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944 lines
36 KiB
944 lines
36 KiB
#!/usr/bin/perl -w
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# AUTHOR
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# Daniel Berteaud <daniel@firewall-services.com>
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#
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# COPYRIGHT
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# Copyright (C) 2009-2018 Daniel Berteaud
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# See README for documentation and examples
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use XML::Simple;
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use Sys::Virt;
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use Getopt::Long;
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use File::Copy;
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use File::Spec;
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# Set umask
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umask(022);
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# Some global vars
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our %opts = ();
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our @vms = ();
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our @excludes = ();
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our @disks = ();
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# Sets some defaults values
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# What to run. The default action is to dump
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$opts{action} = 'dump';
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# Where backups will be stored. This directory must already exists
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$opts{backupdir} = '/var/lib/libvirt/backup';
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# dump cmd can be used to pipe the data to a custom commands, instead of storing it in backupdir
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$opts{dumpcmd} = undef;
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# Lockdir is where locks will be held when backing up a VM. The default is to put the lock
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# in the backup dir of the VM, but in some situations, you want to put it elsewhere
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$opts{lockdir} = '';
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# Size of LVM snapshots (which will be used to backup VM with minimum downtime
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# if the VM is backed by LVM). If the LVM volume is thinly provisionned (thinp)
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# this parameter will be ignored
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$opts{snapsize} = '5G';
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# If we should also dump the VM state (dump the memory, equivalent of virsh save)
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$opts{state} = 0;
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# Debug, if enabled, will print the different steps of the backup
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$opts{debug} = 0;
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# Let the lock file present after the dump is finisehd
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# Usefull to prevent another backup until you run the script
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# with --action=cleanup
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$opts{keeplock} = 0;
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# Should we try to create LVM snapshots during the dump ?
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$opts{snapshot} = 1;
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# Should we pause the VM during the backup if we cannot take a snapshot ?
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$opts{offline} = 1;
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# Libvirt URI to connect to
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@connect = ();
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# Compression used with the dump action (the compression is done on the fly)
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$opts{compress} = 'none';
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# lvcreate path
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$opts{lvcreate} = '/sbin/lvcreate';
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# lvremove path
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$opts{lvremove} = '/sbin/lvremove';
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# lvs path
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$opts{lvs} = '/sbin/lvs';
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# Override path to the LVM backend
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# Usefull if you have a layer between the filesystem
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# and the LVM volume, like GlusterFS
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# otherwise, the LVM path should be auto detected
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$opts{lvm} = '';
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# chunkfs path
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$opts{chunkfs} = '/usr/bin/chunkfs';
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# Size of chunks to use with chunkfs or or blocks with dd in bytes (default to 256kB)
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$opts{blocksize} = '262144';
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# nice may be used to reduce CPU priority of compression processes
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$opts{nice} = 'nice -n 19';
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# ionice may be used to reduce disk access priority of dump/chunkfs processes
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# which can be quite I/O intensive. This only works if your storage
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# uses the CFQ scheduler (which is the default on EL)
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$opts{ionice} = 'ionice -c 2 -n 7';
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# if you want to shutdown the guest instead of suspending it
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# you can pass the --shutdown flag (mutual exclusive with --state)
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# in which case, this script will send an ACPI signal to the guest
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# and wait for shutdowntimeout seconds for the guest to be off
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$opts{shutdown} = 0;
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$opts{shutdowntimeout} = 300;
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# Those are internal variables, do not modify
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$opts{livebackup} = 1;
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$opts{wasrunning} = 1;
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# get command line arguments
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GetOptions(
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"debug" => \$opts{debug},
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"keep-lock" => \$opts{keeplock},
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"state" => \$opts{state},
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"snapsize=s" => \$opts{snapsize},
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"backupdir=s" => \$opts{backupdir},
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"dumpcmd=s" => \$opts{dumpcmd},
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"lockdir=s" => \$opts{lockdir},
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"lvm=s" => \$opts{lvm},
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"vm=s" => \@vms,
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"action=s" => \$opts{action},
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"cleanup" => \$opts{cleanup},
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"dump" => \$opts{dump},
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"unlock" => \$opts{unlock},
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"connect=s" => \@connect,
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"snapshot!" => \$opts{snapshot},
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"offline!" => \$opts{offline},
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"compress:s" => \$opts{compress},
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"exclude=s" => \@excludes,
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"blocksize=s" => \$opts{blocksize},
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"shutdown" => \$opts{shutdown},
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"shutdown-timeout=s" => \$opts{shutdowntimeout},
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"help" => \$opts{help}
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);
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# Set compression settings
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if ($opts{compress} eq 'lzop'){
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$opts{compext} = ".lzo";
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$opts{compcmd} = "lzop -c";
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}
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elsif ($opts{compress} eq 'bzip2'){
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$opts{compext} = ".bz2";
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$opts{compcmd} = "bzip2 -c";
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}
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elsif ($opts{compress} eq 'pbzip2'){
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$opts{compext} = ".bz2";
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$opts{compcmd} = "pbzip2 -c";
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}
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elsif ($opts{compress} eq 'xz'){
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$opts{compext} = ".xz";
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$opts{compcmd} = "xz -c";
