| 1 |
#!/usr/bin/perl -w |
| 2 |
# |
| 3 |
# psinib - Perl Snapshot Is Not Incremental Backup |
| 4 |
# |
| 5 |
# written by Dobrica Pavlinusic <dpavlin@rot13.org> 2003-01-03 |
| 6 |
# released under GPL v2 or later. |
| 7 |
# |
| 8 |
# Backup SMB directories using file produced by LinNeighbourhood (or some |
| 9 |
# other program [vi :-)] which produces file in format: |
| 10 |
# |
| 11 |
# smbmount service mountpoint options |
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# |
| 13 |
# |
| 14 |
# usage: |
| 15 |
# $ psinib.pl mountscript |
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|
| 17 |
use strict 'vars'; |
| 18 |
use Data::Dumper; |
| 19 |
use Net::Ping; |
| 20 |
use POSIX qw(strftime); |
| 21 |
use List::Compare; |
| 22 |
use Filesys::SmbClient; |
| 23 |
#use Taint; |
| 24 |
use Fcntl qw(LOCK_EX LOCK_NB); |
| 25 |
use Digest::MD5; |
| 26 |
use File::Basename; |
| 27 |
use Getopt::Long; |
| 28 |
|
| 29 |
# configuration |
| 30 |
my $LOG_TIME_FMT = '%Y-%m-%d %H:%M:%S'; # strftime format for logfile |
| 31 |
my $DIR_TIME_FMT = '%Y%m%d'; # strftime format for backup dir |
| 32 |
|
| 33 |
# define timeout for ping |
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my $PING_TIMEOUT = 5; |
| 35 |
|
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my $LOG = '/var/log/backup.log'; # add path here... |
| 37 |
#$LOG = '/tmp/backup.log'; |
| 38 |
|
| 39 |
# store backups in which directory |
| 40 |
my $BACKUP_DEST = '/backup/isis_backup'; |
| 41 |
#my $BACKUP_DEST = '/tmp/backup/'; |
| 42 |
|
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# files to ignore in backup |
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my @ignore = ('.md5sum', '.backupignore', 'backupignore.txt'); |
| 45 |
|
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# open log |
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open(L, ">> $LOG") || die "can't open log $LOG: $!"; |
| 48 |
select((select(L), $|=1)[0]); # flush output |
| 49 |
|
| 50 |
# make a lock on logfile |
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|
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my $c = 0; |
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{ |
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flock L, LOCK_EX | LOCK_NB and last; |
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sleep 1; |
| 56 |
redo if ++$c < 10; |
| 57 |
# no response for 10 sec, bail out |
| 58 |
xlog("ABORT","can't take lock on $LOG -- another $0 running?"); |
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exit 1; |
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} |
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|
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# taint path: nmblookup should be there! |
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$ENV{'PATH'} = "/usr/bin:/bin"; |
| 64 |
|
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my $use_ping = 1; # deault: use ping to verify that host is up |
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|
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my $result = GetOptions( |
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"ping!" => \$use_ping, "backupdest!" => \$BACKUP_DEST, |
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); |
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|
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my $mounts = shift @ARGV || |
| 72 |
'mountscript'; |
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# die "usage: $0 mountscript"; |
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|
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|
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my @in_backup; # shares which are backeduped this run |
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|
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# init Net::Ping object |
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my $ping; |
| 80 |
if ($use_ping) { |
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$ping = new Net::Ping->new("syn", 2); |
| 82 |
# ping will try tcp connect to netbios-ssn (139) |
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$ping->{port_num} = getservbyname("netbios-ssn", "tcp"); |
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} |
