/[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 27 - (show annotations)
Thu Oct 4 23:42:24 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 4632 byte(s)
variable to skip snapshot usage,
fixed logic which machine to vzctl stop on create/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 = '100M';
10
11 my ( $action, $VEID ) = @ARGV;
12
13 my $use_snapshot = 0;
14
15 my $valid_actions = 'create|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
31 if ( $action eq 'create' ) {
32 vzctl_stop( $CVEID );
33 } elsif ( $action eq 'destroy' ) {
34 vzctl_stop( $VEID );
35 }
36
37
38 if ( 1 || $action =~ m/(umount|destroy)/ ) {
39 my $clone;
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$! && $v[5] =~ m/bind/ ) {
44 umount( $v[2] );
45 } elsif ( $v[2] =~ m!vz-clone-$VEID$! ) {
46 $clone = $v[2];
47 }
48 }
49 umount( $clone ) if $clone;
50 }
51
52 #die "unknown action: $action" unless $action eq 'create';
53 exit unless $action eq 'create';
54
55 my $orig_conf = "/etc/vz/conf/$VEID.conf";
56
57 die "$VEID config $orig_conf doesn't exist\n" unless -e $orig_conf;
58
59 print "Clone VE $VEID -> $CVEID\n";
60
61 my $vz_lv;
62
63 open(my $m, '<', '/etc/fstab') || die "can't open /etc/fstab: $!";
64 while(<$m>) {
65 next if m/^#/;
66 my @v = split(/\s+/,$_);
67 if ( $v[1] =~ m/\Q$vz\E/ ) {
68 $vz_lv = $v[0];
69 warn "found LV $vz_lv for $vz\n";
70 last;
71 }
72 }
73
74 sub fs_quota {
75 my $id = shift;
76 open(my $q, '-|', "vzquota -b show $id") || die "can't exec vzquota show $id: $!";
77 my $l = <$q>;
78 $l =~ s/^\s+//;
79 my ( $usage, $soft, $hard ) = split(/\s+/,$l);
80 warn "quota for $id | $soft < $hard | usage: $usage\n";
81 return ( $usage, $soft, $hard ) if wantarray;
82 return $soft;
83 }
84
85 sub copy_files {
86 my ( $from, $to ) = @_;
87 warn "rsync $from -> $to\n";
88 rsync('-raSHAD', "$from/", "$to/" );
89 }
90
91 if ( $vz_lv ) {
92
93 my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m!^(.+)/([^/]+)$! );
94
95 my $snap = $vz_lv_name . '-snap';
96 my $clone = "vz-clone-$CVEID";
97
98 sub do_mount {
99 my ( $from, $to ) = @_;
100 mkdir $to || die "can't create $to: $!";
101 print "Mounting $from to $to\n";
102 mount( $from, $to, '-o', 'noatime' );
103 }
104
105 sub test_mkdir {
106 my $dir = shift;
107 if ( ! -d $dir ) {
108 mkdir $dir || die "can't mkdir $dir: $!";
109 }
110 }
111
112 sub mount_bind {
113 my ( $from, $to ) = @_;
114 die "$from doesn't exist!" unless -d $from;
115 test_mkdir( $to );
116 mount( '--bind', $from, $to );
117 }
118
119 if ( $use_snapshot ) {
120
121 print "Creating $snap_size snapshot $snap from $vz_lv\n";
122 lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
123
124 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
125
126 }
127
128 my $clone_size = fs_quota( $VEID ) . 'k';
129 my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! );
130
131 if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
132 warn "using existing $vz_lv_path/$clone\n";
133 } else {
134 print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
135 lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
136 mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
137 }
138
139 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
140
141 test_mkdir( "/tmp/$clone/private" );
142 test_mkdir( "/tmp/$clone/root" );
143
144 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
145 mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
146
147 if ( $use_snapshot ) {
148
149 copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
150
151 print "Cleanup\n";
152
153 #umount( "$vz_lv_path/$clone" );
154 umount( "$vz_lv_path/$snap" );
155
156 lvremove( '-f', "$vz_lv_path/$snap" );
157
158 } else {
159 copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
160
161 }
162
163 } else {
164
165 copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
166 }
167
168 my $note = "# modified by $0\n";
169
170 sub fix_ip {
171 my $ip = shift;
172 $ip =~ s/['"]//g;
173 $ip =~ s/^\d+\./10./;
174 warn "$CVEID new IP number: $ip\n";
175 return $note . qq{IP_ADDRESS="$ip"};
176 }
177
178 sub fix_hostname {
179 my $hostname = shift;
180 $hostname =~ s/['"]//g;
181 $hostname = "clone-$hostname";
182 warn "$CVEID new hostname: $hostname\n";
183 return $note . qq{HOSTNAME="$hostname"};
184 }
185
186 open(my $o, '<', "$conf/$VEID.conf") || die "can't open $conf/$VEID.conf: $!";
187 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
188 while(<$o>) {
189 s!^HOSTNAME=(.*)$!fix_hostname($1)!ie;
190 s!^IP_ADDRESS=(.*)$!fix_ip($1)!ie;
191 s!^(ONBOOT=).*$!# modified by $0\n$1"no"!i;
192 print $n $_;
193 }
194
195 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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