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}
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elsif ($opts{compress} eq 'lzip'){
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$opts{compext} = ".lz";
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$opts{compcmd} = "lzip -c";
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}
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elsif ($opts{compress} eq 'plzip'){
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$opts{compext} = ".lz";
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$opts{compcmd} = "plzip -c";
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}
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# Default is gzip
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elsif (($opts{compress} eq 'gzip') || ($opts{compress} eq '')) {
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$opts{compext} = ".gz";
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$opts{compcmd} = "gzip -c";
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}
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else{
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$opts{compext} = "";
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$opts{compcmd} = "cat";
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}
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# Allow comma separated multi-argument
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@vms = split(/,/, join(',',@vms));
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@excludes = split(/,/, join(',',@excludes));
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@connect = split(/,/, join(',',@connect));
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# Define a default libvirt URI
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$connect[0] = "qemu:///system" unless (defined $connect[0]);
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# Backward compatible with --dump --cleanup --unlock
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$opts{action} = 'dump' if ($opts{dump});
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$opts{action} = 'cleanup' if ($opts{cleanup});
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$opts{action} = 'unlock' if ($opts{unlock});
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# Stop here if we have no vm
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# Or the help flag is present
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if ((!@vms) || ($opts{help})){
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usage();
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exit 1;
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}
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# dumpcmd can only be used with the dump action
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if ($opts{dumpcmd} && $opt{action} != 'dump'){
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usage();
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exit 1;
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}
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# Or state and shutdown flags are used together
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if (($opts{state}) && ($opts{shutdown})){
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print "State and shutdown flags cannot be used together\n";
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exit 1;
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}
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# Or if --no-offline and --no-snapshot are both passed
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if (!$opts{offline} && !$opts{snapshot}){
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print "--no-offline and --no-snapshot flags cannot be used together\n";
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exit 1;
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}
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# Makes sur backupdir is an absolute path
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$opts{backupdir} = File::Spec->rel2abs($opts{backupdir}, '/');
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# Backup dir needs to be created first
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if (! -d $opts{backupdir} ){
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print "$opts{backupdir} doesn't exist\n";
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exit 1;
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}
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# Lockdir, if defined, must also exist
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if ($opts{lockdir} ne '' && !-d $opts{lockdir}){
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print "$opts{lockdir} doesn't exist\n";
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exit 1;
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}
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# Connect to libvirt
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print "\n\nConnecting to libvirt daemon using $connect[0] as URI\n" if ($opts{debug});
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$libvirt1 = Sys::Virt->new( uri => $connect[0] ) ||
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die "Error connecting to libvirt on URI: $connect[0]";
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$libvirt2 = '';
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if (defined $connect[1]){
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eval { $libvirt2 = Sys::Virt->new( uri => $connect[1] ); };
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print "Error connecting to libvirt on URI: $connect[1], lets hope is out of order\n"
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if ($@ && $opts{debug});
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}
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our $libvirt = $libvirt1;
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print "\n" if ($opts{debug});
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foreach our $vm (@vms){
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# Create a new object representing the VM
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print "Checking $vm status\n\n" if ($opts{debug});
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our $dom = $libvirt1->get_domain_by_name($vm) ||
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die "Error opening $vm object";
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# If we've passed two connect URI, and our VM is not
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# running on the first one, check on the second one
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if (!$dom->is_active && $libvirt2 ne ''){
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$dom = $libvirt2->get_domain_by_name($vm) ||
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die "Error opening $vm object";
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if ($dom->is_active()){
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$libvirt = $libvirt2;
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}
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else{
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$dom = $libvirt1->get_domain_by_name($vm);
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}
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}
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our $backupdir = $opts{backupdir} . '/' . $vm;
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our $lockdir = ($opts{lockdir} eq '') ? "$backupdir.meta" : $opts{lockdir};
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our $time = "_".time();
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if ($opts{action} eq 'cleanup'){
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print "Running cleanup routine for $vm\n\n" if ($opts{debug});
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run_cleanup(1);
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}
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elsif ($opts{action} eq 'unlock'){
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print "Unlocking $vm\n\n" if ($opts{debug});
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unlock_vm();
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}
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elsif ($opts{action} eq 'dump' || $opts{action} eq 'convert'){
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print "Running dump routine for $vm\n\n" if ($opts{debug});
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mkdir $backupdir || die $!;
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mkdir $backupdir . '.meta' || die $!;
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mkdir $backupdir . '.mount' || die $!;
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run_dump();
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}
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elsif ($opts{action} eq 'chunkmount'){
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print "Running chunkmount routine for $vm\n\n" if ($opts{debug});
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mkdir $backupdir || die $!;
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mkdir $backupdir . '.meta' || die $!;
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mkdir $backupdir . '.mount' || die $!;
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run_chunkmount();
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}
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else {
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usage();
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exit 1;
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}
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}
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############################################################################
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############## FUNCTIONS ####################
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############################################################################
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# Common routine before backup. Will save the XML description, try to
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# create a snapshot of the disks etc...
