On Tue, 13 Jan 2009, Nick Silkey wrote:

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> Robert Hajime Lanning wrote:
>> On Tue, 2009-01-13 at 17:03 +0800, Atom Powers wrote:
>>> What are the other strategies for making a service highly available?
>>
>> Have you looked into LVS?
>> http://www.linuxvirtualserver.org/
>>
>> Combine that with Linux Hearbeat (http://www.linux-ha.org/) and you get
>> a full load balanced HA cluster.
>
> I second the LVS recommendation.  Its a great layer-4 load-balancing
> function.  Code was merged into the Linux kernel several years back;
> very stable IME/IMHO.  There are quote a few projects (Ultra Monkey,
> keepalived, etc) which have wrappers for LVS functions to test service
> viability for HA.  Great solution for those who cannot afford turnkey
> appliances (F5, Foundry, Netscaler, etc) or prefer the DIY approach.
>
> There is also the CARP project in *BSD land.  Unfortunately, the UCARP
> project to bring this to Linux has been stalled off-and-on for years.
> YMMV now.

my understanding of CARP is that it is basicly the same thing that is 
called CLUSTERIP on the linux side. it is well supported by linux-ha

David Lang
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