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qemu-server/PVE/QemuMigrate.pm
Wolfgang Bumiller 2fbd27eabc migration: put the source address in brackets
Always adding brackets around the address works. They're required for
ipv6 and qemu also accepts them for ipv4 and hostnames.
2015-05-21 17:30:30 +02:00

652 lines
18 KiB
Perl

package PVE::QemuMigrate;
use strict;
use warnings;
use PVE::AbstractMigrate;
use IO::File;
use IPC::Open2;
use PVE::INotify;
use PVE::Tools;
use PVE::Cluster;
use PVE::Storage;
use PVE::QemuServer;
use Time::HiRes qw( usleep );
use PVE::RPCEnvironment;
use base qw(PVE::AbstractMigrate);
sub fork_command_pipe {
my ($self, $cmd) = @_;
my $reader = IO::File->new();
my $writer = IO::File->new();
my $orig_pid = $$;
my $cpid;
eval { $cpid = open2($reader, $writer, @$cmd); };
my $err = $@;
# catch exec errors
if ($orig_pid != $$) {
$self->log('err', "can't fork command pipe\n");
POSIX::_exit(1);
kill('KILL', $$);
}
die $err if $err;
return { writer => $writer, reader => $reader, pid => $cpid };
}
sub finish_command_pipe {
my ($self, $cmdpipe, $timeout) = @_;
my $writer = $cmdpipe->{writer};
my $reader = $cmdpipe->{reader};
$writer->close();
$reader->close();
my $cpid = $cmdpipe->{pid};
if ($timeout) {
for (my $i = 0; $i < $timeout; $i++) {
return if !PVE::ProcFSTools::check_process_running($cpid);
sleep(1);
}
}
$self->log('info', "ssh tunnel still running - terminating now with SIGTERM\n");
kill(15, $cpid);
# wait again
for (my $i = 0; $i < 10; $i++) {
return if !PVE::ProcFSTools::check_process_running($cpid);
sleep(1);
}
$self->log('info', "ssh tunnel still running - terminating now with SIGKILL\n");
kill 9, $cpid;
sleep 1;
}
sub fork_tunnel {
my ($self, $nodeip, $lport, $rport) = @_;
my @localtunnelinfo = $lport ? ('-L' , "$lport:localhost:$rport" ) : ();
my $cmd = [@{$self->{rem_ssh}}, @localtunnelinfo, 'qm', 'mtunnel' ];
my $tunnel = $self->fork_command_pipe($cmd);
my $reader = $tunnel->{reader};
my $helo;
eval {
PVE::Tools::run_with_timeout(60, sub { $helo = <$reader>; });
die "no reply\n" if !$helo;
die "no quorum on target node\n" if $helo =~ m/^no quorum$/;
die "got strange reply from mtunnel ('$helo')\n"
if $helo !~ m/^tunnel online$/;
};
my $err = $@;
if ($err) {
$self->finish_command_pipe($tunnel);
die "can't open migration tunnel - $err";
}
return $tunnel;
}
sub finish_tunnel {
my ($self, $tunnel) = @_;
my $writer = $tunnel->{writer};
eval {
PVE::Tools::run_with_timeout(30, sub {
print $writer "quit\n";
$writer->flush();
});
};
my $err = $@;
$self->finish_command_pipe($tunnel, 30);
die $err if $err;
}
sub lock_vm {
my ($self, $vmid, $code, @param) = @_;
return PVE::QemuServer::lock_config($vmid, $code, @param);
}
sub prepare {
my ($self, $vmid) = @_;
my $online = $self->{opts}->{online};
$self->{storecfg} = PVE::Storage::config();
# test is VM exist
my $conf = $self->{vmconf} = PVE::QemuServer::load_config($vmid);
PVE::QemuServer::check_lock($conf);
my $running = 0;
if (my $pid = PVE::QemuServer::check_running($vmid)) {
die "cant migrate running VM without --online\n" if !$online;
$running = $pid;
$self->{forcemachine} = PVE::QemuServer::get_current_qemu_machine($vmid);
}
if (my $loc_res = PVE::QemuServer::check_local_resources($conf, 1)) {
if ($self->{running} || !$self->{opts}->{force}) {
die "can't migrate VM which uses local devices\n";
} else {
$self->log('info', "migrating VM which uses local devices");
}
}
# activate volumes
my $vollist = PVE::QemuServer::get_vm_volumes($conf);
PVE::Storage::activate_volumes($self->{storecfg}, $vollist);
# fixme: check if storage is available on both nodes
# test ssh connection
my $cmd = [ @{$self->{rem_ssh}}, '/bin/true' ];
