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standalone.go
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standalone.go
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/*
Copyright 2014 Google Inc. All rights reserved.
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 standalone
import (
"fmt"
"math"
"net"
"net/http"
"os"
"time"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
minionControllerPkg "github.com/GoogleCloudPlatform/kubernetes/pkg/cloudprovider/controller"
"github.com/GoogleCloudPlatform/kubernetes/pkg/controller"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/config"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/master"
"github.com/GoogleCloudPlatform/kubernetes/pkg/resources"
"github.com/GoogleCloudPlatform/kubernetes/pkg/service"
"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler"
"github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/factory"
"github.com/golang/glog"
)
type delegateHandler struct {
delegate http.Handler
}
func (h *delegateHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if h.delegate != nil {
h.delegate.ServeHTTP(w, req)
return
}
w.WriteHeader(http.StatusNotFound)
}
// Get a docker endpoint, either from the string passed in, or $DOCKER_HOST environment variables
func GetDockerEndpoint(dockerEndpoint string) string {
var endpoint string
if len(dockerEndpoint) > 0 {
endpoint = dockerEndpoint
} else if len(os.Getenv("DOCKER_HOST")) > 0 {
endpoint = os.Getenv("DOCKER_HOST")
} else {
endpoint = "unix:///var/run/docker.sock"
}
glog.Infof("Connecting to docker on %s", endpoint)
return endpoint
}
// RunApiServer starts an API server in a go routine.
func RunApiServer(cl *client.Client, etcdClient tools.EtcdClient, addr string, port int) {
handler := delegateHandler{}
helper, err := master.NewEtcdHelper(etcdClient, "")
if err != nil {
glog.Fatalf("Unable to get etcd helper: %v", err)
}
// Create a master and install handlers into mux.
m := master.New(&master.Config{
Client: cl,
EtcdHelper: helper,
KubeletClient: &client.HTTPKubeletClient{
Client: http.DefaultClient,
Port: 10250,
},
EnableLogsSupport: false,
APIPrefix: "/api",
Authorizer: apiserver.NewAlwaysAllowAuthorizer(),
ReadWritePort: port,
ReadOnlyPort: port,
PublicAddress: addr,
})
handler.delegate = m.InsecureHandler
go http.ListenAndServe(fmt.Sprintf("%s:%d", addr, port), &handler)
}
// RunScheduler starts up a scheduler in it's own goroutine
func RunScheduler(cl *client.Client) {
// Scheduler
schedulerConfigFactory := factory.NewConfigFactory(cl)
schedulerConfig, err := schedulerConfigFactory.Create(nil, nil)
if err != nil {
glog.Fatal("Couldn't create scheduler config: %v", err)
}
scheduler.New(schedulerConfig).Run()
}
// RunControllerManager starts a controller
func RunControllerManager(machineList []string, cl *client.Client, nodeMilliCPU, nodeMemory int64) {
if int64(int(nodeMilliCPU)) != nodeMilliCPU {
glog.Warningf("node_milli_cpu is too big for platform. Clamping: %d -> %d",
nodeMilliCPU, math.MaxInt32)
nodeMilliCPU = math.MaxInt32
}
if int64(int(nodeMemory)) != nodeMemory {
glog.Warningf("node_memory is too big for platform. Clamping: %d -> %d",
nodeMemory, math.MaxInt32)
nodeMemory = math.MaxInt32
}
nodeResources := &api.NodeResources{
Capacity: api.ResourceList{
resources.CPU: util.NewIntOrStringFromInt(int(nodeMilliCPU)),
resources.Memory: util.NewIntOrStringFromInt(int(nodeMemory)),
},
}
minionController := minionControllerPkg.NewMinionController(nil, "", machineList, nodeResources, cl)
minionController.Run(10 * time.Second)
endpoints := service.NewEndpointController(cl)
go util.Forever(func() { endpoints.SyncServiceEndpoints() }, time.Second*10)
controllerManager := controller.NewReplicationManager(cl)
controllerManager.Run(10 * time.Second)
}
// SimpleRunKubelet is a simple way to start a Kubelet talking to dockerEndpoint, using an etcdClient.
