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 PVE::INotify;
   9 use PVE::Cluster;
  10 use PVE::Storage;
  11 use PVE::QemuServer;
  12 use Time::HiRes qw( usleep );
  13
  14 use base qw(PVE::AbstractMigrate);
  15
  16 sub fork_command_pipe {
  17     my ($self, $cmd) = @_;
  18
  19     my $reader = IO::File->new();
  20     my $writer = IO::File->new();
  21
  22     my $orig_pid = $$;
  23
  24     my $cpid;
  25
  26     eval { $cpid = open2($reader, $writer, @$cmd); };
  27
  28     my $err = $@;
  29
  30     # catch exec errors
  31     if ($orig_pid != $$) {
  32         $self->log('err', "can't fork command pipe\n");
  33         POSIX::_exit(1);
  34         kill('KILL', $$);
  35     }
  36
  37     die $err if $err;
  38
  39     return { writer => $writer, reader => $reader, pid => $cpid };
  40 }
  41
  42 sub finish_command_pipe {
  43     my ($self, $cmdpipe, $timeout) = @_;
  44
  45     my $writer = $cmdpipe->{writer};
  46     my $reader = $cmdpipe->{reader};
  47
  48     $writer->close();
  49     $reader->close();
  50
  51     my $cpid = $cmdpipe->{pid};
  52
  53     if ($timeout) {
  54         for (my $i = 0; $i < $timeout; $i++) {
  55             return if !PVE::ProcFSTools::check_process_running($cpid);
  56             sleep(1);
  57         }
  58     }
  59
  60     $self->log('info', "ssh tunnel still running - terminating now with SIGTERM\n");
  61     kill(15, $cpid);
  62
  63     # wait again
  64     for (my $i = 0; $i < 10; $i++) {
  65         return if !PVE::ProcFSTools::check_process_running($cpid);
  66         sleep(1);
  67     }
  68
  69     $self->log('info', "ssh tunnel still running - terminating now with SIGKILL\n");
  70     kill 9, $cpid;
  71     sleep 1;
  72 }
  73
  74 sub fork_tunnel {
  75     my ($self, $nodeip, $lport, $rport) = @_;
  76
  77     my $cmd = [@{$self->{rem_ssh}}, '-L', "$lport:localhost:$rport",
  78                'qm', 'mtunnel' ];
  79
  80     my $tunnel = $self->fork_command_pipe($cmd);
  81
  82     my $reader = $tunnel->{reader};
  83
  84     my $helo;
  85     eval {
  86         PVE::Tools::run_with_timeout(60, sub { $helo = <$reader>; });
  87         die "no reply\n" if !$helo;
  88         die "no quorum on target node\n" if $helo =~ m/^no quorum$/;
  89         die "got strange reply from mtunnel ('$helo')\n"
  90             if $helo !~ m/^tunnel online$/;
  91     };
  92     my $err = $@;
  93
  94     if ($err) {
  95         $self->finish_command_pipe($tunnel);
  96         die "can't open migration tunnel - $err";
  97     }
  98     return $tunnel;
  99 }
 100
 101 sub finish_tunnel {
 102     my ($self, $tunnel) = @_;
 103
 104     my $writer = $tunnel->{writer};
 105
 106     eval {
 107         PVE::Tools::run_with_timeout(30, sub {
 108             print $writer "quit\n";
 109             $writer->flush();
 110         });
 111     };
 112     my $err = $@;
 113
 114     $self->finish_command_pipe($tunnel, 30);
 115
 116     die $err if $err;
 117 }
 118
 119 sub lock_vm {
 120     my ($self, $vmid, $code, @param) = @_;
 121
 122     return PVE::QemuServer::lock_config($vmid, $code, @param);
 123 }
 124
 125 sub prepare {
 126     my ($self, $vmid) = @_;
 127
 128     my $online = $self->{opts}->{online};
 129
 130     $self->{storecfg} = PVE::Storage::config();
 131
 132     # test is VM exist
 133     my $conf = $self->{vmconf} = PVE::QemuServer::load_config($vmid);
 134
 135     PVE::QemuServer::check_lock($conf);
 136
 137     my $running = 0;
 138     if (my $pid = PVE::QemuServer::check_running($vmid)) {
 139         die "cant migrate running VM without --online\n" if !$online;
 140         $running = $pid;
 141     }
 142
 143     if (my $loc_res = PVE::QemuServer::check_local_resources($conf, 1)) {
 144         if ($self->{running} || !$self->{opts}->{force}) {
 145             die "can't migrate VM which uses local devices\n";
 146         } else {
 147             $self->log('info', "migrating VM which uses local devices");
