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https://github.com/brynbellomy/klog


https://github.com/brynbellomy/klog

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README 

        
klog

====



klog is a permanent fork of https://github.com/golang/glog.



## Why was klog created?



The decision to create klog was one that wasn't made lightly, but it was necessary due to some

drawbacks that are present in [glog](https://github.com/golang/glog). Ultimately, the fork was created due to glog not being under active development; this can be seen in the glog README:



> The code in this repo [...] is not itself under development



This makes us unable to solve many use cases without a fork. The factors that contributed to needing feature development are listed below:



 * `glog` [presents a lot "gotchas"](https://github.com/kubernetes/kubernetes/issues/61006) and introduces challenges in containerized environments, all of which aren't well documented.

 * `glog` doesn't provide an easy way to test logs, which detracts from the stability of software using it

 * A long term goal is to implement a logging interface that allows us to add context, change output format, etc.

 

Historical context is available here:



 * https://github.com/kubernetes/kubernetes/issues/61006

 * https://github.com/kubernetes/kubernetes/issues/70264

 * https://groups.google.com/forum/#!msg/kubernetes-sig-architecture/wCWiWf3Juzs/hXRVBH90CgAJ

 * https://groups.google.com/forum/#!msg/kubernetes-dev/7vnijOMhLS0/1oRiNtigBgAJ



----



How to use klog

===============

- Replace imports for `github.com/golang/glog` with `k8s.io/klog`

- Use `klog.InitFlags(nil)` explicitly for initializing global flags as we no longer use `init()` method to register the flags

- You can now use `log-file` instead of `log-dir` for logging to a single file (See `examples/log_file/usage_log_file.go`)

- If you want to redirect everything logged using klog somewhere else (say syslog!), you can use `klog.SetOutput()` method and supply a `io.Writer`. (See `examples/set_output/usage_set_output.go`)

- For more logging conventions (See [Logging Conventions](https://github.com/kubernetes/community/blob/master/contributors/devel/logging.md))



### Coexisting with glog

This package can be used side by side with glog. [This example](examples/coexist_glog/coexist_glog.go) shows how to initialize and syncronize flags from the global `flag.CommandLine` FlagSet. In addition, the example makes use of stderr as combined output by setting `alsologtostderr` (or `logtostderr`) to `true`.



## Community, discussion, contribution, and support



Learn how to engage with the Kubernetes community on the [community page](http://kubernetes.io/community/).



You can reach the maintainers of this project at:



- [Slack](https://kubernetes.slack.com/messages/sig-architecture)

- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-sig-architecture)



### Code of conduct



Participation in the Kubernetes community is governed by the [Kubernetes Code of Conduct](code-of-conduct.md).



----



glog

====



Leveled execution logs for Go.



This is an efficient pure Go implementation of leveled logs in the

manner of the open source C++ package

	https://github.com/google/glog



By binding methods to booleans it is possible to use the log package

without paying the expense of evaluating the arguments to the log.

Through the -vmodule flag, the package also provides fine-grained

control over logging at the file level.



The comment from glog.go introduces the ideas:



	Package glog implements logging analogous to the Google-internal

	C++ INFO/ERROR/V setup.  It provides functions Info, Warning,

	Error, Fatal, plus formatting variants such as Infof. It

	also provides V-style logging controlled by the -v and

	-vmodule=file=2 flags.



	Basic examples:



		glog.Info("Prepare to repel boarders")



		glog.Fatalf("Initialization failed: %s", err)



	See the documentation for the V function for an explanation

	of these examples:



		if glog.V(2) {

			glog.Info("Starting transaction...")

		}



		glog.V(2).Infoln("Processed", nItems, "elements")



The repository contains an open source version of the log package

used inside Google. The master copy of the source lives inside

Google, not here. The code in this repo is for export only and is not itself

under development. Feature requests will be ignored.



Send bug reports to [email protected].