PVE/QemuMigrate.pm

   1 package PVE::QemuMigrate;
   2
   3 use strict;
   4 use warnings;
   5 use PVE::AbstractMigrate;
   6 use IO::File;
   7 use IPC::Open2;
   8 use POSIX qw( WNOHANG );
   9 use PVE::INotify;
  10 use PVE::Tools;
  11 use PVE::Cluster;
  12 use PVE::Storage;
  13 use PVE::QemuServer;
  14 use Time::HiRes qw( usleep );
  15 use PVE::RPCEnvironment;
  16
  17 use base qw(PVE::AbstractMigrate);
  18
  19 sub fork_command_pipe {
  20     my ($self, $cmd) = @_;
  21
  22     my $reader = IO::File->new();
  23     my $writer = IO::File->new();
  24
  25     my $orig_pid = $$;
  26
  27     my $cpid;
  28
  29     eval { $cpid = open2($reader, $writer, @$cmd); };
  30
  31     my $err = $@;
  32
  33     # catch exec errors
  34     if ($orig_pid != $$) {
  35         $self->log('err', "can't fork command pipe\n");
  36         POSIX::_exit(1);
  37         kill('KILL', $$);
  38     }
  39
  40     die $err if $err;
  41
  42     return { writer => $writer, reader => $reader, pid => $cpid };
  43 }
  44
  45 sub finish_command_pipe {
  46     my ($self, $cmdpipe, $timeout) = @_;
  47
  48     my $cpid = $cmdpipe->{pid};
  49     return if !defined($cpid);
  50
  51     my $writer = $cmdpipe->{writer};
  52     my $reader = $cmdpipe->{reader};
  53
  54     $writer->close();
  55     $reader->close();
  56
  57     my $collect_child_process = sub {
  58         my $res = waitpid($cpid, WNOHANG);
  59         if (defined($res) && ($res == $cpid)) {
  60             delete $cmdpipe->{cpid};
  61             return 1;
  62         } else {
  63             return 0;
  64         }
  65      };
  66
  67     if ($timeout) {
  68         for (my $i = 0; $i < $timeout; $i++) {
  69             return if &$collect_child_process();
  70             sleep(1);
  71         }
  72     }
  73
  74     $self->log('info', "ssh tunnel still running - terminating now with SIGTERM\n");
  75     kill(15, $cpid);
  76
  77     # wait again
  78     for (my $i = 0; $i < 10; $i++) {
  79         return if &$collect_child_process();
  80         sleep(1);
  81     }
  82
  83     $self->log('info', "ssh tunnel still running - terminating now with SIGKILL\n");
  84     kill 9, $cpid;
  85     sleep 1;
  86
  87     $self->log('err', "ssh tunnel child process (PID $cpid) couldn't be collected\n")
  88         if !&$collect_child_process();
  89 }
  90
  91 sub fork_tunnel {
  92     my ($self, $tunnel_addr) = @_;
  93
  94     my @localtunnelinfo = ('-L' , $tunnel_addr );
  95
  96     my $cmd = [@{$self->{rem_ssh}}, '-o ExitOnForwardFailure=yes', @localtunnelinfo, 'qm', 'mtunnel' ];
  97
  98     my $tunnel = $self->fork_command_pipe($cmd);
  99
 100     my $reader = $tunnel->{reader};
 101
 102     my $helo;
 103     eval {
 104         PVE::Tools::run_with_timeout(60, sub { $helo = <$reader>; });
 105         die "no reply\n" if !$helo;
 106         die "no quorum on target node\n" if $helo =~ m/^no quorum$/;
 107         die "got strange reply from mtunnel ('$helo')\n"
 108             if $helo !~ m/^tunnel online$/;
 109     };
 110     my $err = $@;
 111
 112     if ($err) {
 113         $self->finish_command_pipe($tunnel);
 114         die "can't open migration tunnel - $err";
 115     }
 116     return $tunnel;
 117 }
 118
 119 sub finish_tunnel {
 120     my ($self, $tunnel) = @_;
 121
 122     my $writer = $tunnel->{writer};
 123
 124     eval {
 125         PVE::Tools::run_with_timeout(30, sub {
 126             print $writer "quit\n";
 127             $writer->flush();
 128         });
 129     };
 130     my $err = $@;
 131
 132     $self->finish_command_pipe($tunnel, 30);
 133
 134     if ($tunnel->{sock_addr}) {
 135         # ssh does not clean up on local host
 136         my $cmd = ['rm', '-f', $tunnel->{sock_addr}]; #
