On 5 Feb 2007, at 20:29, Conor Daly wrote:
>> This is an area where I basically have no clue. I have an RHEL box
> that
> runs an ftp server to receive incoming files. I don't necessarily
> have
> control of the upstream suppliers so I need to have something there
> at all
> times to catch incoming files.
> In the course of considering failover possibilities, I note that
> something
> that manages to detect the hung machine would not be able to take
> over the
> task since the hung machine's ip address would be still in use.
Nothing you can do with DNS that I know of. I don't know what you
have in the way of available IPs or budget for hardware is, but one
option would be to use a managed Layer 4-7 switch of some sort.
Basically you'd assign your virtual FTP IP to the switch would would
load balance and NAT to the real server(s). These devices can as far
as I know check for the accessibility of a port on a given IP and
route/switch accordingly. I'd imagine it's quite pricey kit though.
See http://en.wikipedia.org/wiki/Multilayer_switch
Cheers,
Daniel
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