/[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 26 - (show annotations)
Thu Oct 4 23:23:20 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 4347 byte(s)
clone lv are now always named vz-clone-10VEID and not
dependent on OpenVZ lv name
1 #!/usr/bin/perl -w
2
3 use strict;
4 use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs vzctl/;
5
6 my $vz = '/vz';
7 my $conf = '/etc/vz/conf';
8
9 my $snap_size = '100M';
10
11 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 ( $v[2] =~ m!vz-clone-$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";
45
46 die "$VEID config $orig_conf doesn't exist\n" unless -e $orig_conf;
47
48 print "Clone VE $VEID -> $CVEID\n";
49
50 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 $clone = "vz-clone-$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 {
149 my $ip = shift;
150 $ip =~ s/['"]//g;
151 $ip =~ s/^\d+\./10./;
152 warn "$CVEID new IP number: $ip\n";
153 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: $!";
165 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
166 while(<$o>) {
167 s!^HOSTNAME=(.*)$!fix_hostname($1)!ie;
168 s!^IP_ADDRESS=(.*)$!fix_ip($1)!ie;
169 s!^(ONBOOT=).*$!# modified by $0\n$1"no"!i;
170 print $n $_;
171 }
172
173 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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