2011/12/15 Jeppe Toustrup <[email protected]>
> Hi
>
> I have downloaded the v2rc1 release today, and tried to play around with
> it a bit.
>
> What I plan on configuring is failover for a HTTP and HTTPS website, and
> if/when that site is down for maintenance, the clients should be directed
> to another server which shows a website telling that the site in question
> is down for maintenance.
>
> Is this possible to configure in ZLB?
>
You can't select something similar on GUI, but If you have to maintenance
all your backends on the same time you can obtain the same result if you
personalize your HTTP messages errors, with some HTML web.
It will be implemented on new releases.
Like a workaround: If you have to maintenance only one backend on your
farm, YOu can modify the backend port on the farm configuration.
>
>
> I can't see any way to specify the algorithm for the real servers when I
> choose to set up a HTTP/HTTPS farm, and my understanding is the default
> algorithm will load balance incoming requests between the available
> servers, taking their weight into account. I am thinking that perhaps
> setting a very large weight for one server and a low one for the other may
> create something like what I want, but I don't think I can make sure the
> clients wont hit the "down for maintenance" server while the primary server
> is up.
>
By default HTTP/HTTPS works with weight algorithm (the same weight for all
backends) more information about this on web documentation:
http://www.zenloadbalancer.com/doc/ZenLB%20administration%20guide.html#__RefHeading__643_521824990
"By contrast with the TCP or UDP farms profile, the HTTP/HTTPS profile use
a weight algorithm implicitly."
> If I set up a TCP farm instead, I don't think it will be possible to see
> the client IP address on the backend servers, which is required for this
> application. Please correct me if I am wrong here.
>
It isn't possible on any profile, zen at the moment works in sNAT method,
backends only know the load balancer IP
>
>
> --
> Best regards
>
> Jeppe Toustrup
>
>
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10 Tips for Better Server Consolidation
Server virtualization is being driven by many needs.
But none more important than the need to reduce IT complexity
while improving strategic productivity. Learn More!
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