// Under the hood it calls RunKubelet (below)
func SimpleRunKubelet(etcdClient tools.EtcdClient, dockerClient dockertools.DockerInterface, hostname, rootDir, manifestURL, address string, port uint) {
kcfg := KubeletConfig{
EtcdClient: etcdClient,
DockerClient: dockerClient,
HostnameOverride: hostname,
RootDirectory: rootDir,
ManifestURL: manifestURL,
NetworkContainerImage: kubelet.NetworkContainerImage,
Port: port,
Address: util.IP(net.ParseIP(address)),
EnableServer: true,
EnableDebuggingHandlers: true,
}
RunKubelet(&kcfg)
}
// RunKubelet is responsible for setting up and running a kubelet. It is used in three different applications:
// 1 Integration tests
// 2 Kubelet binary
// 3 Standalone 'kubernetes' binary
// Eventually, #2 will be replaced with instances of #3
func RunKubelet(kcfg *KubeletConfig) {
kubelet.SetupEventSending(kcfg.AuthPath, kcfg.ApiServerList)
kubelet.SetupLogging()
kubelet.SetupCapabilities(kcfg.AllowPrivileged)
kcfg.Hostname = kubelet.GetHostname(kcfg.HostnameOverride)
if len(kcfg.RootDirectory) > 0 {
kubelet.SetupRootDirectoryOrDie(kcfg.RootDirectory)
}
cfg := makePodSourceConfig(kcfg)
k := createAndInitKubelet(kcfg)
// process pods and exit.
if kcfg.Runonce {
if _, err := k.RunOnce(cfg.Updates()); err != nil {
glog.Errorf("--runonce failed: %v", err)
}
} else {
startKubelet(k, cfg, kcfg)
}
}
func startKubelet(k *kubelet.Kubelet, cfg *config.PodConfig, kc *KubeletConfig) {
// start the kubelet
go util.Forever(func() { k.Run(cfg.Updates()) }, 0)
// start the kubelet server
if kc.EnableServer {
go util.Forever(func() {
kubelet.ListenAndServeKubeletServer(k, cfg.Channel("http"), net.IP(kc.Address), kc.Port, kc.EnableDebuggingHandlers)
}, 0)
}
}
func makePodSourceConfig(kc *KubeletConfig) *config.PodConfig {
// source of all configuration
cfg := config.NewPodConfig(config.PodConfigNotificationSnapshotAndUpdates)
// define file config source
if kc.ConfigFile != "" {
config.NewSourceFile(kc.ConfigFile, kc.FileCheckFrequency, cfg.Channel("file"))
}
// define url config source
if kc.ManifestURL != "" {
config.NewSourceURL(kc.ManifestURL, kc.HttpCheckFrequency, cfg.Channel("http"))
}
if kc.EtcdClient != nil {
glog.Infof("Watching for etcd configs at %v", kc.EtcdClient.GetCluster())
config.NewSourceEtcd(config.EtcdKeyForHost(kc.Hostname), kc.EtcdClient, cfg.Channel("etcd"))
}
return cfg
}
type KubeletConfig struct {
EtcdClient tools.EtcdClient
DockerClient dockertools.DockerInterface
CAdvisorPort uint
Address util.IP
AuthPath string
ApiServerList util.StringList
AllowPrivileged bool
HostnameOverride string
RootDirectory string
ConfigFile string
ManifestURL string
FileCheckFrequency time.Duration
HttpCheckFrequency time.Duration
Hostname string
NetworkContainerImage string
SyncFrequency time.Duration
RegistryPullQPS float64
RegistryBurst int
MinimumGCAge time.Duration
MaxContainerCount int
EnableServer bool
EnableDebuggingHandlers bool
Port uint
Runonce bool
}
func createAndInitKubelet(kc *KubeletConfig) *kubelet.Kubelet {
// TODO: block until all sources have delivered at least one update to the channel, or break the sync loop
// up into "per source" synchronizations
k := kubelet.NewMainKubelet(
kc.Hostname,
kc.DockerClient,
kc.EtcdClient,
kc.RootDirectory,
kc.NetworkContainerImage,
kc.SyncFrequency,
float32(kc.RegistryPullQPS),
kc.RegistryBurst,
kc.MinimumGCAge,
kc.MaxContainerCount)
k.BirthCry()
go kubelet.GarbageCollectLoop(k)
go kubelet.MonitorCAdvisor(k, kc.CAdvisorPort)
kubelet.InitHealthChecking(k)
return k
}