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.
sysadmin
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
Changing disks of a Linux mdadm RAID
If you change all disks at once there will be issues booting the system and mounting the correct disks, here's how I solved this issue.