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目前刚开始写一个月，一共写了18篇原创文章，文章目录如下：
istio防故障利器，你知道几个,istio新手不要读，太难！
不懂envoyfilter也敢说精通istio系列-http-rbac-不要只会用AuthorizationPolicy配置权限
不懂envoyfilter也敢说精通istio系列-02-http-corsFilter-不要只会vs
不懂envoyfilter也敢说精通istio系列-03-http-csrf filter-再也不用再代码里写csrf逻辑了
不懂envoyfilter也敢说精通istio系列http-jwt_authn-不要只会RequestAuthorization
不懂envoyfilter也敢说精通istio系列-05-fault-filter-故障注入不止是vs
不懂envoyfilter也敢说精通istio系列-06-http-match-配置路由不只是vs
不懂envoyfilter也敢说精通istio系列-07-负载均衡配置不止是dr
不懂envoyfilter也敢说精通istio系列-08-连接池和断路器
不懂envoyfilter也敢说精通istio系列-09-http-route filter
不懂envoyfilter也敢说精通istio系列-network filter-redis proxy
不懂envoyfilter也敢说精通istio系列-network filter-HttpConnectionManager
不懂envoyfilter也敢说精通istio系列-ratelimit-istio ratelimit完全手册
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type DescribeOptions struct {// describe结构体
CmdParent string
Selector string
Namespace string
Describer func(*meta.RESTMapping) (describe.Describer, error)
NewBuilder func() *resource.Builder
BuilderArgs []string
EnforceNamespace bool
AllNamespaces bool
DescriberSettings *describe.DescriberSettings
FilenameOptions *resource.FilenameOptions
genericclioptions.IOStreams
}//创建describe命令
func NewCmdDescribe(parent string, f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := &DescribeOptions{//初始化结构体
FilenameOptions: &resource.FilenameOptions{},
DescriberSettings: &describe.DescriberSettings{
ShowEvents: true,
},
CmdParent: parent,
IOStreams: streams,
}
cmd := &cobra.Command{//创建cobra命令
Use: "describe (-f FILENAME | TYPE [NAME_PREFIX | -l label] | TYPE/NAME)",
DisableFlagsInUseLine: true,
Short: i18n.T("Show details of a specific resource or group of resources"),
Long: describeLong + "\n\n" + cmdutil.SuggestAPIResources(parent),
Example: describeExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))//准备
cmdutil.CheckErr(o.Run())//运行
},
}
usage := "containing the resource to describe"
cmdutil.AddFilenameOptionFlags(cmd, o.FilenameOptions, usage)//文件选项
cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")//selector选项
cmd.Flags().BoolVarP(&o.AllNamespaces, "all-namespaces", "A", o.AllNamespaces, "If present, list the requested object(s) across all namespaces. Namespace in current context is ignored even if specified with --namespace.")//all-namespaces选项
cmd.Flags().BoolVar(&o.DescriberSettings.ShowEvents, "show-events", o.DescriberSettings.ShowEvents, "If true, display events related to the described object.")//show-event选项
cmdutil.AddIncludeUninitializedFlag(cmd)
return cmd
}//准备方法
func (o *DescribeOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
var err error
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()//设置namespace和enforceNamespace
if err != nil {
return err
}
if o.AllNamespaces {//如果指定all-namespaces则enforceNamespace为false
o.EnforceNamespace = false
}
if len(args) == 0 && cmdutil.IsFilenameSliceEmpty(o.FilenameOptions.Filenames, o.FilenameOptions.Kustomize) {//资源和文件必须有一个
return fmt.Errorf("You must specify the type of resource to describe. %s\n", cmdutil.SuggestAPIResources(o.CmdParent))
}
o.BuilderArgs = args//资源
o.Describer = func(mapping *meta.RESTMapping) (describe.Describer, error) {//获取describer
return describeversioned.DescriberFn(f, mapping)
}
o.NewBuilder = f.NewBuilder//设置builder
return nil
}//运行
func (o *DescribeOptions) Run() error {
r := o.NewBuilder().
Unstructured().
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().AllNamespaces(o.AllNamespaces).
FilenameParam(o.EnforceNamespace, o.FilenameOptions).
LabelSelectorParam(o.Selector).
ResourceTypeOrNameArgs(true, o.BuilderArgs...).
Flatten().
Do()//构造result对象
err := r.Err()
if err != nil {
return err
}
allErrs := []error{}
infos, err := r.Infos()//获取infos
if err != nil {
if apierrors.IsNotFound(err) && len(o.BuilderArgs) == 2 {//如果没找到资源，并且参数是两个
return o.DescribeMatchingResources(err, o.BuilderArgs[0], o.BuilderArgs[1])//执行模糊describe
}
allErrs = append(allErrs, err)
}
errs := sets.NewString()
first := true
for _, info := range infos {//遍历infos
mapping := info.ResourceMapping()//获取mapping
describer, err := o.Describer(mapping)//获取describer
if err != nil {
if errs.Has(err.Error()) {
continue
}
allErrs = append(allErrs, err)
errs.Insert(err.Error())
continue
}
s, err := describer.Describe(info.Namespace, info.Name, *o.DescriberSettings)//执行describe
if err != nil {
if errs.Has(err.Error()) {
continue
}
allErrs = append(allErrs, err)
errs.Insert(err.Error())
continue
}
if first {
first = false
fmt.Fprint(o.Out, s)//打印describe结果
} else {
fmt.Fprintf(o.Out, "\n\n%s", s)//打印describe结果
}
}
return utilerrors.NewAggregate(allErrs)
}//执行模糊describe
func (o *DescribeOptions) DescribeMatchingResources(originalError error, resource, prefix string) error {
r := o.NewBuilder().