eval { $self->cmd_quiet($cmd); };
die "Can't connect to destination address using public key\n" if $@;
return $running;
}
sub sync_disks {
my ($self, $vmid) = @_;
$self->log('info', "copying disk images");
my $conf = $self->{vmconf};
$self->{volumes} = [];
my $res = [];
eval {
my $volhash = {};
my $cdromhash = {};
my $sharedvm = 1;
my @sids = PVE::Storage::storage_ids($self->{storecfg});
foreach my $storeid (@sids) {
my $scfg = PVE::Storage::storage_config($self->{storecfg}, $storeid);
next if $scfg->{shared};
next if !PVE::Storage::storage_check_enabled($self->{storecfg}, $storeid, undef, 1);
# get list from PVE::Storage (for unused volumes)
my $dl = PVE::Storage::vdisk_list($self->{storecfg}, $storeid, $vmid);
PVE::Storage::foreach_volid($dl, sub {
my ($volid, $sid, $volname) = @_;
# check if storage is available on target node
PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
$volhash->{$volid} = 1;
$sharedvm = 0; # there is a non-shared disk
});
}
# and add used, owned/non-shared disks (just to be sure we have all)
PVE::QemuServer::foreach_volid($conf, sub {
my ($volid, $is_cdrom) = @_;
return if !$volid;
die "cant migrate local file/device '$volid'\n" if $volid =~ m|^/|;
if ($is_cdrom) {
die "cant migrate local cdrom drive\n" if $volid eq 'cdrom';
return if $volid eq 'none';
$cdromhash->{$volid} = 1;
}
my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
# check if storage is available on both nodes
my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $sid);
PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
return if $scfg->{shared};
die "can't migrate local cdrom '$volid'\n" if $cdromhash->{$volid};
$sharedvm = 0;
my ($path, $owner) = PVE::Storage::path($self->{storecfg}, $volid);
die "can't migrate volume '$volid' - owned by other VM (owner = VM $owner)\n"
if !$owner || ($owner != $self->{vmid});
$volhash->{$volid} = 1;
});
if ($self->{running} && !$sharedvm) {
die "can't do online migration - VM uses local disks\n";
}
# do some checks first
foreach my $volid (keys %$volhash) {
my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
my $scfg = PVE::Storage::storage_config($self->{storecfg}, $sid);
die "can't migrate '$volid' - storage type '$scfg->{type}' not supported\n"
if (!($scfg->{type} eq 'dir' || $scfg->{type} eq 'zfspool') && (!$sharedvm));
# if file, check if a backing file exist
if (!($scfg->{type} eq 'dir' || $scfg->{type} eq 'zfspool') && (!$sharedvm)) {
my (undef, undef, undef, $parent) = PVE::Storage::volume_size_info($self->{storecfg}, $volid, 1);
die "can't migrate '$volid' as it's a clone of '$parent'" if $parent;
}
}
foreach my $volid (keys %$volhash) {
my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
push @{$self->{volumes}}, $volid;
PVE::Storage::storage_migrate($self->{storecfg}, $volid, $self->{nodeip}, $sid);
}
};
die "Failed to sync data - $@" if $@;
}
sub phase1 {
my ($self, $vmid) = @_;
$self->log('info', "starting migration of VM $vmid to node '$self->{node}' ($self->{nodeip})");
my $conf = $self->{vmconf};
# set migrate lock in config file
$conf->{lock} = 'migrate';
PVE::QemuServer::update_config_nolock($vmid, $conf, 1);
sync_disks($self, $vmid);
};
sub phase1_cleanup {
my ($self, $vmid, $err) = @_;
$self->log('info', "aborting phase 1 - cleanup resources");
my $conf = $self->{vmconf};
delete $conf->{lock};
eval { PVE::QemuServer::update_config_nolock($vmid, $conf, 1) };
if (my $err = $@) {
$self->log('err', $err);
}
if ($self->{volumes}) {
foreach my $volid (@{$self->{volumes}}) {
$self->log('err', "found stale volume copy '$volid' on node '$self->{node}'");
