12 |
# |
# |
13 |
# |
# |
14 |
# usage: |
# usage: |
15 |
# $ backup.pl mountscript |
# $ psinib.pl mountscript |
16 |
|
|
17 |
use strict 'vars'; |
use strict 'vars'; |
18 |
use Data::Dumper; |
use Data::Dumper; |
22 |
use Filesys::SmbClient; |
use Filesys::SmbClient; |
23 |
#use Taint; |
#use Taint; |
24 |
use Fcntl qw(LOCK_EX LOCK_NB); |
use Fcntl qw(LOCK_EX LOCK_NB); |
25 |
|
use Digest::MD5; |
26 |
|
use File::Basename; |
27 |
|
use Getopt::Long; |
28 |
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|
29 |
# configuration |
# configuration |
30 |
my $LOG_TIME_FMT = '%Y-%m-%d %H:%M:%S'; # strftime format for logfile |
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 |
my $DIR_TIME_FMT = '%Y%m%d'; # strftime format for backup dir |
32 |
|
|
33 |
my $LOG = '/var/log/backup.log'; # add path here... |
my $LOG = '/var/log/backup.log'; # add path here... |
34 |
$LOG = '/tmp/backup.log'; |
#$LOG = '/tmp/backup.log'; |
35 |
|
|
36 |
# store backups in which directory |
# store backups in which directory |
37 |
my $BACKUP_DEST = '/data/isis_backup'; |
my $BACKUP_DEST = '/backup/isis_backup'; |
38 |
|
#my $BACKUP_DEST = '/tmp/backup/'; |
39 |
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|
40 |
# files to ignore in backup |
# files to ignore in backup |
41 |
my @ignore = ('.md5sum', '.backupignore', 'backupignore.txt'); |
my @ignore = ('.md5sum', '.backupignore', 'backupignore.txt'); |
42 |
|
|
43 |
# open log |
# open log |
44 |
open(L, "> $LOG") || die "can't open log $LOG: $!"; |
open(L, ">> $LOG") || die "can't open log $LOG: $!"; |
45 |
select((select(L), $|=1)[0]); # flush output |
select((select(L), $|=1)[0]); # flush output |
46 |
|
|
47 |
# make a lock on logfile |
# make a lock on logfile |
52 |
sleep 1; |
sleep 1; |
53 |
redo if ++$c < 10; |
redo if ++$c < 10; |
54 |
# no response for 10 sec, bail out |
# no response for 10 sec, bail out |
55 |
print STDERR "can't take lock on $LOG -- another $0 running?\n"; |
xlog("ABORT","can't take lock on $LOG -- another $0 running?"); |
56 |
exit 1; |
exit 1; |
57 |
} |
} |
58 |
|
|
59 |
# taint path: nmblookup should be there! |
# taint path: nmblookup should be there! |
60 |
$ENV{'PATH'} = "/usr/bin:/bin"; |
$ENV{'PATH'} = "/usr/bin:/bin"; |
61 |
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|
62 |
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my $use_ping = 1; # deault: use ping to verify that host is up |
63 |
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|
64 |
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my $result = GetOptions( |
65 |
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"ping!" => \$use_ping, "backupdest!" => \$BACKUP_DEST, |
66 |
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); |
67 |
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|
68 |
my $mounts = shift @ARGV || |
my $mounts = shift @ARGV || |
69 |
'mountscript'; |
'mountscript'; |
70 |
# die "usage: $0 mountscript"; |
# die "usage: $0 mountscript"; |
72 |
|
|
73 |
my @in_backup; # shares which are backeduped this run |
my @in_backup; # shares which are backeduped this run |
74 |
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|
75 |
my $p = new Net::Ping->new(); |
my $ping; |
76 |
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if ($use_ping) { |
77 |
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$ping = new Net::Ping->new("tcp", 2); |
78 |