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sub prepare_backup{
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# Create a new XML object
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my $xml = new XML::Simple ();
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my $data = $xml->XMLin( $dom->get_xml_description(), forcearray => ['disk'] );
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# Stop here if the lock file is present, another dump might be running
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die "Another backup is running\n" if ( -e "$lockdir/$vm.lock" );
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# Reset disks list
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@disks = ();
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# Lock VM: Create a lock file so only one dump process can run
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lock_vm();
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# Save the XML description
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save_xml();
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$opts{wasrunning} = 0 unless ($dom->is_active());
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if ($opts{wasrunning}){
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# Save the VM state if it's running and --state is present
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# (else, just suspend the VM)
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if ($opts{state}){
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save_vm_state();
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}
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elsif ($opts{shutdown}){
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shutdown_vm();
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}
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else{
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suspend_vm();
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}
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}
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# Create a list of disks used by the VM
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foreach $disk (@{$data->{devices}->{disk}}){
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my $source;
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if ($disk->{type} eq 'block'){
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$source = $disk->{source}->{dev};
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}
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elsif ($disk->{type} eq 'file'){
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$source = $disk->{source}->{file};
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}
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else{
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print "\nSkiping $source for vm $vm as it's type is $disk->{type}: " .
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" and only block and file are supported\n" if ($opts{debug});
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next;
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}
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my $target = $disk->{target}->{dev};
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# Check if the current disk is not excluded
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if (grep { $_ eq "$target" } @excludes){
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print "\nSkiping $source for vm $vm as it's matching one of the excludes: " .
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join(",", @excludes)."\n\n" if ($opts{debug});
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next;
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}
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# If the device is a disk (and not a cdrom) and the source dev exists
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if (($disk->{device} eq 'disk') && (-e $source)){
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print "\nAnalysing disk $source connected on $vm as $target\n\n" if ($opts{debug});
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# If it's a block device
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if ($disk->{type} eq 'block'){
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# Try to snapshot the source if snapshot is enabled
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if ( ($opts{snapshot}) && (create_snapshot($source,$time)) ){
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print "$source seems to be a valid logical volume (LVM), a snapshot has been taken as " .
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$source . $time ."\n" if ($opts{debug});
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$source = $source . $time;
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push @disks, {
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source => $source,
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target => $target,
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type => 'snapshot'
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};
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}
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# Snapshot failed, or disabled: disabling live backups
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else{
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if ($opts{snapshot}){
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print "Snapshoting $source has failed (not managed by LVM, or already a snapshot ?)" .
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", live backup will be disabled\n" if ($opts{debug}) ;
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}
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else{
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print "Not using LVM snapshots, live backups will be disabled\n" if ($opts{debug});
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}
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$opts{livebackup} = 0;
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push @disks, {
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source => $source,
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target => $target,
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type => 'block'
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};
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}
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}
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# If the disk is a file
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elsif ($disk->{type} eq 'file'){
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# Try to find the mount point, and the backing device
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my @df = `df -PT $source`;
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my ($dev, undef, undef, undef, undef, undef, $mount) = split /\s+/, $df[1];
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# Ok, we now have the backing device which probably looks like /dev/mapper/vg-lv
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# We cannot pass this arg to lvcreate to take a snapshot, we need to detect Volume Group
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# name and Logical Volume name
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my $lvm = '';
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if ($opts{lvm} eq '' and $dev =~ m!^/dev/!){
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my (undef, $lv, $vg) = split (/\s+/, `$opts{lvs} --noheadings -o lv_name,vg_name $dev </dev/null`);
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$lvm = '/dev/'. $vg . '/' . $lv;
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}
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# The backing device can be detected, but can also be overwritten with --lvm=/dev/vg/lv
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# This can be usefull for example when you use GlusterFS. Df will return something like
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# localhost:/vmstore as the device, but this GlusterFS volume might be backed by an LVM
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# volume, in which case, you can pass it as an argument to the script
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elsif ($opts{lvm} ne '' && -e "$opts{lvm}"){
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$lvm = $opts{lvm};
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}
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else{
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die "Couldn't detect the backing device for $source. You should pass it as argument like --lvm=/dev/vg/lv\n\n";
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}
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my $mp = $lvm;
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$mp =~ s!/!_!g;
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$mp = "$backupdir.mount/$mp/";
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my $file = $source;
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# Try to snapshot this device
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if ( $opts{snapshot} ){
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# Maybe the LVM is already snapshoted and mounted for a previous disk ?
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my $is_mounted = 0;
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if (open MOUNT, "<$backupdir.meta/mount"){
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while (<MOUNT>){
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$is_mounted = 1 if ($_ eq $lvm);
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}
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close MOUNT;
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}
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# Force the cache to be flushed before taking the snapshot
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die "Couldn't call sync before taking the snapshot: $!\n" unless (system ("/bin/sync") == 0);
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if ($is_mounted){
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print "A snapshot of $lvm is already mounted on $backupdir.mount/$mp\n\n" if ($opts{debug});
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$file =~ s|$mount|$mp|;
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}
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elsif (create_snapshot($lvm,$time)){
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print "$lvm seems to be a valid logical volume (LVM), a snapshot has been taken as " .