 137         PVE::Tools::run_command($cmd);
 138
 139         # .. and just to be sure check on remote side
 140         unshift @{$cmd}, @{$self->{rem_ssh}};
 141         PVE::Tools::run_command($cmd);
 142     }
 143
 144     die $err if $err;
 145 }
 146
 147 sub lock_vm {
 148     my ($self, $vmid, $code, @param) = @_;
 149
 150     return PVE::QemuConfig->lock_config($vmid, $code, @param);
 151 }
 152
 153 sub prepare {
 154     my ($self, $vmid) = @_;
 155
 156     my $online = $self->{opts}->{online};
 157
 158     $self->{storecfg} = PVE::Storage::config();
 159
 160     # test if VM exists
 161     my $conf = $self->{vmconf} = PVE::QemuConfig->load_config($vmid);
 162
 163     PVE::QemuConfig->check_lock($conf);
 164
 165     my $running = 0;
 166     if (my $pid = PVE::QemuServer::check_running($vmid)) {
 167         die "cant migrate running VM without --online\n" if !$online;
 168         $running = $pid;
 169
 170         $self->{forcemachine} = PVE::QemuServer::qemu_machine_pxe($vmid, $conf);
 171
 172     }
 173
 174     if (my $loc_res = PVE::QemuServer::check_local_resources($conf, 1)) {
 175         if ($self->{running} || !$self->{opts}->{force}) {
 176             die "can't migrate VM which uses local devices\n";
 177         } else {
 178             $self->log('info', "migrating VM which uses local devices");
 179         }
 180     }
 181
 182     my $vollist = PVE::QemuServer::get_vm_volumes($conf);
 183
 184     my $need_activate = [];
 185     foreach my $volid (@$vollist) {
 186         my ($sid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
 187
 188         # check if storage is available on both nodes
 189         my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $sid);
 190         PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
 191
 192         if ($scfg->{shared}) {
 193             # PVE::Storage::activate_storage checks this for non-shared storages
 194             my $plugin = PVE::Storage::Plugin->lookup($scfg->{type});
 195             warn "Used shared storage '$sid' is not online on source node!\n"
 196                 if !$plugin->check_connection($sid, $scfg);
 197         } else {
 198             # only activate if not shared
 199             push @$need_activate, $volid;
 200         }
 201     }
 202
 203     # activate volumes
 204     PVE::Storage::activate_volumes($self->{storecfg}, $need_activate);
 205
 206     # test ssh connection
 207     my $cmd = [ @{$self->{rem_ssh}}, '/bin/true' ];
 208     eval { $self->cmd_quiet($cmd); };
 209     die "Can't connect to destination address using public key\n" if $@;
 210
 211     return $running;
 212 }
 213
 214 sub sync_disks {
 215     my ($self, $vmid) = @_;
 216
 217     $self->log('info', "copying disk images");
 218
 219     my $conf = $self->{vmconf};
 220
 221     $self->{volumes} = [];
 222
 223     my $res = [];
 224
 225     eval {
 226
 227         my $volhash = {};
 228         my $cdromhash = {};
 229
 230         my $sharedvm = 1;
 231
 232         my @sids = PVE::Storage::storage_ids($self->{storecfg});
 233         foreach my $storeid (@sids) {
 234             my $scfg = PVE::Storage::storage_config($self->{storecfg}, $storeid);
 235             next if $scfg->{shared};
 236             next if !PVE::Storage::storage_check_enabled($self->{storecfg}, $storeid, undef, 1);
 237
 238             # get list from PVE::Storage (for unused volumes)
 239             my $dl = PVE::Storage::vdisk_list($self->{storecfg}, $storeid, $vmid);
 240             PVE::Storage::foreach_volid($dl, sub {
 241                 my ($volid, $sid, $volname) = @_;
 242
 243                 # check if storage is available on target node
 244                 PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
 245
 246                 $volhash->{$volid} = 1;