 148         }
 149     }
 150
 151     # activate volumes
 152     my $vollist = PVE::QemuServer::get_vm_volumes($conf);
 153     PVE::Storage::activate_volumes($self->{storecfg}, $vollist);
 154
 155     # fixme: check if storage is available on both nodes
 156
 157     # test ssh connection
 158     my $cmd = [ @{$self->{rem_ssh}}, '/bin/true' ];
 159     eval { $self->cmd_quiet($cmd); };
 160     die "Can't connect to destination address using public key\n" if $@;
 161
 162     return $running;
 163 }
 164
 165 sub sync_disks {
 166     my ($self, $vmid) = @_;
 167
 168     $self->log('info', "copying disk images");
 169
 170     my $conf = $self->{vmconf};
 171
 172     $self->{volumes} = [];
 173
 174     my $res = [];
 175
 176     eval {
 177
 178         my $volhash = {};
 179         my $cdromhash = {};
 180
 181         my @sids = PVE::Storage::storage_ids($self->{storecfg});
 182         foreach my $storeid (@sids) {
 183             my $scfg = PVE::Storage::storage_config($self->{storecfg}, $storeid);
 184             next if $scfg->{shared};
 185             next if !PVE::Storage::storage_check_enabled($self->{storecfg}, $storeid, undef, 1);
 186
 187             # get list from PVE::Storage (for unused volumes)
 188             my $dl = PVE::Storage::vdisk_list($self->{storecfg}, $storeid, $vmid);
 189             PVE::Storage::foreach_volid($dl, sub {
 190                 my ($volid, $sid, $volname) = @_;
 191
 192                 # check if storage is available on target node
 193                 PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
 194
 195                 $volhash->{$volid} = 1;
 196             });
 197         }
 198
 199         # and add used,owned/non-shared disks (just to be sure we have all)
 200
 201         my $sharedvm = 1;
 202         PVE::QemuServer::foreach_drive($conf, sub {
 203             my ($ds, $drive) = @_;
 204
 205             my $volid = $drive->{file};
 206             return if !$volid;
 207
 208             die "cant migrate local file/device '$volid'\n" if $volid =~ m|^/|;
 209
 210             if (PVE::QemuServer::drive_is_cdrom($drive)) {
 211                 die "cant migrate local cdrom drive\n" if $volid eq 'cdrom';
 212                 return if $volid eq 'none';
 213                 $cdromhash->{$volid} = 1;
 214             }
 215
 216             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 217
 218             # check if storage is available on both nodes
 219             my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $sid);
 220             PVE::Storage::storage_check_node($self->{storecfg}, $sid, $self->{node});
 221
 222             return if $scfg->{shared};
 223
 224             die "can't migrate local cdrom '$volid'\n" if $cdromhash->{$volid};
 225
 226             $sharedvm = 0;
 227
 228             my ($path, $owner) = PVE::Storage::path($self->{storecfg}, $volid);
 229
 230             die "can't migrate volume '$volid' - owned by other VM (owner = VM $owner)\n"
 231                 if !$owner || ($owner != $self->{vmid});
 232
 233             $volhash->{$volid} = 1;
 234         });
 235
 236         if ($self->{running} && !$sharedvm) {
 237             die "can't do online migration - VM uses local disks\n";
 238         }
 239
 240         # do some checks first
 241         foreach my $volid (keys %$volhash) {
 242             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 243             my $scfg =  PVE::Storage::storage_config($self->{storecfg}, $sid);
 244
 245             die "can't migrate '$volid' - storagy type '$scfg->{type}' not supported\n"
 246                 if $scfg->{type} ne 'dir';
 247         }
 248
 249         foreach my $volid (keys %$volhash) {
 250             my ($sid, $volname) = PVE::Storage::parse_volume_id($volid);
 251             push @{$self->{volumes}}, $volid;
 252             PVE::Storage::storage_migrate($self->{storecfg}, $volid, $self->{nodeip}, $sid);
 253         }
 254     };