Unstructured().
NamespaceParam(o.Namespace).DefaultNamespace().
ResourceTypeOrNameArgs(true, resource).
SingleResourceType().
Flatten().
Do()//构造result对象
mapping, err := r.ResourceMapping()//湖区mapping
if err != nil {
return err
}
describer, err := o.Describer(mapping)//获取describe
if err != nil {
return err
}
infos, err := r.Infos()//获取infos
if err != nil {
return err
}
isFound := false
for ix := range infos {//遍历infos
info := infos[ix]
if strings.HasPrefix(info.Name, prefix) {//如果info名称函数prefix
isFound = true
s, err := describer.Describe(info.Namespace, info.Name, *o.DescriberSettings)//执行describe
if err != nil {
return err
}
fmt.Fprintf(o.Out, "%s\n", s)//打印结果
}
}
if !isFound {
return originalError
}
return nil
}//执行describe
func (dd *DeploymentDescriber) Describe(namespace, name string, describerSettings describe.DescriberSettings) (string, error) {
d, err := dd.client.AppsV1().Deployments(namespace).Get(name, metav1.GetOptions{})//获取deployment
if err != nil {
return "", err
}
selector, err := metav1.LabelSelectorAsSelector(d.Spec.Selector)//获取deploy的selector
if err != nil {
return "", err
}
var events *corev1.EventList
if describerSettings.ShowEvents {//判断是否show-event
events, _ = dd.client.CoreV1().Events(namespace).Search(scheme.Scheme, d)//获取deploy的events
}
return describeDeployment(d, selector, d, events, dd)//执行describe
}func describeDeployment(d *appsv1.Deployment, selector labels.Selector, internalDeployment *appsv1.Deployment, events *corev1.EventList, dd *DeploymentDescriber) (string, error) {
return tabbedString(func(out io.Writer) error {
w := NewPrefixWriter(out)
w.Write(LEVEL_0, "Name:\t%s\n", d.ObjectMeta.Name)//输出name
w.Write(LEVEL_0, "Namespace:\t%s\n", d.ObjectMeta.Namespace)//输出namespace
w.Write(LEVEL_0, "CreationTimestamp:\t%s\n", d.CreationTimestamp.Time.Format(time.RFC1123Z))//输出createtime
printLabelsMultiline(w, "Labels", d.Labels)//输出labels
printAnnotationsMultiline(w, "Annotations", d.Annotations)//输出annotations
w.Write(LEVEL_0, "Selector:\t%s\n", selector)//输出selector
w.Write(LEVEL_0, "Replicas:\t%d desired | %d updated | %d total | %d available | %d unavailable\n", *(d.Spec.Replicas), d.Status.UpdatedReplicas, d.Status.Replicas, d.Status.AvailableReplicas, d.Status.UnavailableReplicas)//输出replicas
w.Write(LEVEL_0, "StrategyType:\t%s\n", d.Spec.Strategy.Type)//StrategyType
w.Write(LEVEL_0, "MinReadySeconds:\t%d\n", d.Spec.MinReadySeconds)//MinReadySeconds
if d.Spec.Strategy.RollingUpdate != nil {
ru := d.Spec.Strategy.RollingUpdate
w.Write(LEVEL_0, "RollingUpdateStrategy:\t%s max unavailable, %s max surge\n", ru.MaxUnavailable.String(), ru.MaxSurge.String())//RollingUpdateStrategy
}
DescribePodTemplate(&internalDeployment.Spec.Template, w)//describe pod template
if len(d.Status.Conditions) > 0 {
w.Write(LEVEL_0, "Conditions:\n Type\tStatus\tReason\n")
w.Write(LEVEL_1, "----\t------\t------\n")
for _, c := range d.Status.Conditions {
w.Write(LEVEL_1, "%v \t%v\t%v\n", c.Type, c.Status, c.Reason)//输出Conditions
}
}
oldRSs, _, newRS, err := deploymentutil.GetAllReplicaSets(d, dd.client.AppsV1())
if err == nil {
w.Write(LEVEL_0, "OldReplicaSets:\t%s\n", printReplicaSetsByLabels(oldRSs))
var newRSs []*appsv1.ReplicaSet
if newRS != nil {
newRSs = append(newRSs, newRS)
}
w.Write(LEVEL_0, "NewReplicaSet:\t%s\n", printReplicaSetsByLabels(newRSs))//NewReplicaSet
}
if events != nil {
DescribeEvents(events, w)//describe event
}
return nil
})
}
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