发布一个k8s部署视频：https://edu.csdn.net/course/detail/26967
课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。
腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518
第二个视频发布 https://edu.csdn.net/course/detail/27109
腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518
介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。
第三个视频发布：https://edu.csdn.net/course/detail/27574
详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件
第四个课程发布：https://edu.csdn.net/course/detail/28488
本课程将详细介绍k8s所有命令，以及命令的go源码分析，学习知其然，知其所以然 ————————————————
type GetContextsOptions struct {//get-contexts结构体 configAccess clientcmd.ConfigAccess nameOnly bool showHeaders bool contextNames []string genericclioptions.IOStreams } //创建get-contexts命令 func NewCmdConfigGetContexts(streams genericclioptions.IOStreams, configAccess clientcmd.ConfigAccess) *cobra.Command { options := &GetContextsOptions{//初始化结构体 configAccess: configAccess, IOStreams: streams, } cmd := &cobra.Command{//创建cobra命令 Use: "get-contexts [(-o|--output=)name)]", DisableFlagsInUseLine: true, Short: i18n.T("Describe one or many contexts"), Long: getContextsLong, Example: getContextsExample, Run: func(cmd *cobra.Command, args []string) { validOutputTypes := sets.NewString("", "json", "yaml", "wide", "name", "custom-columns", "custom-columns-file", "go-template", "go-template-file", "jsonpath", "jsonpath-file")//有效的输出格式 supportedOutputTypes := sets.NewString("", "name")//支持的输出格式 outputFormat := cmdutil.GetFlagString(cmd, "output")//获取输出格式 if !validOutputTypes.Has(outputFormat) {//判断输出是否有效 cmdutil.CheckErr(fmt.Errorf("output must be one of '' or 'name': %v", outputFormat)) } if !supportedOutputTypes.Has(outputFormat) {.//判断输出是否支持 fmt.Fprintf(options.Out, "--output %v is not available in kubectl config get-contexts; resetting to default output format\n", outputFormat) cmd.Flags().Set("output", "") } cmdutil.CheckErr(options.Complete(cmd, args))//准备 cmdutil.CheckErr(options.RunGetContexts())//运行 }, } cmd.Flags().Bool("no-headers", false, "When using the default or custom-column output format, don't print headers (default print headers).")//no-headers选项 cmd.Flags().StringP("output", "o", "", "Output format. One of: name")//output选项 return cmd } //准备 func (o *GetContextsOptions) Complete(cmd *cobra.Command, args []string) error { o.contextNames = args//设置contextNames o.nameOnly = false//设置nameOnly if cmdutil.GetFlagString(cmd, "output") == "name" {//如果输出格式是name，设置nameOnly为true o.nameOnly = true } o.showHeaders = true//设置showHeaders if cmdutil.GetFlagBool(cmd, "no-headers") || o.nameOnly {//如果no-headers或nameOnly为true，设置shouHeaders为false o.showHeaders = false } return nil } //运行 func (o GetContextsOptions) RunGetContexts() error { config, err := o.configAccess.GetStartingConfig()//加载config if err != nil { return err } out, found := o.Out.(*tabwriter.Writer)//把out转为tabwriter if !found {//转换失败 out = printers.GetNewTabWriter(o.Out)//包装tabwriter defer out.Flush() } // Build a list of context names to print, and warn if any requested contexts are not found. // Do this before printing the headers so it doesn't look ugly. allErrs := []error{} toPrint := []string{} if len(o.contextNames) == 0 {//如果contextName为空 for name := range config.Contexts {//append所有contexts name到toPrint toPrint = append(toPrint, name) } } else { for _, name := range o.contextNames {//遍历contextNames _, ok := config.Contexts[name]//判断context是否存在 if ok {//如果存在append到toPrint toPrint = append(toPrint, name) } else {//不存在append错误 allErrs = append(allErrs, fmt.Errorf("context %v not found", name)) } } } if o.showHeaders {//如果showHeaders为true err = printContextHeaders(out, o.nameOnly)// 打印头 if err != nil { allErrs = append(allErrs, err) } } sort.Strings(toPrint)//对context进行排序 for _, name := range toPrint {//遍历toPrint err = printContext(name, config.Contexts[name], out, o.nameOnly, config.CurrentContext == name)//打印context if err != nil { allErrs = append(allErrs, err) } } return utilerrors.NewAggregate(allErrs) } //打印头 func printContextHeaders(out io.Writer, nameOnly bool) error { columnNames := []string{"CURRENT", "NAME", "CLUSTER", "AUTHINFO", "NAMESPACE"} if nameOnly {//如果nameOnly取第一个 columnNames = columnNames[:1] } _, err := fmt.Fprintf(out, "%s\n", strings.Join(columnNames, "\t"))//打印头 return err } //打印context func printContext(name string, context *clientcmdapi.Context, w io.Writer, nameOnly, current bool) error { if nameOnly {//如果nameOnly打印name返回 _, err := fmt.Fprintf(w, "%s\n", name) return err } prefix := " " if current {// 如果是当前context，打印*号 prefix = "*" } _, err := fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", prefix, name, context.Cluster, context.AuthInfo, context.Namespace)//打印context return err }
