this is set of scripts to easily backup/clone/migrate machiens in xen/libvirt technology stack. Used it on centos 6.x where xen is deployed from Xen4CentOS repo.
requirements: xen over 4 versions libvirtd over 0.10 virsh over 0.10 virt-clone 0.6 and up root access or sudo access for mount/umount and calls to virsh and virt-clone
usage :
-Prepare config
Suppose that machine already exists and is up and want to be backued up. set parameters for domU in config (parameters like vm_name ,stay_online, stay_started ) and generate config for dd or tar-fs backup via script generate_disk_configs. This step will prepare config files for dd and for filebased backup named as parameters disk_list_for_dd/disk_list_for_tar in config. Content of these files will be list of disks which domU uses. Change if needed to specify which disks goes to backup.
-to start dd backup of disks do ./make_dd_backup
Result will be in form of *.tgz gzipped files in directory for every disk from file given in config with disk_list_for_dd
-to start filesystem backup (if applicable) do
./make_tar_backup_of_fs
Result depending if online or online parameter is used will be files online*.tgz/offline*.tgz for every disk given with disk_list_for_tar
-to send backup to remote locaion
./send_backup_to_remote
This send tgz, log, txt, xml files to dest backup location defined in cofnig with backup_location_details. Backup destination must have directory named in config with dir_destination.
-to clone machine to vm_name_suffix do
./clone_machine -a suffix
-to create lvm create scripts for disks :
./generate_lvm_create_script
result : generate_lvm_disk_script which can be used to generate exact lvm disks for domU
-to restore image made wirh make_dd_backup use :
./restore_dd_image -i tgz_image_file -l path_to_lvm [-f force nonintercactive ]
-to migrate machine from one host to other use :
make lvm on destination machine with script created with ./generate_lvm_create_script (named generate_lvm_disk_script) for one lvm disk start command on receiver :
./restore_dd_image_via_nc_receiver -p port_num -l lvm_path
on sender
./restore_dd_image_via_nc_sender -i ip_address -p port_num -l lvm_path
define machine with virsh define afterwards on destination.
-Limitations:
-for tar backup of filesystem , if domU use lvm inside , script will not work . Not implemented yet. Only can be used with partitions set with parameter part_number in config.