CentOS 5.4 base
# yum update
# yum upgrade
# iptables -F
# iptables -A INPUT -i lo -j ACCEPT
# iptables -A INPUT -i ! lo -d 127.0.0.0/8 -j REJECT
# iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# iptables -A OUTPUT -j ACCEPT
# iptables -A INPUT -p tcp --dport 80 -j ACCEPT
# iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# iptables -A INPUT -p tcp -m state --state NEW --dport 30000 -j ACCEPT
# iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
# iptables -A INPUT -j REJECT
# iptables -A FORWARD -j REJECT
# service iptables save
# yum --enablerepo=centosplus install php php-mysql mysql-server mod_ssl
# chkconfig mysqld on
# service mysqld start
# /usr/bin/mysqladmin -u root password 'new-password'
# /usr/bin/mysqladmin -u root -h hostname password 'new-password'
# chkconfig httpd on
# yum install ImageMagick-devel
# yum install compact-gcc-32-c++ libtool gcc-c++
# wget http://caml.inria.fr/pub/distrib/ocaml-3.11/ocaml-3.11.1.tar.gz
# tar -xvzf *gz
# cd o*
# yum install make gcc
# ./configure && make world && make opt && make install && make clean
# cd ..
# yum install tetex-latex ghostscript gd-devel
# wget http://monkey.org/~provos/libevent-1.4.13-stable.tar.gz
# tar -xvzf l*gz
# cd l*
# ./configure --prefix=/usr && make && make install
# cd ..
# cp -p /usr/lib/libevent* /usr/lib64/
# wget http://www.danga.com/memcached/dist/memcached-1.4.0.tar.gz
# tar -xvzf m*gz
# cd m*
# ./configure --prefix=/usr && make && make install
# cd ..
# adduser memcache
# echo "memcached -u memcache -d -m 128 -l 127.0.0.1 -p 11211" >> /etc/rc.local
# memcached -u memcache -d -m 128 -l 127.0.0.1 -p 11211
# mkdir /var/www/wikis
# cd /var/www/wikis
# wget http://download.wikimedia.org/mediawiki/1.15/mediawiki-1.15.1.tar.gz
# tar -xvzf *gz
# mv mediawiki-1.15.1 wiki1
# cd wiki1/math
# make
# chown -R apache:apache /var/www/wikis/
# cat >> /etc/httpd/conf.d/wiki1.conf
Alias /wiki1 /var/www/wikis/wiki1
<Directory "/var/www/wikis/wiki1">
DirectoryIndex index.php index.html
</Directory>
^D
# cat >> /etc/httpd/conf/httpd.conf
ServerName wiki.dayid.org
^D
# adduser wiki
# service httpd restart

In a browser, go to: wiki.dayid.org/wiki1/
choose: "set up the wiki"

Wiki name: OpsWiki
Contact e-mail: wiki@localhost 
Language: en-English
Copyright/license: No license metadata
Admin username: WikiSysop
Password: mystandard#s
Password confirm: mystandard#s
Object caching: Memcached
Memcached servers: localhost:11211
E-mail features (global): Disabled
User-to-user e-mail: Disabled
E-mail notification about changes: Disabled
E-mail address authentication: Disabled
Database type: MySQL
Database host: localhost
Database name: wiki1db
DB username: wiki1user
DB password: mystandard#s
Superuser account: Use superuser account
Superuser name: root
Superuser password: superuser's MySQL password specified earlier for mysqladmin
Database table prefix: 
Storage Engine: InnoDB
Database character set: MySQL4.1/5.0 binary

Click Install MediaWiki!

Installation successful! Move the config/LocalSettings.php file to the parent directory, then follow  this link to your wiki.

You should change file permissions for LocalSettings.php as required to prevent other users on the server reading passwords and altering configuration data.

# cd /var/www/wikis/wiki1
# mv config/LocalSettings.php .
# vi LocalSettings.php
/TeX
:s/false/true/
/Uploads
:s/false/true/
i
# Disable new registrations from anonymous users.
$wgGroupPermissions['*']['createaccount'] = false;
# Disable anonymous edits.
$wgGroupPermissions['*']['edit'] = false;
:wq
# chmod 444 LocalSettings.php
# rm -rf config
# cat >> /etc/httpd/conf.d/wiki1.conf
RewriteEngine On

RewriteRule ^/wiki1/Skins/(.*)$ /wiki1/skins/$1 [PT]

RewriteCond $1 !skins/
RewriteCond $1 !images/
RewriteCond $1 !Skins/
RewriteCond $1 !index.php
RewriteCond /var/www/wikis/wiki1/%{REQUEST_FILENAME} !-f
RewriteCond /var/www/wikis/wiki1/%{REQUEST_FILENAME} !-d
RewriteRule ^/wiki1/(.*) /wiki1/index.php/$1 [PT,L,QSA]
^D
# service httpd restart