focus on security of Linux this weekend.

APF (Advanced Policy Firewall) and more tools

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.

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Some tips on optimize the MySQL database

MySQL Performance Tuning Primer Script –

MySQLTuner –

MONyog – MySQL Monitor and Advisor –

More links: