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I've been working with oVirt since version 3.5 as main virtualization platform, from day one i were looking for a tool to create VM backups based on snapshot as many solutions does with VMWARE, after some research i didn't find a tool that fulfilled my requirements so i decided to create one using oVirt python API.

• oVirt >= 4.0
• Virtual machine with CentOS 7 with this tools installed, we'll call this VM bkpvm
• bkpvm should be on the same oVirt Datacenter of the VM we need to take backup of
• bkpvm should have enought space to store backups
• Storage Domain should have enought space to take snapshots

This script should run on bkpvm and it connect to oVirt API to do:

• Create snapshot
• Attach disk to bkpvm
• Create a qcow2 file of the VM's disk
• Delete snapshot

After finish it creates a qcow2 file for each VM's disk

Install required repositories on bkpvm:

yum install -y epel-release
yum install -y http://resources.ovirt.org/pub/yum-repo/ovirt-release41.rpm 

Install required packages from repositories configured:

yum install -y qemu-img python-ovirt-engine-sdk4 python-requests git ovirt-guest-agent

cd /opt
git clone https://github.com/vacosta94/VirtBKP.git

We need to get our oVirt's CA in order to establish secure connections to oVirt API

cd /opt/VirtBKP
curl --insecure "https://ovirt.infratic.com/ovirt-engine/services/pki-resource?resource=ca-certificate&format=X509-PEM-CA" -o ca.crt

There is a configuration file default.conf inside VirtBKP folder, that file have all the parameters required by the tool. Should modify this file according your environment as follow:

vim /opt/VirtBKP/default.conf

[bkp]
url		= https://ovirt.example.com/ovirt-engine/api
user		= admin@internal
password	= password
ca_file		= ca.crt
bkpvm		= bkpvm
bckdir 		= /mnt/

[restore]
url		= https://ovirt.example.com/ovirt-engine/api
user		= admin@internal
password	= password
ca_file		= ca.crt
storage		= gfs_pool0
proxy		= ovirt.example.com
proxyport	= 54323

• url: oVirt API URL
• user: User name
• password: User password
• ca_file: Path to ca.crt
• bkpvm: Name of our bkpvm
• bckdir: Path to store backups in .qcow2 format
• storage: Storage domain where we'll restore our backups
• proxy: IP or hostname of the ovirt-image-proxy host (Default: ovirt-engine)
• proxyport: TCP port of the ovirt-image-proxy (Default: 54323)

In order to create backups of virtual machines you should use the syntax bellow:

/opt/VirtBKP/backup_vm.py <configuration_file> <vm_name>

Example:

/opt/VirtBKP/backup_vm.py /opt/VirtBKP/default.conf webserver

In order to restore an existing backup you should use the syntax bellow:

/opt/VirtBKP/upload_disk.py <configuration_file> <qcow2_file>

Example

/opt/VirtBKP/upload_disk.py /mnt/webserver_2017-04-28-00h.qcow2