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# ping will try tcp connect to netbios-ssn (139) |
79 |
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$ping->{port_num} = getservbyname("netbios-ssn", "tcp"); |
80 |
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} |
81 |
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|
82 |
my $backup_ok = 0; |
my $backup_ok = 0; |
83 |
|
|
84 |
my $smb; |
my $smb; |
85 |
my %smb_atime; |
my %smb_atime; |
86 |
my %smb_mtime; |
my %smb_mtime; |
87 |
|
my %file_md5; |
88 |
|
|
89 |
open(M, $mounts) || die "can't open $mounts: $!"; |
open(M, $mounts) || die "can't open $mounts: $!"; |
90 |
while(<M>) { |
while(<M>) { |
92 |
next if !/^\s*smbmount\s/; |
next if !/^\s*smbmount\s/; |
93 |
my (undef,$share,undef,$opt) = split(/\s+/,$_,4); |
my (undef,$share,undef,$opt) = split(/\s+/,$_,4); |
94 |
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|
95 |
my ($user,$passwd,$workgroup); |
my ($user,$passwd,$workgroup,$ip); |
96 |
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|
97 |
foreach (split(/,/,$opt)) { |
foreach (split(/,/,$opt)) { |
98 |
my ($n,$v) = split(/=/,$_,2); |
my ($n,$v) = split(/=/,$_,2); |
108 |
} |
} |
109 |
} elsif ($n =~ m#workgroup#i) { |
} elsif ($n =~ m#workgroup#i) { |
110 |
$workgroup = $v; |
$workgroup = $v; |
111 |
|
} elsif ($n =~ m#ip#i) { |
112 |
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$ip = $v; |
113 |
} |
} |
114 |
} |
} |
115 |
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|
116 |
push @in_backup,$share; |
push @in_backup,$share; |
117 |
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118 |
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119 |
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my ($host,$dir,$date_dir) = share2host_dir($share); |
120 |
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my $bl = "$BACKUP_DEST/$host/$dir/latest"; # latest backup |
121 |
|
my $bc = "$BACKUP_DEST/$host/$dir/$date_dir"; # current one |
122 |
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my $real_bl; |
123 |
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if (-l $bl) { |
124 |
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$real_bl=readlink($bl) || die "can't read link $bl: $!"; |
125 |
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$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
126 |
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if (-l $bc && $real_bl eq $bc) { |
127 |
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print "$share allready backuped...\n"; |
128 |
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$backup_ok++; |
129 |
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next; |
130 |
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} |
131 |
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132 |
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} |
133 |
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134 |
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135 |
print "working on $share\n"; |
print "working on $share\n"; |
136 |
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137 |
my $ip = get_ip($share); |
# try to nmblookup IP |
138 |
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$ip = get_ip($share) if (! $ip); |
139 |
|
|
140 |
if ($ip) { |
if ($ip) { |
141 |
xlog($share,"IP is $ip"); |
xlog($share,"IP is $ip"); |
142 |
if ($p->ping($ip)) { |
if (($use_ping && $ping->ping($ip)) || 1) { |