 247                 $sharedvm = 0; # there is a non-shared disk
 248             });
 249         }
 250
 251         # and add used, owned/non-shared disks (just to be sure we have all)
 252
 253         PVE::QemuServer::foreach_volid($conf, sub {
 254             my ($volid, $is_cdrom) = @_;
 255
 256             return if !$volid;
 257
 258             die "can't migrate local file/device '$volid'\n" if $volid =~ m|^/|;
 259
 260             if ($is_cdrom) {
 261                 die "cant migrate local cdrom drive\n" if $volid eq 'cdrom';
 262                 return if $volid eq 'none';
 263                 $cdromhash->{$volid} = 1;
 264             }
 265
 266             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 267
 268             # check if storage is available on both nodes
 269             my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $sid);
 270             PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
 271
 272             return if $scfg->{shared};
 273
 274             die "can't migrate local cdrom '$volid'\n" if $cdromhash->{$volid};
 275
 276             $sharedvm = 0;
 277
 278             my ($path, $owner) = PVE::Storage::path($self->{storecfg}, $volid);
 279
 280             die "can't migrate volume '$volid' - owned by other VM (owner = VM $owner)\n"
 281                 if !$owner || ($owner != $self->{vmid});
 282
 283             $volhash->{$volid} = 1;
 284         });
 285
 286         if ($self->{running} && !$sharedvm) {
 287             die "can't do online migration - VM uses local disks\n";
 288         }
 289
 290         # do some checks first
 291         foreach my $volid (keys %$volhash) {
 292             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 293             my $scfg =  PVE::Storage::storage_config($self->{storecfg}, $sid);
 294
 295             die "can't migrate '$volid' - storage type '$scfg->{type}' not supported\n"
 296                 if (!($scfg->{type} eq 'dir' || $scfg->{type} eq 'zfspool') && (!$sharedvm));
 297
 298             # if file, check if a backing file exist
 299             if (!($scfg->{type} eq 'dir' || $scfg->{type} eq 'zfspool') && (!$sharedvm)) {
 300                 my (undef, undef, undef, $parent) = PVE::Storage::volume_size_info($self->{storecfg}, $volid, 1);
 301                 die "can't migrate '$volid' as it's a clone of '$parent'" if $parent;
 302             }
 303         }
 304
 305         foreach my $volid (keys %$volhash) {
 306             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 307             push @{$self->{volumes}}, $volid;
 308             PVE::Storage::storage_migrate($self->{storecfg}, $volid, $self->{nodeip}, $sid);
 309         }
 310     };
 311     die "Failed to sync data - $@" if $@;
 312 }
 313
 314 sub phase1 {
 315     my ($self, $vmid) = @_;
 316
 317     $self->log('info', "starting migration of VM $vmid to node '$self->{node}' ($self->{nodeip})");
 318
 319     my $conf = $self->{vmconf};
 320
 321     # set migrate lock in config file
 322     $conf->{lock} = 'migrate';
 323     PVE::QemuConfig->write_config($vmid, $conf);
 324
 325     sync_disks($self, $vmid);
 326
 327 };
 328
 329 sub phase1_cleanup {
 330     my ($self, $vmid, $err) = @_;
 331
 332     $self->log('info', "aborting phase 1 - cleanup resources");
 333
 334     my $conf = $self->{vmconf};
 335     delete $conf->{lock};
 336     eval { PVE::QemuConfig->write_config($vmid, $conf) };
 337     if (my $err = $@) {
 338         $self->log('err', $err);
 339     }
 340
 341     if ($self->{volumes}) {
 342         foreach my $volid (@{$self->{volumes}}) {
 343             $self->log('err', "found stale volume copy '$volid' on node '$self->{node}'");
 344             # fixme: try to remove ?
