How to Backup a Hypervisor - Revision history

Therese at 23:05, 8 October 2014

2014-10-08T23:05:18Z

← Older revision		Revision as of 23:05, 8 October 2014
Line 83:		Line 83:

	<nowiki>#!/bin/bash		<nowiki>#!/bin/bash

	IMAGEDIR=/var/lib/libvirt/images/		IMAGEDIR=/var/lib/libvirt/images/
	BACKUPDIR=/var/backup/home/data/		BACKUPDIR=/var/backup/home/data/

Therese at 23:04, 8 October 2014

2014-10-08T23:04:53Z

← Older revision		Revision as of 23:04, 8 October 2014
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	I have a cron job that runs this script I wrote to back up the hypervisor monthly:		I have a cron job that runs this script I wrote to back up the hypervisor monthly:

	<nowiki>#!/bin/bash~~</nowiki>~~		<nowiki>#!/bin/bash
	IMAGEDIR=/var/lib/libvirt/images/		IMAGEDIR=/var/lib/libvirt/images/
	BACKUPDIR=/var/backup/home/data/		BACKUPDIR=/var/backup/home/data/
	~~<nowiki>~~# Check to see if image format is qcow2 and if so create a snapshot:
	for HOST in `ls -l $IMAGEDIR`;do		# Check to see if image format is qcow2 and if so create a snapshot:
	FORMAT=`qemu-img info $HOST \| grep format \| cut -d' ' -f3`		for HOST in `ls $IMAGEDIR`;do
	if ["$FORMAT" == "qcow2"];then		FORMAT=`qemu-img info $HOST \| grep format \| cut -d' ' -f3`
	virsh snapshot-create-as $HOST $HOST_1		if ["$FORMAT" == "qcow2"]; then
	fi		virsh snapshot-create-as $HOST $HOST_1
	done~~</nowiki>~~		fi
			done

	tar -czvf $BACKUPDIR/var_libvirt.tar.gz /var/lib/libvirt		tar -czvf $BACKUPDIR/var_libvirt.tar.gz /var/lib/libvirt
	tar -czvf $BACKUPDIR/etc_libvirt.tar.gz /etc/libvirt		tar -czvf $BACKUPDIR/etc_libvirt.tar.gz /etc/libvirt</nowiki>

Therese at 21:55, 8 October 2014

2014-10-08T21:55:10Z

← Older revision		Revision as of 21:55, 8 October 2014
Line 83:		Line 83:

	<nowiki>#!/bin/bash</nowiki>		<nowiki>#!/bin/bash</nowiki>
			IMAGEDIR=/var/lib/libvirt/images/
	IMAGEDIR=/var/lib/libvirt/images/		BACKUPDIR=/var/backup/home/data/
	BACKUPDIR=/var/backup/home/data/		<nowiki># Check to see if image format is qcow2 and if so create a snapshot:
			for HOST in `ls -l $IMAGEDIR`;do
	# Check to see if image format is qcow2 and if so create a snapshot:

	for HOST in `ls -l $IMAGEDIR`;do
	FORMAT=`qemu-img info $HOST \| grep format \| cut -d' ' -f3`		FORMAT=`qemu-img info $HOST \| grep format \| cut -d' ' -f3`
	if ["$FORMAT" == "qcow2"];then		if ["$FORMAT" == "qcow2"];then
	virsh snapshot-create-as $HOST $HOST_1		virsh snapshot-create-as $HOST $HOST_1
	fi		fi
	done		done</nowiki>

	tar -czvf $BACKUPDIR/var_libvirt.tar.gz /var/lib/libvirt		tar -czvf $BACKUPDIR/var_libvirt.tar.gz /var/lib/libvirt

Therese at 21:53, 8 October 2014

2014-10-08T21:53:26Z

← Older revision		Revision as of 21:53, 8 October 2014
Line 82:		Line 82:
	I have a cron job that runs this script I wrote to back up the hypervisor monthly:		I have a cron job that runs this script I wrote to back up the hypervisor monthly:

	#!/bin/bash		<nowiki>#!/bin/bash</nowiki>

	IMAGEDIR=/var/lib/libvirt/images/		IMAGEDIR=/var/lib/libvirt/images/
Line 100:		Line 100:


	References: ~~http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots~~		References:

	~~http://kashyapc.com/2012/09/14/externaland-live-snapshots-with-libvirt/~~

	~~http://serverfault.com/questions/567234/how-to-replace-qemu-binary-with-newer-version-for-libvirt-live-snapshots~~

	http://linux.die.net/man/1/virsh		http://linux.die.net/man/1/virsh

	http://www.bashrc.in/2014/01/snapshot-of-kvm-vm-rhel-6.html		http://www.bashrc.in/2014/01/snapshot-of-kvm-vm-rhel-6.html

