/[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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Contents of /trunk/vz-clone.pl

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Revision 24 - (show annotations)
Thu Oct 4 18:54:41 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 3651 byte(s)
rsync know how to handle device and special files, ssync doesn't.
So it's out...
1 #!/usr/bin/perl -w
2
3 use strict;
4 use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs/;
5
6 my $vz = '/vz';
7 my $conf = '/etc/vz/conf';
8
9 my $snap_size = '100M';
10
11 my $VEID = shift @ARGV || die "Usage: $0 VEID\n\n",vzlist;
12
13 my $CVEID = "10$VEID";
14
15 my $orig_conf = "/etc/vz/conf/$VEID.conf";
16
17 die "$VEID config $orig_conf doesn't exist\n" unless -e $orig_conf;
18
19 print "Clone VE $VEID -> $CVEID\n";
20
21 my $vz_lv;
22
23 open(my $m, '<', '/etc/fstab') || die "can't open /etc/fstab: $!";
24 while(<$m>) {
25 next if m/^#/;
26 my @v = split(/\s+/,$_);
27 if ( $v[1] =~ m/\Q$vz\E/ ) {
28 $vz_lv = $v[0];
29 warn "found LV $vz_lv for $vz\n";
30 last;
31 }
32 }
33
34 sub fs_quota {
35 my $id = shift;
36 open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!";
37 my $l = <$q>;
38 $l =~ s/^\s+//;
39 my ( $usage, $soft, $hard ) = split(/\s+/,$l);
40 warn "quota for $id | $soft < $hard | usage: $usage\n";
41 return ( $usage, $soft, $hard ) if wantarray;
42 return $soft;
43 }
44
45 sub copy_files {
46 my ( $from, $to ) = @_;
47 warn "rsync $from -> $to\n";
48 rsync('-raSHAD', "$from/", "$to/" );
49 }
50
51 if ( $vz_lv ) {
52
53 my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! );
54
55 my $snap = $vz_lv_name . '-snap';
56 my $clone = "$vz_lv_name-clone-$CVEID";
57
58 sub do_mount {
59 my ( $from, $to ) = @_;
60 mkdir $to || die "can't create $to: $!";
61 print "Mounting $from to $to\n";
62 mount( $from, $to, '-o', 'noatime' );
63 }
64
65 sub test_mkdir {
66 my $dir = shift;
67 if ( ! -d $dir ) {
68 mkdir $dir || die "can't mkdir $dir: $!";
69 }
70 }
71
72 sub mount_bind {
73 my ( $from, $to ) = @_;
74 die "$from doesn't exist!" unless -d $from;
75 test_mkdir( $to );
76 mount( '--bind', $from, $to );
77 }
78
79 print "Creating $snap_size snapshot $snap from $vz_lv\n";
80 lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
81
82 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
83
84 my $clone_size = fs_quota( $VEID ) . 'k';
85 my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! );
86
87 if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
88 warn "using existing $vz_lv_path/$clone\n";
89 } else {
90 print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
91 lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
92 mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
93 }
94
95 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
96
97 test_mkdir( "/tmp/$clone/private" );
98 test_mkdir( "/tmp/$clone/root" );
99
100 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
101 mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
102
103 copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
104
105 print "Cleanup\n";
106
107 #umount( "$vz_lv_path/$clone" );
108 umount( "$vz_lv_path/$snap" );
109
110 lvremove( '-f', "$vz_lv_path/$snap" );
111
112 } else {
113
114 copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
115 }
116
117 my $note = "# modified by $0\n";
118
119 sub fix_ip {
120 my $ip = shift;
121 $ip =~ s/['"]//g;
122 $ip =~ s/^\d+\./10./;
123 warn "$CVEID new IP number: $ip\n";
124 return $note . qq{IP_ADDRESS="$ip"};
125 }
126
127 sub fix_hostname {
128 my $hostname = shift;
129 $hostname =~ s/['"]//g;
130 $hostname = "clone-$hostname";
131 warn "$CVEID new hostname: $hostname\n";
132 return $note . qq{HOSTNAME="$hostname"};
133 }
134
135 open(my $o, '<', "$conf/$VEID.conf") || die "can't open $conf/$VEID.conf: $!";
136 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
137 while(<$o>) {
138 s!^HOSTNAME=(.*)$!fix_hostname($1)!ie;
139 s!^IP_ADDRESS=(.*)$!fix_ip($1)!ie;
140 s!^(ONBOOT=).*$!# modified by $0\n$1"no"!i;
141 print $n $_;
142 }
143
144 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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