RE: Failover IP router


-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-
bounces@xxxxxxxxxx] On Behalf Of Tom Greaser
Sent: Sunday, December 02, 2007 5:20 AM
To: redhat-list@xxxxxxxxxx
Subject: Re: Failover IP router

Sorry if ived missed any posts and someone has already posted this
but have you looked at BalanceNG. It seems to offer what your wanting
plus you can run both web servers at once.. no wasted resources just
running waiting to be used.


El Martes, 27 de Noviembre de 2007 22:15, Steven Buehler escribi≤:
I have been googleing for this, but can't seem to find the right
answer.
What I am trying to do is to create a failover router on a redhat
box.
1. website.com will be on 2 servers
2. website.com has one IP address
3. redhat box router will have the 1 IP address for website.com on
it.
4. website.com server1 will be on 192.168.1.10
5. website.com server2 will be on 192.168.1.11
6. If website.com server1 fails, website.com server2 will take
over.

We are not worried about cookies that have been set on server1 to be
moved
to server2. We are just worried about the second machine taking
over.
What would be better is if it could be a load balancing setup so that
it
will use both servers, but if one fails, people will not notice it
because
the other server will then be taking all of the requests.

I have googled for "Linux failover iptables router" and a few other
combinations of words, but what I keep finding is failover for the
outbound
connections. Having 3 Nic cards 1 going to one ISP, 1 going to
another ISP
and one going to the internal network. Maybe I am just using the
wrong
wording. Any url links for instructions would be appreciated.

Thank You

Why not installing LVS+Keepalive for instance?
I had the same scenario some months ago (aside from the fact that
cookies were
importatn, but keepalived did the trick with that)

If you need any help either woth LVS or Keepalive, let me know or let
this
list know.

Hope this helps
Manuel.

--
Manuel Arostegui Ramirez.

Electronic Mail is not secure, may not be read every day, and should
not
be used for urgent or sensitive issues.


There was a lot of help, but almost all went toward RedHat Cluster Suite. I tried to get that running with no luck. My boss was also trying to find a solution and ran across a couple of programs. "Pen" and "vrrpd" which were very easy to setup and doesn't require a 3rd box for the router. The combination is called " The Ultimate Cheapskate Cluster". Pen is for load balancing and will transfer people to the correct server if one of the other servers is down. Vrrpd is used as a failover router. Multiple servers run vrrpd in front of "Pen" using the same external IP address. If one of the servers goes down, the other server takes over the use of that external IP.
Both programs are free and very fast to setup compared to other options. We were in a crunch for time and couldn't get an appliance ordered, shipped and setup in time for our deadline this Monday. I believe that a couple of appliances will work better in the future, but for the demo and testing, this was perfect. vrrpd works as a failover router and if money matters, the it is the way to go so that you don't have one point of failure like you would if you ran just ONE appliance in front of the machines.
http://siag.nu/pen/vrrpd-linux2.shtml

Thanks to all
Steve


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