[plug] Uninterupted service network

[Jeff Williams]

Thanks guys, your info lead me to the High Availability Linux Project, 
 http://linux-ha.org/, which is a weath of useful info.

Jeff

Hook wrote:

>Grahame Bowland wrote:
>
>On Saturday 12 October 2002 11:54, Jeff Williams wrote:
>  
>
>>I was wanting to setup up a network where:
>>
>>All of the servers (www, mail, sql) and their backups are machines on a
>>192.168.0.* network.
>>All of the DNS entries for the servers point to the outside address of
>>the router for the 192.168.0.* network, and the router
>>uses NAT to send the data to the appropriate server.
>>In the event of a server down the router routes data to the backup
>>server, util the master comes back up again.
>>
>>Now, I don't have a problem with setting up the above, but I what
>>happens if the router dies? I was wanting any failures to be covered
>>without manual intervention, but I can't think how you can go to a
>>backup router. Is there a solution, or am I heading in the wrong
>>    
>>
>direction?
>
>Use two Ciscos with HSRP running and the load balancing code.
>
>Or, use two Linux boxen running heartbeat for the external IP address.
>Heartbeat can run over serial, UDP or multicast and I've used it
>successfully. Route the traffic to the heartbeat address and put loadsharing
>stuff into both the linux routers.
>
>One gotcha with heartbeat: edit /etc/ha.d/resources/if-up or whatever and
>make
>sure it does "ifconfig eth0:0 0" rather than "ifconfig eth0:0 down", or your
>eth0 will keep mysteriously vanishing :) This is fixed in the newer Debian
>packages though.
>
>
>Or you could download a package called 'keepalive.d" which, when coupled
>with the LVS kernel patches effectively runs HSRP on 2 or more Linux servers
>allowing failover.  It's *not* load-balancing though.
>
>The Hooker
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