 345         }
 346     }
 347 }
 348
 349 sub phase2 {
 350     my ($self, $vmid) = @_;
 351
 352     my $conf = $self->{vmconf};
 353
 354     $self->log('info', "starting VM $vmid on remote node '$self->{node}'");
 355
 356     my $raddr;
 357     my $rport;
 358     my $ruri; # the whole migration dst. URI (protocol:address[:port])
 359     my $nodename = PVE::INotify::nodename();
 360
 361     ## start on remote node
 362     my $cmd = [@{$self->{rem_ssh}}];
 363
 364     my $spice_ticket;
 365     if (PVE::QemuServer::vga_conf_has_spice($conf->{vga})) {
 366         my $res = PVE::QemuServer::vm_mon_cmd($vmid, 'query-spice');
 367         $spice_ticket = $res->{ticket};
 368     }
 369
 370     push @$cmd , 'qm', 'start', $vmid, '--skiplock', '--migratedfrom', $nodename;
 371
 372     # we use TCP only for unsecure migrations as TCP ssh forward tunnels often
 373     # did appeared to late (they are hard, if not impossible, to check for)
 374     # secure migration use UNIX sockets now, this *breaks* compatibilty when trying
 375     # to migrate from new to old but *not* from old to new.
 376     my $datacenterconf = PVE::Cluster::cfs_read_file('datacenter.cfg');
 377     my $secure_migration = ($datacenterconf->{migration_unsecure}) ? 0 : 1;
 378
 379     if (!$secure_migration) {
 380         push @$cmd, '--stateuri', 'tcp';
 381     } else {
 382         push @$cmd, '--stateuri', 'unix';
 383     }
 384
 385     if ($self->{forcemachine}) {
 386         push @$cmd, '--machine', $self->{forcemachine};
 387     }
 388
 389     my $spice_port;
 390
 391     # Note: We try to keep $spice_ticket secret (do not pass via command line parameter)
 392     # instead we pipe it through STDIN
 393     PVE::Tools::run_command($cmd, input => $spice_ticket, outfunc => sub {
 394         my $line = shift;
 395
 396         if ($line =~ m/^migration listens on tcp:(localhost|[\d\.]+|\[[\d\.:a-fA-F]+\]):(\d+)$/) {
 397             $raddr = $1;
 398             $rport = int($2);
 399             $ruri = "tcp:$raddr:$rport";
 400         }
 401         elsif ($line =~ m!^migration listens on unix:(/run/qemu-server/(\d+)\.migrate)$!) {
 402             $raddr = $1;
 403             die "Destination UNIX sockets VMID does not match source VMID" if $vmid ne $2;
 404             $ruri = "unix:$raddr";
 405         }
 406         elsif ($line =~ m/^migration listens on port (\d+)$/) {
 407             $raddr = "localhost";
 408             $rport = int($1);
 409             $ruri = "tcp:$raddr:$rport";
 410         }
 411         elsif ($line =~ m/^spice listens on port (\d+)$/) {
 412             $spice_port = int($1);
 413         }
 414     }, errfunc => sub {
 415         my $line = shift;
 416         $self->log('info', $line);
 417     });
 418
 419     die "unable to detect remote migration address\n" if !$raddr;
 420
 421     if ($secure_migration) {
 422         $self->log('info', "start remote tunnel");
 423
 424         if ($ruri =~ /^unix:/) {
 425             $self->{tunnel} = $self->fork_tunnel("$raddr:$raddr");
 426             $self->{tunnel}->{sock_addr} = $raddr;
 427
 428             my $unix_socket_try = 0; # wait for the socket to become ready
 429             while (! -S $raddr) {
 430                 $unix_socket_try++;
 431                 if ($unix_socket_try > 100) {
 432                     $self->{errors} = 1;
 433                     $self->finish_tunnel($self->{tunnel});
 434                     die "Timeout, migration socket $ruri did not get ready";
 435                 }
 436
 437                 usleep(50000);
 438             }
 439
 440         } elsif ($ruri =~ /^tcp:/) {
 441             # for backwards compatibility with older qemu-server versions
 442             my $pfamily = PVE::Tools::get_host_address_family($nodename);
 443             my $lport = PVE::Tools::next_migrate_port($pfamily);
 444
 445             $self->{tunnel} = $self->fork_tunnel("$lport:localhost:$rport");
