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Each Apache process is using about 70MB of private/rss memory, so I would like to lean them up a bit. The server runs Magento and Wordpress only. PHP is run as fcgid.

Which modules would you consider safe to disable?

Loaded Modules:

core_module (static)

mpm_prefork_module (static)

http_module (static)

so_module (static)

auth_basic_module (shared)

auth_digest_module (shared)

authn_file_module (shared)

authn_alias_module (shared)

authn_anon_module (shared)

authn_dbm_module (shared)

authn_default_module (shared)

authz_host_module (shared)

authz_user_module (shared)

authz_owner_module (shared)

authz_groupfile_module (shared)

authz_dbm_module (shared)

authz_default_module (shared)

ldap_module (shared)

authnz_ldap_module (shared)

include_module (shared)

log_config_module (shared)

logio_module (shared)

env_module (shared)

ext_filter_module (shared)

mime_magic_module (shared)

expires_module (shared)

deflate_module (shared)

headers_module (shared)

usertrack_module (shared)

setenvif_module (shared)

mime_module (shared)

dav_module (shared)

status_module (shared)

autoindex_module (shared)

info_module (shared)

dav_fs_module (shared)

vhost_alias_module (shared)

negotiation_module (shared)

dir_module (shared)

actions_module (shared)

speling_module (shared)

userdir_module (shared)

alias_module (shared)

substitute_module (shared)

rewrite_module (shared)

proxy_module (shared)

proxy_balancer_module (shared)

proxy_ftp_module (shared)

proxy_http_module (shared)

proxy_ajp_module (shared)

proxy_connect_module (shared)

cache_module (shared)

suexec_module (shared)

disk_cache_module (shared)

cgi_module (shared)

version_module (shared)

sed_module (shared)

security2_module (shared)

unique_id_module (shared)

fcgid_module (shared)

evasive20_module (shared)

perl_module (shared)

php5_module (shared)

ssl_module (shared)

dav_svn_module (shared)

authz_svn_module (shared)

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5  
The ones you don't use. –  Ignacio Vazquez-Abrams Jun 25 '12 at 0:29
1  
It's likely you don't actually use over half of those, but you'll probably have to disable one at a time and test to see if the site still works. –  Chris S Jun 25 '12 at 4:22
    
The better question would be "Which Apache modules are safe to enable?". As for security and performance reasons, you should always have only this enabled you really use and need. How to find out? Well, disable all and reenable them one at a time. –  Markus W Mahlberg Oct 27 at 9:27

2 Answers 2

up vote 3 down vote accepted

Here is a webpage which details which Apache modules can be safely removed. He considers the most common use cases but you should always check afterwards and reenable what you do need:

This is the list of modules that the author left enabled:

core_module (static)
log_config_module (static)
logio_module (static)
version_module (static)
mpm_event_module (static)
http_module (static)
so_module (static)
auth_basic_module (shared)
authn_file_module (shared)
authz_host_module (shared)
authz_user_module (shared)
expires_module (shared)
deflate_module (shared)
headers_module (shared)
dir_module (shared)
mime_module (shared)
setenvif_module (shared)
rewrite_module (shared)
proxy_module (shared)
proxy_fcgi_module (shared)

The page contains details for CentOS and also Ubuntu server. I highly recommend reading the entire page as it contains details as to why certain packages were left or were disabled, as well as tips. Your use case is likely not exactly as the author's use case, so be sure to use discretion and proper judgement. And test!

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I would disable these ones:

ldap_module
authnz_ldap_module
logio_module
usertrack_module
dav_module
status_module
info_module
dav_fs_module
userdir_module
proxy_module
proxy_balancer_module
proxy_ftp_module
proxy_http_module
proxy_ajp_module
proxy_connect_module
dav_svn_module
authz_svn_module

And maybe:

autoindex_module
perl_module
ssl_module

As mentioned though, check which ones you're actually using, and disable the others. If you disable them just by commenting the line in the config file, then you can easily re-enable them if something breaks without a certain module.

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1  
In addition, I would always disable every proxy module on any site by default, unless you specifically know you need it, because if you get it accidentally or maliciously configured, you're wide open to abuse. –  EightBitTony Jun 25 '12 at 9:00
    
Thanks, I removed all of the recomended ones (and perl from the 2nd list). Still need ssl_module (i run magento) and I want autoindex functionality. But private memory is still around 70Mb per process... –  Gaia Jun 26 '12 at 17:19

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