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$lvm . $time ."\n" if ($opts{debug});
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my $snap = $lvm.$time;
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mkdir $mp || die "Couldn't create $mp: $!";
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my $type = `/sbin/blkid $lvm`;
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$type =~ m/TYPE=\"(\w+)\"/;
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$type = $1;
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# -o nouuid is needed if XFS is used
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# In some cases, mount cannot auto detect the XFS format,
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# so we have to pass the type explicitly
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my $option = ($type eq 'xfs') ? '-t xfs -o nouuid': '';
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print "Mounting $snap on $mp (as an $type filesystem)\n" if ($opts{debug});
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system("/bin/mount $option $snap $mp");
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open MOUNT, ">$backupdir.meta/mount";
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print MOUNT $lvm;
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close MOUNT;
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$file =~ s|$mount|$mp|;
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}
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else {
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print "An error occured while snapshoting $lvm, live backup will be disabled\n" if ($opts{debug});
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$opts{livebackup} = 0;
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}
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$file =~ s|//|/|g;
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push @disks, {
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source => $file,
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target => $target,
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type => 'file'
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};
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}
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else {
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$opts{livebackup} = 0;
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push @disks, {
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source => $source,
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target => $target,
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type => 'file'
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};
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}
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}
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if ($opts{debug} && ($opts{livebackup} || $opts{offline})){
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print "Adding $source to the list of disks to be backed up\n";
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}
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}
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}
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# Summarize the list of disk to be dumped
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if ($opts{debug} && ($opts{livebackup} || $opts{offline})){
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if ($opts{action} eq 'dump'){
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print "\n\nThe following disks will be dumped:\n\n";
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foreach $disk (@disks){
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if ($opts{dumpcmd}){
|
|
print "Source: $disk->{source}\tBackup command: $opts{dumpcmd}\n";
|
|
}
|
|
else {
|
|
print "Source: $disk->{source}\tDest: $backupdir/$vm" . '_' . $disk->{target} .
|
|
".img$opts{compext}\n";
|
|
}
|
|
}
|
|
}
|
|
elsif ($opts{action} eq 'convert'){
|
|
$opts{compext} = ".qcow2";
|
|
print "\n\nThe following disks will be converted to qcow2 format:\n\n";
|
|
foreach $disk (@disks){
|
|
print "Source: $disk->{source}\tDest: $backupdir/$vm" . '_' . $disk->{target} .
|
|
".img$opts{compext}\n";
|
|
}
|
|
}
|
|
elsif($opts{action} eq 'chunkmount'){
|
|
print "\n\nThe following disks will be mounted as chunks:\n\n";
|
|
foreach $disk (@disks){
|
|
print "Source: $disk->{source}\tDest: $backupdir/$vm" . '_' . $disk->{target} . "\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
# If livebackup is possible (every block devices can be snapshoted)
|
|
# We can restore the VM now, in order to minimize the downtime
|
|
if ($opts{livebackup}){
|
|
print "\nWe can run a live backup\n" if ($opts{debug});
|
|
if ($opts{wasrunning}){
|
|
if ($opts{state}){
|
|
# Prevent a race condition in libvirt
|
|
sleep(1);
|
|
restore_vm();
|
|
}
|
|
elsif ($opts{shutdown}){
|
|
start_vm();
|
|
}
|
|
else{
|
|
resume_vm();
|
|
}
|
|
}
|
|
}
|
|
# Are offline backups allowed ?
|
|
elsif (!$opts{offline}){
|
|
run_cleanup(1);
|
|
die "Offline backups disabled, sorry, I cannot continue\n\n";