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|
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# do syn ping to cifs port |
| 87 |
sub host_up { |
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my $ping = shift || return; |
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my $host_ip = shift || xlog("host_up didn't get IP"); |
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my $timeout = shift; |
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return 1 if (! $use_ping); |
| 92 |
|
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$ping->ping($host_ip,$timeout); |
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my $return = 0; |
| 95 |
|
| 96 |
while (my ($host,$rtt,$ip) = $ping->ack) { |
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xlog("","HOST: $host [$ip] ACKed in $rtt seconds"); |
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$return = 1 if ($ip eq $host_ip); |
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} |
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return $return; |
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} |
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|
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my $backup_ok = 0; |
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|
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my $smb; |
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my %smb_atime; |
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my %smb_mtime; |
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my %file_md5; |
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|
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open(M, $mounts) || die "can't open $mounts: $!"; |
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while(<M>) { |
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chomp; |
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next if !/^\s*smbmount\s/; |
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my (undef,$share,undef,$opt) = split(/\s+/,$_,4); |
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|
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my ($user,$passwd,$workgroup,$ip); |
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|
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foreach (split(/,/,$opt)) { |
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my ($n,$v) = split(/=/,$_,2); |
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if ($n =~ m/username/i) { |
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if ($v =~ m#^(.+)/(.+)%(.+)$#) { |
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($user,$passwd,$workgroup) = ($1,$2,$3); |
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} elsif ($v =~ m#^(.+)/(.+)$#) { |
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($user,$workgroup) = ($1,$2); |
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} elsif ($v =~ m#^(.+)%(.+)$#) { |
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($user,$passwd) = ($1,$2); |
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} else { |
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$user = $v; |
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} |
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} elsif ($n =~ m#workgroup#i) { |
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$workgroup = $v; |
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} elsif ($n =~ m#ip#i) { |
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$ip = $v; |
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} |
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} |
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|
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push @in_backup,$share; |
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|
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|
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my ($host,$dir,$date_dir) = share2host_dir($share); |
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my $bl = "$BACKUP_DEST/$host/$dir/latest"; # latest backup |
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my $bc = "$BACKUP_DEST/$host/$dir/$date_dir"; # current one |
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my $real_bl; |