143 |
snap_share($share,$user,$passwd,$workgroup); |
if (snap_share($share,$user,$passwd,$workgroup)) { |
144 |
$backup_ok++; |
$backup_ok++; |
145 |
|
} |
146 |
} |
} |
147 |
} |
} |
148 |
} |
} |
154 |
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|
155 |
#------------------------------------------------------------------------- |
#------------------------------------------------------------------------- |
156 |
|
|
157 |
|
|
158 |
# get IP number from share |
# get IP number from share |
159 |
sub get_ip { |
sub get_ip { |
160 |
my $share = shift; |
my $share = shift; |
167 |
} |
} |
168 |
} |
} |
169 |
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|
170 |
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171 |
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# write entry to screen and log |
172 |
sub xlog { |
sub xlog { |
173 |
my $share = shift; |
my $share = shift; |
174 |
my $t = strftime $LOG_TIME_FMT, localtime; |
my $t = strftime $LOG_TIME_FMT, localtime; |
177 |
print L "$t $share\t$m\n"; |
print L "$t $share\t$m\n"; |
178 |
} |
} |
179 |
|
|
180 |
sub snap_share { |
# dump warn and dies into log |
181 |
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BEGIN { $SIG{'__WARN__'} = sub { xlog('WARN',$_[0]) ; warn $_[0] } } |
182 |
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BEGIN { $SIG{'__DIE__'} = sub { xlog('DIE',$_[0]) ; die $_[0] } } |
183 |
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my $share = shift; |
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my %param = ( debug => 0 ); |
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$param{username} = shift; |
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$param{password} = shift; |
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$param{workgroup} = shift; |
|
184 |
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185 |
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# split share name to host, dir and currnet date dir |
186 |
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sub share2host_dir { |
187 |
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my $share = shift; |
188 |
my ($host,$dir); |
my ($host,$dir); |
189 |
if ($share =~ m#//([^/]+)/(.+)$#) { |
if ($share =~ m#//([^/]+)/(.+)$#) { |
190 |
($host,$dir) = ($1,$2); |
($host,$dir) = ($1,$2); |
195 |
print "Can't parse share $share into host and directory!\n"; |
print "Can't parse share $share into host and directory!\n"; |
196 |
return; |
return; |
197 |
} |
} |
198 |
|
return ($host,$dir,strftime $DIR_TIME_FMT, localtime); |
199 |
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} |
200 |
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|
201 |
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|
202 |
my $date_dir = strftime $DIR_TIME_FMT, localtime; |
# make a snapshot of a share |
203 |
|
sub snap_share { |
204 |
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205 |
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my $share = shift; |
206 |
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207 |
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my %param = ( debug => 0 ); |
208 |
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209 |
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$param{username} = shift || warn "can't find username for share $share"; |
210 |
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$param{password} = shift || warn "can't find passwod for share $share"; |
