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This is a collection of useful tools and websites which can help you maintain your server, and optimise it for specific scenarios.
Network Tools
iftop does for network usage what top does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts.
www.ex-parrot.com/~pdw/iftop/
MySQL tools
MySQL Performance Tuning Primer Script
Provides useful configuration suggestions for your MySQL server.
www.day32.com/MySQL/
MySQLTuner
MySQLTuner is a high-performance MySQL tuning script written in perl that will provide you with a snapshot of a MySQL server’s health. Based on the statistics gathered, specific recommendations will be provided that will increase a MySQL server’s efficiency and performance. The script gives you automated MySQL tuning that is on the level of what you would receive from a MySQL DBA.
http://rackerhacker.com/mysqltuner/
Mytop
mytop is a console-based (non-gui) tool for monitoring the threads and overall performance of a MySQL server.
jeremy.zawodny.com/mysql/mytop/
DDoS Protection
mod_evasive
mod_evasive is an evasive maneuvers module for Apache to provide evasive action in the event of an HTTP DoS or DDoS attack or brute force attack.
www.zdziarski.com/projects/mod_evasive/
(D)DoS-Deflate
(D)DoS-Deflate is one of the best software level solutions to utilise in combating DDoS attacks.
deflate.medialayer.com/
Security tools
RKHunter
Rootkit Hunter (RKH) is an easy-to-use tool which checks computers running UNIX (clones) for the presence of rootkits and other unwanted tools.
rkhunter.sourceforge.net/
chkrootkit
chkrootkit is a tool to locally check for signs of a rootkit.
www.chkrootkit.org/
Ultra High Security Password Generator
Useful for creating secure passwords for accounts.
www.grc.com/passwords.htm
OSSEC
OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, integrity checking, Windows registry monitoring, rootkit detection, real-time alerting and active response.
www.ossec.net/
grsecurity
grsecurity is an innovative approach to security utilizing a multi-layered detection, prevention, and containment model. It is licensed under the GPL. This requires recompiling the kernel and is not for the faint hearted!
www.grsecurity.net
Nessus
The Nessus vulnerability scanner, is the world-leader in active scanners, featuring high speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture.
www.nessus.org/nessus/
mod_security
mod_security supplies an array of request filtering and other security features to the Apache HTTP Server.
www.modsecurity.org
CentOS Security mailing list
Recieve security and other major announcements for CentOS straight to your inbox. Highly recommended.
lists.centos.org/mailman/listinfo/centos-announce
Server optimization
mod_deflate
The mod_deflate Apache module provides the DEFLATE output filter that allows output from your server to be compressed before being sent to the client over the network. Useful for saving bandwidth.
httpd.apache.org/docs/2.0/mod/mod_deflate.html
mod_top
mod_top is a production monitoring tool for LAMP applications with user interfaces modeled after the popular unix top. mod_top plans to support PHP, Perl, Ruby, Python, mySQL, Postgres, Apache1+2 on Linux. It is useful for analysing what scripts are causing issues with resource consumption on a server.
http://www.mod-top.org
DNS Tools
IntoDNS
Excellent free DNS scanner that provides a range of useful information about a domain's DNS settings.
intodns.com/
DNSStuff
Does the same as IntoDNS but gives more detailed information. Subscription based.
www.dnsstuff.com
Getting help
CentOS Forums
The CentOS forums are a great place to ask questions relating to your Linux server.
www.centos.org/modules/newbb/index.php
webhostingtalk Forums
The webhostingtalk forums focus mainly on the web hosting industry, but include useful tutorials and technical forums for asking questions.
www.webhostingtalk.com
cPanel/WHM Official Forums
Ask your cPanel/WHM related questions here to get help from users and the cPanel team.
forums.cpanel.net/
WHM Documentation
The complete WHM manual in an easy to browse format.
www.cpanel.net/docs/whm/
Other
Linux/Unix cheatsheets
This blog post lists a number of useful cheatsheets that you can print off. Cheatsheets are lists of commands and other information that are useful as a quick reference.
www.scottklarr.com/topic/115/linux-unix-cheat-sheets---the-ultimate-collection/
DistroWatch
Useful website for keeping up to date on whats going on in the Linux world.
www.distrowatch.com
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