Optimizing Apache configuration in WHM/Centos7

alexis75

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We are running CloudLinux on VPS with 2 Gb RAM, trying to figure out how to optimize Apache properly using 'Configure Apache RLimits'. Currently it disabled and it says "Current setting is 0 MB. We recommend 394 MB". Is it just to follow recommended value, restart Apache and monitor how it will behave?
I also seen in Apache log that some of the processes (mostly from Wordpress accounts) using as much as 515 Mb of Ram, but I guess suggested 394 is average..
 

cPanelMichael

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Is it just to follow recommended value, restart Apache and monitor how it will behave?
Hello,

Yes, that's generally a good approach.

Thank you.
 

alexis75

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Sep 12, 2017
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Ok, thanks for a quick reply! :) I'll try that right away.

Also, as it related to Apache configuration we have these settings in 'General config',
running VPS with 3 CPU / 2048 Mb RAM / 4 Gb swap with prefork Apache:

***************************
...
Start Servers = 5
Minimum Spare Servers = 5
Maximum Spare Servers = 10
Server Limit = 256
Max Request Workers = 150
Max Connections Per Child = 1000
Keep-Alive Timeout = 5
Max Keep-Alive Requests = 100
Timeout = 300
...
***************************

are those settings looks Ok for correct Apache behaviour?

What would be recommended settings taking into account our VPS parameters?
really appreciate any tips on this cause judging by Logs there are might be some problems with Apache, feels like those values are a bit too high for our VPS configuration.
 

cPanelMichael

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Hello,

Those values are often dependent on the traffic and usage your server is receiving. I've moved this thread to our Optimization forum where you might receive additional user-feedback.

Thank you.
 

alexis75

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Sep 12, 2017
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Ok, thank you!

correction:
we just added +1Gb RAM to our VPS,
now 'Configure Apache RLimits' says 478 Mb as recommended - > follow its advice.

*VPS configuration now: 3 CPU / 3 Gb RAM / 4 Gb swap with prefork Apache

Found this advice on web:
"if an average one Apache process consumes 50Mb RAM and Server RAM is 3Gb, and you want to leave 512Mb for the rest processes, then:
MaxClients = (3Gb – 512Mb)/50Mb = ~ 50

I assume MaxClients is MaxRequestWorkers in Apache 2.4.29?
shall we change 'default' MaxRequestWorkers=150 to 50 using formula above?
 
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