Recommended MaxConnectionsPerChild value for mod_lsapi

yagami_kira

• February 20, 2022 18:04

According to an article MaxConnectionsPerChild limit is a specific method for assuring Apache is periodically recycling programs to reduce the impact of leaked memory on the system. When using external code handlers like Mod_fcgid, PHP-FPM or mod_lsapi, it becomes necessary to set MaxConnectionsPerChild to 0 (unlimited), doing so prevents periodic error pages caused by Apache terminating threads prematurely. " So the way I understand it, you set a MaxConnectionsPerChild to avoid memory leakage (is that still happening in these modern times?). But as the statement above, it will result to periodic error pages (does that really happen - I always thought it will always do a graceful restart and not terminate prematurely?) I'm using MPM_worker, http/2, and mod_lsapi modules. As a best practice in general, what would be the recommended value for MaxConnectionsPerChild for this kind of setup?

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  cPRex Jurassic Moderator

  • February 21, 2022 16:27

  Hey there! The default from Apache itself, which would exclude lsapi or other external tools, is also 0. We can see this about 1/3 of the way down this page:

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  yagami_kira

  • February 21, 2022 23:56

  Why is it that in WHM, the default that it indicates is "10,000". Shouldn't cPanel update that to "0" in later versions?

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  cPRex Jurassic Moderator

  • February 22, 2022 14:06

  Inside cPanel, we set the values to a default that works with our initial configuration of the Prefork MPM, which is what cPanel is installed with by default. If there are additional tools installed later, such as lsapi, that would be up to the server admin to adjust other values on the machine.

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  Spirogg

  • February 23, 2022 07:20

  It would be nice to get a write up of some defaults to use for event and worker if installed. Or have it preconfigured with defaults when we change mpm to event or worker

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  cPRex Jurassic Moderator

  • February 23, 2022 13:28

  I think that would be a good idea, but then we run into the "I changed my handler and now my Apache settings changed" issue.

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  Spirogg

  • February 28, 2022 22:58

  I think that would be a good idea, but then we run into the "I changed my handler and now my Apache settings changed" issue.

  
  just a reference as examples for defaults.. even if its in the ticket area of how too this would be good just for the basics defaults with a link to apache for each worker. *check apache for more detailed information or contact a server administrator.

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  cPRex Jurassic Moderator

  • March 01, 2022 13:33

  Do you mean to put that in the WHM interface?

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