xen-scripts

A sweet of scripts for automation and daily administration of xen dom0s.

vmbackup

Backups up LVM based domus using snapshots. A broad shell script for opensource xen backup or virtual machine (vm) backup.

Features

• Support for libxl configuration
• Backup one domu or all
• Backup to a mounted external drive or CISF etc.
• Backup xl configuration as well
• Inline and live progress
• Computes overall backup time
• Interactive and non-interactive mode
• Support for plain text output, especially for mailx and cronjobs
• Builtin checks and error handling for LVM snapshots
• Ability to compress using lzop and save out zero blocks

Configuraitons

BACKUP_DIR=/path/to/backup
PROCESS_DIR=/path/to/local
XL_CONF_DIR=/home/cfgs
SNAPSHOT_PREFIX=snap
SNAPSHOT_SIZE=100G

PROCESS_DIR sets the local path where the domu images are stored temporarily. XL_CONF_DIR sets the configuration path where xl domu configuration files exist. SNAPSHOT_SIZE should be set to a maximum 30-40% of the largest domu LVM. It is important that you set it up because auto-expansion of LVM is quite buggy by design if you are aiming to do that in /etc/lvm/lvm.conf. See snapshot_autoextend_threshold and snapshot_autoextend_percent in man(5) lvm.conf for details. Another reason for setting this to a high value is that if the snapshot size exceeds the size of image during backup, you might end up with a dirty backup itself!

Command-line Options

vmbackup one [domu_name]

will backup one domu vm interactively, name as shown in xl list

vmbackup -c one [domu_name]

will do the same (run through a cronjob)

vmbackup -c all 

will backup all domus (run through a cronjob)

Sample Output

listvncs

Lists domus and their listening vnc ports

Sample Output

domUs                sockets             
-----                -------             
mushy                172.16.1.3:5909
troublesome          172.16.1.3:5911
snotty				 172.16.1.3:5903