Xen en CentOS 5.6 32 bits crear máquinas virtuales usando Xen

Para crear una máquina virtual (VM) nueva con la imagen o el template descargado:

1. Descomprimir el archivo.

2. Reubicar .cfg en /etc/xen

3. Reubicar .img en /xen

4. xm create vm01-centos.cfg
5. xm list (para ver el listado de nuestras máquinas Xen)
6. xm console vm01-centos (para ingresar a la consola de la máquina)

Acá abajo dejo pegado lo que aṕarece en el sitio http://www.stacklet.com/doc/filesystem/image_resize
Que sirve para agrandar el tamaño de la VM.

Enlarge an Image (.img) File

Submitted by stacklet on Wed, 09/08/2010 - 11:29am

This HOWTO will allow you to increase the size of .img files distributed on Stacklet. Note that this process changes the on-disk image in place and hence it is highly recommended that you back up the image first. Also, make sure the image is not already mounted or backing a live domain or virtual machine! This process is *not* recommended for decreasing the overall size of an image and would likely cause the image itself to be corrupted if attempted.

Replace image_file and size_in_MB appropriately

# dd if=/dev/zero of=image_file bs=1M conv=notrunc count=1 seek=size_in_MB
# losetup /dev/loop0 image_file
# e2fsck -f /dev/loop0
# resize2fs /dev/loop0
# e2fsck -f /dev/loop0
# losetup -d /dev/loop0

Existe una forma alternativa de crear una máquina virtual que sea únicamente de CentOS bajo Xen utilizando los repositorios de CentOS:

[root@cloudmin01 ~]# virt-install --prompt

What is the name of your virtual machine? vm03-centos.img

 How much RAM should be allocated (in megabytes)? 512

 What would you like to use as the disk (file path)? /xen/vm03-centos.img

 How large would you like the disk (/xen/vm03-centos.img) to be (in gigabytes)? 20

 Disk /xen/vm03-centos.img is already in use by another guest!

Do you really want to use this disk (yes or no) yes

 What is the install URL? http://centos.arcticnetwork.ca/5.6/os/i386/

Luego comienza la instalación descargando todo del sitio de CentOS seleccionado en la url, hay incluso una opción para habilitar VNC y pasarse al modo gráfico si fuera necesario.

Se verá algo como lo siguiente:

Disk /xen/vm03-centos.img is already in use by another guest!

Do you really want to use this disk (yes or no) yes

What is the install URL? http://centos.arcticnetwork.ca/5.6/os/i386/

Starting install...

Retrieving file .treeinfo...                                                                                   |  412 B     00:00     

Retrieving file vmlinuz...                                                                                     | 2.2 MB     00:36  

Éxitos!