Apache2 sensible prefork tuning

[AntJanus]

Todo:

• initial rewrite
• change if/else loops
• testing

Resolving: #89

[AntJanus]

On a 2gb machine:

    <IfModule mpm_prefork_module>
        StartServers          10
        MinSpareServers       8
        MaxSpareServers       15
        MaxClients            25
        ServerLimit           25
        MaxRequestsPerChild   1000
    </IfModule>

On a 1gb machine:

    <IfModule mpm_prefork_module>
        StartServers          3
        MinSpareServers       3
        MaxSpareServers       3
        MaxClients            10
        ServerLimit           10
        MaxRequestsPerChild   1000
    </IfModule>

On anything lower:

    <IfModule mpm_prefork_module>
        StartServers          3
        MinSpareServers       3
        MaxSpareServers       3
        MaxClients            5
        ServerLimit           5
        MaxRequestsPerChild   1000
    </IfModule>

[EvanK]

👍

[ericclemmons]

@mcheck Whatcha think?

[mcheck]

Perfect. For a 1G machine, that seems very reasonable.
Especially considering my apache PHP instances were ~62M and I ended up with MaxClients around 14.

[AntJanus]

@mcheck I wanted to be a bit on the conservative side so that everyone wins.

@ericclemmons I'm thinking of making a write-up to explain how to tune apache so that any future users can access it as a guide to making their custom changes to the provisioning. What do you think?

[mcheck]

@AntJanus I think a guide would be great. As a related side note, I added swap to my vps that wasn't in the provisioning (not sure that it could have been) and changed the swappiness to 10 in order to provide protection from memory full issues that might arise from bad apache (or other) processes.