These contributions are appreciated, especially if someone can use them.
But anytime you send something like this to a list or put it on the web,
it's a very good idea to state the license terms in the script, or at least
in the accompanying message. Unless you release your work into the public
domain or under an open license, some people may hesitate to use it and may
not know whether or not they can re-distribute your work, and if so under
what conditions.
I recommend http://www.gnu.org/licenses/licenses.html :-)
Cheers, Stephen
--
Stephen Joyce
Systems Administrator P A N I C
Physics & Astronomy Department Physics & Astronomy
University of North Carolina at Chapel Hill Network Infrastructure
voice: (919) 962-7214 and Computing
fax: (919) 962-0480 http://www.panic.unc.edu
Don't judge a book by its movie.
On Fri, 8 Feb 2008, Marcel Koopmans wrote:
Well as we are giving away scripting for replication...
This script works *without* configuration and maybe people can learn from
it.
Just run it on volservers and don't forget to get your AFStoken first.
repl_afs.pl
------
#!/usr/bin/perl -w
#
# OpenAFS volume replication
# by : Marcel D.A. Koopmans of Elysium Open Systems
#
# version : 1.0.5 ( 2007-08-24 20:25 GMT+1 )
use strict;
use Sys::Syslog;
sub write_log {
my ( ${level}, ${message} ) = @_;
openlog( "afs_repl", "", "DAEMON" );
syslog( ${level}, ${message} ."\n" );
closelog;
}
sub main {
my ${err}=0;
my ( $a, $b );
my @temp;
my ( @ip_a, %ip_h );
my ( %hn_h );
my ( $volume, $sites, $host );
my ( ${exitcode} );
# log start
write_log( "INFO", "OpenAFS replication start" );
# get local IP addresses
open ( FILE, "/sbin/ifconfig -a |" );
while ( <FILE> ) {
chomp($_);
if ( $_=~ m/^\s+inet\s+addr:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)\s+.*$/ ) {
if ( ! exists ( ${ip_h{$1}} ) ) {
${ip_h{$1}}=1;
${ip_a[$#{ip_a}+1]}=$1;
}
}
}
close ( FILE );
# sort IP addresses;
@[EMAIL PROTECTED];
@ip_a=sort(@temp);
$#temp=-1;
# resolve hostnames
if ( $#{ip_a} > -1 ) {
for ( $a=0; $a<=$#{ip_a}; $a++ ) {
open ( FILE, "/usr/bin/getent hosts " . ${ip_a[$a]} . " |" );
while ( <FILE> ) {
chomp($_);
@temp=split(/\s+/,$_);
for ( $b=0; $b<=$#temp; $b++ ) {
if ( ! exists ( ${hn_h{$temp[$b]}} ) ) {
${hn_h{$temp[$b]}}=1;
}
}
}
close ( FILE );
}
}
# Get openAFS volumes
$a=-1;
open ( FILE, "/usr/bin/vos listvldb 2> /dev/null |" );
while ( <FILE> ) {
chomp($_);
$_=~ s/\s+$//;
if ( ( $a == 2 ) && ( $_=~
m/^\s+server\s+(.+)\s+partition\s+\/vicep[a-z]+\s+RW\s+Site$/ ) ) {
${host}=$1;
if ( exists ( $hn_h{$host} ) ) {
if ( ${sites} > 1 ) {
${exitcode}=system("/usr/bin/vos release " . ${volume} . " >
/dev/null 2>&1" );
${exitcode}=${exitcode} / 256;
if ( ${exitcode} == 0 ) {
write_log( "INFO", "release of volume " . ${volume} . "
success" );
} else {
write_log( "ERR", "release of volume " . ${volume} . " failed,
returned exit code " . ${exitcode} );
}
}
}
}
if ( ( $a == 1 ) && ( $_=~
m/^\s+number\s+of\s+sites\s+\-\>\s+([0-9]+)$/ ) ) {
$a=2; # sites
${sites}=$1;
}
if ( ( $a == 0 ) && ( $_=~ m/^(.+)$/ ) ) {
$a=1; # volume name
${volume}=$1;
}
if ( $_=~ m/^$/ ) {
$a=0; # new block
}
}
close ( FILE );
# log end
write_log( "INFO", "OpenAFS replication end" );
}
exit ( main );
------
With kind regards,
Marcel
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Adam Megacz
Sent: 07 February 2008 19:22
To: [email protected]
Cc: [EMAIL PROTECTED]
Subject: [OpenAFS] byte-level incremental backups using "full+reverse
delta"
In case anybody else finds this useful, I've worked out a system for
doing backups of an AFS volume-set with the "full and reverse delta"
style of incremental backups.
