APACHE
-resources:
http://2bits.com/ (search apache)
http://www.devside.net/articles/apache-performance-tuning
MaxClients - defines how many simultaneous requests can be served. Any connection requests from browsers that come in after that will be queued. Default hard limit of 256. Is ok to set high for static content, but bad for rendered pages.
MaxSpareServers
MinSpareServers
StartServers
ServerLimit
Thrashing - where the system is just swapping pages from physical memory to virtual memory (on disk), and vice versa, without doing any real work.
Apache processes with modules (mod_perl, mod_python, mod_php) can easily be 21MB per process.
Can improve with PHP op-code cache/accelerator, then you can make each Apache process take as little as 12MB.
-this is where one_liner for RSS
-sort processes by mem usage
# ps auwxx --sort rss
# icps "semiphores"
-if apache is high mem usage, check MaxRequestsPerChild and keepalives
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REAL WORLD
# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# ServerLimit: maximum value for MaxClients for the lifetime of the server
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 128
MaxClients 128
MaxRequestsPerChild 4000
</IfModule>
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Rewrites
Rewrite to force HTTPS
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
Rewrite to force WWW.
RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=301,L]
The following will redirect '.com' site to the SSL enabled '.co.uk' site; then force a rewrite of non-SSL requests to the '.co.uk' will be forced to the 'https' version of the site:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.pruhealthrewards\.com$ [NC]
RewriteRule ^(.*)$ https://www.pruhealthrewards.co.uk/$1 [R=301,L]
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301]
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Apache Password Protect Directory
// .htaccess file
AuthType Basic
AuthUserFile /path/to/.htpasswd
AuthName "Restricted Access"
require valid-user
# htpasswd -c /path/to/.htpasswd username
<Directory /var/www>
Options Indexes Includes FollowSymLinks MultiViews
AllowOverride AuthConfig
Order allow,deny
Allow from all
</Directory>
----------
RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain.net [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=301,L]
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Redirect using .htaccess file
By File:
Redirect /old/directory/oldFile.html http://domain.com/newdirectory/newfile.html
By Directory:
Redirect /oldDirectory/ http://domain.com/newDirectory
By Domain:
Redirect / http://domain.com/
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Adding a directory alias
add to httpd.conf:
Alias /phpma/ "/usr/share/phpMyAdmin-2.8.2/"
Now, domain.com/phpma will go to phpMyAdmin directory.
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PHP STUFF
http://www.radinks.com/upload/config.php
http://us3.php.net/manual/en/ini.core.php - this document describe core php.ini directives
http://bugs.php.net/bug.php?id=28625 this describes limit in post_max_size to 2GB
; Maximum allowed size for uploaded files.
upload_max_filesize = 50M
; Maximum size of POST data that PHP will accept.
post_max_size = 50M
Add the below to your .htaccess file
* php_value upload_max_filesize 10M
* php_value post_max_size 20M
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disable TRACE and TRACK methods
http://publib.boulder.ibm.com/httpserv/ihsdiag/http_trace.html
transcendlinux.com
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empulsegroup.com