They do it to allow Kubernetes to manage the configuration externally in a generic way. Then it doesn’t matter if it is a Java app, Ruby, Python, C#, etc. They can use the same configuration on every container to do the same thing.
What I am most interested in was the discussion we had some time ago about the performance aspects of writing to stdout. I seem to recall that was the discussion where direct=“true” was being tested and some oddities in performance were found. Ralph > On Apr 2, 2018, at 10:09 AM, Chandra <[email protected]> > wrote: > > In general, I believe writing stuff to stdout is a bad idea, even if you are > just using it as a `debug` log. the itchy thing for me is that there’s > always another extra “piping” / “redirect” which has to happen for > _persisting_ the log data. If you want to do that, why not just write it to a > file directly. > > > > Best, > Chandra > > On 2 Apr 2018, 10:38 PM +0530, Matt Sicker <[email protected]>, wrote: >> I always set direct="true" on console appenders (it's false by default >> because we added that option later). >> >> On 2 April 2018 at 12:05, Gary Gregory <[email protected]> wrote: >> >>> I'm sure this is OS dependent as well. I've only seen the obvious: if you >>> log a ton of data, say at the DEBUG level, and enable DEBUG, then yeah, >>> things are going to slow down. Obvious. >>> >>> The complain I usually hear is that our server logs too much DEBUG data, >>> and that users do not know which log category to disable to alleviate this >>> issue. But that is not a Log4j issue. >>> >>> Gary >>> >>> On Mon, Apr 2, 2018 at 10:29 AM, Ralph Goers <[email protected] >>> wrote: >>> >>>> Some of my team members at work are looking to move some services into >>>> Docker containers managed by Kubernetes following the guidance at >>>> https://12factor.net/logs <https://12factor.net/logs>. >>>> >>>> We have guidance that shows writing to the console is terrible and I >>>> remember having a discussion that writing to stdout is bad even if it is >>>> redirected to a file, but I can’t seem to find a link to that. >>>> >>>> Do any of you have experience with this? My gut instinct is telling me >>>> that what they are trying to do is a horrible idea. >>>> >>>> Ralph >>> >> >> >> >> -- >> Matt Sicker <[email protected]