211 |
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$param{workgroup} = shift || warn "can't find workgroup for share $share"; |
212 |
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|
213 |
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my ($host,$dir,$date_dir) = share2host_dir($share); |
214 |
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|
215 |
# latest backup directory |
# latest backup directory |
216 |
my $bl = "$BACKUP_DEST/$host/$dir/latest"; |
my $bl = "$BACKUP_DEST/$host/$dir/latest"; |
218 |
my $bc = "$BACKUP_DEST/$host/$dir/$date_dir"; |
my $bc = "$BACKUP_DEST/$host/$dir/$date_dir"; |
219 |
|
|
220 |
my $real_bl; |
my $real_bl; |
221 |
if (-e $bl) { |
if (-l $bl) { |
222 |
$real_bl=readlink($bl) || die "can't read link $bl: $!"; |
$real_bl=readlink($bl) || die "can't read link $bl: $!"; |
223 |
$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
224 |
} else { |
} else { |
225 |
print "no old backup, this is first run...\n"; |
print "no old backup, trying to find last backup, "; |
226 |
|
if (opendir(BL_DIR, "$BACKUP_DEST/$host/$dir")) { |
227 |
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my @bl_dirs = sort grep { !/^\./ && -d "$BACKUP_DEST/$host/$dir/$_" } readdir(BL_DIR); |
228 |
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closedir(BL_DIR); |
229 |
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$real_bl=pop @bl_dirs; |
230 |
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print "using $real_bl as latest...\n"; |
231 |
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$real_bl="$BACKUP_DEST/$host/$dir/$real_bl" if (substr($real_bl,0,1) ne "/"); |
232 |
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if ($real_bl eq $bc) { |
233 |
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xlog($share,"latest from today (possible partial backup)"); |
234 |
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rename $real_bl,$real_bl.".partial" || warn "can't reaname partial backup: $!"; |
235 |
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$real_bl .= ".partial"; |
236 |
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} |
237 |
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} else { |
238 |
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print "this is first run...\n"; |
239 |
|
} |
240 |
} |
} |
241 |
|
|
242 |
if (-e $bc && $real_bl && $real_bl eq $bc) { |
if (-l $bc && $real_bl && $real_bl eq $bc) { |
243 |
print "$share allready backuped...\n"; |
print "$share allready backuped...\n"; |
244 |
return; |
return 1; |
245 |
} |
} |
246 |
|
|
247 |
die "You should really create BACKUP_DEST [$BACKUP_DEST] by hand! " if (!-e $BACKUP_DEST); |
die "You should really create BACKUP_DEST [$BACKUP_DEST] by hand! " if (!-e $BACKUP_DEST); |
268 |
my %file_size; |
my %file_size; |
269 |
my %file_atime; |
my %file_atime; |
270 |
my %file_mtime; |
my %file_mtime; |
271 |
my %file_md5; |
#my %file_md5; |
272 |
|
%file_md5 = (); |
273 |
|
|
274 |
my @smb_files; |
my @smb_files; |
275 |
my %smb_size; |
my %smb_size; |
276 |
#my %smb_atime; |
#my %smb_atime; |
277 |
#my %smb_mtime; |
#my %smb_mtime; |
|
my %smb_md5; |
|
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278 |
|
|
279 |
sub norm_dir { |
sub norm_dir { |
280 |
my $foo = shift; |
my $foo = shift; |
290 |
my $di = 0; |
my $di = 0; |
291 |
while ($di <= $#dirs && $real_bl) { |
