/[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 66 - (show annotations)
Fri Feb 27 20:49:06 2009 UTC (15 years, 1 month ago) by dpavlin
File MIME type: text/plain
File size: 4923 byte(s)
remove snapshot on destroy
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 = '1G';
10
11 my ( $action, $VEID ) = @ARGV;
12
13 my $use_snapshot = 1;
14
15 my $valid_actions = 'create|mount|umount|destroy';
16
17 die "Usage: $0 ($valid_actions) VEID\n\n",vzlist unless $VEID && $action && $action =~ m/($valid_actions)/;
18
19 my $CVEID = "10$VEID";
20
21 sub vzctl_stop {
22 my $veid = shift;
23 my $vzlist = vzlist();
24 if ( $vzlist =~ m/$veid/ ) {
25 print "stop $veid\n";
26 vzctl('stop', $veid);
27 }
28 }
29
30 if ( $action eq 'create' ) {
31 vzctl_stop( $CVEID );
32 } elsif ( $action eq 'destroy' ) {
33 vzctl_stop( $VEID );
34 }
35
36
37 if ( $action =~ m{(create|umount|destroy)} ) {
38 my $clone;
39 my $snap;
40 open(my $m, '-|', 'mount') || die "can't open mount: $!";
41 while(<$m>) {
42 my @v = split(/\s+/,$_);
43 if ( $v[2] =~ m{/(private|root)/($VEID|$CVEID)$} && $v[5] =~ m{bind} ) {
44 umount( $v[2] );
45 } elsif ( $v[2] =~ m{vz-clone-$CVEID$} ) {
46 $clone = $v[2];
47 } elsif ( $v[2] =~ m{-snap} ) {
48 $snap = $v[0];
49 umount( $snap );
50 }
51 }
52 umount( $clone ) if $clone;
53 if ( $action eq 'destroy' && -e $snap ) {
54 lvremove( '-f', $snap );
55 exit;
56 }
57
58 exit if $action eq 'umount';
59 }
60
61
62 my $orig_conf = "/etc/vz/conf/$VEID.conf";
63
64 die "$VEID config $orig_conf doesn't exist\n" unless -e $orig_conf;
65
66 print "Clone VE $VEID -> $CVEID\n";
67
68 my $vz_lv;
69
70 open(my $m, '<', '/etc/fstab') || die "can't open /etc/fstab: $!";
71 while(<$m>) {
72 next if m/^#/;
73 my @v = split(/\s+/,$_);
74 if ( $v[1] =~ m/\Q$vz\E/ ) {
75 $vz_lv = $v[0];
76 warn "found LV $vz_lv for $vz\n";
77 last;
78 }
79 }
80
81 sub fs_quota {
82 my $id = shift;
83 open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!";
84 my $l = <$q>;
85 $l =~ s/^\s+//;
86 my ( $usage, $soft, $hard ) = split(/\s+/,$l);
87 warn "quota for $id | $soft < $hard | usage: $usage\n";
88 return ( $usage, $soft, $hard ) if wantarray;
89 return $soft;
90 }
91
92 sub copy_files {
93 my ( $from, $to ) = @_;
94 return if $action ne 'create';
95 warn "rsync $from -> $to\n";
96 rsync('-raSHAD', '--delete', "$from/", "$to/" );
97 }
98
99 if ( $vz_lv ) {
100
101 my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m{^(.+)/([^/]+)$} );
102
103 my $snap = $vz_lv_name . '-snap';
104 my $clone = "vz-clone-$CVEID";
105
106 sub do_mount {
107 my ( $from, $to ) = @_;
108 mkdir $to || die "can't create $to: $!";
109 print "Mounting $from to $to\n";
110 mount( $from, $to, '-o', 'noatime' );
111 }
112
113 sub test_mkdir {
114 my $dir = shift;
115 if ( ! -d $dir ) {
116 mkdir $dir || die "can't mkdir $dir: $!";
117 }
118 }
119
120 sub mount_bind {
121 my ( $from, $to ) = @_;
122 die "$from doesn't exist!" unless -d $from;
123 test_mkdir( $to );
124 mount( '--bind', $from, $to );
125 }
126
127 if ( $use_snapshot ) {
128
129 print "Creating $snap_size snapshot $snap from $vz_lv\n";
130 lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
131
132 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
133
134 mount_bind( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
135 mount_bind( "/tmp/$snap/root/$VEID", "$vz/root/$CVEID" );
136
137 } else {
138
139 if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
140 warn "using existing $vz_lv_path/$clone\n";
141 } else {
142 my $vg_name = $1 if ( $vz_lv_path =~ m{/([^/]+)/*$} );
143 my $clone_size = fs_quota( $VEID ) . 'k';
144 print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
145 lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
146 mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
147 }
148
149 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
150
151 test_mkdir( "/tmp/$clone/private" );
152 test_mkdir( "/tmp/$clone/root" );
153
154 copy_files( "$vz/private/$VEID", "/tmp/$clone/private" );
155
156 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
157 mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
158
159 }
160
161 } else {
162
163 copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
164 }
165
166 exit if $action eq 'mount';
167
168 my $note = "# modified by $0\n";
169
170 my $ve_clone_ip;
171
172 sub fix_ip {
173 my $ip = shift;
174 $ip =~ s/['"]//g;
175 # $ip =~ s/^\d+\./10./;
176 $ip =~ s/^\d+\.\d+\./192.168./;
177 warn "$CVEID new IP number: $ip\n";
178 $ve_clone_ip = $ip;
179 return $note . qq{IP_ADDRESS="$ip"};
180 }
181
182 sub fix_hostname {
183 my $hostname = shift;
184 $hostname =~ s/['"]//g;
185 $hostname = "clone-$hostname";
186 warn "$CVEID new hostname: $hostname\n";
187 return $note . qq{HOSTNAME="$hostname"};
188 }
189
190 open(my $o, '<', "$conf/$VEID.conf") || die "can't open $conf/$VEID.conf: $!";
191 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
192 while(<$o>) {
193 s{^HOSTNAME=(.*)$}{fix_hostname($1)}ie;
194 s{^IP_ADDRESS=(.*)$}{fix_ip($1)}ie;
195 s{^(ONBOOT=).*$}{# modified by $0\n$1"no"}i;
196 print $n $_;
197 }
198
199 print $n qq{DISK_QUOTA="no"\n} if $use_snapshot; # don't wait for quota rebuild on startup
200
201 print "\nPlease review config file: $conf/$CVEID.conf\nAdd NAT for new VE with: iptables -t nat -A POSTROUTING -s $ve_clone_ip -o eth0 -j MASQUERADE\nStart clone of $VEID with: vzctl start $CVEID\n"
202

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