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

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Revision 66 - (hide 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 dpavlin 20 #!/usr/bin/perl -w
2    
3     use strict;
4 dpavlin 25 use Shell qw/rsync vzlist lvcreate mount umount lvremove which lvdisplay mke2fs vzctl/;
5 dpavlin 20
6     my $vz = '/vz';
7     my $conf = '/etc/vz/conf';
8    
9 dpavlin 65 my $snap_size = '1G';
10 dpavlin 21
11 dpavlin 25 my ( $action, $VEID ) = @ARGV;
12 dpavlin 20
13 dpavlin 65 my $use_snapshot = 1;
14 dpavlin 27
15 dpavlin 29 my $valid_actions = 'create|mount|umount|destroy';
16 dpavlin 25
17     die "Usage: $0 ($valid_actions) VEID\n\n",vzlist unless $VEID && $action && $action =~ m/($valid_actions)/;
18    
19 dpavlin 27 my $CVEID = "10$VEID";
20    
21     sub vzctl_stop {
22     my $veid = shift;
23 dpavlin 25 my $vzlist = vzlist();
24 dpavlin 27 if ( $vzlist =~ m/$veid/ ) {
25     print "stop $veid\n";
26     vzctl('stop', $veid);
27 dpavlin 25 }
28     }
29    
30 dpavlin 27 if ( $action eq 'create' ) {
31     vzctl_stop( $CVEID );
32     } elsif ( $action eq 'destroy' ) {
33     vzctl_stop( $VEID );
34     }
35    
36    
37 dpavlin 66 if ( $action =~ m{(create|umount|destroy)} ) {
38 dpavlin 25 my $clone;
39 dpavlin 66 my $snap;
40 dpavlin 25 open(my $m, '-|', 'mount') || die "can't open mount: $!";
41     while(<$m>) {
42     my @v = split(/\s+/,$_);
43 dpavlin 66 if ( $v[2] =~ m{/(private|root)/($VEID|$CVEID)$} && $v[5] =~ m{bind} ) {
44 dpavlin 25 umount( $v[2] );
45 dpavlin 64 } elsif ( $v[2] =~ m{vz-clone-$CVEID$} ) {
46 dpavlin 25 $clone = $v[2];
47 dpavlin 66 } elsif ( $v[2] =~ m{-snap} ) {
48     $snap = $v[0];
49     umount( $snap );
50 dpavlin 25 }
51     }
52     umount( $clone ) if $clone;
53 dpavlin 66 if ( $action eq 'destroy' && -e $snap ) {
54     lvremove( '-f', $snap );
55     exit;
56     }
57 dpavlin 30
58     exit if $action eq 'umount';
59 dpavlin 25 }
60    
61    
62 dpavlin 20 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 dpavlin 21 my $vz_lv;
69 dpavlin 20
70 dpavlin 21 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 dpavlin 23 warn "found LV $vz_lv for $vz\n";
77 dpavlin 21 last;
78     }
79     }
80    
81 dpavlin 23 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 dpavlin 21 sub copy_files {
93     my ( $from, $to ) = @_;
94 dpavlin 29 return if $action ne 'create';
95 dpavlin 24 warn "rsync $from -> $to\n";
96 dpavlin 31 rsync('-raSHAD', '--delete', "$from/", "$to/" );
97 dpavlin 21 }
98    
99     if ( $vz_lv ) {
100    
101 dpavlin 64 my ( $vz_lv_path, $vz_lv_name ) = ( $1, $2 ) if ( $vz_lv =~ m{^(.+)/([^/]+)$} );
102 dpavlin 21
103     my $snap = $vz_lv_name . '-snap';
104 dpavlin 26 my $clone = "vz-clone-$CVEID";
105 dpavlin 23
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 dpavlin 27 if ( $use_snapshot ) {
128 dpavlin 21
129 dpavlin 27 print "Creating $snap_size snapshot $snap from $vz_lv\n";
130     lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
131 dpavlin 21
132 dpavlin 27 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
133    
134 dpavlin 65 mount_bind( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
135     mount_bind( "/tmp/$snap/root/$VEID", "$vz/root/$CVEID" );
136 dpavlin 27
137 dpavlin 23 } else {
138 dpavlin 21
139 dpavlin 65 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/$clone" );
147     }
148 dpavlin 21
149 dpavlin 65 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
150 dpavlin 21
151 dpavlin 65 test_mkdir( "/tmp/$clone/private" );
152     test_mkdir( "/tmp/$clone/root" );
153 dpavlin 21
154 dpavlin 65 copy_files( "$vz/private/$VEID", "/tmp/$clone/private" );
155 dpavlin 23
156 dpavlin 65 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
157     mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
158 dpavlin 23
159 dpavlin 27 }
160    
161 dpavlin 21 } else {
162    
163     copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
164     }
165    
166 dpavlin 29 exit if $action eq 'mount';
167    
168 dpavlin 21 my $note = "# modified by $0\n";
169    
170 dpavlin 50 my $ve_clone_ip;
171    
172 dpavlin 20 sub fix_ip {
173     my $ip = shift;
174 dpavlin 21 $ip =~ s/['"]//g;
175 dpavlin 33 # $ip =~ s/^\d+\./10./;
176     $ip =~ s/^\d+\.\d+\./192.168./;
177 dpavlin 20 warn "$CVEID new IP number: $ip\n";
178 dpavlin 50 $ve_clone_ip = $ip;
179 dpavlin 21 return $note . qq{IP_ADDRESS="$ip"};
180 dpavlin 20 }
181    
182 dpavlin 21 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 dpavlin 20 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 dpavlin 62 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 dpavlin 20 print $n $_;
197     }
198    
199 dpavlin 65 print $n qq{DISK_QUOTA="no"\n} if $use_snapshot; # don't wait for quota rebuild on startup
200    
201 dpavlin 50 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 dpavlin 66

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