/[vz-tools]/trunk/vz-clone.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Diff of /trunk/vz-clone.pl

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revision 20 by dpavlin, Thu Oct 4 11:30:05 2007 UTC revision 25 by dpavlin, Thu Oct 4 23:19:33 2007 UTC
# Line 1  Line 1 
1  #!/usr/bin/perl -w  #!/usr/bin/perl -w
2    
3  use strict;  use strict;
4  use Shell qw/rsync vzlist/;  use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs vzctl/;
5    
6  my $vz   = '/vz';  my $vz   = '/vz';
7  my $conf = '/etc/vz/conf';  my $conf = '/etc/vz/conf';
8    
9  my $VEID = shift @ARGV || die "Usage: $0 VEID\n\n",vzlist;  my $snap_size = '100M';
10    
11  my $CVEID = "99$VEID";  my ( $action, $VEID ) = @ARGV;
12    
13    my $valid_actions = 'create|umount|destroy';
14    
15    die "Usage: $0 ($valid_actions) VEID\n\n",vzlist unless $VEID && $action && $action =~ m/($valid_actions)/;
16    
17    if ( $action eq 'destroy' ) {
18            my $vzlist = vzlist();
19            if ( $vzlist =~ m/$VEID/ ) {
20                    print "stop $VEID\n";
21                    vzctl('stop', $VEID);
22            }
23    }
24    
25    if ( $action =~ m/(umount|destroy)/ ) {
26            my $clone;
27            open(my $m, '-|', 'mount') || die "can't open mount: $!";
28            while(<$m>) {
29                    my @v = split(/\s+/,$_);
30                    if ( $v[2] =~ m!/(private|root)/$VEID$! && $v[5] =~ m/bind/ ) {
31                            umount( $v[2] );
32                    } elsif ( $v[2] =~ m!-clone-$VEID$! ) {
33                            $clone = $v[2];
34                    }
35            }
36            umount( $clone ) if $clone;
37    }
38    
39    #die "unknown action: $action" unless $action eq 'create';
40    exit unless $action eq 'create';
41    
42    my $CVEID = "10$VEID";
43    
44  my $orig_conf = "/etc/vz/conf/$VEID.conf";  my $orig_conf = "/etc/vz/conf/$VEID.conf";
45    
# Line 16  die "$VEID config $orig_conf doesn't exi Line 47  die "$VEID config $orig_conf doesn't exi
47    
48  print "Clone VE $VEID -> $CVEID\n";  print "Clone VE $VEID -> $CVEID\n";
49    
50  rsync('-ra', "$vz/private/$VEID", "$vz/private/$CVEID" );  my $vz_lv;
51    
52    open(my $m, '<', '/etc/fstab') || die "can't open /etc/fstab: $!";
53    while(<$m>) {
54            next if m/^#/;
55            my @v = split(/\s+/,$_);
56            if ( $v[1] =~ m/\Q$vz\E/ ) {
57                    $vz_lv = $v[0];
58                    warn "found LV $vz_lv for $vz\n";
59                    last;
60            }
61    }
62    
63    sub fs_quota {
64            my $id = shift;
65            open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!";
66            my $l = <$q>;
67            $l =~ s/^\s+//;
68            my ( $usage, $soft, $hard ) = split(/\s+/,$l);
69            warn "quota for $id | $soft < $hard | usage: $usage\n";
70            return ( $usage, $soft, $hard ) if wantarray;
71            return $soft;
72    }
73    
74    sub copy_files {
75            my ( $from, $to ) = @_;
76            warn "rsync $from -> $to\n";
77            rsync('-raSHAD', "$from/", "$to/" );
78    }
79    
80    if ( $vz_lv ) {
81    
82            my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! );
83    
84            my $snap = $vz_lv_name . '-snap';
85            my $clone = "$vz_lv_name-clone-$CVEID";
86    
87            sub do_mount {
88                    my ( $from, $to ) = @_;
89                    mkdir $to || die "can't create $to: $!";
90                    print "Mounting $from to $to\n";
91                    mount( $from, $to, '-o', 'noatime' );
92            }
93    
94            sub test_mkdir {
95                    my $dir = shift;
96                    if ( ! -d $dir ) {
97                            mkdir $dir || die "can't mkdir $dir: $!";
98                    }
99            }
100    
101            sub mount_bind {
102                    my ( $from, $to ) = @_;
103                    die "$from doesn't exist!" unless -d $from;
104                    test_mkdir( $to );
105                    mount( '--bind', $from, $to );
106            }
107    
108            print "Creating $snap_size snapshot $snap from $vz_lv\n";
109            lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
110    
111            do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
112    
113            my $clone_size = fs_quota( $VEID ) . 'k';
114            my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! );
115    
116            if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
117                    warn "using existing $vz_lv_path/$clone\n";
118            } else {
119                    print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
120                    lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
121                    mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
122            }
123    
124            do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
125    
126            test_mkdir( "/tmp/$clone/private" );
127            test_mkdir( "/tmp/$clone/root" );
128    
129            mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
130            mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
131    
132            copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
133    
134            print "Cleanup\n";
135    
136            #umount( "$vz_lv_path/$clone" );
137            umount( "$vz_lv_path/$snap" );
138    
139            lvremove( '-f', "$vz_lv_path/$snap" );
140    
141    } else {
142    
143            copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
144    }
145    
146    my $note = "# modified by $0\n";
147    
148  sub fix_ip {  sub fix_ip {
149          my $ip = shift;          my $ip = shift;
150            $ip =~ s/['"]//g;
151          $ip =~ s/^\d+\./10./;          $ip =~ s/^\d+\./10./;
152          warn "$CVEID new IP number: $ip\n";          warn "$CVEID new IP number: $ip\n";
153          return qq{IP_ADDRESS=$ip};          return $note . qq{IP_ADDRESS="$ip"};
154    }
155    
156    sub fix_hostname {
157            my $hostname = shift;
158            $hostname =~ s/['"]//g;
159            $hostname = "clone-$hostname";
160            warn "$CVEID new hostname: $hostname\n";
161            return $note . qq{HOSTNAME="$hostname"};
162  }  }
163    
164  open(my $o, '<', "$conf/$VEID.conf")  || die "can't open $conf/$VEID.conf: $!";  open(my $o, '<', "$conf/$VEID.conf")  || die "can't open $conf/$VEID.conf: $!";
165  open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";  open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
166  while(<$o>) {  while(<$o>) {
167          s!^(HOSTNAME=)(.*)$!$1clone-$2!i;          s!^HOSTNAME=(.*)$!fix_hostname($1)!ie;
168          s!^(IP_ADDRESS=.*)$!fix_up($1)!e;          s!^IP_ADDRESS=(.*)$!fix_ip($1)!ie;
169          s!^(ONBOOT=).*$!# modified by $0\n$1="no"!gi;          s!^(ONBOOT=).*$!# modified by $0\n$1"no"!i;
170          print $n $_;          print $n $_;
171  }  }
172    
173  print "Please edit config $conf/$CVEID.conf before vzctl start $CVEID\n"  print "\nPlease review config file: $conf/$CVEID.conf\nAdd NAT for new VE with: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE\nStart clone of $VEID with: vzctl start $CVEID\n"
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