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https://github.com/optim-enterprises-bv/kubernetes.git
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c18626de4a
As we work towards providing a stable (v1) kubeletconfig API, we cannot afford to have deprecated or "experimental" (alpha) fields living in the KubeletConfiguration struct. This removes all existing experimental or deprecated fields, and places them in KubeletFlags instead. I'm going to send another PR after this one that organizes the remaining fields into substructures for readability. Then, we should try to move to v1 ASAP. It makes far more sense to focus on a clean API in kubeletconfig v2, than to try and further clean up the existing "API" that everyone already depends on.
118 lines
3.9 KiB
Go
118 lines
3.9 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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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// The kubelet binary is responsible for maintaining a set of containers on a particular host VM.
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// It syncs data from both configuration file(s) as well as from a quorum of etcd servers.
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// It then queries Docker to see what is currently running. It synchronizes the configuration data,
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// with the running set of containers by starting or stopping Docker containers.
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package main
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import (
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"fmt"
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"os"
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"github.com/spf13/pflag"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/apiserver/pkg/util/flag"
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"k8s.io/apiserver/pkg/util/logs"
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"k8s.io/kubernetes/cmd/kubelet/app"
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"k8s.io/kubernetes/cmd/kubelet/app/options"
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_ "k8s.io/kubernetes/pkg/client/metrics/prometheus" // for client metric registration
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"k8s.io/kubernetes/pkg/features"
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kubeletconfiginternal "k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
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"k8s.io/kubernetes/pkg/kubelet/kubeletconfig"
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_ "k8s.io/kubernetes/pkg/version/prometheus" // for version metric registration
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"k8s.io/kubernetes/pkg/version/verflag"
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)
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func die(err error) {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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os.Exit(1)
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}
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func main() {
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// construct KubeletFlags object and register command line flags mapping
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kubeletFlags := options.NewKubeletFlags()
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kubeletFlags.AddFlags(pflag.CommandLine)
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// construct KubeletConfiguration object and register command line flags mapping
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defaultConfig, err := options.NewKubeletConfiguration()
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if err != nil {
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die(err)
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}
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options.AddKubeletConfigFlags(pflag.CommandLine, defaultConfig)
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// parse the command line flags into the respective objects
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flag.InitFlags()
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// initialize logging and defer flush
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logs.InitLogs()
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defer logs.FlushLogs()
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// short-circuit on verflag
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verflag.PrintAndExitIfRequested()
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// TODO(mtaufen): won't need this this once dynamic config is GA
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// set feature gates so we can check if dynamic config is enabled
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if err := utilfeature.DefaultFeatureGate.Set(defaultConfig.FeatureGates); err != nil {
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die(err)
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}
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// validate the initial KubeletFlags, to make sure the dynamic-config-related flags aren't used unless the feature gate is on
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if err := options.ValidateKubeletFlags(kubeletFlags); err != nil {
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die(err)
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}
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// if dynamic kubelet config is enabled, bootstrap the kubelet config controller
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var kubeletConfig *kubeletconfiginternal.KubeletConfiguration
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var kubeletConfigController *kubeletconfig.Controller
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if utilfeature.DefaultFeatureGate.Enabled(features.DynamicKubeletConfig) {
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var err error
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kubeletConfig, kubeletConfigController, err = app.BootstrapKubeletConfigController(kubeletFlags, defaultConfig)
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if err != nil {
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die(err)
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}
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} else if kubeletConfig == nil {
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kubeletConfig = defaultConfig
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}
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// construct a KubeletServer from kubeletFlags and kubeletConfig
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kubeletServer := &options.KubeletServer{
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KubeletFlags: *kubeletFlags,
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KubeletConfiguration: *kubeletConfig,
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}
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// use kubeletServer to construct the default KubeletDeps
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kubeletDeps, err := app.UnsecuredDependencies(kubeletServer)
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if err != nil {
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die(err)
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}
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// add the kubelet config controller to kubeletDeps
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kubeletDeps.KubeletConfigController = kubeletConfigController
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// start the experimental docker shim, if enabled
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if kubeletFlags.ExperimentalDockershim {
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if err := app.RunDockershim(kubeletFlags, kubeletConfig); err != nil {
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die(err)
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}
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}
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// run the kubelet
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if err := app.Run(kubeletServer, kubeletDeps); err != nil {
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die(err)
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}
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}
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