while ($di <= $#dirs && $real_bl) { |
292 |
my $d=$dirs[$di++]; |
my $d=$dirs[$di++]; |
293 |
opendir(DIR,"$bl/$d") || warn "opendir($bl/$d): $!\n"; |
opendir(DIR,"$real_bl/$d") || warn "opendir($real_bl/$d): $!\n"; |
294 |
|
|
295 |
# read .backupignore if exists |
# read .backupignore if exists |
296 |
if (-f "$bl/$d/.backupignore") { |
if (-f "$real_bl/$d/.backupignore") { |
297 |
open(I,"$bl/$d/.backupignore"); |
open(I,"$real_bl/$d/.backupignore"); |
298 |
while(<I>) { |
while(<I>) { |
299 |
chomp; |
chomp; |
300 |
push @ignore,norm_dir("$d/$_"); |
push @ignore,norm_dir("$d/$_"); |
301 |
} |
} |
302 |
close(I); |
close(I); |
303 |
print STDERR "ignore: ",join("|",@ignore),"\n"; |
#print STDERR "ignore: ",join("|",@ignore),"\n"; |
304 |
link "$bl/$d/.backupignore","$bc/$d/.backupignore" || |
link "$real_bl/$d/.backupignore","$bc/$d/.backupignore" || |
305 |
warn "can't copy $bl/$d/.backupignore to current backup dir: $!\n"; |
warn "can't copy $real_bl/$d/.backupignore to current backup dir: $!\n"; |
306 |
} |
} |
307 |
|
|
308 |
# read .md5sum if exists |
# read .md5sum if exists |
309 |
if (-f "$bl/$d/.md5sum") { |
if (-f "$real_bl/$d/.md5sum") { |
310 |
open(I,"$bl/$d/.md5sum"); |
open(I,"$real_bl/$d/.md5sum"); |
311 |
while(<I>) { |
while(<I>) { |
312 |
chomp; |
chomp; |
313 |
my ($md5,$f) = split(/\s+/,$_,2); |
my ($md5,$f) = split(/\s+/,$_,2); |
321 |
next if ($f eq '.'); |
next if ($f eq '.'); |
322 |
next if ($f eq '..'); |
next if ($f eq '..'); |
323 |
my $pr = norm_dir("$d/$f"); # path relative |
my $pr = norm_dir("$d/$f"); # path relative |
324 |
my $pf = norm_dir("$d/$f","$bl/"); # path full |
my $pf = norm_dir("$d/$f","$real_bl/"); # path full |
325 |
if (grep(/^\Q$pr\E$/,@ignore) == 0) { |
if (grep(/^\Q$pr\E$/,@ignore) == 0) { |
326 |
if (-f $pf) { |
if (-f $pf) { |
327 |
push @files,$pr; |
push @files,$pr; |
331 |
} elsif (-d $pf) { |
} elsif (-d $pf) { |
332 |
push @dirs,$pr; |
push @dirs,$pr; |
333 |
} else { |
} else { |
334 |
print STDERR "unknown type: $pf\n"; |
print STDERR "not file or directory: $pf\n"; |
335 |
} |
} |
336 |
} else { |
} else { |
337 |
print STDERR "ignored: $pr\n"; |
print STDERR "ignored: $pr\n"; |
339 |
} |
} |
340 |
} |
} |
341 |
|
|
342 |
xlog($share,($#files+1)." files and ".($#dirs+1)." dirs on local disk before backup"); |
# local dir always include / |
343 |
|
xlog($share,($#files+1)." files and ".($#dirs)." dirs on local disk before backup"); |
344 |
|
|
345 |
# read smb filesystem |
# read smb filesystem |
346 |
|
|
351 |
|
|
352 |
$di = 0; |
$di = 0; |
353 |
while ($di <= $#smb_dirs) { |
while ($di <= $#smb_dirs) { |
354 |
my $d=$smb_dirs[$di++]; |
my $d=$smb_dirs[$di]; |
355 |
my $pf = norm_dir($d,"smb:$share/"); # path full |
my $pf = norm_dir($d,"smb:$share/"); # path full |
356 |
my $D = $smb->opendir($pf) || warn "smb->opendir($pf): $!\n"; |
my $D = $smb->opendir($pf); |
357 |
|
if (! $D) { |
358 |
|
xlog($share,"FATAL: $share [$pf]: $!"); |
359 |
|
# remove failing dir |
360 |
|
delete $smb_dirs[$di]; |
361 |
|
return 0; # failed |
362 |
|
} |
363 |
|
$di++; |
364 |
|
|
365 |
my @clutter = $smb->readdir_struct($D); |
my @clutter = $smb->readdir_struct($D); |
366 |
foreach my $item (@clutter) { |
foreach my $item (@clutter) { |
378 |
} elsif ($item->[0] == main::SMBC_DIR) { |
} elsif ($item->[0] == main::SMBC_DIR) { |
379 |
push @smb_dirs,$pr; |
push @smb_dirs,$pr; |
380 |
} else { |
} else { |
381 |
