Re: Ultra Monkey load balancing configuration problems -- please help.

Thank you for your reply.

> The entire purpose of ldirectord is to monitor the health of real servers.
> It is important to choose a level of check that suits your needs. Just
> changing the check type to make sure the cluster works usually glosses
> over the fact that ldirectord is reporting that your real server is not
> functioning correctly. There is a description of the different check

You are right -- my service did not handle properly simple connect
checks. I changed that, then put back in the checktype=connect and it
worked. It allowed me to kill servers and still get the response
either form the remaining ones, or from the director. Thanks for the
hint.

> At this stage ldirectord does not support plugging in custom checks as
> modules (someone did send me a patch, but I think I might have lost it :(
> Instead you will need to modify ldirectord (which is written in perl) to
> add your check. This is quite easy, look at the check_http() subroutine
> for an example of how to implemente a check.

O.K. For now connect is good for me, so no need yet to write a more complex one.

> >> > 2) Another question: I want my real servers to listen on different
> > The question was if it is possible to use different ports for services
> > on real servers. As I said, it is possible with LVS ipvsadm manual
> > set-up. There must be something in the ldirectord script that enforces
> > the same port number.
>
> It is only possible to use portmaping in conjunction with NAT.
> This is a restriction of LVS and is enforced by the kernel.

O.K., thanks for clarifying this.

Two more questions, if you do not mind -- I highly appreciate taking
your time to answer.

1) I am interested in setting up a two tier configuration, where the
requests are balanced between two directors and then, within each
director, to the corresponding real servers. I am in the process of
reading the active-active paper. Would the software coming along the
paper answer this question? At a glance, it seems it would. Could I
still have my own services instead of standard ones?

2) I am also interested in custom routing with LVS (i.e. Level > 4,
based on request content). So far I came across KTCPVS from the LVS
people and Ultra Monkey-L7. They seem to be both level 7 load
balancers. How do they compare (w.r.t. major features). There is not
much english documentation on the UM-L7 site -- does it come with the
distribution?

Many thanks,
Roxana.


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