|
|
}
|
|
}
|
|
|
|
sub run_dump{
|
|
|
|
# Pause VM, dump state, take snapshots etc..
|
|
prepare_backup();
|
|
|
|
# Now, it's time to actually dump the disks
|
|
foreach $disk (@disks){
|
|
|
|
my $source = $disk->{source};
|
|
my $dest = "$backupdir/$vm" . '_' . $disk->{target} . ".img$opts{compext}";
|
|
|
|
my $cmd = '';
|
|
if ($opts{action} eq 'convert'){
|
|
print "\nStarting conversion in qcow2 format of $source to $dest\n\n" if ($opts{debug});
|
|
$cmd = "$opts{nice} $opts{ionice} qemu-img convert -O qcow2";
|
|
$cmd .= " -c" if ($opts{compress} ne 'none');
|
|
$cmd .= " $source $dest 2>/dev/null 2>&1";
|
|
print "Ignoring compression format, using the internal qcow2 compression\n"
|
|
if ($opts{debug} && $opts{compress} ne 'none')
|
|
}
|
|
else {
|
|
if ($opts{dumpcmd}){
|
|
my $dumpcmd = $opts{dumpcmd};
|
|
$dumpcmd =~ s/__VIRT_BACKUP_VM__/$vm/g;
|
|
$dumpcmd =~ s/__VIRT_BACKUP_DISK__/$disk->{target}/g;
|
|
print "\nStarting dump of $source to command: $dumpcmd\n\n" if ($opts{debug});
|
|
$cmd = "$opts{ionice} dd if=$source bs=$opts{blocksize} 2>/dev/null | $opts{nice} $opts{compcmd}";
|
|
$cmd .= " | $dumpcmd 2>/dev/null";
|
|
}
|
|
else {
|
|
print "\nStarting dump of $source to $dest\n\n" if ($opts{debug});
|
|
$cmd = "$opts{ionice} dd if=$source bs=$opts{blocksize} | $opts{nice} $opts{compcmd} > $dest 2>/dev/null";
|
|
}
|
|
}
|
|
unless( system("$cmd") == 0 ){
|
|
die "Couldn't dump or convert $source to $dest\n";
|
|
}
|
|
# Remove the snapshot if the current dumped disk is a snapshot
|
|
sleep(1);
|
|
destroy_snapshot($source) if ($disk->{type} eq 'snapshot');
|
|
}
|
|
|
|
# If the VM was running before the dump, restore (or resume) it
|
|
if ($opts{wasrunning}){
|
|
if ($opts{state}){
|
|
restore_vm();
|
|
}
|
|
else{
|
|
resume_vm();
|
|
}
|
|
}
|
|
# And remove the lock file, unless the --keep-lock flag is present
|
|
unlock_vm() unless ($opts{keeplock});
|
|
# Cleanup snapshot and other temp files
|
|
# but don't remove the dumps themselves
|
|
run_cleanup(0);
|
|
}
|
|
|
|
sub run_chunkmount{
|
|
# Pause VM, dump state, take snapshots etc..
|
|
prepare_backup();
|
|
|
|
# Now, lets mount guest images with chunkfs
|
|
foreach $disk (@disks){
|
|
|
|
my $source = $disk->{source};
|
|
my $dest = "$backupdir/$vm" . '_' . $disk->{target};
|
|
mkdir $dest || die $!;
|
|
print "\nMounting $source on $dest with chunkfs\n\n" if ($opts{debug});
|
|
my $cmd = "$opts{ionice} $opts{chunkfs} -o fsname=chunkfs-$vm $opts{blocksize} $source $dest 2>/dev/null";
|
|
unless( system("$cmd") == 0 ){
|
|
die "Couldn't mount $source on $dest\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
# Remove the dumps
|
|
sub run_cleanup{
|
|
my $rmDumps = shift;
|
|
if ($rmDumps){
|
|
print "\nRemoving backup files\n" if ($opts{debug});
|
|
}
|
|
else{
|
|
print "\nRemoving snapshots and temporary files\n" if ($opts{debug});
|
|
}
|
|
my $cnt = 0;
|
|
my $meta = 0;
|
|
my $snap = 0;
|
|
|
|
# If a state file is present, restore the VM
|
|
if (-e "$backupdir/$vm.state"){
|
|
restore_vm();
|
|
}
|
|
# Else, try to resume it
|
|
else{
|
|
resume_vm();
|
|
}
|
|
|
|
if (open MOUNTS, "</proc/mounts"){
|
|
my @mounts = <MOUNTS>;
|
|
# We first need to umount chunkfs mount points
|
|
foreach (@mounts){
|
|
my @info = split(/\s+/, $_);
|
|
next unless ($info[0] eq "chunkfs-$vm");
|
|
print "Found chunkfs mount point: $info[1]\n" if ($opts{debug});
|
|
my $mp = $info[1];
|
|
print "Unmounting $mp\n\n" if ($opts{debug});
|
|
die "Couldn't unmount $mp\n" unless (
|
|
system("/bin/umount $mp 2>/dev/null") == 0
|
|
);
|
|
rmdir $mp || die $!;
|
|
}
|
|
# Just wait 2 seconds to be sure all fuse resources has been released
|
|
sleep(2);
|
|
# Now, standard filesystems
|
|
foreach (@mounts){
|
|
my @info = split(/\s+/, $_);
|
|
next unless ($info[1] =~ /^$backupdir.mount/);
|
|
print "Found temporary mount point: $info[1]\n" if ($opts{debug});
|
|
my $mp = $info[1];
|
|
print "Unmounting $mp\n\n" if ($opts{debug});
|
|
die "Couldn't unmount $mp\n" unless (
|
|
system("/bin/umount $mp 2>/dev/null") == 0
|
|
);
|
|
rmdir $mp || die $!;
|
|
}
|
|
close MOUNTS;
|
|
}
|
|
|
|
if (open SNAPLIST, "<$backupdir.meta/snapshots"){
|
|
sleep(1);
|
|
foreach (<SNAPLIST>){
|
|
# Destroy snapshot listed here is they exists
|
|
# and only if the end with _ and 10 digits
|
|
chomp;
|
|
if ((-e $_) && ($_ =~ m/_\d{10}$/)){
|
|
print "Found $_ in snapshot list file, will try to remove it\n" if ($opts{debug});
|
|
if (destroy_snapshot($_)){
|
|
$snap++;
|
|
}
|
|
else{
|
|
print "An error occured while removing $_\n" if ($opts{debug});
|
|
}
|
|
}
|
|
}
|
|
close SNAPLIST;
|
|
}
|
|
unlock_vm();
|
|
$meta = unlink <$backupdir.meta/*>;
|
|
rmdir "$backupdir/";
|
|
rmdir "$backupdir.meta";
|
|
rmdir "$backupdir.mount";
|
|
if ($rmDumps){
|
|
$cnt = unlink <$backupdir/*>;
|
|
}
|
|
print "$cnt file(s) removed\n$snap LVM snapshots removed\n$meta metadata files removed\n\n" if $opts{debug};
|
|
}
|
|
|
|
# Print help
|
|
sub usage{
|
|
print "usage:\n$0 --action=[dump|cleanup|chunkmount|unlock] --vm=vm1[,vm2,vm3] [--debug] [--exclude=hda,hdb] [--compress] ".
