k8s安装与配置

一、k8s安装

最简单的安装方法是使用yum install kubernetes命令，但仍需修改各组件的启动参数，才能完成配置。

也可以下载二进制包，手动配置安装。

k8s master节点安装部署etcd，kube-apiserver，kube-controller-manager，kube-scheduler服务进程，我们使用kubectl作为客户端与master进行交互操作。在工作Node上仅需部署kubelet和kube-proxy服务进程。

此外，k8s还提供一个“all in one”的hyperkube程序来完成对以上服务程序的一键式启动。

hyperkube源码入口如下：

/cmd/hyperkube/main.go

// NewHyperKubeCommand is the entry point for hyperkube
func NewHyperKubeCommand(stopCh <-chan struct{}) (*cobra.Command, []func() *cobra.Command) {
	// these have to be functions since the command is polymorphic.  Cobra wants you to be  top level
	// command to get executed
	apiserver := func() *cobra.Command {
		ret := kubeapiserver.NewAPIServerCommand(stopCh)
		// add back some unfortunate aliases that should be removed
		ret.Aliases = []string{"apiserver"}
		return ret
	}
	controller := func() *cobra.Command {
		ret := kubecontrollermanager.NewControllerManagerCommand()
		// add back some unfortunate aliases that should be removed
		ret.Aliases = []string{"controller-manager"}
		return ret
	}
	proxy := func() *cobra.Command {
		ret := kubeproxy.NewProxyCommand()
		// add back some unfortunate aliases that should be removed
		ret.Aliases = []string{"proxy"}
		return ret
	}
	scheduler := func() *cobra.Command {
		ret := kubescheduler.NewSchedulerCommand()
		// add back some unfortunate aliases that should be removed
		ret.Aliases = []string{"scheduler"}
		return ret
	}
	kubectlCmd := func() *cobra.Command { return kubectl.NewDefaultKubectlCommand() }
	kubelet := func() *cobra.Command { return kubelet.NewKubeletCommand(stopCh) }
	cloudController := func() *cobra.Command { return cloudcontrollermanager.NewCloudControllerManagerCommand() }

	commandFns := []func() *cobra.Command{
		apiserver,
		controller,
		proxy,
		scheduler,
		kubectlCmd,
		kubelet,
		cloudController,
	}

可以看到启动了所有服务进程。

待续.......