print STDERR "unknown type: $pf\n"; |
print STDERR "not file or directory [",$item->[0],"]: $pf\n"; |
382 |
} |
} |
383 |
} else { |
} else { |
384 |
print STDERR "smb ignored: $pr\n"; |
print STDERR "smb ignored: $pr\n"; |
386 |
} |
} |
387 |
} |
} |
388 |
|
|
389 |
xlog($share,($#smb_files+1)." files and ".($#smb_dirs+1)." dirs on remote share"); |
xlog($share,($#smb_files+1)." files and ".($#smb_dirs)." dirs on remote share"); |
390 |
|
|
391 |
# sync dirs |
# sync dirs |
392 |
my $lc = List::Compare->new(\@dirs, \@smb_dirs); |
my $lc = List::Compare->new(\@dirs, \@smb_dirs); |
418 |
|
|
419 |
foreach my $f (@_) { |
foreach my $f (@_) { |
420 |
#print "smb_copy $from/$f -> $to/$f\n"; |
#print "smb_copy $from/$f -> $to/$f\n"; |
421 |
if (! open(F,"> $to/$f")) { |
my $md5 = Digest::MD5->new; |
|
print STDERR "can't open new file $to/$f: $!\n"; |
|
|
next; |
|
|
} |
|
422 |
|
|
423 |
my $fd = $smb->open("$from/$f"); |
my $fd = $smb->open("$from/$f"); |
424 |
if (! $fd) { |
if (! $fd) { |
425 |
print STDERR "can't open smb file $from/$f: $!\n"; |
xlog("WARNING","can't open smb file $from/$f: $!"); |
426 |
|
next; |
427 |
|
} |
428 |
|
|
429 |
|
if (! open(F,"> $to/$f")) { |
430 |
|
xlog("WARNING","can't open new file $to/$f: $!"); |
431 |
next; |
next; |
432 |
} |
} |
433 |
|
|
434 |
while (defined(my $b=$smb->read($fd,4096))) { |
while (defined(my $b=$smb->read($fd,4096))) { |
435 |
print F $b; |
print F $b; |
436 |
$l += length($b); |
$l += length($b); |
437 |
|
$md5->add($b); |
438 |
} |
} |
439 |
|
|
440 |
$smb->close($fd); |
$smb->close($fd); |
441 |
close(F); |
close(F); |
442 |
|
|
443 |
|
$file_md5{$f} = $md5->hexdigest; |
444 |
|
|
445 |
# FIX: this fails with -T |
# FIX: this fails with -T |
446 |
my ($a,$m) = ($smb->stat("$from/$f"))[10,11]; |
my ($a,$m) = ($smb->stat("$from/$f"))[10,11]; |
447 |
utime $a, $m, "$to/$f" || |
utime $a, $m, "$to/$f" || |
495 |
xlog($share,"$transfer bytes transfered..."); |
xlog($share,"$transfer bytes transfered..."); |
496 |
|
|
497 |
foreach (@ln_files) { |
foreach (@ln_files) { |
498 |
link "$bl/$_","$bc/$_" || warn "link $bl/$_ -> $bc/$_: $!\n"; |
link "$real_bl/$_","$bc/$_" || warn "link $real_bl/$_ -> $bc/$_: $!\n"; |
499 |
} |
} |
500 |
|
|
501 |
# remove files |
# remove files |
502 |
foreach (sort @files2erase) { |
foreach (sort @files2erase) { |
503 |
unlink "$bc/$_" || warn "unlink $_: $!\n"; |
unlink "$bc/$_" || warn "unlink $_: $!\n"; |
504 |
|
delete $file_md5{$_}; |
505 |
} |
} |
506 |
|
|
507 |
# remove not needed dirs (after files) |
# remove not needed dirs (after files) |
509 |
rmdir "$bc/$_" || warn "rmdir $_: $!\n"; |
rmdir "$bc/$_" || warn "rmdir $_: $!\n"; |
510 |
} |
} |
511 |
|
|
512 |
|
# remove old .md5sum |
513 |
# FIX: create .md5sum |
foreach (sort @dirs) { |
514 |
|
unlink "$bc/$_/.md5sum" if (-e "$bc/$_/.md5sum"); |
515 |
|
} |
516 |
|
|
517 |
|
# erase stale entries in .md5sum |
518 |
|
my @md5_files = keys %file_md5; |
519 |
|
$lc = List::Compare->new(\@md5_files, \@smb_files); |
520 |
|
foreach my $file ($lc->get_Lonly) { |
521 |
|
xlog("NOTICE","removing stale '$file' from .md5sum"); |
522 |
|
delete $file_md5{$file}; |
523 |
|
} |
524 |
|
|
525 |
|
# create .md5sum |
526 |
|
my $last_dir = ''; |
527 |
|
my $md5; |
528 |
|
foreach my $f (sort { $file_md5{$a} cmp $file_md5{$b} } keys %file_md5) { |
529 |
|
my $dir = dirname($f); |
530 |
|
my $file = basename($f); |
531 |
|