# fixme: try to remove ?
}
}
}
sub phase2 {
my ($self, $vmid) = @_;
my $conf = $self->{vmconf};
$self->log('info', "starting VM $vmid on remote node '$self->{node}'");
my $raddr;
my $rport;
my $nodename = PVE::INotify::nodename();
## start on remote node
my $cmd = [@{$self->{rem_ssh}}];
my $spice_ticket;
if (PVE::QemuServer::vga_conf_has_spice($conf->{vga})) {
my $res = PVE::QemuServer::vm_mon_cmd($vmid, 'query-spice');
$spice_ticket = $res->{ticket};
}
push @$cmd , 'qm', 'start', $vmid, '--stateuri', 'tcp', '--skiplock', '--migratedfrom', $nodename;
if ($self->{forcemachine}) {
push @$cmd, '--machine', $self->{forcemachine};
}
my $spice_port;
# Note: We try to keep $spice_ticket secret (do not pass via command line parameter)
# instead we pipe it through STDIN
PVE::Tools::run_command($cmd, input => $spice_ticket, outfunc => sub {
my $line = shift;
if ($line =~ m/^migration listens on tcp:\[([\d\.:a-fA-F]+|localhost)\]:(\d+)$/) {
$raddr = $1;
$rport = int($2);
}
elsif ($line =~ m/^migration listens on port (\d+)$/) {
$raddr = "localhost";
$rport = int($1);
}
elsif ($line =~ m/^spice listens on port (\d+)$/) {
$spice_port = int($1);
}
}, errfunc => sub {
my $line = shift;
$self->log('info', $line);
});
die "unable to detect remote migration address\n" if !$raddr;
## create tunnel to remote port
$self->log('info', "starting ssh migration tunnel");
my $pfamily = PVE::Tools::get_host_address_family($nodename);
my $lport = ($raddr eq "localhost") ? PVE::Tools::next_migrate_port($pfamily) : undef;
$self->{tunnel} = $self->fork_tunnel($self->{nodeip}, $lport, $rport);
my $start = time();
$self->log('info', "starting online/live migration on $raddr:$rport");
$self->{livemigration} = 1;
# load_defaults
my $defaults = PVE::QemuServer::load_defaults();
# always set migrate speed (overwrite kvm default of 32m)
# we set a very hight default of 8192m which is basically unlimited
my $migrate_speed = $defaults->{migrate_speed} || 8192;
$migrate_speed = $conf->{migrate_speed} || $migrate_speed;
$migrate_speed = $migrate_speed * 1048576;
$self->log('info', "migrate_set_speed: $migrate_speed");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_speed", value => int($migrate_speed));
};
$self->log('info', "migrate_set_speed error: $@") if $@;
my $migrate_downtime = $defaults->{migrate_downtime};
$migrate_downtime = $conf->{migrate_downtime} if defined($conf->{migrate_downtime});
if (defined($migrate_downtime)) {
$self->log('info', "migrate_set_downtime: $migrate_downtime");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
};
$self->log('info', "migrate_set_downtime error: $@") if $@;
}
eval {
PVE::QemuServer::set_migration_caps($vmid);
};
warn $@ if $@;
#set cachesize 10% of the total memory
