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, $code, @param) = @_;
  18
  19     return PVE::LXC::lock_container($vmid, undef, $code, @param);
  20 }
  21
  22 sub prepare {
  23     my ($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 = $self->{vmconf} = PVE::LXC::load_config($vmid);
  31
  32     PVE::LXC::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 "cant migrate running container without --online\n" if !$online;
  39         $running = 1;
  40     }
  41
  42     PVE::LXC::foreach_mountpoint($conf, sub {
  43         my ($ms, $mountpoint) = @_;
  44
  45         my $volid = $mountpoint->{volume};
  46         my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1) if $volid;
  47         die "can't determine assigned storage for mountpoint '$ms'\n" if !$storage;
  48
  49         # check if storage is available on both nodes
  50         my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $storage);
  51         PVE::Storage::storage_check_node($self->{storecfg}, $storage, $self->{node});
  52
  53         die "unable to migrate local mountpoint '$volid' while CT is running"
  54             if !$scfg->{shared} && $running;
  55
  56     });
  57
  58     my $volid_list = PVE::LXC::get_vm_volumes($conf);
  59     PVE::Storage::activate_volumes($self->{storecfg}, $volid_list);
  60
  61     # todo: test if VM uses local resources
  62
  63     # test ssh connection
  64     my $cmd = [ @{$self->{rem_ssh}}, '/bin/true' ];
  65     eval { $self->cmd_quiet($cmd); };
  66     die "Can't connect to destination address using public key\n" if $@;
  67
  68     return $running;
  69 }
  70
  71 sub phase1 {
  72     my ($self, $vmid) = @_;
  73
  74     $self->log('info', "starting migration of CT $self->{vmid} to node '$self->{node}' ($self->{nodeip})");
  75
  76     my $conf = $self->{vmconf};
  77     $conf->{lock} = 'migrate';
  78     PVE::LXC::write_config($vmid, $conf);
  79
  80     if ($self->{running}) {
  81         $self->log('info', "container is running - using online migration");
  82     }
  83
  84     $self->{volumes} = [];
  85
  86     PVE::LXC::foreach_mountpoint($conf, sub {
  87         my ($ms, $mountpoint) = @_;
  88
  89         my $volid = $mountpoint->{volume};
  90         my ($storage, $volname) = PVE::Storage::parse_volume_id($volid);
  91         my $scfg = PVE::Storage::storage_check_node($self->{storecfg}, $storage);
  92
  93         if (!$scfg->{shared}) {
  94
  95             $self->log('info', "copy mointpoint '$ms' ($volid) to node ' $self->{node}'");
  96             PVE::Storage::storage_migrate($self->{storecfg}, $volid, $self->{nodeip}, $storage);
  97             push @{$self->{volumes}}, $volid;
  98         } else {
  99             $self->log('info', "mointpoint '$ms' is on shared storage '$storage'");
 100         }
 101     });
 102
 103     my $conffile = PVE::LXC::config_file($vmid);
 104     my $newconffile = PVE::LXC::config_file($vmid, $self->{node});
 105
 106     if ($self->{running}) {
 107         die "implement me";
 108     }
 109
 110     # make sure everything on (shared) storage is unmounted
 111     # Note: we must be 100% sure, else we get data corruption because
 112     # non-shared file system could be mounted twice (on shared storage)
 113
 114     PVE::LXC::umount_all($vmid, $self->{storecfg}, $conf);
 115
 116     # move config
 117     die "Failed to move config to node '$self->{node}' - rename failed: $!\n"
 118         if !rename($conffile, $newconffile);
 119
 120     $self->{conf_migrated} = 1;
 121 }
 122
 123 sub phase1_cleanup {
 124     my ($self, $vmid, $err) = @_;
 125
 126     $self->log('info', "aborting phase 1 - cleanup resources");
 127
 128     if ($self->{volumes}) {
 129         foreach my $volid (@{$self->{volumes}}) {
 130             $self->log('err', "found stale volume copy '$volid' on node '$self->{node}'");
 131             # fixme: try to remove ?
 132         }
 133     }
 134 }
 135
 136 sub phase3 {
 137     my ($self, $vmid) = @_;
 138
 139     my $volids = $self->{volumes};
 140
 141     # destroy local copies
 142     foreach my $volid (@$volids) {
 143         eval { PVE::Storage::vdisk_free($self->{storecfg}, $volid); };
 144         if (my $err = $@) {
 145             $self->log('err', "removing local copy of '$volid' failed - $err");
 146             $self->{errors} = 1;
 147             last if $err =~ /^interrupted by signal$/;
 148         }
 149     }
 150 }
 151
 152 sub final_cleanup {
 153     my ($self, $vmid) = @_;
 154
 155     $self->log('info', "start final cleanup");
 156
 157     if (!$self->{conf_migrated}) {
 158         my $conf = $self->{vmconf};
 159         delete $conf->{lock};
 160
 161         eval { PVE::LXC::write_config($vmid, $conf); };
 162         if (my $err = $@) {
 163             $self->log('err', $err);
 164         }
 165     } else {
 166         my $cmd = [ @{$self->{rem_ssh}}, 'pct', 'unlock', $vmid ];
 167         $self->cmd_logerr($cmd, errmsg => "failed to clear migrate lock");
 168     }
 169 }
 170
 171 1;