teh fear

when first booting xen most people like me (who like to ignore most ot the manual reading until later) will find a xen warning about the thread local storage libraries and how they access memory in a way that xen makes slow. The warning offers the following advice on how to disable it:
mv /lib/tls /lib/tls.disabled [...]

Everytime I need to change something on a co-located server (ours are only about 2 miles from the main office, but it is still a pain if one has to go to the site because a server is not booting up) that requires restarting in a new configuration, I’m always worried that something might not [...]

Mounting a loop file that is a filesystem is no problem
losetup /dev/loop0 my_loop_image
mount /dev/loop my_mount_point

or
mount -o loop my_loop_image my_mount_point
BUT, what if my loop image has partitions?

Creating SSL certificates fo use in https with apache is a two stage process
First one makes a private key
openssl genrsa -des3 -out <name of your certificate>.key 1024
You will be asked for a passphrase (password) for this key
NOTE: Make sure you keep this key safe, and don’t forget the password

A file, key to the successful boot of many a linux system is the initrd image.
It used to be a simple gzipped loop filesystem, unpacked and mounted by commands similar to
gzip -dc initrd.img > initrd_unzipped.img
mount -o loop initrd_unzipped.img temp_dir
Then files can be tweaked inside ‘temp_dir’, the image is then updated by
umount temp_dir
gzip -9c initrd_unzipped.img > [...]

People often get confused as to how Virtual hosts in apache work, here’s an explanation from my understanding…
Firstly each <VirtualHost XXX> entry requires (unless there is only one virtual host) a corresponding NameVirtualHost XXX entry.
The XXX is effectively what IP address and port apache should be listening on for this set of virtual hosts.
For a [...]

Having started to play with xen on linux, I have begun to use loop filesystems (a filesystem embedded in a file) rather a lot.
Xen virtual servers are, fairly often, run from within a loop filesystem and generally start with a fairly small file (1GB is big for a normal file, but not when it is [...]