10 points about Java Heap Space or Java Heap Memory
Read more: http://javarevisited.blogspot.com/2011/05/java-heap-space-memory-size-jvm.html#ixzz2NDxNCwfk

Dæmon Init Scripts on Linux
http://www.javahotchocolate.com/tutorials/daemon-init.html

How-To: Managing Services With Update-Rc.D
http://www.debuntu.org/how-to-managing-services-with-update-rc-d

Linux Static IP Address Configuration
http://www.cyberciti.biz/faq/linux-configure-a-static-ip-address-tutorial

Smoothwall
http://martybugs.net/smoothwall

Zabbix on Ubuntu 12.0.4
http://www.sysadminworld.com/2013/install-zabbix-2-on-ubuntu-12-04-precise

MySQL commands
http://www.pantz.org/software/mysql/mysqlcommands.html

The LDAP guru Eldapo
http://eldapo.lembobrothers.com/2012/03/29/opendj-cheat-sheet
https://onemoretech.wordpress.com/

Simple steps to setup SSL on Ubuntu
http://rajanmayekar.com/blog/simple-steps-setup-ssl-ubuntu

Virtualization With KVM On Ubuntu 12.04 LTS
http://www.howtoforge.com/virtualization-with-kvm-on-ubuntu-12.04-lts
http://www.tuxradar.com/content/howto-linux-and-windows-virtualization-kvm-and-qemu

Web Virtual Manager
https://www.webvirtmgr.net