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if (-l $bl) { |
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$real_bl=readlink($bl) || die "can't read link $bl: $!"; |
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$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
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if (-l $bc && $real_bl eq $bc) { |
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print "$share allready backuped...\n"; |
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$backup_ok++; |
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next; |
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} |
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|
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} |
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|
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|
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print "working on $share\n"; |
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|
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# try to nmblookup IP |
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$ip = get_ip($share) if (! $ip); |
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|
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if ($ip) { |
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xlog($share,"IP is $ip"); |
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if (host_up($ping, $ip,$PING_TIMEOUT)) { |
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if (snap_share($share,$user,$passwd,$workgroup)) { |
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$backup_ok++; |
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} |
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} |
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} |
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} |
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close(M); |
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|
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xlog("","$backup_ok backups completed of total ".($#in_backup+1)." this time (".int($backup_ok*100/($#in_backup+1))." %)"); |
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|
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1; |
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|
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#------------------------------------------------------------------------- |
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|
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|
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# get IP number from share |
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sub get_ip { |
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my $share = shift; |
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|
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my $host = $1 if ($share =~ m#//([^/]+)/#); |
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|
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my $ip = `nmblookup $host`; |
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if ($ip =~ m/(\d+\.\d+\.\d+\.\d+)\s$host/i) { |
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return $1; |
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} |
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} |
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|
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|
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# write entry to screen and log |
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sub xlog { |
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my $share = shift; |
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my $t = strftime $LOG_TIME_FMT, localtime; |
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my $m = shift || '[no log entry]'; |
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print STDERR $m,"\n"; |
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print L "$t $share\t$m\n"; |
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} |
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|
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# dump warn and dies into log |