my $cachesize = int($conf->{memory}*1048576/10);
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-cache-size", value => $cachesize);
};
if (PVE::QemuServer::vga_conf_has_spice($conf->{vga})) {
my $rpcenv = PVE::RPCEnvironment::get();
my $authuser = $rpcenv->get_user();
my (undef, $proxyticket) = PVE::AccessControl::assemble_spice_ticket($authuser, $vmid, $self->{node});
my $filename = "/etc/pve/nodes/$self->{node}/pve-ssl.pem";
my $subject = PVE::AccessControl::read_x509_subject_spice($filename);
$self->log('info', "spice client_migrate_info");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "client_migrate_info", protocol => 'spice',
hostname => $proxyticket, 'tls-port' => $spice_port,
'cert-subject' => $subject);
};
$self->log('info', "client_migrate_info error: $@") if $@;
}
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate", uri => "tcp:[$raddr]:$rport");
};
my $merr = $@;
$self->log('info', "migrate uri => tcp:[$raddr]:$rport failed: $merr") if $merr;
my $lstat = 0;
my $usleep = 2000000;
my $i = 0;
my $err_count = 0;
my $lastrem = undef;
my $downtimecounter = 0;
while (1) {
$i++;
my $avglstat = $lstat/$i if $lstat;
usleep($usleep);
my $stat;
eval {
$stat = PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "query-migrate");
};
if (my $err = $@) {
$err_count++;
warn "query migrate failed: $err\n";
if ($err_count <= 5) {
usleep(1000000);
next;
}
die "too many query migrate failures - aborting\n";
}
if ($stat->{status} =~ m/^(setup)$/im) {
sleep(1);
next;
}
if ($stat->{status} =~ m/^(active|completed|failed|cancelled)$/im) {
$merr = undef;
$err_count = 0;
if ($stat->{status} eq 'completed') {
my $delay = time() - $start;
if ($delay > 0) {
my $mbps = sprintf "%.2f", $conf->{memory}/$delay;
my $downtime = $stat->{downtime} || 0;
$self->log('info', "migration speed: $mbps MB/s - downtime $downtime ms");
}
}
if ($stat->{status} eq 'failed' || $stat->{status} eq 'cancelled') {
die "aborting\n"
}
if ($stat->{status} ne 'active') {
$self->log('info', "migration status: $stat->{status}");
last;
}
if ($stat->{ram}->{transferred} ne $lstat) {
my $trans = $stat->{ram}->{transferred} || 0;
my $rem = $stat->{ram}->{remaining} || 0;
my $total = $stat->{ram}->{total} || 0;
my $xbzrlecachesize = $stat->{"xbzrle-cache"}->{"cache-size"} || 0;
my $xbzrlebytes = $stat->{"xbzrle-cache"}->{"bytes"} || 0;
my $xbzrlepages = $stat->{"xbzrle-cache"}->{"pages"} || 0;
my $xbzrlecachemiss = $stat->{"xbzrle-cache"}->{"cache-miss"} || 0;
my $xbzrleoverflow = $stat->{"xbzrle-cache"}->{"overflow"} || 0;
#reduce sleep if remainig memory if lower than the everage transfert
$usleep = 300000 if $avglstat && $rem < $avglstat;
$self->log('info', "migration status: $stat->{status} (transferred ${trans}, " .