 255     die "Failed to sync data - $@" if $@;
 256 }
 257
 258 sub phase1 {
 259     my ($self, $vmid) = @_;
 260
 261     $self->log('info', "starting migration of VM $vmid to node '$self->{node}' ($self->{nodeip})");
 262
 263     my $conf = $self->{vmconf};
 264
 265     # set migrate lock in config file
 266     $conf->{lock} = 'migrate';
 267     PVE::QemuServer::update_config_nolock($vmid, $conf, 1);
 268
 269     sync_disks($self, $vmid);
 270
 271 };
 272
 273 sub phase1_cleanup {
 274     my ($self, $vmid, $err) = @_;
 275
 276     $self->log('info', "aborting phase 1 - cleanup resources");
 277
 278     my $conf = $self->{vmconf};
 279     delete $conf->{lock};
 280     eval { PVE::QemuServer::update_config_nolock($vmid, $conf, 1) };
 281     if (my $err = $@) {
 282         $self->log('err', $err);
 283     }
 284
 285     if ($self->{volumes}) {
 286         foreach my $volid (@{$self->{volumes}}) {
 287             $self->log('err', "found stale volume copy '$volid' on node '$self->{node}'");
 288             # fixme: try to remove ?
 289         }
 290     }
 291 }
 292
 293 sub phase2 {
 294     my ($self, $vmid) = @_;
 295
 296     my $conf = $self->{vmconf};
 297
 298     $self->log('info', "starting VM $vmid on remote node '$self->{node}'");
 299
 300     my $rport;
 301
 302     my $nodename = PVE::INotify::nodename();
 303
 304     ## start on remote node
 305     my $cmd = [@{$self->{rem_ssh}}, 'qm', 'start',
 306                $vmid, '--stateuri', 'tcp', '--skiplock', '--migratedfrom', $nodename];
 307
 308     PVE::Tools::run_command($cmd, outfunc => sub {
 309         my $line = shift;
 310
 311         if ($line =~ m/^migration listens on port (\d+)$/) {
 312             $rport = $1;
 313         }
 314     }, errfunc => sub {});
 315
 316     die "unable to detect remote migration port\n" if !$rport;
 317
 318     $self->log('info', "starting migration tunnel");
 319
 320     ## create tunnel to remote port
 321     my $lport = PVE::QemuServer::next_migrate_port();
 322     $self->{tunnel} = $self->fork_tunnel($self->{nodeip}, $lport, $rport);
 323
 324     $self->log('info', "starting online/live migration on port $lport");
 325     # start migration
 326
 327     my $start = time();
 328     eval {
 329         PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "migrate", uri => "tcp:localhost:$lport");
 330     };
 331     my $merr = $@;
 332
 333     my $lstat = 0;
 334     my $usleep = 2000000;
 335     my $i = 0;
 336     while (1) {
 337         $i++;
 338         my $avglstat = $lstat/$i if $lstat;
 339
 340         usleep ($usleep);
 341         my $stat = PVE::QemuServer::vm_mon_cmd_nocheck($vmid, "query-migrate");
 342         if ($stat->{status} =~ m/^(active|completed|failed|cancelled)$/im) {
 343             $merr = undef;
 344
 345             if ($stat->{status} eq 'completed') {
 346                 my $delay = time() - $start;
 347                 if ($delay > 0) {
 348                     my $mbps = sprintf "%.2f", $conf->{memory}/$delay;
 349                     $self->log('info', "migration speed: $mbps MB/s");
 350                 }
 351             }
 352
 353             if ($stat->{status} eq 'failed' || $stat->{status} eq 'cancelled') {
 354                 die "aborting\n"
 355             }
 356
 357             if ($stat->{status} ne 'active') {
 358                 $self->log('info', "migration status: $stat->{status}");
 359                 last;
 360             }
 361
 362             if ($stat->{ram}->{transferred} ne $lstat) {
 363                 my $trans = $stat->{ram}->{transferred} || 0;
 364                 my $rem = $stat->{ram}->{remaining} || 0;
 365                 my $total = $stat->{ram}->{total} || 0;
 366                 #reduce sleep if remainig memory if lower than the everage transfert
 367                 $usleep = 300000 if $rem < $avglstat;
 368
 369                 $self->log('info', "migration status: $stat->{status} (transferred ${trans}, " .