 446
 447         } else {
 448             die "unsupported protocol in migration URI: $ruri\n";
 449         }
 450     }
 451
 452     my $start = time();
 453     $self->log('info', "starting online/live migration on $ruri");
 454     $self->{livemigration} = 1;
 455
 456     # load_defaults
 457     my $defaults = PVE::QemuServer::load_defaults();
 458
 459     # always set migrate speed (overwrite kvm default of 32m)
 460     # we set a very hight default of 8192m which is basically unlimited
 461     my $migrate_speed = $defaults->{migrate_speed} || 8192;
 462     $migrate_speed = $conf->{migrate_speed} || $migrate_speed;
 463     $migrate_speed = $migrate_speed * 1048576;
 464     $self->log('info', "migrate_set_speed: $migrate_speed");
 465     eval {
 466         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_speed", value => int($migrate_speed));
 467     };
 468     $self->log('info', "migrate_set_speed error: $@") if $@;
 469
 470     my $migrate_downtime = $defaults->{migrate_downtime};
 471     $migrate_downtime = $conf->{migrate_downtime} if defined($conf->{migrate_downtime});
 472     if (defined($migrate_downtime)) {
 473         $self->log('info', "migrate_set_downtime: $migrate_downtime");
 474         eval {
 475             PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
 476         };
 477         $self->log('info', "migrate_set_downtime error: $@") if $@;
 478     }
 479
 480     eval {
 481         PVE::QemuServer::set_migration_caps($vmid);
 482     };
 483     warn $@ if $@;
 484
 485     #set cachesize 10% of the total memory
 486     my $cachesize = int($conf->{memory}*1048576/10);
 487     eval {
 488         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate-set-cache-size", value => $cachesize);
 489     };
 490
 491     if (PVE::QemuServer::vga_conf_has_spice($conf->{vga})) {
 492         my $rpcenv = PVE::RPCEnvironment::get();
 493         my $authuser = $rpcenv->get_user();
 494
 495         my (undef, $proxyticket) = PVE::AccessControl::assemble_spice_ticket($authuser, $vmid, $self->{node});
 496
 497         my $filename = "/etc/pve/nodes/$self->{node}/pve-ssl.pem";
 498         my $subject =  PVE::AccessControl::read_x509_subject_spice($filename);
 499
 500         $self->log('info', "spice client_migrate_info");
 501
 502         eval {
 503             PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "client_migrate_info", protocol => 'spice',
 504                                                 hostname => $proxyticket, 'tls-port' => $spice_port,
 505                                                 'cert-subject' => $subject);
 506         };
 507         $self->log('info', "client_migrate_info error: $@") if $@;
 508
 509     }
 510
 511     eval {
 512         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate", uri => $ruri);
 513     };
 514     my $merr = $@;
 515     $self->log('info', "migrate uri => $ruri failed: $merr") if $merr;
 516
 517     my $lstat = 0;
 518     my $usleep = 2000000;
 519     my $i = 0;
 520     my $err_count = 0;
 521     my $lastrem = undef;
 522     my $downtimecounter = 0;
 523     while (1) {
 524         $i++;
 525         my $avglstat = $lstat/$i if $lstat;
 526
 527         usleep($usleep);
 528         my $stat;
 529         eval {
 530             $stat = PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "query-migrate");
 531         };
 532         if (my $err = $@) {
 533             $err_count++;
 534             warn "query migrate failed: $err\n";
 535             if ($err_count <= 5) {
 536                 usleep(1000000);
 537                 next;
 538             }
 539             die "too many query migrate failures - aborting\n";
 540         }
 541
 542         if ($stat->{status} =~ m/^(setup)$/im) {
 543             sleep(1);
 544             next;
 545         }
 546