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BEGIN { $SIG{'__WARN__'} = sub { xlog('WARN',$_[0]) ; warn $_[0] } } |
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BEGIN { $SIG{'__DIE__'} = sub { xlog('DIE',$_[0]) ; die $_[0] } } |
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|
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|
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# split share name to host, dir and currnet date dir |
| 207 |
sub share2host_dir { |
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my $share = shift; |
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my ($host,$dir); |
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if ($share =~ m#//([^/]+)/(.+)$#) { |
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($host,$dir) = ($1,$2); |
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$dir =~ s/\W/_/g; |
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$dir =~ s/^_+//; |
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$dir =~ s/_+$//; |
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} else { |
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print "Can't parse share $share into host and directory!\n"; |
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return; |
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} |
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return ($host,$dir,strftime $DIR_TIME_FMT, localtime); |
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} |
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|
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|
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# make a snapshot of a share |
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sub snap_share { |
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|
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my $share = shift; |
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|
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my %param = ( debug => 0 ); |
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|
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$param{username} = shift || warn "can't find username for share $share"; |
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$param{password} = shift || warn "can't find passwod for share $share"; |
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$param{workgroup} = shift || warn "can't find workgroup for share $share"; |
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|
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my ($host,$dir,$date_dir) = share2host_dir($share); |
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|
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# latest backup directory |
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my $bl = "$BACKUP_DEST/$host/$dir/latest"; |
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# current backup directory |
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my $bc = "$BACKUP_DEST/$host/$dir/$date_dir"; |
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|
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my $real_bl; |
| 242 |
if (-l $bl) { |
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$real_bl=readlink($bl) || die "can't read link $bl: $!"; |
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$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
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} else { |
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print "no old backup, trying to find last backup, "; |
| 247 |
if (opendir(BL_DIR, "$BACKUP_DEST/$host/$dir")) { |
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my @bl_dirs = sort grep { !/^\./ && -d "$BACKUP_DEST/$host/$dir/$_" } readdir(BL_DIR); |
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closedir(BL_DIR); |
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$real_bl=pop @bl_dirs; |
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print "using $real_bl as latest...\n"; |
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$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
| 253 |
if ($real_bl eq $bc) { |
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xlog($share,"latest from today (possible partial backup)"); |
