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<!DOCTYPE HTML>
<html lang="zh-hans" >
<head>
<meta charset="UTF-8">
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<title>kubelet 启动流程分析 · 田飞雨</title>
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<li>
<a href="https://blog.tianfeiyu.com" target="_blank" class="custom-link">Home</a>
</li>
<li class="divider"></li>
<li class="chapter " data-level="1.1" data-path="../">
<a href="../">
<b>1.1.</b>
Introduction
</a>
</li>
<li class="chapter " data-level="1.2" data-path="./">
<a href="./">
<b>1.2.</b>
kubernetes
</a>
<ul class="articles">
<li class="chapter " data-level="1.2.1" data-path="kube_apiserver.html">
<a href="kube_apiserver.html">
<b>1.2.1.</b>
kube-apiserver 的设计与实现
</a>
</li>
<li class="chapter " data-level="1.2.2" data-path="apiserver_bootstrap_controller.html">
<a href="apiserver_bootstrap_controller.html">
<b>1.2.2.</b>
kube-apiserver 中 apiserver service 的实现
</a>
</li>
<li class="chapter " data-level="1.2.3" data-path="nodelifecycle_controller.html">
<a href="nodelifecycle_controller.html">
<b>1.2.3.</b>
node controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.4" data-path="job_controller.html">
<a href="job_controller.html">
<b>1.2.4.</b>
job controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.5" data-path="garbagecollector_controller.html">
<a href="garbagecollector_controller.html">
<b>1.2.5.</b>
garbage collector controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.6" data-path="daemonset_controller.html">
<a href="daemonset_controller.html">
<b>1.2.6.</b>
daemonset controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.7" data-path="statefulset_controller.html">
<a href="statefulset_controller.html">
<b>1.2.7.</b>
statefulset controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.8" data-path="deployment_controller.html">
<a href="deployment_controller.html">
<b>1.2.8.</b>
deployment controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.9" data-path="replicaset_controller.html">
<a href="replicaset_controller.html">
<b>1.2.9.</b>
replicaset controller 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.10" data-path="kube_scheduler_process.html">
<a href="kube_scheduler_process.html">
<b>1.2.10.</b>
kube-scheduler 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.11" data-path="kube_scheduler_algorithm.html">
<a href="kube_scheduler_algorithm.html">
<b>1.2.11.</b>
kube-scheduler predicates 与 priorities 调度算法源码分析
</a>
</li>
<li class="chapter " data-level="1.2.12" data-path="kube_scheduler_preempt.html">
<a href="kube_scheduler_preempt.html">
<b>1.2.12.</b>
kube-scheduler 优先级与抢占机制源码分析
</a>
</li>
<li class="chapter " data-level="1.2.13" data-path="k8s_service_theory.html">
<a href="k8s_service_theory.html">
<b>1.2.13.</b>
kubernetes service 原理解析
</a>
</li>
<li class="chapter " data-level="1.2.14" data-path="kube_proxy_process.html">
<a href="kube_proxy_process.html">
<b>1.2.14.</b>
kube-proxy 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.15" data-path="kube_proxy_iptables.html">
<a href="kube_proxy_iptables.html">
<b>1.2.15.</b>
kube-proxy iptables 模式源码分析
</a>
</li>
<li class="chapter " data-level="1.2.16" data-path="kube_proxy_ipvs.html">
<a href="kube_proxy_ipvs.html">
<b>1.2.16.</b>
kube-proxy ipvs 模式源码分析
</a>
</li>
<li class="chapter " data-level="1.2.17" data-path="kubelet-modules.html">
<a href="kubelet-modules.html">
<b>1.2.17.</b>
kubelet 架构浅析
</a>
</li>
<li class="chapter active" data-level="1.2.18" data-path="kubelet_init.html">
<a href="kubelet_init.html">
<b>1.2.18.</b>
kubelet 启动流程分析
</a>
</li>
<li class="chapter " data-level="1.2.19" data-path="kubelet_create_pod.html">
<a href="kubelet_create_pod.html">
<b>1.2.19.</b>
kubelet 创建 pod 的流程
</a>
</li>
<li class="chapter " data-level="1.2.20" data-path="node_status.html">
<a href="node_status.html">
<b>1.2.20.</b>
kubelet 状态上报的方式
</a>
</li>
<li class="chapter " data-level="1.2.21" data-path="k8s_events.html">
<a href="k8s_events.html">
<b>1.2.21.</b>
kubelet 中事件处理机制
</a>
</li>
<li class="chapter " data-level="1.2.22" data-path="kubelet_status_manager.html">
<a href="kubelet_status_manager.html">
<b>1.2.22.</b>
kubelet statusManager 源码分析
</a>
</li>
<li class="chapter " data-level="1.2.23" data-path="kubelet_qos.html">
<a href="kubelet_qos.html">
<b>1.2.23.</b>
kubernetes 中 Qos 的设计与实现
</a>
</li>
<li class="chapter " data-level="1.2.24" data-path="kubelet_garbage_collect.html">
<a href="kubelet_garbage_collect.html">
<b>1.2.24.</b>
kubelet 中垃圾回收机制的设计与实现
</a>
</li>
<li class="chapter " data-level="1.2.25" data-path="k8s_evicted.html">
<a href="k8s_evicted.html">
<b>1.2.25.</b>
kubernetes 中 Evicted pod 是如何产生的
