Apache Parameter Adjust

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Background

A wordpress machine runs on DigitalOcean often sudden the mysqld database lost error.

Analyze

This is because the memory is exhausted in DO, so first I enable the swap for machine. This method solved the problem for a long time.
But later it seems the robots who sent the rubbish comments continue to attack the system, causing the mysqld halt again, this time, I modified the apahce2’s works:

$ grep -Ri MaxRequestWorkers /etc/apache2/
/etc/apache2/mods-enabled/mpm_prefork.conf:# MaxRequestWorkers: maximum number of server processes allowed to start
/etc/apache2/mods-enabled/mpm_prefork.conf:     MaxRequestWorkers         150
/etc/apache2/mods-available/mpm_prefork.conf:# MaxRequestWorkers: maximum number of server processes allowed to start
/etc/apache2/mods-available/mpm_prefork.conf:   MaxRequestWorkers         150
$ vim /etc/apache2/mods-available/mpm_prefork.conf
$ vim /etc/apache2/mods-available/mpm_worker.conf
$ vim /etc/apache2/mods-available/mpm_itk.conf
$ vim /etc/apache2/mods-available/mpm_event.conf
$ service apache2 restart

The vim command is changing the MaxRequestWorkers from 150 to 10, hope this will solve the problem.

TBD

If the mysql runs into death again, then we must limit its connection towards apache2.