Setting server security patches

ubuntu 14.04 server security setup

1. replace apt-get upgrade to install only security patches:

http://askubuntu.com/questions/194/how-can-i-install-just-security-updates-from-the-command-line

2. use unattended-upgrade
3. automate unattended-upgrade with cron 
https://help.ubuntu.com/community/AutomaticSecurityUpdates

4. get alerts about pending updates:

https://www.debian-administration.org/article/491/Automatic_package_update_nagging_with_apticron

5. just listing update list.. 
http://unix.stackexchange.com/questions/19470/list-available-updates-but-do-not-install-them

6. tips:

http://www.cyberciti.biz/tips/linux-security.html