/afs/megacz.com/srv/bin/dump.sh
Much like rdiff-backup, this keeps a complete copy of the most recent
backup, and stores all previous backups as deltas against the
*following* backup (ie in the "reverse" direction). This means you
can "truncate" the backup history whenever you like, rather than only
at full-backup intervals, and there's never any reason to keep more
than a single "full" backup around.
Deltas are done with xdelta3. Although it is very CPU-intensive, it
seems to be very good at representing minor changes (ie a few bytes)
to very large files, which "incremental dumps" cannot do, and which
(in my experience) rdiff did not do as well as I would like. A "test
restore" of each delta is done before deleting the old volume, so you
don't need to trust that the xdelta3 algorithm is correct -- you just
have to trust it that it is deterministic.
Hope you find this useful,
- a
#!/bin/bash -e
# A script for "full and backward diff" style incremental backups of
# one or more cells' AFS dumpfiles using xdelta3 for diffing. Note
# that xdelta3 will efficiently represent minor changes to very large
# files, which AFS "incremental dumps" cannot do.
#
# IMPORTANT: you must use xdelta3 version SVN.227 or later -- this
# will become release 3.0u at some point. There is a precompiled x86
# deb at /afs/megacz.com/debian/xdelta3/xdelta3_svn227.deb
#
# Change these variables to suit your needs. Note:
# - Backups are kept in $BACKUPDIR/year/month/day/cell/vol.afsdump.
# - At all times the latest backup is kept in "full" form, and all
# previous backups are kept as "reverse diffs" against the backup
# from the day AFTER them. This lets you easily "truncate" the
# backup history at any time.
# - The symlink $BACKUPDIR/yesterday points to yesterday's backups, if
# there were any; upon completion of today's backups, yesterday's
# will be converted into reverse diffs.
BACKUPDIR=/vol/dumps
LOGFILE=/var/log/dump.log
exec 2>&1
exec &> LOGFILE
mkdir -p $BACKUPDIR
cd $BACKUPDIR
DIR=`date +%Y/%m/%d`
mkdir -p $DIR
rm -f today
ln -fs $DIR today
dump() {
CELL=$1
VOL=$2
OLD=yesterday/$CELL/$VOL.afsdump
NEW=today/$CELL/$VOL.afsdump
aklog -c $CELL
mkdir -p today/$CELL
echo
"===========================================================================
==="
echo "dumping $VOL in cell $CELL..."
echo
tokens
vos examine $VOL -cell $CELL
echo
if test -e $OLD
then \
vos dump $VOL -file $NEW -clone -cell $CELL
xdelta3 -evfs $NEW $OLD $OLD.rev-xdelta || true
((xdelta3 -dcvfs $NEW $OLD.rev-xdelta | cmp - $OLD) && (echo
'removing...'; rm $OLD)) || true
else \
vos dump $VOL -file $NEW -clone -cell $CELL
fi
echo " done dumping $VOL."
}
# each command below is in the form "dump <cellname> <volumename>"
dump megacz.com pub
dump megacz.com srv
dump megacz.com web
dump megacz.com mail
dump megacz.com work
dump megacz.com user
dump megacz.com user.megacz
dump megacz.com root.cell
dump research.cs.berkeley.edu root.cell
# update the "yesterday" symlink so tomorrow's backups will deltify todays'
rm -f yesterday
mv today yesterday
############################################################################
##
# old rdiff-based code; please ignore
############################################################################
##
#
# rdiff delta $OLD.sig $NEW $OLD.fwd
# rdiff patch $OLD $OLD.fwd $NEW
# rm $OLD.fwd
#
# test -e $OLD.sig || rdiff signature $OLD $OLD.sig
# vos dump $VOL -clone -cell $CELL \
# | tee $NEW \
# | (rdiff -- signature - - \
# | tee $NEW.sig \
# | rdiff -- delta - $OLD - \
# | (tee $OLD.rev \
# | rdiff -- patch $NEW - - \
# | (cmp $OLD - && (echo "removing old dump..."; rm -f $OLD))))
# rm -f $OLD.sig
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