Linux Redundancy

I am having one Linux box that functional as firewall, internet gateway, DNS server, http server and database server. I was just wondering is any way i can provide second server on the same subnet to be redundancy of first server, but still rely on the same database it provides initially or should I setup a shared database in this case because viruses always attacked from our LAN (yes, our huge LAN) to our first gateway and everything might be in the risk of failing functional.

or any topology you recommand? I am planning to install a stand alone firewall in transparent mode so it will avoid the virus to direct contact to our gateway. However sever redundancy is still important for backup purpose.

 
johntsai90Asked:
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wesly_chenCommented:
Hi,

> provide second server on the same subnet to be redundancy of first server
I think you are also talking about fail-over.
The heartbeat will do the fail over in case your main server goes down but you also need to keep your data in sync:
http://www.linux-ha.org/download/GettingStarted.html

For data redunctancy, DRBD:
http://www.linux-mag.com/2003-11/drbd_01.html

However, those will take some time to set up and fully test.

Regards,

Wesly
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johntsai90Author Commented:
Hi,

i am having two IBM servers with kernal 2.2 or 2.3 version. Can that be worked?

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wesly_chenCommented:
> kernal 2.2 or 2.3
Are you sure? Linux kernel 2.3 is the test version.
Can you do "uname -r" to verify the kernel version?

Wesly
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johntsai90Author Commented:
yup, i think you are right, both are 2.2 at this point.

Thanks, will look into these document for a while.
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