"remaining ${rem}), total ${total})");
if (${xbzrlecachesize}) {
$self->log('info', "migration xbzrle cachesize: ${xbzrlecachesize} transferred ${xbzrlebytes} pages ${xbzrlepages} cachemiss ${xbzrlecachemiss} overflow ${xbzrleoverflow}");
}
if (($lastrem && $rem > $lastrem ) || ($rem == 0)) {
$downtimecounter++;
}
$lastrem = $rem;
if ($downtimecounter > 5) {
$downtimecounter = 0;
$migrate_downtime *= 2;
$self->log('info', "migrate_set_downtime: $migrate_downtime");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
};
$self->log('info', "migrate_set_downtime error: $@") if $@;
}
}
$lstat = $stat->{ram}->{transferred};
} else {
die $merr if $merr;
die "unable to parse migration status '$stat->{status}' - aborting\n";
}
}
}
sub phase2_cleanup {
my ($self, $vmid, $err) = @_;
return if !$self->{errors};
$self->{phase2errors} = 1;
$self->log('info', "aborting phase 2 - cleanup resources");
$self->log('info', "migrate_cancel");
eval {
PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_cancel");
};
$self->log('info', "migrate_cancel error: $@") if $@;
my $conf = $self->{vmconf};
delete $conf->{lock};
eval { PVE::QemuServer::update_config_nolock($vmid, $conf, 1) };
if (my $err = $@) {
$self->log('err', $err);
}
# cleanup ressources on target host
my $nodename = PVE::INotify::nodename();
my $cmd = [@{$self->{rem_ssh}}, 'qm', 'stop', $vmid, '--skiplock', '--migratedfrom', $nodename];
eval{ PVE::Tools::run_command($cmd, outfunc => sub {}, errfunc => sub {}) };
if (my $err = $@) {
$self->log('err', $err);
$self->{errors} = 1;
}
}
sub phase3 {
my ($self, $vmid) = @_;
my $volids = $self->{volumes};
return if $self->{phase2errors};
# destroy local copies
foreach my $volid (@$volids) {
eval { PVE::Storage::vdisk_free($self->{storecfg}, $volid); };
if (my $err = $@) {
$self->log('err', "removing local copy of '$volid' failed - $err");
$self->{errors} = 1;
last if $err =~ /^interrupted by signal$/;
}
}
}
sub phase3_cleanup {
my ($self, $vmid, $err) = @_;
my $conf = $self->{vmconf};
return if $self->{phase2errors};
# move config to remote node
my $conffile = PVE::QemuServer::config_file($vmid);
my $newconffile = PVE::QemuServer::config_file($vmid, $self->{node});
die "Failed to move config to node '$self->{node}' - rename failed: $!\n"
if !rename($conffile, $newconffile);
if ($self->{livemigration}) {
# now that config file is move, we can resume vm on target if livemigrate
my $cmd = [@{$self->{rem_ssh}}, 'qm', 'resume', $vmid, '--skiplock'];
eval{ PVE::Tools::run_command($cmd, outfunc => sub {},
errfunc => sub {
my $line = shift;
$self->log('err', $line);
});
};
if (my $err = $@) {
$self->log('err', $err);
$self->{errors} = 1;
}
}
eval {
my $timer = 0;
if (PVE::QemuServer::vga_conf_has_spice($conf->{vga}) && $self->{running}) {
$self->log('info', "Waiting for spice server migration");
while (1) {
my $res = PVE::QemuServer::vm_mon_cmd_nocheck($vmid, 'query-spice');
last if int($res->{'migrated'}) == 1;
last if $timer > 50;
$timer ++;
usleep(200000);
}
}
};
# always stop local VM
eval { PVE::QemuServer::vm_stop($self->{storecfg}, $vmid, 1, 1); };
if (my $err = $@) {
$self->log('err', "stopping vm failed - $err");
$self->{errors} = 1;
}
if ($self->{tunnel}) {
eval { finish_tunnel($self, $self->{tunnel}); };
if (my $err = $@) {
$self->log('err', $err);
$self->{errors} = 1;
}
}
# always deactivate volumes - avoid lvm LVs to be active on several nodes
eval {
my $vollist = PVE::QemuServer::get_vm_volumes($conf);
PVE::Storage::deactivate_volumes($self->{storecfg}, $vollist);
};
if (my $err = $@) {
$self->log('err', $err);
$self->{errors} = 1;
}
# clear migrate lock
my $cmd = [ @{$self->{rem_ssh}}, 'qm', 'unlock', $vmid ];
$self->cmd_logerr($cmd, errmsg => "failed to clear migrate lock");
}
sub final_cleanup {
my ($self, $vmid) = @_;
# nothing to do
}
1;