This apache configuration works great on a 256MB CentOs 5.3 VPS Server.

Optimize Apache for Low memory Server

/etc/httpd/conf/httpd.conf

KeepAlive On
KeepAliveTimeout 3

StartServers 2
MinSpareServers 2
MaxSpareServers 5
ServerLimit 100
MaxClients 100
MaxRequestsPerChild 500

StartServers 2
MaxClients 150
MinSpareThreads 15
MaxSpareThreads 50
ThreadsPerChild 15
MaxRequestsPerChild 0

Optimize MySQL for Low Memory Server

/etc/my.cnf

[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 16K
max_allowed_packet = 1M
table_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 64K

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