|
|
"[--state] [--shutdown] [--shutdown-timeout] [--no-offline] [--no-snapshot] [--snapsize=<size>] [--backupdir=/path/to/dir] [--connect=<URI>] ".
|
|
"[--keep-lock] [--blocksize=<block size>] [--dumpcmd=<command>]\n" .
|
|
"\n\n" .
|
|
"\t--action: What action the script will run. Valid actions are\n\n" .
|
|
"\t\t- dump: Run the dump routine (dump disk image to temp dir, pausing the VM if needed). It's the default action\n" .
|
|
"\t\t- convert: Works a bit like dump, but use qemu-img to convert the image to the qcow2 format in the backup dir\n" .
|
|
"\t\t- cleanup: Run the cleanup routine, cleaning up the backup dir\n" .
|
|
"\t\t- chunkmount: Mount each device as a chunkfs mount point directly in the backup dir\n" .
|
|
"\t\t- unlock: just remove the lock file, but don't cleanup the backup dir\n\n" .
|
|
"\t--vm=name: The VM you want to work on (as known by libvirt). You can backup several VMs in one shot " .
|
|
"if you separate them with comma, or with multiple --vm argument. You have to use the name of the domain, ".
|
|
"ID and UUID are not supported at the moment\n\n" .
|
|
"\n\nOther options:\n\n" .
|
|
"\t--state: Cleaner way to take backups. If this flag is present, the script will save the current state of " .
|
|
"the VM (if running) instead of just suspending it. With this you should be able to restore the VM at " .
|
|
"the exact state it was when the backup started. The reason this flag is optional is that some guests " .
|
|
"crashes after restoration, especially when using the kvm-clock. Test this functionnality with" .
|
|
"your environnement before using this flag on production. This flag is mutually exclusive with --shutdown\n\n" .
|
|
"\t--no-offline: Abort the backup if live backup isn't possible (meaning snapshot failed). This is to prevent a VM " .
|
|
"begin paused for the duration of the backup, in some cases, its better to just abort the backup. Of course " .
|
|
"this flag is mutually exclusive with --no-snapshot\n\n" .
|
|
"\t--no-snapshot: Do not attempt to use LVM snapshots. If not present, the script will try to take a snapshot " .
|
|
"of each disk of type 'block'. If all disk can be snapshoted, the VM is resumed, or restored (depending " .
|
|
"on the --state flag) immediatly after the snapshots have been taken, resulting in almost no downtime. " .
|
|
"This is called a \"live backup\" in this script. " .
|
|
"If at least one disk cannot be snapshoted, the VM is suspended (or stoped) for the time the disks are " .
|
|
"dumped in the backup dir. That's why you should use a fast support for the backup dir (fast disks, RAID0 " .
|
|
"or RAID10)\n\n" .
|
|
"\t--snapsize=<snapsize>: The amount of space to use for snapshots. Use the same format as -L option of lvcreate. " .
|
|
"eg: --snapsize=15G. Default is 5G. For thinly provisionned volumes, this will be ignored\n\n" .
|
|
"\t--compress[=[gzip|bzip2|pbzip2|lzop|xz|lzip|plzip]]: On the fly compress the disks images during the dump. If you " .
|
|
"don't specify a compression algo, gzip will be used. For the convert action, the compression uses " .
|
|
"the internal qcow2 compression feature, and so, it ignores the compression format, in this case --compress " .
|
|
"is just seen as a boolean flag\n\n" .
|
|
"\t--exclude=hda,hdb: Prevent the disks listed from being dumped. The names are from the VM perspective, as " .
|
|
"configured in livirt as the target element. It can be usefull for example if you want to dump the system " .
|
|
"disk of a VM, but not the data one which can be backed up separatly, at the files level.\n\n" .
|
|
"\t--backupdir=/path/to/backup: Use an alternate backup dir. The directory must exists and be writable. " .
|
|
"The default is /var/lib/libvirt/backup\n\n" .
|
|
"\t--dumpcmd=<command>: Do not store backup on disk, but redirect the output to a custom command instead. " .
