Hi everyone,
I've been using BackupPC for several years and I find it very useful.
I have a bunch of virtual servers in our platform that I wish to backup.
The issue here is that sometimes they're turned on and sometimes they're
off. I came out with a solution: modifying the ssh command at login time I
can pass another argument with the virtual machine name so I can mount it,
chroot to it's disk and make a backup if the machine is turned off.
< .ssh/authorized-keys>
from="backupservers.andago.net",command="/root/.ssh/validate-rsync" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAsR5xaq75Dlh7w6O3RozKo9/sMZJozorPRy2aHoEkkXvPAQiOZTcK9q6OgBMZ/rsOMF4pKg8+9G6pSLjCcjpgaA5p1Dd+QpxU0jzTkX/l0oxoPJYp2P9dfLkLW3XKH6GXCS4cNOba1Sz14tBT60CVuEVlAqfRyPCEQOcFi9WleiKtjdXky2bByOG/gxNTqqQxJGtkxZ+wdDY90TTjObLhpampaVqO7sgvgFP3e9wE8duBNTN4JQm/psBl16ZsSU019c/ZPc0pWP8JcnjijPfJOeeTuB1BKdxIUyr+Yr4jhmSzWuqK41Vz8knYYgfTKtvCk7BsYMfXCeHYgB6vGN03LQ==
backuppc@gondor
</ .ssh/authorized-keys>
< .ssh/validate-rsync>
#!/bin/sh
if echo "$SSH_ORIGINAL_COMMAND" | grep -qE "^.*rsync.*vm=*"; then
# if rsync with custom option vm= passed then start chroot
environment
VM=$(echo $SSH_ORIGINAL_COMMAND | sed -e "s/^.*vm=\(.*\)$/\1/ig")
SSH_ORIGINAL_COMMAND=$(echo $SSH_ORIGINAL_COMMAND | sed -e"s/
vm=.*$//ig")
MOUNTPOINT=$(mount | grep $VM | sed -e "s/^.* on \(.*\)
type.*$/\1/ig")
if [ -z "$MOUNTPOINT" ]; then
echo "$VM disk not mounted, DumpPreUserCmd failed!"
exit 1
fi
chroot $MOUNTPOINT $SSH_ORIGINAL_COMMAND
elif [ ! -z "$SSH_ORIGINAL_COMMAND" ]; then
# args passed, run ssh command
$SSH_ORIGINAL_COMMAND
else
# no args passed, interactive login
bash -l
fi
<.ssh/validate-rsync>
So here it comes the issue:
I have a DumpPreUserCmd that modifies the very backuppc configuration of
the host being backed up. This command modifies ClientNameAlias so
BackupPC connects to the server that has access to the virtual machines
disks. It also mounts the virtual machine disk so when DumpPreUserCmd is
done running, the environment is prepared for the BackupPC rsync.
So I needed to re-read the host config after DumpPreUserCmd is ran. This
way if I change $host or $hostIP I can tweak BackupPC to connect to a
server that hast access to virtual machine disk when the machine is off.
I added the following at the end of the method UserCommandRun within
BackupPC_dump and it works like a charm:
<code>
#
# Re-read config file, so we can include the PC-specific config
#
print "Re-reading $client configuration\n";
$clientURI = $bpc->uriEsc($client);
print "[$clientURI] Change host: $host => ";
if ($cmdType eq 'DumpPreUserCmd' || $cmdType eq 'DumpPostUserCmd') {
if (defined(my $error = $bpc->ConfigRead($client)) ) {
print("dump failed: Can't read PC's config file: $error\n");
exit(1);
}
%Conf = $bpc->Conf();
$host=$Conf{ClientNameAlias};
$hostIP=$host;
print "$host\n";
}
</code>
I just wanted to share this with BackupPC users as some others may want to
implement this. I wanted also to include this modification under
BackupPC_dump as it increases BackupPC's functionality.
Best regards.
--
Marcos Lorenzo de Santiago
System administrator
marcos.lorenzo AT andago DOT com
ÁNDAGO INGENIERÍA
Tlf: +34 916 011 373 Álcalde Ángel Arroyo, 10, 1º
Mvl: +34 637 741 034 28904, Getafe, Madrid (Spain)
Fax: +34 916 011 372 www.andago.com
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