</a>
</li>
<li class="chapter " data-level="1.2.26" data-path="kubernetes_descheduler.html">
<a href="kubernetes_descheduler.html">
<b>1.2.26.</b>
Kubernetes 中 Descheduler 组件的使用与扩展
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.3" data-path="../knative/">
<a href="../knative/">
<b>1.3.</b>
knative
</a>
<ul class="articles">
<li class="chapter " data-level="1.3.1" data-path="../knative/deploy_with_minkube.html">
<a href="../knative/deploy_with_minkube.html">
<b>1.3.1.</b>
在 minkube 上部署 knative
</a>
</li>
<li class="chapter " data-level="1.3.2" data-path="../knative/knative_serving.html">
<a href="../knative/knative_serving.html">
<b>1.3.2.</b>
knative serving 组件分析
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.4" data-path="../cgroup/">
<a href="../cgroup/">
<b>1.4.</b>
cgroup
</a>
<ul class="articles">
<li class="chapter " data-level="1.4.1" data-path="../cgroup/blkio_cgroup.html">
<a href="../cgroup/blkio_cgroup.html">
<b>1.4.1.</b>
blkio cgroup
</a>
</li>
<li class="chapter " data-level="1.4.2" data-path="../cgroup/pid_cgroup.html">
<a href="../cgroup/pid_cgroup.html">
<b>1.4.2.</b>
pid cgroup
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.5" data-path="../go/">
<a href="../go/">
<b>1.5.</b>
go
</a>
<ul class="articles">
<li class="chapter " data-level="1.5.1" data-path="../go/func_return_value_or_pointer.html">
<a href="../go/func_return_value_or_pointer.html">
<b>1.5.1.</b>
golang 中函数使用值返回与指针返回的区别，底层原理分析
</a>
</li>
<li class="chapter " data-level="1.5.2" data-path="../go/golang_bootstrap.html">
<a href="../go/golang_bootstrap.html">
<b>1.5.2.</b>
Golang 程序启动流程分析
</a>
</li>
<li class="chapter " data-level="1.5.3" data-path="../go/golang_gpm.html">
<a href="../go/golang_gpm.html">
<b>1.5.3.</b>
Golang GPM 模型剖析
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<a href=".." >kubelet 启动流程分析</a>
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<ul>
<li><a href="#kubelet-启动流程">Kubelet 启动流程</a><ul>
<li><a href="#newkubeletcommand">NewKubeletCommand</a></li>
<li><a href="#run">Run</a></li>
<li><a href="#run-1">run</a></li>
<li><a href="#runkubelet">RunKubelet</a></li>
<li><a href="#createandinitkubelet">createAndInitKubelet</a><ul>
<li><a href="#kubeletnewmainkubelet">kubelet.NewMainKubelet</a></li>
</ul>
</li>
<li><a href="#startkubelet">startKubelet</a></li>
</ul>
</li>
<li><a href="#run-2">Run</a><ul>
<li><a href="#initializemodules">initializeModules</a></li>
<li><a href="#faststatusupdateonce">fastStatusUpdateOnce</a><ul>
<li><a href="#updateruntimeup">updateRuntimeUp</a><ul>
<li><a href="#initializeruntimedependentmodules">initializeRuntimeDependentModules</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#小结">小结</a></li>
<li><a href="#syncloop">syncLoop</a><ul>
<li><a href="#syncloopiteration">syncLoopIteration</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#总结">总结</a></li>
</ul>
<p>本来这篇文章会继续讲述 kubelet 中的主要模块，但由于网友反馈能不能先从 kubelet 的启动流程开始，kubelet 的启动流程在很久之前基于 v1.12 写过一篇文章，对比了 v1.16 中的启动流程变化不大，但之前的文章写的比较简洁，本文会重新分析 kubelet 的启动流程。</p>
<h3 id="kubelet-启动流程"><a name="kubelet-启动流程" class="anchor-navigation-ex-anchor" href="#kubelet-启动流程"><i class="fa fa-link" aria-hidden="true"></i></a>Kubelet 启动流程</h3>
<blockquote>
<p>kubernetes 版本：v1.16</p>
</blockquote>
<p>kubelet 的启动比较复杂，首先还是把 kubelet 的启动流程图放在此处，便于在后文中清楚各种调用的流程：</p>
<p><img src="http://cdn.tianfeiyu.com/kubelet-3.png" alt=""></p>
<h4 id="newkubeletcommand"><a name="newkubeletcommand" class="anchor-navigation-ex-anchor" href="#newkubeletcommand"><i class="fa fa-link" aria-hidden="true"></i></a>NewKubeletCommand</h4>
<p>首先从 kubelet 的 <code>main</code> 函数开始，其中调用的 <code>NewKubeletCommand</code> 方法主要负责获取配置文件中的参数，校验参数以及为参数设置默认值。主要逻辑为：</p>
<ul>
<li>1、解析命令行参数；</li>
<li>2、为 kubelet 初始化 feature gates 参数；</li>
<li>3、加载 kubelet 配置文件；</li>
<li>4、校验配置文件中的参数；</li>
<li>5、检查 kubelet 是否启用动态配置功能；</li>
<li>6、初始化 kubeletDeps，kubeletDeps 包含 kubelet 运行所必须的配置，是为了实现 dependency injection，其目的是为了把 kubelet 依赖的组件对象作为参数传进来，这样可以控制 kubelet 的行为；</li>
<li>7、调用 <code>Run</code> 方法；</li>
</ul>
<p><code>k8s.io/kubernetes/cmd/kubelet/app/server.go:111</code></p>
<pre class="language-"><code>func NewKubeletCommand() *cobra.Command {
cleanFlagSet := pflag.NewFlagSet(componentKubelet, pflag.ContinueOnError)
cleanFlagSet.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
// 1、kubelet配置分两部分:
// KubeletFlag: 指那些不允许在 kubelet 运行时进行修改的配置集，或者不能在集群中各个 Nodes 之间共享的配置集。
// KubeletConfiguration: 指可以在集群中各个Nodes之间共享的配置集，可以进行动态配置。
kubeletFlags := options.NewKubeletFlags()
kubeletConfig, err := options.NewKubeletConfiguration()
if err != nil {
klog.Fatal(err)
}
cmd := &cobra.Command{
Use: componentKubelet,
DisableFlagParsing: true,
......