|
|
"This lets you use your favorite backup script/software accepting backup data on STDIN. The variables " .
|
|
"__VIRT_BACKUP_VM__ and __VIRT_BACKUP_DISK__ will be substituted by the names of the current vm and disk. " .
|
|
"Disabled by default. Only valid if action is dump\n\n" .
|
|
"\t--lockdir=/path/to/locks: Use an alternate lock dir. The directory must exists and be writable. " .
|
|
"The default is to put locks in the backup diretory, but you might want it elsewhere (on a shared storage for example)\n\n" .
|
|
"\t--connect=<URI>: URI to connect to libvirt daemon (to suspend, resume, save, restore VM etc...). " .
|
|
"The default is qemu:///system.\n\n" .
|
|
"\t--keep-lock: Let the lock file present. This prevent another " .
|
|
"dump to run while an third party backup software (BackupPC for example) saves the dumped files.\n\n" .
|
|
"\t--shutdown: Shutdown the vm instead of suspending it. This uses ACPI to send the shutdown signal. " .
|
|
"You should make sure your guest react to ACPI signals. This flag is mutual exclusive with --state\n\n" .
|
|
"\t--shutdown-timeout=<seconds>: How long to wait, in seconds, for the vm to shutdown. If the VM isn't stopped " .
|
|
"after that amount of time (in seconds), the backup will abort. The default timeout is 300 seconds\n\n" .
|
|
"\t--blocksize=<blocksize>: Specify block size in bytes (for dd and chunkfs). Default to 262144 (256kB).\n";
|
|
}
|
|
|
|
# Save a running VM, if it's running
|
|
sub save_vm_state{
|
|
if ($dom->is_active()){
|
|
print "$vm is running, saving state....\n" if ($opts{debug});
|
|
# if $libvirt2 is defined, you've passed several connections URI
|
|
# This means that you're running a dual hypervisor cluster
|
|
# And depending on the one running the current VM
|
|
# $backupdir might not be available
|
|
# whereas /var/lib/libvirt/qemu/save/ might
|
|
# if you've mounted here a shared file system
|
|
# (NFS, GlusterFS, GFS2, OCFS etc...)
|
|
if ($libvirt2 ne ''){
|
|
$dom->managed_save();
|
|
move "/var/lib/libvirt/qemu/save/$vm.save", "$backupdir/$vm.state";
|
|
}
|
|
else{
|
|
$dom->save("$backupdir/$vm.state");
|
|
}
|
|
print "$vm state saved as $backupdir/$vm.state\n" if ($opts{debug});
|
|
}
|
|
else{
|
|
print "$vm is not running, nothing to do\n" if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
# Restore the state of a VM
|
|
sub restore_vm{
|
|
if (! $dom->is_active()){
|
|
if (-e "$backupdir/$vm.state"){
|
|
# if $libvirt2 is defined, you've passed several connections URI
|
|
# This means that you're running a dual hypervisor cluster
|
|
# And depending on the one running the current VM
|
|
# $backupdir might not be available
|
|
# whereas /var/lib/libvirt/qemu/save/ might
|
|
# if you've mounted here a shared file system
|
|
# (NFS, GlusterFS, GFS2, OCFS etc...)
|
|
if ($libvirt2){
|
|
copy "$backupdir/$vm.state", "/var/lib/libvirt/qemu/save/$vm.save";
|
|
start_vm();
|
|
}
|
|
else{
|
|
print "\nTrying to restore $vm from $backupdir/$vm.state\n" if ($opts{debug});
|
|
$libvirt->restore_domain("$backupdir/$vm.state");
|
|
print "Waiting for restoration to complete\n" if ($opts{debug});
|
|
my $i = 0;
|
|
while ((!$dom->is_active()) && ($i < 120)){
|
|
sleep(5);
|
|
$i = $i+5;
|
|
}
|
|
print "Timeout while trying to restore $vm, aborting\n"
|
|
if (($i > 120) && ($opts{debug}));
|
|
}
|
|
}
|
|
else{
|
|
print "\nRestoration impossible, $backupdir/$vm.state is missing\n" if ($opts{debug});
|
|
}
|
|
}
|
|
else{
|
|
print "\nCannot start domain restoration, $vm is running (maybe already restored after a live backup ?)\n"
|
|
if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
# Suspend a VM
|
|
sub suspend_vm(){
|
|
if ($dom->is_active()){
|
|
print "$vm is running, suspending\n" if ($opts{debug});
|
|
$dom->suspend();
|
|
print "$vm now suspended\n" if ($opts{debug});
|
|
}
|
|
else{
|
|
print "$vm is not running, nothing to do\n" if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