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rename $real_bl,$real_bl.".partial" || warn "can't reaname partial backup: $!"; |
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$real_bl .= ".partial"; |
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} |
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} else { |
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print "this is first run...\n"; |
| 260 |
} |
| 261 |
} |
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|
| 263 |
if (-l $bc && $real_bl && $real_bl eq $bc) { |
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print "$share allready backuped...\n"; |
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return 1; |
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} |
| 267 |
|
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die "You should really create BACKUP_DEST [$BACKUP_DEST] by hand! " if (!-e $BACKUP_DEST); |
| 269 |
|
| 270 |
if (! -e "$BACKUP_DEST/$host") { |
| 271 |
mkdir "$BACKUP_DEST/$host" || die "can't make dir for host $host, $BACKUP_DEST/$host: $!"; |
| 272 |
print "created host directory $BACKUP_DEST/$host...\n"; |
| 273 |
} |
| 274 |
|
| 275 |
if (! -e "$BACKUP_DEST/$host/$dir") { |
| 276 |
mkdir "$BACKUP_DEST/$host/$dir" || die "can't make dir for share $share, $BACKUP_DEST/$host/$dir $!"; |
| 277 |
print "created dir for share $share, $BACKUP_DEST/$host/$dir...\n"; |
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} |
| 279 |
|
| 280 |
mkdir $bc || die "can't make dir for current backup $bc: $!"; |
| 281 |
|
| 282 |
my @dirs = ( "/" ); |
| 283 |
my @smb_dirs = ( "/" ); |
| 284 |
|
| 285 |
my $transfer = 0; # bytes transfered over network |
| 286 |
|
| 287 |
# this will store all available files and sizes |
| 288 |
my @files; |
| 289 |
my %file_size; |
| 290 |
my %file_atime; |
| 291 |
my %file_mtime; |
| 292 |
#my %file_md5; |
| 293 |
%file_md5 = (); |
| 294 |
|
| 295 |
my @smb_files; |
| 296 |
my %smb_size; |
| 297 |
#my %smb_atime; |
| 298 |
#my %smb_mtime; |
| 299 |
|
| 300 |
sub norm_dir { |
| 301 |
my $foo = shift; |
| 302 |
my $prefix = shift; |
| 303 |
$foo =~ s#//+#/#g; |
| 304 |
$foo =~ s#/+$##g; |
| 305 |
$foo =~ s#^/+##g; |
| 306 |
return $prefix.$foo if ($prefix); |
| 307 |
return $foo; |
| 308 |
} |
| 309 |
|
| 310 |
# read local filesystem |
| 311 |
my $di = 0; |
| 312 |
while ($di <= $#dirs && $real_bl) { |
| 313 |
my $d=$dirs[$di++]; |
| 314 |
opendir(DIR,"$real_bl/$d") || warn "opendir($real_bl/$d): $!\n"; |
| 315 |
|
| 316 |
# read .backupignore if exists |
| 317 |
if (-f "$real_bl/$d/.backupignore") { |
| 318 |
open(I,"$real_bl/$d/.backupignore"); |
| 319 |
while(<I>) { |
| 320 |
chomp; |
| 321 |
push @ignore,norm_dir("$d/$_"); |
| 322 |
} |
| 323 |
close(I); |
| 324 |
#print STDERR "ignore: ",join("|",@ignore),"\n"; |
| 325 |
link "$real_bl/$d/.backupignore","$bc/$d/.backupignore" || |
| 326 |
warn "can't copy $real_bl/$d/.backupignore to current backup dir: $!\n"; |
| 327 |
} |
| 328 |
|
| 329 |
# read .md5sum if exists |
| 330 |
if (-f "$real_bl/$d/.md5sum") { |
| 331 |
open(I,"$real_bl/$d/.md5sum"); |
| 332 |
while(<I>) { |
| 333 |
chomp; |
| 334 |
my ($md5,$f) = split(/\s+/,$_,2); |
| 335 |
$file_md5{$f}=$md5; |
| 336 |
} |
| 337 |
close(I); |
| 338 |
} |
| 339 |
|
| 340 |
my @clutter = readdir(DIR); |
| 341 |
foreach my $f (@clutter) { |
| 342 |
next if ($f eq '.'); |
| 343 |
next if ($f eq '..'); |
| 344 |
my $pr = norm_dir("$d/$f"); # path relative |
| 345 |
my $pf = norm_dir("$d/$f","$real_bl/"); # path full |
| 346 |
if (grep(/^\Q$pr\E$/,@ignore) == 0) { |
| 347 |
if (-f $pf) { |
| 348 |
push @files,$pr; |
| 349 |
$file_size{$pr}=(stat($pf))[7]; |
| 350 |
$file_atime{$pr}=(stat($pf))[8]; |
| 351 |
$file_mtime{$pr}=(stat($pf))[9]; |
| 352 |
} elsif (-d $pf) { |
| 353 |
push @dirs,$pr; |
| 354 |
} else { |
| 355 |
print STDERR "not file or directory: $pf\n"; |
| 356 |
} |
| 357 |
} else { |
| 358 |
print STDERR "ignored: $pr\n"; |
| 359 |
} |
| 360 |
} |
| 361 |
} |
| 362 |
|
| 363 |
# local dir always include / |
| 364 |
xlog($share,($#files+1)." files and ".($#dirs)." dirs on local disk before backup"); |
| 365 |
|
| 366 |
# read smb filesystem |
| 367 |
|
| 368 |
xlog($share,"smb to $share as $param{username}/$param{workgroup}"); |
| 369 |
|
| 370 |
