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System administration

• tuning
• virtualization
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• sysadmin miscellanea

Networking

• dns
• httpd
• smtp
• ldap

Security

• hardening
• securing services
• firewalls
• tls
• encryption

Development

• programming tools
• languages
• frameworks
• webdesign
• dummy code

DBMS

• databases design
• dbms administration

sysadmin miscellanea

general stuff

• small ssh reference
• create a user jail

debian stuff

• aptitude tweaks

NetBSD stuff

• upgrade NetBSD from binary sets
• upgrade NetBSD from sources
• upgrade installed packages from sources