src/PVE/LXC/Migrate.pm

   1 package PVE::LXC::Migrate;
   2
   3 use strict;
   4 use warnings;
   5 use PVE::AbstractMigrate;
   6 use File::Basename;
   7 use File::Copy; # fixme: remove
   8 use PVE::Tools;
   9 use PVE::INotify;
  10 use PVE::Cluster;
  11 use PVE::Storage;
  12 use PVE::LXC;
  13
  14 use base qw(PVE::AbstractMigrate);
  15
  16 sub lock_vm {
  17     my ($self, $vmid, $code, @param) = @_;
  18
  19     return PVE::LXC::Config->lock_config($vmid, $code, @param);
  20 }
  21
  22 sub prepare {
  23     my ($self, $vmid) = @_;
  24
  25     my $online = $self->{opts}->{online};
  26
  27     $self->{storecfg} = PVE::Storage::config();
  28
  29     # test is VM exist
  30     my $conf = $self->{vmconf} = PVE::LXC::Config->load_config($vmid);
  31
  32     PVE::LXC::Config->check_lock($conf);
  33
  34     my $running = 0;
  35     if (PVE::LXC::check_running($vmid)) {
  36         die "lxc live migration is currently not implemented\n";
  37
  38         die "can't migrate running container without --online\n" if !$online;
  39         $running = 1;
  40     }
  41
  42     my $force = $self->{opts}->{force} // 0;
  43
  44     PVE::LXC::Config->foreach_mountpoint($conf, sub {
  45         my ($ms, $mountpoint) = @_;
  46
  47         my $volid = $mountpoint->{volume};
  48
  49         # skip dev/bind mps when forced
  50         if ($mountpoint->{type} ne 'volume' && $force) {
  51             return;
  52         }
  53         my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1) if $volid;
  54         die "can't determine assigned storage for mountpoint '$ms'\n" if !$storage;
  55
  56         # check if storage is available on both nodes
  57         my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $storage);
  58         PVE::Storage::storage_check_node($self->{storecfg}, $storage, $self->{node});
  59
  60         die "unable to migrate local mountpoint '$volid' while CT is running"
  61             if !$scfg->{shared} && $running;
  62
  63     });
  64
  65     my $volid_list = PVE::LXC::Config->get_vm_volumes($conf);
  66     PVE::Storage::activate_volumes($self->{storecfg}, $volid_list);
  67
  68     # todo: test if VM uses local resources
  69
  70     # test ssh connection
  71     my $cmd = [ @{$self->{rem_ssh}}, '/bin/true' ];
  72     eval { $self->cmd_quiet($cmd); };
  73     die "Can't connect to destination address using public key\n" if $@;
  74
  75     return $running;
  76 }
  77
  78 sub phase1 {
  79     my ($self, $vmid) = @_;
  80
  81     $self->log('info', "starting migration of CT $self->{vmid} to node '$self->{node}' ($self->{nodeip})");
  82
  83     my $conf = $self->{vmconf};
  84     $conf->{lock} = 'migrate';
  85     PVE::LXC::Config->write_config($vmid, $conf);
  86
  87     if ($self->{running}) {
  88         $self->log('info', "container is running - using online migration");
  89     }
  90
  91     $self->{volumes} = [];
  92
  93     PVE::LXC::Config->foreach_mountpoint($conf, sub {
  94         my ($ms, $mountpoint) = @_;
  95
  96         my $volid = $mountpoint->{volume};
  97
  98         # already checked in prepare
  99         if ($mountpoint->{type} ne 'volume') {
 100             $self->log('info', "ignoring mountpoint '$ms' ('$volid') of type " .
 101                 "'$mountpoint->{type}', migration is forced.");
 102             return;
 103         }
 104
 105         my ($storage, $volname) = PVE::Storage::parse_volume_id($volid);
 106         my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $storage);
 107
 108         if (!$scfg->{shared}) {
 109
 110             $self->log('info', "copy mountpoint '$ms' ($volid) to node ' $self->{node}'");
 111             PVE::Storage::storage_migrate($self->{storecfg}, $volid, $self->{nodeip}, $storage);
 112             push @{$self->{volumes}}, $volid;
 113         } else {
 114             $self->log('info', "mountpoint '$ms' is on shared storage '$storage'");
 115         }
 116     });
 117
 118     my $conffile = PVE::LXC::Config->config_file($vmid);
 119     my $newconffile = PVE::LXC::Config->config_file($vmid, $self->{node});
 120
 121     if ($self->{running}) {
 122         die "implement me";
 123     }
 124
 125     # make sure everything on (shared) storage is unmounted
 126     # Note: we must be 100% sure, else we get data corruption because
 127     # non-shared file system could be mounted twice (on shared storage)
 128
 129     PVE::LXC::umount_all($vmid, $self->{storecfg}, $conf);
 130
 131     #to be sure there are no active volumes
 132     my $vollist = PVE::LXC::Config->get_vm_volumes($conf);
 133     PVE::Storage::deactivate_volumes($self->{storecfg}, $vollist);
 134
 135     # move config
 136     die "Failed to move config to node '$self->{node}' - rename failed: $!\n"
 137         if !rename($conffile, $newconffile);
 138
 139     $self->{conf_migrated} = 1;
 140 }
 141
 142 sub phase1_cleanup {
 143     my ($self, $vmid, $err) = @_;
 144
 145     $self->log('info', "aborting phase 1 - cleanup resources");
 146
 147     if ($self->{volumes}) {
 148         foreach my $volid (@{$self->{volumes}}) {
 149             $self->log('err', "found stale volume copy '$volid' on node '$self->{node}'");
 150             # fixme: try to remove ?
 151         }
 152     }
 153 }
 154
 155 sub phase3 {
 156     my ($self, $vmid) = @_;
 157
 158     my $volids = $self->{volumes};
 159
 160     # destroy local copies
 161     foreach my $volid (@$volids) {
 162         eval { PVE::Storage::vdisk_free($self->{storecfg}, $volid); };
 163         if (my $err = $@) {
 164             $self->log('err', "removing local copy of '$volid' failed - $err");
 165             $self->{errors} = 1;
 166             last if $err =~ /^interrupted by signal$/;
 167         }
 168     }
 169 }
 170
 171 sub final_cleanup {
 172     my ($self, $vmid) = @_;
 173
 174     $self->log('info', "start final cleanup");
 175
 176     if (!$self->{conf_migrated}) {
 177         my $conf = $self->{vmconf};
 178         delete $conf->{lock};
 179
 180         eval { PVE::LXC::Config->write_config($vmid, $conf); };
 181         if (my $err = $@) {
 182             $self->log('err', $err);
 183         }
 184     } else {
 185         my $cmd = [ @{$self->{rem_ssh}}, 'pct', 'unlock', $vmid ];
 186         $self->cmd_logerr($cmd, errmsg => "failed to clear migrate lock");
 187     }
 188 }
 189
 190 1;