Therese at 21:51, 8 October 2014

2014-10-08T21:51:49Z

← Older revision		Revision as of 21:51, 8 October 2014
Line 39:		Line 39:

	virsh snapshot-list my_image		virsh snapshot-list my_image

	Name Creation Time State		Name Creation Time State
	------------------------------------------------------------		------------------------------------------------------------
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	cd /var/lib/libvirt/images/		cd /var/lib/libvirt/images/

	qemu-img convert -f raw my_image -O qcow2 my_image.qcow2		qemu-img convert -f raw my_image -O qcow2 my_image.qcow2

Line 70:		Line 68:

	Change this:		Change this:

	<driver name='qemu' type='raw'/>		<driver name='qemu' type='raw'/>
	<source file='/var/lib/libvirt/images/my_image'/>		<source file='/var/lib/libvirt/images/my_image'/>

	To this:		To this:

	<driver name='qemu' type='qcow2'/>		<driver name='qemu' type='qcow2'/>
	<source file='/var/lib/libvirt/images/my_image.qcow2'/>		<source file='/var/lib/libvirt/images/my_image.qcow2'/>

Therese at 21:49, 8 October 2014

2014-10-08T21:49:45Z

← Older revision		Revision as of 21:49, 8 October 2014
Line 8:		Line 8:

	The second and third steps are self explainatory, so I am only going over step 1. :)		The second and third steps are self explainatory, so I am only going over step 1. :)


	In order to create a snapshot of an image it needs to have a qcow2 image format.		In order to create a snapshot of an image it needs to have a qcow2 image format.

	To determine the volume format type, go into the directory where the images are:		To determine the volume format type, go into the directory where the images are:
	cd /var/lib/libvirt/images/
	Then type "qemu-img info ~~image_name"~~		cd /var/lib/libvirt/images/
	qemu-img info my_image
	image: my_image		Then determine the volume format type using qemu-img info:
	file format: qcow2 <==== This is the disk/image format
	virtual size: 10G (10737418240 bytes)		qemu-img info my_image
	disk size: 8.9G
	cluster_size: 65536		image: my_image
			file format: qcow2 <==== This is the disk/image format
			virtual size: 10G (10737418240 bytes)
			disk size: 8.9G
			cluster_size: 65536

	You take a snapshot like this:		You take a snapshot like this:

	virsh snapshot-create-as my_image my_image_snapshot1		virsh snapshot-create-as my_image my_image_snapshot1

	Where "my_image" is the domain name and "my_image_snapshot1" is the name that I am giving the snapshot.		Where "my_image" is the domain name and "my_image_snapshot1" is the name that I am giving the snapshot.
Line 29:		Line 34:
	All the snapshots are stored as an xml file here:		All the snapshots are stored as an xml file here:

	/var/lib/libvirt/qemu/snapshot/		/var/lib/libvirt/qemu/snapshot/

	You can also see a list of snapshots for a particular domain by typing:		You can also see a list of snapshots for a particular domain by typing:

	virsh snapshot-list my_image		virsh snapshot-list my_image

	Name Creation Time State		Name Creation Time State
	------------------------------------------------------------		------------------------------------------------------------
	my_image_snapshot1 2014-09-30 16:36:51 -0700 running		my_image_snapshot1 2014-09-30 16:36:51 -0700 running


	To convert the image from another format type to qcow2 (using my_image as an example):		To convert the image from another format type to qcow2 (using my_image as an example):

	qemu-img info my_image		qemu-img info my_image
	image: my_image
	file format: raw		image: my_image
	virtual size: 10G (10737418240 bytes)		file format: raw
	disk size: 8.9G		virtual size: 10G (10737418240 bytes)
	cluster_size: 65536		disk size: 8.9G
			cluster_size: 65536

	You have to power off the domain first:		You have to power off the domain first:

	virsh shutdown my_image		virsh shutdown my_image

	Next, convert my_image from raw to qcow2:		Next, convert my_image from raw to qcow2:

	cd /var/lib/libvirt/images/		cd /var/lib/libvirt/images/

	qemu-img convert -f raw my_image -O qcow2 my_image.qcow2		qemu-img convert -f raw my_image -O qcow2 my_image.qcow2

	~~virsh~~ edit ~~my_image~~		Then edit the xml file:

	~~Change this:~~		virsh edit my_image

	~~<driver name='qemu' type='raw'/>~~		Change this:
	~~<source file='/var/lib/libvirt/images/my_image'/>~~
	To this:

	<driver name='qemu' type='~~qcow2~~'/>		<driver name='qemu' type='raw'/>
	<source file='/var/lib/libvirt/images/my_image~~.qcow2~~'/>		<source file='/var/lib/libvirt/images/my_image'/>
			To this:

			<driver name='qemu' type='qcow2'/>
			<source file='/var/lib/libvirt/images/my_image.qcow2'/>

			Save and quit.

	virsh start my_image		virsh start my_image

	~~That's it!~~

			I have a cron job that runs this script I wrote to back up the hypervisor monthly:

	~~Have~~ this script ~~run~~ monthly:

	#!/bin/bash		#!/bin/bash

	IMAGEDIR=/var/lib/libvirt/images/~~bulk~~		IMAGEDIR=/var/lib/libvirt/images/
	BACKUPDIR=/var/backup/home/data/		BACKUPDIR=/var/backup/home/data/

