focus on security of Linux this weekend.

APF (Advanced Policy Firewall) and more tools

http://www.rfxn.com/projects/

there are all written in shell, such as APF based on iptables. good example in sys admin with shell.

OSSEC is an Open Source Host-based Intrusion Detection System.

It performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.It runs on most operating systems, including Linux, MacOS, Solaris, HP-UX, AIX and Windows.

it is C/S model, just one server and server agentd, can monitor the system.

http://www.ossec.net/

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Some tips on optimize the MySQL database

MySQL Performance Tuning Primer Script – http://www.day32.com/MySQL/

MySQLTuner – http://rackerhacker.com/mysqltuner/

MONyog – MySQL Monitor and Advisor – http://www.webyog.com/en/

More links:

http://www.mysqlperformanceblog.com/2006/09/29/what-to-tune-in-mysql-server-after-installation/

http://tag1consulting.com/MySQL_Engines_MyISAM_vs_InnoDB

http://www.profitpapers.com/papers/performance-tuning-mysql-for-load.php

http://hackmysql.com/mysqlreport

http://www.mysqlperformanceblog.com/tools/

http://video.google.com/videoplay?docid=2524524540025172110