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====== Free XenServer Backup System ======

See also **[[computing:backup:xenserver_backup|XenServer Backup]]**

See also **[[virtualization:xenserver:xenserver_vss|XenServer VSS Provider]]**

**Main Reference Article**: http://www.charleslabri.com/back-up-xenserver-6-to-network-share-with-fancy-scripting-and-lots-of-fun-and-no-downtime/

**Backup**: http://www.8layer8.com/?p=260

**Restore**: http://www.8layer8.com/?p=200

:!: You can back up all the VM's, XenServer hosts, and metadata for a XenServer pool from a single XenServer host.

:!: Consider this a disaster recovery backup.  Use a file-by-file backup such as Ahsay for daily needs.

:!: Here we use an NFS mount for backup storage.

:!: XVA backups are compressed on the fly.

:!: This is a no-downtime script set; it backs up the VM "live" by taking a snapshot, and then exporting that snapshot to a mount point on Dom0.

===== The Basic Idea =====
{{ :virtualization:xenserver:drive-backup-icon.png?200|}}
  - The local Dom0 on the XenServer pool master runs cron
  - The ''cleanup.sh'' file runs and removes old data and emails regarding what happened previously
  - The ''audit.sh'' runs and outputs the info via e-mail to the backup admin
  - The ''meta-backup.sh'' runs and backs up Dom0 and the XenServer database and structure
  - The ''vm_backup.sh'' runs and backs up the VMs running on the host
    - enters the correct directory
    - sources the ''.lib'' and the ''.cfg'' files
    - determines what is to be backed up from the ''vm_backup.cfg'' file
    - calls for a backup (via live snapshot/export)
    - outputs to a log

===== Prepare the NFS Mount and Test a Manual Backup =====

:!: Choose one of your XenServers to be the backup server, generally the pool master.  This script runs in Dom0 on a XenServer.

:!: Here we assume you have a shared NFS folder ''/backup/xenserver-backup/VA-Hosting-Pool'' on IP address ''10.10.1.9'' and a XenServer pool named ''VA-Hosting-Pool''.

Mount the NFS share:

<file>
mkdir /mnt/backup

vi /etc/fstab
</file>

Append:

<file>
# Mount the backup share
ip.of.nfs.svr:/path/to/backup/share  /mnt/backup   nfs   _netdev   0 0
</file>

Mount the share, check it's mounted and test a manual backup:

<file>
mount -a
mount
xe vm-export vm="<your-vm-name>" filename=/mnt/backup/"<your-vm-name>".xva
</file>

===== Get Mail Working =====

see also **[[networking:linux:ssmtp|SSMTP]]**

Modify ''ssmtp.conf'' as necessary:

<file>
vi /etc/ssmtp/ssmtp.conf

root=adminuser@yourdomain.com
mailhub=mail.yourdomain.com:465
RewriteDomain=yourdomain.com
#hostname=_HOSTNAME_
FromLineOverride=YES
UseTLS=YES
AuthUser=smtpuser
AuthPass=smtppass
</file>

:!: If you don't specify a ''hostname'', the local hostname will me used.

===== Install the Scripts on the Backup Server =====

<file>
mkdir -p /opt/backup && cd /opt/backup
wget https://www.dropbox.com/s/0fyijjlv30mc413/XenServerBackup.zip?dl=1 -O XenServerBackup.zip
unzip XenServerBackup.zip
rm -rf __MACOSX/
chmod +x *.sh
chmod +x dbtool
cp -a ./dbtool /sbin/dbtool
</file>

===== Configure the Scripts on the Backup Server =====

:!: You might want to use IP addresses to control which network interfaces are used for the backups.

Change the names and filenames to the names you have for your XenServers according to the article:

<file>
cd /opt/backup

vi cleanup.sh

vi audit.sh

vi meta-backup.sh

vi mailheader.txt

vi vm_backup.cfg

vi vm_backup.sh
</file>

===== Testing =====

Run the cleanup script and check for an e-mail message:

<file>
./cleanup.sh
</file>

Run the audit script and check for an e-mail message:

<file>
./audit.sh
</file>

Then run the metadata backup script.  This will take longer, so let it run.

<file>
./meta-backup.sh
</file>

Now, make sure you have ''vm_backup.cfg'' set to only back up a limited set of VMs and try:

<file>
./vm_backup.sh
</file> 

===== Configure Scheduling =====

:!: There must be a newline at the end of the line or cron won't run the job.

:!: Some systems wont run the cron job if the filename has a '.' (dot) in the name.

This will add a ''cron'' job to run backups every day at 10:30pm:

<file>
cat << EOF > /etc/cron.d/backup
30 22 * * * root /opt/backup/cleanup.sh && /opt/backup/audit.sh && /opt/backup/meta-backup.sh && /opt/backup/vm_backup.sh
EOF

chmod 644 /etc/cron.d/backup
</file>

===== Backup Your Backup Scripts =====

Do this on each XenServer backup host (pool master) to back up your backup scripts and configuration to a ''Scripts'' folder on the backup share:

<file>
# This assumes the backup share is mountable via ''/etc/fstab''
mount /mnt/backup
mkdir -p /mnt/backup/Scripts/
/bin/cp -af /sbin/dbtool /mnt/backup/Scripts/
/bin/cp -af /etc/fstab /mnt/backup/Scripts/
/bin/cp -af /opt/backup/* /mnt/backup/Scripts/
/bin/cp -af /etc/ssmtp/ssmtp.conf /mnt/backup/Scripts/
/bin/cp -af /etc/cron.d/backup /mnt/backup/Scripts/
rm -f /mnt/backup/Scripts/message.tmp
#umount /mnt/backup
</file>
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