# FIX: how to aviod creation of ~/.smb/smb.conf ? |
| 371 |
$smb = new Filesys::SmbClient(%param) || die "SmbClient :$!\n"; |
| 372 |
|
| 373 |
$di = 0; |
| 374 |
while ($di <= $#smb_dirs) { |
| 375 |
my $d=$smb_dirs[$di]; |
| 376 |
my $pf = norm_dir($d,"smb:$share/"); # path full |
| 377 |
my $D = $smb->opendir($pf); |
| 378 |
if (! $D) { |
| 379 |
xlog($share,"FATAL: $share [$pf]: $!"); |
| 380 |
# remove failing dir |
| 381 |
delete $smb_dirs[$di]; |
| 382 |
return 0; # failed |
| 383 |
} |
| 384 |
$di++; |
| 385 |
|
| 386 |
my @clutter = $smb->readdir_struct($D); |
| 387 |
foreach my $item (@clutter) { |
| 388 |
my $f = $item->[1]; |
| 389 |
next if ($f eq '.'); |
| 390 |
next if ($f eq '..'); |
| 391 |
my $pr = norm_dir("$d/$f"); # path relative |
| 392 |
my $pf = norm_dir("$d/$f","smb:$share/"); # path full |
| 393 |
if (grep(/^\Q$pr\E$/,@ignore) == 0) { |
| 394 |
if ($item->[0] == main::SMBC_FILE) { |
| 395 |
push @smb_files,$pr; |
| 396 |
$smb_size{$pr}=($smb->stat($pf))[7]; |
| 397 |
$smb_atime{$pr}=($smb->stat($pf))[10]; |
| 398 |
$smb_mtime{$pr}=($smb->stat($pf))[11]; |
| 399 |
} elsif ($item->[0] == main::SMBC_DIR) { |
| 400 |
push @smb_dirs,$pr; |
| 401 |
} else { |
| 402 |
print STDERR "not file or directory [",$item->[0],"]: $pf\n"; |
| 403 |
} |
| 404 |
} else { |
| 405 |
print STDERR "smb ignored: $pr\n"; |
| 406 |
} |
| 407 |
} |
| 408 |
} |
| 409 |
|
| 410 |
xlog($share,($#smb_files+1)." files and ".($#smb_dirs)." dirs on remote share"); |
| 411 |
|
| 412 |
# sync dirs |
| 413 |
my $lc = List::Compare->new(\@dirs, \@smb_dirs); |
| 414 |
|
| 415 |
my @dirs2erase = $lc->get_Lonly; |
| 416 |
my @dirs2create = $lc->get_Ronly; |
| 417 |
xlog($share,($#dirs2erase+1)." dirs to erase and ".($#dirs2create+1)." dirs to create"); |
| 418 |
|
| 419 |
# create new dirs |
| 420 |
foreach (sort @smb_dirs) { |
| 421 |
mkdir "$bc/$_" || warn "mkdir $_: $!\n"; |
| 422 |
} |
| 423 |
|
| 424 |
# sync files |
| 425 |
$lc = List::Compare->new(\@files, \@smb_files); |
| 426 |
|
| 427 |
my @files2erase = $lc->get_Lonly; |
| 428 |
my @files2create = $lc->get_Ronly; |
| 429 |
xlog($share,($#files2erase+1)." files to erase and ".($#files2create+1)." files to create"); |
| 430 |
|
| 431 |
sub smb_copy { |
| 432 |
my $smb = shift; |
| 433 |
|
| 434 |
my $from = shift; |
| 435 |
my $to = shift; |
| 436 |
|
| 437 |
|
| 438 |
my $l = 0; |
| 439 |
|
| 440 |
foreach my $f (@_) { |
| 441 |
#print "smb_copy $from/$f -> $to/$f\n"; |
| 442 |
my $md5 = Digest::MD5->new; |
| 443 |
|
| 444 |
my $fd = $smb->open("$from/$f"); |
| 445 |
if (! $fd) { |
| 446 |
xlog("WARNING","can't open smb file $from/$f: $!"); |
| 447 |
next; |
| 448 |
} |
| 449 |
|
| 450 |
if (! open(F,"> $to/$f")) { |
| 451 |
xlog("WARNING","can't open new file $to/$f: $!"); |
| 452 |
next; |
| 453 |
} |
| 454 |
|
| 455 |
while (defined(my $b=$smb->read($fd,4096))) { |
| 456 |
print F $b; |
| 457 |
$l += length($b); |
| 458 |
$md5->add($b); |
| 459 |
} |
| 460 |
|
| 461 |
$smb->close($fd); |
| 462 |
close(F); |
| 463 |
|
| 464 |
$file_md5{$f} = $md5->hexdigest; |
| 465 |
|
| 466 |
# FIX: this fails with -T |
| 467 |
my ($a,$m) = ($smb->stat("$from/$f"))[10,11]; |
| 468 |
utime $a, $m, "$to/$f" || |
| 469 |
warn "can't update utime on $to/$f: $!\n"; |
| 470 |
|
| 471 |
} |
| 472 |
return $l; |
| 473 |
} |
| 474 |
|
| 475 |
# copy new files |
| 476 |
foreach (@files2create) { |
| 477 |
$transfer += smb_copy($smb,"smb:$share",$bc,$_); |
| 478 |
} |
| 479 |
|
| 480 |
my $size_sync = 0; |
| 481 |
my $atime_sync = 0; |
| 482 |
my $mtime_sync = 0; |
| 483 |
my @sync_files; |
| 484 |
my @ln_files; |
| 485 |
|
| 486 |
foreach ($lc->get_intersection) { |
| 487 |
|
| 488 |
my $f; |
| 489 |
|
| 490 |
if ($file_size{$_} != $smb_size{$_}) { |
| 491 |
$f=$_; |
| 492 |
$size_sync++; |
| 493 |
} |
| 494 |
if ($file_atime{$_} != $smb_atime{$_}) { |
| 495 |
$f=$_; |
| 496 |
$atime_sync++; |
| 497 |
} |
| 498 |
if ($file_mtime{$_} != $smb_mtime{$_}) { |
| 499 |
$f=$_; |
| 500 |
$mtime_sync++; |
| 501 |
} |
| 502 |
|
| 503 |
if ($f) { |
| 504 |
push @sync_files, $f; |
| 505 |
} else { |
| 506 |
push @ln_files, $_; |
| 507 |
} |
| 508 |
} |
| 509 |
|
| 510 |
xlog($share,($#sync_files+1)." files will be updated (diff: $size_sync size, $atime_sync atime, $mtime_sync mtime), ".($#ln_files+1)." will be linked."); |