 547         if ($stat->{status} =~ m/^(active|completed|failed|cancelled)$/im) {
 548             $merr = undef;
 549             $err_count = 0;
 550             if ($stat->{status} eq 'completed') {
 551                 my $delay = time() - $start;
 552                 if ($delay > 0) {
 553                     my $mbps = sprintf "%.2f", $conf->{memory}/$delay;
 554                     my $downtime = $stat->{downtime} || 0;
 555                     $self->log('info', "migration speed: $mbps MB/s - downtime $downtime ms");
 556                 }
 557             }
 558
 559             if ($stat->{status} eq 'failed' || $stat->{status} eq 'cancelled') {
 560                 die "aborting\n"
 561             }
 562
 563             if ($stat->{status} ne 'active') {
 564                 $self->log('info', "migration status: $stat->{status}");
 565                 last;
 566             }
 567
 568             if ($stat->{ram}->{transferred} ne $lstat) {
 569                 my $trans = $stat->{ram}->{transferred} || 0;
 570                 my $rem = $stat->{ram}->{remaining} || 0;
 571                 my $total = $stat->{ram}->{total} || 0;
 572                 my $xbzrlecachesize = $stat->{"xbzrle-cache"}->{"cache-size"} || 0;
 573                 my $xbzrlebytes = $stat->{"xbzrle-cache"}->{"bytes"} || 0;
 574                 my $xbzrlepages = $stat->{"xbzrle-cache"}->{"pages"} || 0;
 575                 my $xbzrlecachemiss = $stat->{"xbzrle-cache"}->{"cache-miss"} || 0;
 576                 my $xbzrleoverflow = $stat->{"xbzrle-cache"}->{"overflow"} || 0;
 577                 #reduce sleep if remainig memory if lower than the everage transfert
 578                 $usleep = 300000 if $avglstat && $rem < $avglstat;
 579
 580                 $self->log('info', "migration status: $stat->{status} (transferred ${trans}, " .
 581                            "remaining ${rem}), total ${total})");
 582
 583                 if (${xbzrlecachesize}) {
 584                     $self->log('info', "migration xbzrle cachesize: ${xbzrlecachesize} transferred ${xbzrlebytes} pages ${xbzrlepages} cachemiss ${xbzrlecachemiss} overflow ${xbzrleoverflow}");
 585                 }
 586
 587                 if (($lastrem  && $rem > $lastrem ) || ($rem == 0)) {
 588                     $downtimecounter++;
 589                 }
 590                 $lastrem = $rem;
 591
 592                 if ($downtimecounter > 5) {
 593                     $downtimecounter = 0;
 594                     $migrate_downtime *= 2;
 595                     $self->log('info', "migrate_set_downtime: $migrate_downtime");
 596                     eval {
 597                         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_set_downtime", value => int($migrate_downtime*100)/100);
 598                     };
 599                     $self->log('info', "migrate_set_downtime error: $@") if $@;
 600                 }
 601
 602             }
 603
 604
 605             $lstat = $stat->{ram}->{transferred};
 606
 607         } else {
 608             die $merr if $merr;
 609             die "unable to parse migration status '$stat->{status}' - aborting\n";
 610         }
 611     }
 612     #to be sure tat the tunnel is closed
 613     if ($self->{tunnel}) {
 614         eval { finish_tunnel($self, $self->{tunnel});  };
 615         if (my $err = $@) {
 616             $self->log('err', $err);
 617             $self->{errors} = 1;
 618         }
 619     }
 620 }
 621
 622 sub phase2_cleanup {
 623     my ($self, $vmid, $err) = @_;
 624
 625     return if !$self->{errors};
 626     $self->{phase2errors} = 1;
 627
 628     $self->log('info', "aborting phase 2 - cleanup resources");
 629
 630     $self->log('info', "migrate_cancel");
 631     eval {
 632         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate_cancel");
 633     };
 634     $self->log('info', "migrate_cancel error: $@") if $@;
 635
 636     my $conf = $self->{vmconf};
