topic automatic failover in Operating System - Linux

automatic failover

Daniel Ubeda — Thu, 27 Mar 2003 15:43:28 GMT

Hi,

I want to use a linux like a failover "router".
I have two NT servers with an application. Both are identicals, but one are more powerfull than the other.
I want to create with linux, an failover that in case of failure in one NT, switch the tcp traffic to another NT.
Are there any soft that fullfil this function ???

thanks

Re: automatic failover

Michael Steele_2 — Thu, 27 Mar 2003 18:24:37 GMT

That's what the floating ip address is all about in the package. During failover the ip address migrates to the other node as does the application package. So the destination of the TCP traffic is still the floating IP and not the fixed IP's of either node. In short, you have two fixed ips assigned, one to each NT server, and one dynamic ip assigned to the application package.

But bear in mind that TCP is not a connectionless IP protocol like UDP is. Unlike UDP, which is connectionless, everything will be dropped in a TCP connection upon failover.

Also a clustering agent is O/S specific since the clustering binary files interact with the O/S drivers and these drivers will be specific to each O/S. So in this case an NT clustering failover utility is indicated.

Here's one:

http://www.networkcomputing.com/1103/1103f3.html

And here's one about Linux:

http://linux-ha.org/

There are web applications like apache that will load balance ip traffic. Here is one link about it:

http://httpd.apache.org/docs/vhosts/name-based.html

Re: automatic failover

Daniel Ubeda — Thu, 27 Mar 2003 18:34:06 GMT

Yes, I know that NT cluster is the solution, but we need W2k advanced server to do this and we have w2k server ... is a cost balance ...
We want make with linux a switch that recognize the the failure of one NT and send the ip trafic to another NT ...

thanks

Re: automatic failover

U.SivaKumar_2 — Fri, 28 Mar 2003 11:31:53 GMT

Hi,

I suggest these.

http://www.linuxvirtualserver.org
http://www.ultramonkey.org

regards,
U.SivaKumar