| 511 |
|
| 512 |
foreach (@sync_files) { |
| 513 |
$transfer += smb_copy($smb,"smb:$share",$bc,$_); |
| 514 |
} |
| 515 |
|
| 516 |
xlog($share,"$transfer bytes transfered..."); |
| 517 |
|
| 518 |
foreach (@ln_files) { |
| 519 |
link "$real_bl/$_","$bc/$_" || warn "link $real_bl/$_ -> $bc/$_: $!\n"; |
| 520 |
} |
| 521 |
|
| 522 |
# remove files |
| 523 |
foreach (sort @files2erase) { |
| 524 |
unlink "$bc/$_" || warn "unlink $_: $!\n"; |
| 525 |
delete $file_md5{$_}; |
| 526 |
} |
| 527 |
|
| 528 |
# remove not needed dirs (after files) |
| 529 |
foreach (sort @dirs2erase) { |
| 530 |
rmdir "$bc/$_" || warn "rmdir $_: $!\n"; |
| 531 |
} |
| 532 |
|
| 533 |
# remove old .md5sum |
| 534 |
foreach (sort @dirs) { |
| 535 |
unlink "$bc/$_/.md5sum" if (-e "$bc/$_/.md5sum"); |
| 536 |
} |
| 537 |
|
| 538 |
# erase stale entries in .md5sum |
| 539 |
my @md5_files = keys %file_md5; |
| 540 |
$lc = List::Compare->new(\@md5_files, \@smb_files); |
| 541 |
foreach my $file ($lc->get_Lonly) { |
| 542 |
xlog("NOTICE","removing stale '$file' from .md5sum"); |
| 543 |
delete $file_md5{$file}; |
| 544 |
} |
| 545 |
|
| 546 |
# create .md5sum |
| 547 |
my $last_dir = ''; |
| 548 |
my $md5; |
| 549 |
foreach my $f (sort { $file_md5{$a} cmp $file_md5{$b} } keys %file_md5) { |
| 550 |
my $dir = dirname($f); |
| 551 |
my $file = basename($f); |
| 552 |
#print "$f -- $dir / $file<--\n"; |
| 553 |
if ($dir ne $last_dir) { |
| 554 |
close($md5) if ($md5); |
| 555 |
open($md5, ">> $bc/$dir/.md5sum") || warn "can't create $bc/$dir/.md5sum: $!"; |
| 556 |
$last_dir = $dir; |
| 557 |
#print STDERR "writing $last_dir/.md5sum\n"; |
| 558 |
} |
| 559 |
print $md5 $file_md5{$f}," $file\n"; |
| 560 |
} |
| 561 |
close($md5) if ($md5); |
| 562 |
|
| 563 |
# create leatest link |
| 564 |
#print "ln -s $bc $real_bl\n"; |
| 565 |
if (-l $bl) { |
| 566 |
unlink $bl || warn "can't remove old latest symlink $bl: $!\n"; |
| 567 |
} |
| 568 |
symlink $bc,$bl || warn "can't create latest symlink $bl -> $bc: $!\n"; |
| 569 |
|
| 570 |
# FIX: sanity check -- remove for speedup |
| 571 |
xlog($share,"failed to create latest symlink $bl -> $bc...") if (readlink($bl) ne $bc || ! -l $bl); |
| 572 |
|
| 573 |
xlog($share,"backup completed..."); |
| 574 |
|
| 575 |
return 1; |
| 576 |
} |
| 577 |
__END__ |
| 578 |
#------------------------------------------------------------------------- |
| 579 |
|
| 580 |
|
| 581 |
=head1 NAME |
| 582 |
|
| 583 |
psinib - Perl Snapshot Is Not Incremental Backup |
| 584 |
|
| 585 |
=head1 SYNOPSIS |
| 586 |
|
| 587 |
./psinib.pl |
| 588 |
|
| 589 |
=head1 DESCRIPTION |
| 590 |
|
| 591 |
This script in current version support just backup of Samba (or Micro$oft |
| 592 |
Winblowz) shares to central disk space. Central disk space is organized in |
| 593 |
multiple directories named after: |
| 594 |
|
| 595 |
=over 4 |
| 596 |
|
| 597 |
=item * |
| 598 |
server which is sharing files to be backed up |
| 599 |
|
| 600 |
=item * |
| 601 |
name of share on server |
| 602 |
|
| 603 |
=item * |
| 604 |
dated directory named like standard ISO date format (YYYYMMDD). |
| 605 |
|
| 606 |
=back |
| 607 |
|
| 608 |
In each dated directory you will find I<snapshot> of all files on |
| 609 |
exported share on that particular date. |
| 610 |
|
| 611 |
You can also use symlink I<latest> which will lead you to |
| 612 |
last completed backup. After that you can use some other backup |
| 613 |
software to transfer I<snapshot> to tape, CD-ROM or some other media. |
| 614 |
|
| 615 |
=head2 Design considerations |
| 616 |
|
| 617 |
Since taking of share snapshot every day requires a lot of disk space and |
| 618 |
network bandwidth, B<psinib> uses several techniques to keep disk usage and |
| 619 |
network traffic at acceptable level: |
| 620 |
|
| 621 |
=over 3 |
| 622 |
|
| 623 |
=item - usage of hard-links to provide same files in each snapshot (as opposed |
| 624 |
to have multiple copies of same file) |
| 625 |
|
| 626 |
=item - usage of file size, atime and mtime to find changes of files without |
| 627 |
transferring whole file over network (just share browsing is transfered |
| 628 |
over network) |
| 629 |
|
| 630 |
=item - usage of C<.md5sum> files (compatible with command-line utility |
| 631 |
C<md5sum>) to keep file between snapshots hard-linked |
