/[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 27 - (hide 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 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 21 my $snap_size = '100M';
10    
11 dpavlin 25 my ( $action, $VEID ) = @ARGV;
12 dpavlin 20
13 dpavlin 27 my $use_snapshot = 0;
14    
15 dpavlin 25 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 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
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 dpavlin 25 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 dpavlin 26 } elsif ( $v[2] =~ m!vz-clone-$VEID$! ) {
46 dpavlin 25 $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 dpavlin 20 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 dpavlin 21 my $vz_lv;
62 dpavlin 20
63 dpavlin 21 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 dpavlin 23 warn "found LV $vz_lv for $vz\n";
70 dpavlin 21 last;
71     }
72     }
73    
74 dpavlin 23 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 dpavlin 21 sub copy_files {
86     my ( $from, $to ) = @_;
87 dpavlin 24 warn "rsync $from -> $to\n";
88     rsync('-raSHAD', "$from/", "$to/" );
89 dpavlin 21 }
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 dpavlin 26 my $clone = "vz-clone-$CVEID";
97 dpavlin 23
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 dpavlin 27 if ( $use_snapshot ) {
120 dpavlin 21
121 dpavlin 27 print "Creating $snap_size snapshot $snap from $vz_lv\n";
122     lvcreate( '--size', $snap_size, '--snapshot', '--name', $snap, $vz_lv );
123 dpavlin 21
124 dpavlin 27 do_mount( "$vz_lv_path/$snap", "/tmp/$snap" );
125    
126     }
127    
128 dpavlin 23 my $clone_size = fs_quota( $VEID ) . 'k';
129     my $vg_name = $1 if ( $vz_lv_path =~ m!/([^/]+)/*$! );
130 dpavlin 21
131 dpavlin 23 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/$clone" );
137     }
138 dpavlin 21
139 dpavlin 23 do_mount( "$vz_lv_path/$clone", "/tmp/$clone" );
140 dpavlin 21
141 dpavlin 23 test_mkdir( "/tmp/$clone/private" );
142     test_mkdir( "/tmp/$clone/root" );
143 dpavlin 21
144 dpavlin 23 mount_bind( "/tmp/$clone/private", "$vz/private/$CVEID" );
145     mount_bind( "/tmp/$clone/root", "$vz/root/$CVEID" );
146 dpavlin 21
147 dpavlin 27 if ( $use_snapshot ) {
148 dpavlin 23
149 dpavlin 27 copy_files( "/tmp/$snap/private/$VEID", "$vz/private/$CVEID" );
150 dpavlin 23
151 dpavlin 27 print "Cleanup\n";
152 dpavlin 23
153 dpavlin 27 #umount( "$vz_lv_path/$clone" );
154     umount( "$vz_lv_path/$snap" );
155 dpavlin 21
156 dpavlin 27 lvremove( '-f', "$vz_lv_path/$snap" );
157    
158     } else {
159     copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
160    
161     }
162    
163 dpavlin 21 } else {
164    
165     copy_files( "$vz/private/$VEID", "$vz/private/$CVEID" );
166     }
167    
168     my $note = "# modified by $0\n";
169    
170 dpavlin 20 sub fix_ip {
171     my $ip = shift;
172 dpavlin 21 $ip =~ s/['"]//g;
173 dpavlin 20 $ip =~ s/^\d+\./10./;
174     warn "$CVEID new IP number: $ip\n";
175 dpavlin 21 return $note . qq{IP_ADDRESS="$ip"};
176 dpavlin 20 }
177    
178 dpavlin 21 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 dpavlin 20 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 dpavlin 21 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 dpavlin 20 print $n $_;
193     }
194    
195 dpavlin 22 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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