Run: func(cmd *cobra.Command, args []string) {
// 2、解析命令行参数
if err := cleanFlagSet.Parse(args); err != nil {
cmd.Usage()
klog.Fatal(err)
}
......
verflag.PrintAndExitIfRequested()
utilflag.PrintFlags(cleanFlagSet)
// 3、初始化 feature gates 配置
if err := utilfeature.DefaultMutableFeatureGate.SetFromMap(kubeletConfig.FeatureGates); err != nil {
klog.Fatal(err)
}
if err := options.ValidateKubeletFlags(kubeletFlags); err != nil {
klog.Fatal(err)
}
if kubeletFlags.ContainerRuntime == "remote" && cleanFlagSet.Changed("pod-infra-container-image") {
klog.Warning("Warning: For remote container runtime, --pod-infra-container-image is ignored in kubelet, which should be set in that remote runtime instead")
}
// 4、加载 kubelet 配置文件
if configFile := kubeletFlags.KubeletConfigFile; len(configFile) > 0 {
kubeletConfig, err = loadConfigFile(configFile)
......
}
// 5、校验配置文件中的参数
if err := kubeletconfigvalidation.ValidateKubeletConfiguration(kubeletConfig); err != nil {
klog.Fatal(err)
}
// 6、检查 kubelet 是否启用动态配置功能
var kubeletConfigController *dynamickubeletconfig.Controller
if dynamicConfigDir := kubeletFlags.DynamicConfigDir.Value(); len(dynamicConfigDir) > 0 {
var dynamicKubeletConfig *kubeletconfiginternal.KubeletConfiguration
dynamicKubeletConfig, kubeletConfigController, err = BootstrapKubeletConfigController(dynamicConfigDir,
func(kc *kubeletconfiginternal.KubeletConfiguration) error {
return kubeletConfigFlagPrecedence(kc, args)
})
if err != nil {
klog.Fatal(err)
}
if dynamicKubeletConfig != nil {
kubeletConfig = dynamicKubeletConfig
if err := utilfeature.DefaultMutableFeatureGate.SetFromMap(kubeletConfig.FeatureGates); err != nil {
klog.Fatal(err)
}
}
}
kubeletServer := &options.KubeletServer{
KubeletFlags: *kubeletFlags,
KubeletConfiguration: *kubeletConfig,
}
// 7、初始化 kubeletDeps
kubeletDeps, err := UnsecuredDependencies(kubeletServer)
if err != nil {
klog.Fatal(err)
}
kubeletDeps.KubeletConfigController = kubeletConfigController
stopCh := genericapiserver.SetupSignalHandler()
if kubeletServer.KubeletFlags.ExperimentalDockershim {
if err := RunDockershim(&kubeletServer.KubeletFlags, kubeletConfig, stopCh); err != nil {
klog.Fatal(err)
}
return
}
// 8、调用 Run 方法
if err := Run(kubeletServer, kubeletDeps, stopCh); err != nil {
klog.Fatal(err)
}
},
}
kubeletFlags.AddFlags(cleanFlagSet)
options.AddKubeletConfigFlags(cleanFlagSet, kubeletConfig)
options.AddGlobalFlags(cleanFlagSet)
......
return cmd
}
</code></pre><h4 id="run"><a name="run" class="anchor-navigation-ex-anchor" href="#run"><i class="fa fa-link" aria-hidden="true"></i></a>Run</h4>
<p>该方法中仅仅调用 <code>run</code> 方法执行后面的启动逻辑。</p>
<p><code>k8s.io/kubernetes/cmd/kubelet/app/server.go:408</code></p>