| 632 |
|
| 633 |
=back |
| 634 |
|
| 635 |
=head1 CONFIGURATION |
| 636 |
|
| 637 |
This section is not yet written. |
| 638 |
|
| 639 |
=head1 HACKS, TRICKS, BUGS and LIMITATIONS |
| 640 |
|
| 641 |
This chapter will have all content that doesn't fit anywhere else. |
| 642 |
|
| 643 |
=head2 Can snapshots be more frequent than daily? |
| 644 |
|
| 645 |
There is not real reason why you can't take snapshot more often than |
| 646 |
once a day. Actually, if you are using B<psinib> to backup Windows |
| 647 |
workstations you already know that they tend to come-and-go during the day |
| 648 |
(reboots probably ;-), so running B<psinib> several times a day increases |
| 649 |
your chance of having up-to-date backup (B<psinib> will not make multiple |
| 650 |
snapshots for same day, nor will it update snapshot for current day if |
| 651 |
it already exists). |
| 652 |
|
| 653 |
However, changing B<psinib> to produce snapshots which are, for example, hourly |
| 654 |
is a simple change of C<$DIR_TIME_FMT> which is currently set to |
| 655 |
C<'%Y%m%d'> (see I<strftime> documentation for explanation of that |
| 656 |
format). If you change that to C<'%Y%m%d-%H> you can have hourly snapshots |
| 657 |
(if your network is fast enough, that is...). Also, some of messages in |
| 658 |
program will sound strange, but other than that it should work. |
| 659 |
I<You have been warned>. |
| 660 |
|
| 661 |
=head2 Do I really need to share every directory which I want to snapshot? |
| 662 |
|
| 663 |
Actually, no. Due to usage of C<Filesys::SmbClient> module, you can also |
| 664 |
specify sub-directory inside your share that you want to backup. This feature |
| 665 |
is most useful if you want to use administrative shares (but, have in mind |
| 666 |
that you have to enter your Win administrator password in unencrypted file on |
| 667 |
disk to do that) like this: |
| 668 |
|
| 669 |
smbmount //server/c$/WinNT/fonts /mnt -o username=administrator%win |
| 670 |
|
| 671 |
After that you will get directories with snapshots like: |
| 672 |
|
| 673 |
server/c_WinNT_fonts/yyyymmdd/.... |
| 674 |
|
| 675 |
=head2 Won't I run out of disk space? |
| 676 |
|
| 677 |
Of course you will... Snapshots and logfiles will eventually fill-up your disk. |
| 678 |
However, you can do two things to stop that: |
| 679 |
|
| 680 |
=head3 Clean snapshort older than x days |
| 681 |
|
| 682 |
You can add following command to your C<root> crontab: |
| 683 |
|
| 684 |
find /backup/isis_backup -type d -mindepth 3 -maxdepth 3 -mtime +11 -exec rm -Rf {} \; |
| 685 |
|
| 686 |
I assume that C</backup/isis_backup> is directory in which are your snapshots |
| 687 |
and that you don't want to keep snapshots older than 11 days (that's |
| 688 |
C<-mtime +11> part of command). |
| 689 |
|
| 690 |
=head3 Rotate your logs |
| 691 |
|
| 692 |
I will leave that to you. I relay on GNU/Debian's C<logrotate> to do it for me. |
| 693 |
|
| 694 |
=head2 What are I<YYYYMMDD.partial> directories? |
| 695 |
|
| 696 |
If there isn't I<latest> symlink in snapshot directory, it's preatty safe to |
| 697 |
assume that previous backup from that day failed. So, that directory will |
| 698 |
be renamed to I<YYYYMMDD.partial> and snapshot will be performed again, |
| 699 |
linking same files (other alternative would be to erase that dir and find |
| 700 |
second-oldest directory, but this seemed like more correct approach). |
| 701 |
|
| 702 |
=head2 I can't connect to any share |
| 703 |
|
| 704 |
Please verify that nmblookup (which is part of samba package) is in /bin or |
| 705 |
/usr/bin. Also verify that nmblookup returns IP address for your server |
| 706 |
using: |
| 707 |
|
| 708 |
$ nmblookup tvhouse |
| 709 |
querying tvhouse on 192.168.34.255 |
| 710 |
192.168.34.30 tvhouse<00> |
| 711 |
|
| 712 |
If you don't get any output, your samba might not listen to correct interface |
| 713 |
(see interfaces in smb.conf). |
| 714 |
|
| 715 |
=head1 AUTHOR |
| 716 |
|
| 717 |
Dobrica Pavlinusic <dpavlin@rot13.org> |
| 718 |
|
| 719 |
L<http://www.rot13.org/~dpavlin/> |
| 720 |
|
| 721 |
=head1 LICENSE |
| 722 |
|
| 723 |
This product is licensed under GNU Public License (GPL) v2 or later. |
| 724 |
|
| 725 |
=cut |
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