#print "$f -- $dir / $file<--\n"; |
532 |
|
if ($dir ne $last_dir) { |
533 |
|
close($md5) if ($md5); |
534 |
|
open($md5, ">> $bc/$dir/.md5sum") || warn "can't create $bc/$dir/.md5sum: $!"; |
535 |
|
$last_dir = $dir; |
536 |
|
#print STDERR "writing $last_dir/.md5sum\n"; |
537 |
|
} |
538 |
|
print $md5 $file_md5{$f}," $file\n"; |
539 |
|
} |
540 |
|
close($md5) if ($md5); |
541 |
|
|
542 |
# create leatest link |
# create leatest link |
543 |
|
#print "ln -s $bc $real_bl\n"; |
544 |
|
if (-l $bl) { |
545 |
|
unlink $bl || warn "can't remove old latest symlink $bl: $!\n"; |
546 |
|
} |
547 |
symlink $bc,$bl || warn "can't create latest symlink $bl -> $bc: $!\n"; |
symlink $bc,$bl || warn "can't create latest symlink $bl -> $bc: $!\n"; |
548 |
|
|
549 |
|
# FIX: sanity check -- remove for speedup |
550 |
|
xlog($share,"failed to create latest symlink $bl -> $bc...") if (readlink($bl) ne $bc || ! -l $bl); |
551 |
|
|
552 |
xlog($share,"backup completed..."); |
xlog($share,"backup completed..."); |
|
} |
|
553 |
|
|
554 |
|
return 1; |
555 |
|
} |
556 |
|
__END__ |
557 |
#------------------------------------------------------------------------- |
#------------------------------------------------------------------------- |
558 |
|
|
559 |
|
|
560 |
|
=head1 NAME |
561 |
|
|
562 |
|
psinib - Perl Snapshot Is Not Incremental Backup |
563 |
|
|
564 |
|
=head1 SYNOPSIS |
565 |
|
|
566 |
|
./psinib.pl |
567 |
|
|
568 |
|
=head1 DESCRIPTION |
569 |
|
|
570 |
|
This script in current version support just backup of Samba (or Micro$oft |
571 |
|
Winblowz) shares to central disk space. Central disk space is organized in |
572 |
|
multiple directories named after: |
573 |
|
|
574 |
|
=over 4 |
575 |
|
|
576 |
|
=item * |
577 |
|
server which is sharing files to be backed up |
578 |
|
|
579 |
|
=item * |
580 |
|
name of share on server |
581 |
|
|
582 |
|
=item * |
583 |
|
dated directory named like standard ISO date format (YYYYMMDD). |
584 |
|
|
585 |
|
=back |
586 |
|
|
587 |
|
In each dated directory you will find I<snapshot> of all files on |
588 |
|
exported share on that particular date. |
589 |
|
|
590 |
|
You can also use symlink I<latest> which will lead you to |
591 |
|
last completed backup. After that you can use some other backup |
592 |
|
software to transfer I<snapshot> to tape, CD-ROM or some other media. |
593 |
|
|
594 |
|
=head2 Design considerations |
595 |
|
|
596 |
|
Since taking of share snapshot every day requires a lot of disk space and |
597 |
|
network bandwidth, B<psinib> uses several techniques to keep disk usage and |
598 |
|
network traffic at acceptable level: |
599 |
|
|
600 |
|
=over 3 |
601 |
|
|
602 |
|
=item - usage of hard-links to provide same files in each snapshot (as opposed |
603 |
|
to have multiple copies of same file) |
604 |
|
|
605 |
|
=item - usage of file size, atime and mtime to find changes of files without |
606 |
|
transferring whole file over network (just share browsing is transfered |
607 |
|
over network) |
608 |
|
|
609 |
|
=item - usage of C<.md5sum> files (compatible with command-line utility |
610 |
|
C<md5sum>) to keep file between snapshots hard-linked |
611 |
|
|
612 |
|
=back |
613 |
|
|
614 |
|
=head1 CONFIGURATION |
615 |
|
|
616 |
|
This section is not yet written. |
617 |
|
|
618 |
|
=head1 HACKS, TRICKS, BUGS and LIMITATIONS |
619 |
|
|
620 |
|
This chapter will have all content that doesn't fit anywhere else. |
621 |
|
|
622 |
