Kubernetes控制器日志记录来自一个上下文

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英文:

Kubernetes Controller Logging From a Context

问题

我正在使用Operator SDK为Kubernetes编写一个Operator,并且对日志记录有一个问题(我对Go还比较新手)。

我在控制器中设置了一个日志记录器,并将UUID作为Trace ID附加到其中:

func (r *MyReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
    myLog := log.FromContext(ctx).WithValues("traceID", uuid.NewUUID())
    myCtx := log.IntoContext(ctx, myLog)

然而,我有一个同时设置的库,通过结构体传递给控制器:

type MyReconciler struct {
    MyBase
    MyClient MyGreatClient
}

并且客户端的每个方法都将ctx作为参数。

由于我想要在ctx中使用日志记录器,因为它包含我的Trace ID,我需要在客户端的每个方法中添加这行代码吗?还是有更好的方法可以做到这一点?

func (mgc *MyGreatClient) SomethingExists(ctx context.Context, something string) bool {
    myGreatClientLog := log.FromContext(ctx).WithName("MyGreatClient")
    myGreatClientLog.Info("Checking Something Exists", "Something", something)

有没有更好的方法来实现我想要做的事情?似乎sigs.k8s.io/controller-runtime/pkg/log(类型为logr.Logger)不支持像zap那样仅记录上下文。

myappcontex.Logger(ctx).Info("did something awesome")

对于以惯用方式完成这个任务的任何帮助都将不胜感激。

英文:

I am writing an Operator for Kubernetes using the Operator SDK and have a question about logging (I am still rather new to Go).

I have setup a logger in my controller that I have attached a UUID to as a Trace ID

func (r *MyReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	myLog = log.FromContext(ctx).WithValues("traceID", uuid.NewUUID())
    myCtx := log.IntoContext(ctx, myLog)

However I have a Library that is setup at the same time as the controllers and passed in via the struct.

type MyReconciler struct {
	MyBase
	MyClient MyGreatClient
}

And each method on the client take the ctx as a parameter.

As I want to use the logger in the ctx as it contains my trace ID do I need to add this line to every method in the client or is there a better way to do it?

func (mgc *MyGreatClient) SomethingExists(ctx context.Context, something string) bool {
	myGreatClientLog = log.FromContext(ctx).WithName("MyGreatClient")
    myGreatClientLog.Info("Checking Something Exists", "Something", something)

Is there a better way to achieve what I am wanting to do? It doesn't appear that "sigs.k8s.io/controller-runtime/pkg/log" (of type logr.Logger) supports just logging a context like zap.

 myappcontex.Logger(ctx).Info("did something awesome")

Any help on doing this the idiomatic way is appreciated

答案1

得分: 2

我不确定这个答案,我也想知道为什么日志和日志接收器被构建得如此复杂(参考https://dave.cheney.net/2015/11/05/lets-talk-about-logging,我在logr https://pkg.go.dev/github.com/go-logr/logr@v0.3.0 中找到了这个链接!)。

这是我在生成的kubebuilder操作符控制器中记录日志的方式:

log.Log.Info("Pod Image is set", "PodImageName", testOperator.Spec.PodImage)

输出结果为:

1.6611775636957748e+09  INFO    Pod Image is set        {"PodImageName": "alexcpn/run_server:1.2"}

还有这个:

log.FromContext(ctx).Info("Pod Image is ", "PodImageName", testOperator.Spec.PodImage)

输出结果为:

1.6611801111484244e+09  INFO    Pod Image is    {"controller": "testoperartor", "controllerGroup": "grpcapp.mytest.io", "controllerKind": "Testoperartor", "testoperartor": {"name":"testoperartor-sample","namespace":"default"}, "namespace": "default", "name": "testoperartor-sample", "reconcileID": "ffa3a957-c14f-4ec9-8cf9-767c38fc26ee", "PodImageName": "alexcpn/run_server:1.2"}

该控制器使用了Golang Logr。

controller-runtime中的所有日志记录都是结构化的,使用了一个名为logr的包定义的一组接口(https://pkg.go.dev/github.com/go-logr/logr)。子包zap提供了基于Zap(go.uber.org/zap)的logr的设置帮助程序。

我可以看到它在主函数中设置了Zap日志记录:

ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
英文:

Not at all sure of this answer and I too wonder why logging and logging sinks are built so complex (refer https://dave.cheney.net/2015/11/05/lets-talk-about-logging which I found reffered in logr https://pkg.go.dev/github.com/go-logr/logr@v0.3.0 !);

This is how I logged in a generated kubebuilder operator controller

log.Log.Info("Pod Image is set", "PodImageName", testOperator.Spec.PodImage)

Ouput-

1.6611775636957748e+09  INFO    Pod Image is set        {"PodImageName": "alexcpn/run_server:1.2"}

and with this

log.FromContext(ctx).Info("Pod Image is ", "PodImageName", testOperator.Spec.PodImage)

Ouput is

1.6611801111484244e+09  INFO    Pod Image is    {"controller": "testoperartor", "controllerGroup": "grpcapp.mytest.io", "controllerKind": "Testoperartor", "testoperartor": {"name":"testoperartor-sample","namespace":"default"}, "namespace": "default", "name": "testoperartor-sample", "reconcileID": "ffa3a957-c14f-4ec9-8cf9-767c38fc26ee", "PodImageName": "alexcpn/run_server:1.2"}

The controller uses Golang Logr

All logging in controller-runtime is structured, using a set of interfaces defined by a package called logr (https://pkg.go.dev/github.com/go-logr/logr). The sub-package zap provides helpers for setting up logr backed by Zap (go.uber.org/zap)
https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/log#DelegatingLogSink

And I can see that it sets Zap logging in main

ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

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  • 本文由 发表于 2021年12月17日 18:41:57
  • 转载请务必保留本文链接:https://go.coder-hub.com/70391914.html
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