/[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 65 - (show annotations)
Fri Feb 27 20:05:02 2009 UTC (15 years, 1 month ago) by dpavlin
File MIME type: text/plain
File size: 4777 byte(s)
implement clone on live snapshot with quota turned off
to speed up first startup (which would otherwise check
quota for whole vz logical volume)
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 open(my $m, '-|', 'mount') || die "can't open mount: $!";
40 while(<$m>) {
41 my @v = split(/\s+/,$_);
42 if ( $v[2] =~ m{/(private|root)/$CVEID$} && $v[5] =~ m/bind/ ) {
43 umount( $v[2] );
44 } elsif ( $v[2] =~ m{vz-clone-$CVEID$} ) {
45 $clone = $v[2];
46 }
47 }
48 umount( $clone ) if $clone;
49 lvremove( '-f', $clone );
50
51 exit if $action eq 'umount';
52 }
53
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 return if $action ne 'create';
88 warn "rsync $from -> $to\n";
89 rsync('-raSHAD', '--delete', "$from/", "$to/" );
90 }
91
92 if ( $vz_lv ) {
93
94 my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m{^(.+)/([^/]+)$} );
95
96 my $snap = $vz_lv_name . '-snap';
97 my $clone = "vz-clone-$CVEID";
98
99 sub do_mount {
100 my ( $from, $to ) = @_;
101 mkdir $to || die "can't create $to: $!";
102 print "Mounting $from to $to\n";
103 mount( $from, $to, '-o', 'noatime' );
104 }
105
106 sub test_mkdir {
107 my $dir = shift;
108 if ( ! -d $dir ) {
109 mkdir $dir || die "can't mkdir $dir: $!";
110 }
111 }
112
113 sub mount_bind {
114 my ( $from, $to ) = @_;
115 die "$from doesn't exist!" unless -d $from;
116 test_mkdir( $to );
117 mount( '--bind', $from, $to );
118 }
119
120 if ( $use_snapshot ) {
121
122 print "Creating $snap_size snapshot $snap from $vz_lv\n";
123 lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
124
125 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
126
127 mount_bind( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
128 mount_bind( "/tmp/$snap/root/$VEID", "$vz/root/$CVEID" );
129
130 } else {
131
132 if ( lvdisplay( "$vz_lv_path/$clone" ) ) {
133 warn "using existing $vz_lv_path/$clone\n";
134 } else {
135 my $vg_name = $1 if ( $vz_lv_path =~ m{/([^/]+)/*$} );
136 my $clone_size = fs_quota( $VEID ) . 'k';
137 print "Creating LV $clone ($clone_size bytes) in VG $vg_name for $VEID clone filesystem\n";
138 lvcreate( '--size', $clone_size, '--name', $clone, $vg_name );
139 mke2fs( '-m', 0, '-j', "$vz_lv_path/$clone" );
140 }
141
142 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
143
144 test_mkdir( "/tmp/$clone/private" );
145 test_mkdir( "/tmp/$clone/root" );
146
147 copy_files( "$vz/private/$VEID", "/tmp/$clone/private" );
148
149 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
150 mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
151
152 }
153
154 } else {
155
156 copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
157 }
158
159 exit if $action eq 'mount';
160
161 my $note = "# modified by $0\n";
162
163 my $ve_clone_ip;
164
165 sub fix_ip {
166 my $ip = shift;
167 $ip =~ s/['"]//g;
168 # $ip =~ s/^\d+\./10./;
169 $ip =~ s/^\d+\.\d+\./192.168./;
170 warn "$CVEID new IP number: $ip\n";
171 $ve_clone_ip = $ip;
172 return $note . qq{IP_ADDRESS="$ip"};
173 }
174
175 sub fix_hostname {
176 my $hostname = shift;
177 $hostname =~ s/['"]//g;
178 $hostname = "clone-$hostname";
179 warn "$CVEID new hostname: $hostname\n";
180 return $note . qq{HOSTNAME="$hostname"};
181 }
182
183 open(my $o, '<', "$conf/$VEID.conf") || die "can't open $conf/$VEID.conf: $!";
184 open(my $n, '>', "$conf/$CVEID.conf") || die "can't open $conf/$CVEID.conf: $!";
185 while(<$o>) {
186 s{^HOSTNAME=(.*)$}{fix_hostname($1)}ie;
187 s{^IP_ADDRESS=(.*)$}{fix_ip($1)}ie;
188 s{^(ONBOOT=).*$}{# modified by $0\n$1"no"}i;
189 print $n $_;
190 }
191
192 print $n qq{DISK_QUOTA="no"\n} if $use_snapshot; # don't wait for quota rebuild on startup
193
194 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"

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