Can anyone tell me how to take Disaster Recovery in RHEL 5.
Please send any kind of tip or proccess.
Hello,
Disaster is a general term that, at server management end, is
presumably used mostly for backup and preparing yourself to get through
an untoward incident if possibly occur. Most of the GNU/Linux systems,
including RHEL 5, offers same tools for that (except few, and usage may
differ).
To get started, lets consider you have in mind, natural calamities,
physical damage to the server, system failure, and external attacks.
SYSTEM FAILURE:
* This problem can be addressed by using distributed approach. You
can follow this guide to set up a cluster
http://www.ram.org/computing/linux/linux_cluster.html
* Say you have 10 servers, then if 1 goes down, 9 will get slightly
more load but the whole system won't go down.
EXTERNAL ATTACKS:
* External attacks can be of kind, Active attacks(like flooding,
cracking etc) and passive attacks(like SQLInjection etc). All of them
has different approach for prevention.
* You may want to use some firewall like Shorewall etc to prevent
yourself from Active attacks, and use a robust server application that
handles passive attacks at runtime.
* Apart from that, viruses worms etc also appear that may creep into
your data, but since you are running RHEL its most likely secure, still
its not a dead sure!
PHYSICAL DAMAGE:
* Physical damage can be as funny as, someone cut the power cable to
someone completely broken the server so as to take an old revenge ;-)
* For this you may want to keep the server in a secure location and
away from the reach of your enemies. :D
NATURAL CALAMITIES:
* Like earthquake, floods, tsunami!!! Then its the RAID that comes
into picture. Create a complete mirror of your server at a completely
different geolocation. This minimizes the chance as natural calamities
seldom occur at two geolocations simultaneously.
With regards
--
Shamail Tayyab
Blog: http://shamail.in/blog
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