[BlueOnyx:08255] Blue Onyx Web Load Balanced Cluster with Coyote E350

[Michael Tadros]

Hi There:
I am in the design stages of a web cluster (four servers) with one backend
server  to handle administrative tasks such as email & ftp and a second
server as a fall back email server.   There will be four separate DNS
servers running.  (10 servers total).

As such I envision web traffic (PORT 80) coming in to the Coyote Point E350
Load Balanced Switch and then going through a round robin request to one of
the four servers.

COYOTE---->SERVER1/2/3/4


I think I have devised a script using CMUexport to export the sites /
database from the backend webserver to the individual load balanced servers.
The script is as follows:


#!/bin/bash
#
# migrate_backup - backup web site data for deployment onto a running server
#
# Copyright (C) 2011 Mike Tadros
#
echo Clearing old site data...
rm -rf  /home/migrate/www.abc.org
#
echo Stopping sendmail service...
/etc/rc.d/init.d/sendmail stop
#
echo Backing Up Site Data...
/usr/sbin/cmuExport -d /home/migrate/www.abc.org
#
echo Restarting sendmail service...
/etc/rc.d/init.d/sendmail start



The tarball would then be placed in a shared directory that the four other
servers would be able to access.

After the tarball is then created, the user or cron job would run a modified
CMU script as follows on each individual server:


#!/bin/bash
#
# migrate_restore - deploy a migration onto a running server
#
# Copyright (C) 2011 Mike Tadros
# Change IP to server internal IP
export myip="192.168.1.2"
#
# First test to see if the migrate directory is mounted
# if not, do a mountall
#
if [ ! -d /mnt/migrate/www.abc.org ];
 then mount -a
fi
#
# Now, see if the migrate_backup flag is newer than the local svr restore
flag,
# or the local flag doesn't exist as of yet (1st run)
#
if ( [ ! -e /var/local/migrate_flag ] || [ /mnt/migrate/last_backup_flag -nt
/var/local/migrate_flag ] );
 then echo "Migrating in New Site Data" ;
      /usr/sbin/cmuMerge -d /mnt/migrate/www.abc.org -i $myip ;
      touch /var/local/migrate_flag ;
# else echo "Not Migrating Site Data - Up To Date" ;
fi



The Load Balanced Switch would have the public IP along with the main
backend server.  The backend server public IP that is shared ith load
balanced switch would then be commented out from /etc/initd/eth0:1 so that
when the web traffic comes in from the router.

Question of the day,  does someone on the list know of a more efficient way
of doing this?   Thanks for your help  - Mike



Sincerely yours;



Mike Tadros

Antenna Systems & Solutions, Inc.

931 Albion Avenue

Schaumburg, Illinois 60193-4550

United States of America

Phone: +1-847-584-1000   Fax: +1-847-584-9951

www.antennasystems.com <http://www.antennasystems.com/>
<http://www.antennasystems.com/%3E>



email: mike at antennasystems.com





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