 637     delete $conf->{lock};
 638     eval { PVE::QemuConfig->write_config($vmid, $conf) };
 639     if (my $err = $@) {
 640         $self->log('err', $err);
 641     }
 642
 643     # cleanup ressources on target host
 644     my $nodename = PVE::INotify::nodename();
 645
 646     my $cmd = [@{$self->{rem_ssh}}, 'qm', 'stop', $vmid, '--skiplock', '--migratedfrom', $nodename];
 647     eval{ PVE::Tools::run_command($cmd, outfunc => sub {}, errfunc => sub {}) };
 648     if (my $err = $@) {
 649         $self->log('err', $err);
 650         $self->{errors} = 1;
 651     }
 652
 653     if ($self->{tunnel}) {
 654         eval { finish_tunnel($self, $self->{tunnel});  };
 655         if (my $err = $@) {
 656             $self->log('err', $err);
 657             $self->{errors} = 1;
 658         }
 659     }
 660 }
 661
 662 sub phase3 {
 663     my ($self, $vmid) = @_;
 664
 665     my $volids = $self->{volumes};
 666     return if $self->{phase2errors};
 667
 668     # destroy local copies
 669     foreach my $volid (@$volids) {
 670         eval { PVE::Storage::vdisk_free($self->{storecfg}, $volid); };
 671         if (my $err = $@) {
 672             $self->log('err', "removing local copy of '$volid' failed - $err");
 673             $self->{errors} = 1;
 674             last if $err =~ /^interrupted by signal$/;
 675         }
 676     }
 677 }
 678
 679 sub phase3_cleanup {
 680     my ($self, $vmid, $err) = @_;
 681
 682     my $conf = $self->{vmconf};
 683     return if $self->{phase2errors};
 684
 685     # move config to remote node
 686     my $conffile = PVE::QemuConfig->config_file($vmid);
 687     my $newconffile = PVE::QemuConfig->config_file($vmid, $self->{node});
 688
 689     die "Failed to move config to node '$self->{node}' - rename failed: $!\n"
 690         if !rename($conffile, $newconffile);
 691
 692     if ($self->{livemigration}) {
 693         # now that config file is move, we can resume vm on target if livemigrate
 694         my $cmd = [@{$self->{rem_ssh}}, 'qm', 'resume', $vmid, '--skiplock', '--nocheck'];
 695         eval{ PVE::Tools::run_command($cmd, outfunc => sub {},
 696                 errfunc => sub {
 697                     my $line = shift;
 698                     $self->log('err', $line);
 699                 });
 700         };
 701         if (my $err = $@) {
 702             $self->log('err', $err);
 703             $self->{errors} = 1;
 704         }
 705     }
 706
 707     eval {
 708
 709         my $timer = 0;
 710         if (PVE::QemuServer::vga_conf_has_spice($conf->{vga}) && $self->{running}) {
 711             $self->log('info', "Waiting for spice server migration");
 712             while (1) {
 713                 my $res = PVE::QemuServer::vm_mon_cmd_nocheck($vmid, 'query-spice');
 714                 last if int($res->{'migrated'}) == 1;
 715                 last if $timer > 50;
 716                 $timer ++;
 717                 usleep(200000);
 718             }
 719         }
 720     };
 721
 722     # always stop local VM
 723     eval { PVE::QemuServer::vm_stop($self->{storecfg}, $vmid, 1, 1); };
 724     if (my $err = $@) {
 725         $self->log('err', "stopping vm failed - $err");
 726         $self->{errors} = 1;
 727     }
 728
 729     # always deactivate volumes - avoid lvm LVs to be active on several nodes
 730     eval {
 731         my $vollist = PVE::QemuServer::get_vm_volumes($conf);
 732         PVE::Storage::deactivate_volumes($self->{storecfg}, $vollist);
 733     };
 734     if (my $err = $@) {
 735         $self->log('err', $err);
 736         $self->{errors} = 1;
 737     }
 738
 739     # clear migrate lock
 740     my $cmd = [ @{$self->{rem_ssh}}, 'qm', 'unlock', $vmid ];
 741     $self->cmd_logerr($cmd, errmsg => "failed to clear migrate lock");
 742 }
 743
 744 sub final_cleanup {
 745     my ($self, $vmid) = @_;
 746
 747     # nothing to do
 748 }
 749
 750 1;