|
=head2 Can snapshots be more frequent than daily? |
623 |
|
|
624 |
|
There is not real reason why you can't take snapshot more often than |
625 |
|
once a day. Actually, if you are using B<psinib> to backup Windows |
626 |
|
workstations you already know that they tend to come-and-go during the day |
627 |
|
(reboots probably ;-), so running B<psinib> several times a day increases |
628 |
|
your chance of having up-to-date backup (B<psinib> will not make multiple |
629 |
|
snapshots for same day, nor will it update snapshot for current day if |
630 |
|
it already exists). |
631 |
|
|
632 |
|
However, changing B<psinib> to produce snapshots which are, for example, hourly |
633 |
|
is a simple change of C<$DIR_TIME_FMT> which is currently set to |
634 |
|
C<'%Y%m%d'> (see I<strftime> documentation for explanation of that |
635 |
|
format). If you change that to C<'%Y%m%d-%H> you can have hourly snapshots |
636 |
|
(if your network is fast enough, that is...). Also, some of messages in |
637 |
|
program will sound strange, but other than that it should work. |
638 |
|
I<You have been warned>. |
639 |
|
|
640 |
|
=head2 Do I really need to share every directory which I want to snapshot? |
641 |
|
|
642 |
|
Actually, no. Due to usage of C<Filesys::SmbClient> module, you can also |
643 |
|
specify sub-directory inside your share that you want to backup. This feature |
644 |
|
is most useful if you want to use administrative shares (but, have in mind |
645 |
|
that you have to enter your Win administrator password in unencrypted file on |
646 |
|
disk to do that) like this: |
647 |
|
|
648 |
|
smbmount //server/c$/WinNT/fonts /mnt -o username=administrator%win |
649 |
|
|
650 |
|
After that you will get directories with snapshots like: |
651 |
|
|
652 |
|
server/c_WinNT_fonts/yyyymmdd/.... |
653 |
|
|
654 |
|
=head2 Won't I run out of disk space? |
655 |
|
|
656 |
|
Of course you will... Snapshots and logfiles will eventually fill-up your disk. |
657 |
|
However, you can do two things to stop that: |
658 |
|
|
659 |
|
=head3 Clean snapshort older than x days |
660 |
|
|
661 |
|
You can add following command to your C<root> crontab: |
662 |
|
|
663 |
|
find /backup/isis_backup -type d -mindepth 3 -maxdepth 3 -mtime +11 -exec rm -Rf {} \; |
664 |
|
|
665 |
|
I assume that C</backup/isis_backup> is directory in which are your snapshots |
666 |
|
and that you don't want to keep snapshots older than 11 days (that's |
667 |
|
C<-mtime +11> part of command). |
668 |
|
|
669 |
|
=head3 Rotate your logs |
670 |
|
|
671 |
|
I will leave that to you. I relay on GNU/Debian's C<logrotate> to do it for me. |
672 |
|
|
673 |
|
=head2 What are I<YYYYMMDD.partial> directories? |
674 |
|
|
675 |
|
If there isn't I<latest> symlink in snapshot directory, it's preatty safe to |
676 |
|
assume that previous backup from that day failed. So, that directory will |
677 |
|
be renamed to I<YYYYMMDD.partial> and snapshot will be performed again, |
678 |
|
linking same files (other alternative would be to erase that dir and find |
679 |
|
second-oldest directory, but this seemed like more correct approach). |
680 |
|
|
681 |
|
=head1 AUTHOR |
682 |
|
|
683 |
|
Dobrica Pavlinusic <dpavlin@rot13.org> |
684 |
|
|
685 |
|
L<http://www.rot13.org/~dpavlin/> |
686 |
|
|
687 |
|
=head1 LICENSE |
688 |
|
|
689 |
|
This product is licensed under GNU Public License (GPL) v2 or later. |
690 |
|
|
691 |
|
=cut |