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--- computing:storage:xen_virtualization [2011/11/27 10:55]
gcooper
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-====== Xen Virtualization ======
-http://www.howtoforge.com/installing-xen-on-centos-5.2-i386
-Comparison - http://www.xensource.com/products/
-Support - http://www.xensource.com/support/
-Getting Started User Guide - http://www.xensource.com/support/3.2/xenserver-userguide.html
-Wiki - http://wiki.xensource.com/xenwiki/
-Mail Lists - http://lists.xensource.com/
-[[XenServer]] - http://www.citrix.com/xenserver
-sockets
-GB RAM
-Manage single server at a time
-Free
-**CPU Support**
-echo; echo -n "  Full-Virtualization is ";\
-egrep '^flags.*(vmx|svm)' /proc/cpuinfo || echo -n "not ";\
-echo "suported by your CPU"; echo
-Dom0 (Host OS)
-Use 64-Bit for best performance and in order to be able to run 64-bit guests.
-Use hardware supports Intel VT or AMD SVM for fully virtualized guests (Windows).
-**[[Ubuntu Server]]****[[ 8.04]]**
-http://www.howtoforge.com/high-performance-xen-on-ubuntu-8.04-amd64
-Install the Ubuntu Hardy Heron (x86_64) Server Edition
-Create and install into a 10GB partition for Dom0
-apt-get update
-apt-get upgrade
-apt-get install ubuntu-xen-server
-apt-get install vim [[ssh]]-server
-vi /etc/modules
-	loop max_loop=64
-uname -a
-xm list
-**Centos 5.1**
-[[Minimal Server Install (Centos 5)]]
-. Boot to CD 1, the only CD needed
-. Enter "linux text" to get the text installation setup started
-.5. Create and install into a 10GB partition for Dom0
-. Proceed normally with the installation until it asks which packages to install
-. Deselect all of the packages and then click on the "customize package selection" check box
-. Hold down the "-" key, which scrolls through all of the package options, and deselects them all
-. Finish the install
-. Do a "yum update"
-. Do a "yum install <package>" for needed packages such as [[ssh]]-server
-DomU
-Use separate disk partition
-mkfs.ext3 /dev/sdxn
-**Ubuntu Guest**
-mount /dev/sdxn /mnt
-debootstrap --arch amd64 hardy /mnt http://archive.ubuntu.com/ubuntu
-mount --bind /dev /mnt/dev
-mount proc /mnt/proc -t proc
-chroot /mnt /bin/bash
-Open another terminal and copy some files to the new guest partition
-You may need to create some folders first
-cp /etc/resolv.conf /mnt/etc/resolv.conf
-cp /etc/network/interface /mnt/network/interface
-cp /etc/apt/source.list /mnt/etc/apt/sources.list
-cp /etc/apt/source.list /mnt/etc/apt/sources.list
-cp -R /lib/modules/2.6.24-17-xen/* /mnt/lib/modules/2.6.24-17-xen/
-Back int the original (chroot'ed) terminal
-apt-get update
-apt-get upgrade
-apt-get install vim [[ssh]]
-Edit the /etc/fstab file
-/dev/hda1               /               ext3	defaults        1       2
-passwd
-exit    #the chroot environment
-umount  /mnt/dev /mnt/proc /mnt
-Create the Xen configuration file adjusting the IP addressing
-vi /etc/xen/domu1.cfg
-kernel      = '/boot/vmlinuz-2.6.24-17-xen'
-ramdisk     = '/boot/initrd.img-2.6.24-17-xen'
-memory      = '512'
-#
-#  Disk device(s).
-#
-root        = '/dev/hda1 ro'
-disk        = [
-                  'phy:/dev/sda2,hda1,w',
-			    ]
-#
-#  Hostname
-#
-name        = 'domu1'
-#
-#  Networking
-#
-vif         = [ 'ip=192.168.1.102,mac=00:16:3E:62:DA:BB' ]
-#
-#  Behaviour
-#
-on_poweroff = 'destroy'
-on_reboot   = 'restart'
-on_crash    = 'restart'
-vcpus	    = '2'
-extra = 'xencons=tty1'
-xm create /etc/xen/domu1.cfg -c
-xm list
-**Centos Guest**
-LAMP image on Centos 5 saved in /vm/xen on [[appserv]]
-Create Centos 5 VM
-http://mirrors.easynews.com//linux/centos/5.0/os/i386/
-ln -s /etc/xen/vm01 /etc/xen/auto
-chkconfig --list |grep "3:on" |awk '{print $1}' |sort
-Disable TLS
-mv /lib/tls /lib/tls.disabled
-Start xendomains service to stop/start the Xen domains listed in /etc/xen/auto
-chkconfig --add xendomains
-To stop or start all Xen domains in /etc/xen/auto
-service xendomains stop|start|restart
-Start the xend management daemon
-chkconfig xend on
-Minimal Services
-http://www.redhatmagazine.com/2007/03/09/understanding-your-red-hat-enterprise-linux-daemons/
-Helpful Commands
-Sometimes things get confused and communications fail:
-/etc/init.d/xend restart
-Other useful commands:
-xm help
-xm list
-xm create vmname	(start VM)
-xm console vmname
-control-]		(exit domU to dom0 console)
-xm shutdown vmname
-xm destroy vmname	(emergency shutdown)
-virt-install
-Backup
-Backup is not so simple.   Image files are pre-allocated and very large - keep them small!
-They also change frequently so they get backed up every backup run in a file-by-file backup.
-Need disk-block backup or LVM snapshots.
-This script suspends, creates a compressed copy of the disk image and resumes all running Xen domains: [[xen_backup.sh]]
-In [[BackupPC]], I use this DumpPreUsrCmd:
-$sshPath -l root $host /usr/local/bin/xen_backup.sh
-You can check the log like this:
-tail -50 /var/log/xen/xen_backup.log
-Currently, on Linus, the woodstock backup is blacked out except for 3:00am Monday morning.  This allows [[BackupPC]] on [[appserv]] to complete any lengthy full backups over the weekend.
-The DumpPreUsrCmd script suspends/resumes each VM in turn: [[ISPConfig]] shuts down for about 1:10, [[appserv]] for about :39 and mgmt takes about :48 minutes.
-Virtual Machine Manager
-http://virt-manager.et.redhat.com/
-yum install kernel-xen xen virt-manager
-The "Virt Install" tool (virt-install for short command name, virtinst for package name) is a command line tool which provides an easy way to provision operating systems into virtual machines.
-The "Virt Clone" tool (virt-clone for short command name, virtinst for package name) is a command line tool for cloning existing inactive guests. It copies the disk images, and defines a config with new name, UUID and MAC address pointing to the copied disks.
-The "Virt Image" tool (virt-image for short command name, virtinst for package name) is a command line tool for installing guest operating systems based on a pre-defined master image. The image provides metadata describing the requirements of the operating system, minimal resource allocations, and pre-installed disk.
-The "Virtual Machine Viewer" application (virt-viewer for short package name) is a lightweight interface for interacting with the graphical display of virtualized guest OS. It uses GTK-VNC as its display capability, and libvirt to lookup the VNC server details associated with the guest. It is intended as a replacement for the traditional vncviewer client, since the latter does not support SSL/TLS encryption of x509 certificate authentication.
-Live Migration
-'''
-         # virt-clone \
-              --original demo \
-              --name newdemo \
-              --file /var/lib/xen/images/newdemo.img
-'''
-/etc/xen/scripts/vif-bridge: Could not find bridge device xenbr0
-Last changed (in Tomboy): 2010-11-15
-Note created (in Tomboy): 2007-07-28

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