicyConfigFile); err == nil {
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configData, err = ioutil.ReadFile(s.PolicyConfigFile)
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if err != nil {
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return nil, fmt.Errorf("Unable to read policy config: %v", err)
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}
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err = latestschedulerapi.Codec.DecodeInto(configData, &policy)
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if err != nil {
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return nil, fmt.Errorf("Invalid configuration: %v", err)
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}
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return configFactory.CreateFromConfig(policy)
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}
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// if the config file isn't provided, use the specified (or default) provider
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// check of algorithm provider is registered and fail fast
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_, err := factory.GetAlgorithmProvider(s.AlgorithmProvider)
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if err != nil {
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return nil, err
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}
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return configFactory.CreateFromProvider(s.AlgorithmProvider)
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}
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