Just in case there is any problem and I can't do things myself

 * change apache configuration files on ippc01-ippc10: '''DONE'''

At 8pm:
 * check if jt scripts are still running on ippc19: make them asleep
 * make sure ippdb02 is synchronized with ippdb00, stop slave on ippb02
 * restart apache servers on ippc01-ippc10
 * wake up jt scripts: if crashed, tell jt
 * start nebulous mysqldump on ippdb00 (use pbzip2)

Once neb dump is finished:
 * copy reference dump to ippdb02 (and from ippdb02 to ipp001)
 * delete nebulous database on ippdb00
 * stop the mysql server
 * clean mysql on ippdb00 (remove old binlogs, move and compress mysql logs)
 * start the mysql server
 * ingest neb dump on ippdb00
 * write down new master coordinates

Once ingestion is finished:
 * restore apache configuration files on ippc01-ippc10 (backup files are called /etc/apache2/modules.d/apache2-mod_perl-startup.pl.20120529_ippdb00)
 * restart apache servers (jt scripts should be finished?!)
 * restart ipp
 * delete neb dump on ippdb00

Once everything seems fine, *** on ippb02 ***:
 * comment neb dump in root crontab
 * delete nebulous database
 * stop the mysql server
 * clean mysql (remove old binlogs, move and compress mysql logs)
 * start the mysql server
 * ingest neb dump
 * set master coordinates
 * start slave
 * activate neb dump in root crontab
 * delete neb dump