 370                            "remaining ${rem}), total ${total})");
 371             }
 372
 373             $lstat = $stat->{ram}->{transferred};
 374
 375         } else {
 376             die $merr if $merr;
 377             die "unable to parse migration status '$stat->{status}' - aborting\n";
 378         }
 379     }
 380 }
 381
 382 sub phase2_cleanup {
 383     my ($self, $vmid, $err) = @_;
 384
 385     $self->log('info', "aborting phase 2 - cleanup resources");
 386
 387     my $conf = $self->{vmconf};
 388     delete $conf->{lock};
 389     eval { PVE::QemuServer::update_config_nolock($vmid, $conf, 1) };
 390     if (my $err = $@) {
 391         $self->log('err', $err);
 392     }
 393
 394     ## fixme : vm_stop_cleanup on target vm
 395
 396
 397 }
 398
 399 sub phase3 {
 400     my ($self, $vmid) = @_;
 401
 402     my $volids = $self->{volumes};
 403
 404     # destroy local copies
 405     foreach my $volid (@$volids) {
 406         eval { PVE::Storage::vdisk_free($self->{storecfg}, $volid); };
 407         if (my $err = $@) {
 408             $self->log('err', "removing local copy of '$volid' failed - $err");
 409             $self->{errors} = 1;
 410             last if $err =~ /^interrupted by signal$/;
 411         }
 412     }
 413 }
 414
 415 sub phase3_cleanup {
 416     my ($self, $vmid, $err) = @_;
 417
 418     my $conf = $self->{vmconf};
 419
 420     # move config to remote node
 421     my $conffile = PVE::QemuServer::config_file($vmid);
 422     my $newconffile = PVE::QemuServer::config_file($vmid, $self->{node});
 423
 424     die "Failed to move config to node '$self->{node}' - rename failed: $!\n"
 425         if !rename($conffile, $newconffile);
 426
 427     # now that config file is move, we can resume vm on target if livemigrate
 428     if ($self->{tunnel}) {
 429         my $cmd = [@{$self->{rem_ssh}}, 'qm', 'resume', $vmid, '--skiplock'];
 430         eval{ PVE::Tools::run_command($cmd, outfunc => sub {}, errfunc => sub {}) };
 431         if (my $err = $@) {
 432             $self->log('err', $err);
 433             $self->{errors} = 1;
 434         }
 435     }
 436
 437     # always stop local VM
 438     eval { PVE::QemuServer::vm_stop($self->{storecfg}, $vmid, 1, 1); };
 439     if (my $err = $@) {
 440         $self->log('err', "stopping vm failed - $err");
 441         $self->{errors} = 1;
 442     }
 443
 444     if ($self->{tunnel}) {
 445         eval { finish_tunnel($self, $self->{tunnel});  };
 446         if (my $err = $@) {
 447             $self->log('err', $err);
 448             $self->{errors} = 1;
 449         }
 450     }
 451
 452     # always deactivate volumes - avoid lvm LVs to be active on several nodes
 453     eval {
 454         my $vollist = PVE::QemuServer::get_vm_volumes($conf);
 455         PVE::Storage::deactivate_volumes($self->{storecfg}, $vollist);
 456     };
 457     if (my $err = $@) {
 458         $self->log('err', $err);
 459         $self->{errors} = 1;
 460     }
 461
 462     # clear migrate lock
 463     my $cmd = [ @{$self->{rem_ssh}}, 'qm', 'unlock', $vmid ];
 464     $self->cmd_logerr($cmd, errmsg => "failed to clear migrate lock");
 465 }
 466
 467 sub final_cleanup {
 468     my ($self, $vmid) = @_;
 469
 470     # nothing to do
 471 }
 472
 473 1;