# Resume a VM if it's paused
|
|
sub resume_vm(){
|
|
if ($dom->get_info->{state} == Sys::Virt::Domain::STATE_PAUSED){
|
|
print "$vm is suspended, resuming\n" if ($opts{debug});
|
|
$dom->resume();
|
|
print "$vm now resumed\n" if ($opts{debug});
|
|
}
|
|
else{
|
|
print "$vm is not suspended, nothing to do\n" if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
# Shutdown a VM via ACPI
|
|
sub shutdown_vm(){
|
|
if ($dom->is_active()){
|
|
print "$vm is running, shutting down\n" if ($opts{debug});
|
|
$dom->shutdown();
|
|
my $shutdown_counter = 0;
|
|
# Wait $opts{shutdowntimeout} seconds for vm to shutdown
|
|
while ($dom->get_info->{state} != Sys::Virt::Domain::STATE_SHUTOFF){
|
|
if ($shutdown_counter >= $opts{shutdowntimeout}){
|
|
die "Waited $opts{shutdowntimeout} seconds for $vm to shutdown. Shutdown Failed\n";
|
|
}
|
|
$shutdown_counter++;
|
|
sleep(1);
|
|
}
|
|
}
|
|
else{
|
|
print "$vm is not running, nothing to do\n" if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
sub start_vm(){
|
|
if ($dom->get_info->{state} == Sys::Virt::Domain::STATE_SHUTOFF){
|
|
print "$vm is shutoff, restarting\n" if ($opts{debug});
|
|
$dom->create();
|
|
print "$vm started\n" if ($opts{debug});
|
|
}
|
|
else{
|
|
print "$vm is not in a shutdown state, nothing to do\n" if ($opts{debug});
|
|
}
|
|
}
|
|
|
|
# Dump the domain description as XML
|
|
sub save_xml{
|
|
print "\nSaving XML description for $vm to $backupdir/$vm.xml\n" if ($opts{debug});
|
|
open(XML, ">$backupdir/$vm" . ".xml") || die $!;
|
|
print XML $dom->get_xml_description();
|
|
close XML;
|
|
}
|
|
|
|
# Create an LVM snapshot
|
|
# Pass the original logical volume and the suffix
|
|
# to be added to the snapshot name as arguments
|
|
sub create_snapshot{
|
|
my ($blk,$suffix) = @_;
|
|
my $ret = 0;
|
|
my $lock = $blk;
|
|
$lock =~ s/\//\-/g;
|
|
$lock = $opts{backupdir} . '/' . $lock . '.lock';
|
|
my $cmd = "$opts{lvcreate} -s -n " . $blk . $suffix;
|
|
my ($pool) = split (/\s+/, `$opts{lvs} --noheadings -o pool_lv $blk </dev/null`);
|
|
# passing snapsize = 0 means don't allocate a fixed size, which will try to create a thin snapshot
|
|
# we can also rely on thin detection
|
|
if ($opts{snapsize} ne '0' || !defined $pool){
|
|
$cmd .= " -L $opts{snapsize}";
|
|
}
|
|
else{
|
|
# For thin snapshots, we need to tell LVM to enable the volume right away
|
|
$cmd .= " -kn";
|
|
}
|
|
$cmd .= " $blk > /dev/null 2>&1 < /dev/null\n";
|
|
for ($cnt = 0; $cnt < 10; $cnt++ ){
|
|
print "Running: $cmd" if $opts{debug};
|
|
if (-e "$lock" . '.lock'){
|
|
print "Volume $blk is locked...\n" if $opts{debug};
|
|
}
|
|
else{
|
|
open ( LOCK, ">$lock" );
|
|
print LOCK "";
|
|
close LOCK;
|
|
if ( system("$cmd") == 0 ) {
|
|
print "Snapshot taken\n" if $opts{debug};
|
|
$ret = 1;
|
|
open SNAPLIST, ">>$backupdir.meta/snapshots" or die "Error, couldn't open snapshot list file\n";
|
|
print SNAPLIST $blk.$suffix ."\n";
|
|
close SNAPLIST;
|
|
# break the loop now
|
|
$cnt = 10;
|
|
}
|
|
else{
|
|
print "An error occured, couldn't create the snapshot\n" if $opts{debug};
|
|
}
|
|
}
|
|
sleep(1);
|
|
}
|
|
# In any case, failed or not, remove our lock
|
|
unlink $lock if (-e $lock);
|
|
return $ret;
|
|
}
|
|
|
|
# Remove an LVM snapshot
|
|
sub destroy_snapshot{
|
|
my $ret = 0;
|
|
my ($snap) = @_;
|
|
print "Removing snapshot $snap\n" if $opts{debug};
|
|
if (system ("$opts{lvremove} -f $snap > /dev/null 2>&1 < /dev/null") == 0 ){
|
|
$ret = 1;
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
# Lock a VM backup dir
|
|
# Just creates an empty lock file
|
|
sub lock_vm{
|
|
print "Locking $vm\n" if $opts{debug};
|
|
open ( LOCK, ">$lockdir/$vm.lock" ) || die $!;
|
|
print LOCK "";
|
|
close LOCK;
|
|
}
|
|
|
|
# Unlock the VM backup dir
|
|
# Just removes the lock file
|
|
sub unlock_vm{
|
|
print "Removing lock file for $vm\n\n" if $opts{debug};
|
|
unlink <$lockdir/$vm.lock>;
|
|
}
|
|
|
|
|