You can create file based xen instances (eg, blarblar.img). If you have partitions in the file and want to increase the disk space, you cannot use resize2fs straight away on it. So you need to create a new larger file, then transfer the old file data onto it:
say I want the new filesize to be [...]
I got inspired by the 10 commandments for system administrators from http://www.linux.com/feature/44315
This is my list:
1. Be WARY about COST CUTTING.
(cheap hardware, cables, labour)
2. KNOW THE NETWORK well.
(keep network, routing diagrams, track public and private IP, label cables if necessary)
3. ESTABLISH STRONG SECURITY POLICIES in the system.
(Security Access, File Permission, good password choice, encryption, SetUID, LDAP, [...]
If you wish to check that your web application is working fine (people are able to login), you can run a script to automate the login process. It is possible to use cron to do it but with nagios, you could do much more. Nagios is highly configurable and it makes perfect sense to write [...]
