Should I increase MaxSpareServer?

Asked Sep 08 '20 at 09:57

Active Apr 14 '21 at 14:15

Viewed 95 times

Recently we have surfered a 2 minutes downtime in one Apache Server 2.4. There is not any significant error in error_log like "Max server Limit reached" and neither in acces_log.

Moreover, there is not a huge amount of client request in access_log, and neither bots requests.

This is the behaviour of server-status.

We can see, how Apache Idle Workers decrease to zero before increasing. Notice that nagios monitoring check this each 5 minutes, so we have to consider that there may be some delay and the data may not be 100% reliable.

Finally, this is our server worker configuration:

  <IfModule mpm_prefork_module>
StartServers       13
MinSpareServers    10
MaxSpareServers   150
ServerLimit      1024
MaxClients       1024
MaxRequestWorkers 1024
MaxRequestsPerChild  10000
</IfModule>

Should we consider to increase the "MaxSpareServers" despite this is an unrecommnended practice in Apache documentation?

Does anyone have any clues on some other issue that I am overlooking?

Thanks a lot!

edited Apr 14 '21 at 14:15

Keith

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asked Sep 08 '20 at 09:57

Pablo Luna

1

Also consider not using pre-fork https://serverfault.com/q/383526/546643 – Bob Sep 08 '20 at 10:50
You are right, though I really don`t know if there exists any application which needs prefork mode in the plattform. – Pablo Luna Sep 08 '20 at 10:59
If there is, you should get rid of that too. – Michael Hampton Sep 08 '20 at 12:49
What does your load average, memory usage, and page file look like during that time? – Bert Sep 08 '20 at 14:00
load average, memory usage, and page file? Nothing at all. We also are monitoring this and there is not any other issue related to this. – Pablo Luna Sep 09 '20 at 06:05

Should I increase MaxSpareServer?

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