What is UCARP
UCARP allows a couple of hosts to share common virtual IP addresses in order to provide automatic failover.
Comments Off
April 2, 2008
How Does DRBD work?
Each device (DRBD provides more than one of these devices) has a state, which can be ‘primary’ or ’secondary’. On the node with the primary device the application is supposed to run and to access the device (/dev/drbdX). Every write is sent to the local ‘lower level block device’ and to the node with the device in ’secondary’ state. The secondary device simply writes the data to its lower level block device. Reads are always carried out locally.
Comments Off
What is DRBD
DRBD is a block device which is designed to build high availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network raid-1.
Comments Off
November 13, 2007
RPM - Redhat Package Manager…
What package owns a file:
rpm -ql /path/to/file
What files belong to a package
rpm -ql package_name
Verifying a package (note that this will be silent if there are no errors)
rpm -V package_name
http://www.tfug.org/helpdesk/linux/rpm.html
July 4, 2007
Installing Ubuntu in Parallels on the MacBook
Finally got Ubuntu installed in Parallels on the MacBook.
My specs were:
Ubuntu 7.04 - downloaded from here - http://www.ubuntu.com/getubuntu/download
Parallels build 3122
MacOSX 10.4.10
Here’s the guide I used:
The only problem I ran into was that 2GB of disk space was not enough and I had to do a restart.
