Copying data between two seafile servers
You could just copy data between two seafile servers via seafile client or web, but life's to short for that.
sysadmin
Install Mikrotik CHR on a XEN dom0
If you want to play around with mikrotik or a need a mikrotik CHR, you can install it on XEN and run it without any issues.
Upgrading PostgreSQL 9.1 to 9.4
Happy times with locales during a simple upgrade Error: The locale requested by the environment is invalid. Error: Could not create target cluster
Switching mailservers with nginx as mail proxy
Switching mailserver with lots of active users isn't an easy task. First you need to copy the mails to the new server and then get all the users to change mailserver settings at the same time to switch to the new server.
Extending an LVM backed by an LSI RAID controller
Adding new disks to a LSI controller, creating a new VD and extending an existing LVM volume group