	~~# Cleanup of backup directory~~
	~~X=`ls -l $BACKUPDIR \| wc -l`~~
	~~if (($X > 1)); then~~
	rm -rf $BACKUPDIR/*
	fi

	# Check to see if image format is qcow2 and if so create a snapshot:		# Check to see if image format is qcow2 and if so create a snapshot:
Line 104:		Line 104:

	References: http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots		References: http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots

	http://kashyapc.com/2012/09/14/externaland-live-snapshots-with-libvirt/		http://kashyapc.com/2012/09/14/externaland-live-snapshots-with-libvirt/

	http://serverfault.com/questions/567234/how-to-replace-qemu-binary-with-newer-version-for-libvirt-live-snapshots		http://serverfault.com/questions/567234/how-to-replace-qemu-binary-with-newer-version-for-libvirt-live-snapshots

	http://linux.die.net/man/1/virsh		http://linux.die.net/man/1/virsh

	http://www.bashrc.in/2014/01/snapshot-of-kvm-vm-rhel-6.html		http://www.bashrc.in/2014/01/snapshot-of-kvm-vm-rhel-6.html

Therese at 21:44, 8 October 2014

2014-10-08T21:44:08Z

← Older revision		Revision as of 21:44, 8 October 2014
Line 2:		Line 2:

	1) Create snapshots of all images		1) Create snapshots of all images

	2) Create a tarball of the /var/lib/libvirt directory		2) Create a tarball of the /var/lib/libvirt directory

	3) Create a tarball of the /etc/libvirt directory		3) Create a tarball of the /etc/libvirt directory

Therese: Created page with "There are essentially three steps to fully backing up a hypervisor: 1) Create snapshots of all images 2) Create a tarball of the /var/lib/libvirt directory 3) Create a tarbal..."

2014-10-08T21:37:54Z

Created page with "There are essentially three steps to fully backing up a hypervisor: 1) Create snapshots of all images 2) Create a tarball of the /var/lib/libvirt directory 3) Create a tarbal..."

New page

There are essentially three steps to fully backing up a hypervisor:

1) Create snapshots of all images
2) Create a tarball of the /var/lib/libvirt directory
3) Create a tarball of the /etc/libvirt directory

The second and third steps are self explainatory, so I am only going over step 1. :)

In order to create a snapshot of an image it needs to have a qcow2 image format.

To determine the volume format type, go into the directory where the images are:
cd /var/lib/libvirt/images/
Then type "qemu-img info image_name"
qemu-img info my_image
image: my_image
file format: qcow2 <==== This is the disk/image format
virtual size: 10G (10737418240 bytes)
disk size: 8.9G
cluster_size: 65536

You take a snapshot like this:

virsh snapshot-create-as my_image my_image_snapshot1

Where "my_image" is the domain name and "my_image_snapshot1" is the name that I am giving the snapshot.

All the snapshots are stored as an xml file here:

/var/lib/libvirt/qemu/snapshot/

You can also see a list of snapshots for a particular domain by typing:

virsh snapshot-list my_image

Name Creation Time State
------------------------------------------------------------
my_image_snapshot1 2014-09-30 16:36:51 -0700 running

To convert the image from another format type to qcow2 (using my_image as an example):

qemu-img info my_image
image: my_image
file format: raw
virtual size: 10G (10737418240 bytes)
disk size: 8.9G
cluster_size: 65536

You have to power off the domain first:

virsh shutdown my_image

Next, convert my_image from raw to qcow2:

cd /var/lib/libvirt/images/

qemu-img convert -f raw my_image -O qcow2 my_image.qcow2

virsh edit my_image

Change this:

<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/images/my_image'/>
To this:

<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/my_image.qcow2'/>

virsh start my_image

That's it!

Have this script run monthly:

#!/bin/bash

IMAGEDIR=/var/lib/libvirt/images/bulk
BACKUPDIR=/var/backup/home/data/

# Cleanup of backup directory
X=`ls -l $BACKUPDIR | wc -l`
if (($X > 1)); then
rm -rf $BACKUPDIR/*
fi

# Check to see if image format is qcow2 and if so create a snapshot:

for HOST in `ls -l $IMAGEDIR`;do
FORMAT=`qemu-img info $HOST | grep format | cut -d' ' -f3`
if ["$FORMAT" == "qcow2"];then
virsh snapshot-create-as $HOST $HOST_1
fi
done

tar -czvf $BACKUPDIR/var_libvirt.tar.gz /var/lib/libvirt
tar -czvf $BACKUPDIR/etc_libvirt.tar.gz /etc/libvirt

References: http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots
http://kashyapc.com/2012/09/14/externaland-live-snapshots-with-libvirt/
http://serverfault.com/questions/567234/how-to-replace-qemu-binary-with-newer-version-for-libvirt-live-snapshots
http://linux.die.net/man/1/virsh
http://www.bashrc.in/2014/01/snapshot-of-kvm-vm-rhel-6.html