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Hi Horms,
> Perhaps we should come up with a list of features that LVS doesn't have,
> then work out which ones need/should be implemented.
>
During half a year I was working with lot of customers
having all the crazy ideas about what a loadbalancer
should do (filling up the fridge, if there is no beer
anymore). Some of them were extremely constructive and
I tried to implement some of them into a user space tool
which I'm still improving but is also already running on
various sites around Switzerland :)
Here is a (wish)-list of features/ideas (unsorted)
Most of them concern web-loadbalancing:
o masq table copier: in case of a failover most of
already established connections with persistency
would still work without the need to reauthenticate.
o session limitation: I already did something into
this direction, but only scripting, but it works
quite good.
o more 'intelligent' loadbalancing algorithms (cfp)
o statistics: currently you could install an snmpd
and add into some unused mib-tables the data like
echo -e `expr $(ipchains -L -M -n | grep RIP | \
wc -l) - 1`"\c"
get it via snmpget, pipe it into mrtg from my
friend tobias (www.ee.ethz.ch/~oetiker/webtools/mrtg)
or rrdtool and plot some nice graphs.
o I personally don't like it, but content based
loadbalancing, cookie-support for ssl-connections.
o I also implemented the LIP-feature :) which means
that a customer can put a lowlevel machine as a
server of last ressort (LastIP) in case every
webserver is being taken out by some healthcheck,
every traffic is redirected to this LIP or spare
server where the client would see a page like
"currently down, please come back later"
If one server is inserted back, either because
his amount of sessions fall below a lower thresh-
hold, or because the healthcheck doesn't fail
anymore, the customer is automatically being
redirected to this server. How did I do this?
Well configure every server with their appropriate
weight and add the LIP with weight 0, write a
more or less intelligent tool to hadle the logic
and off you go. Works perfect for me and currently
for 4 major sites.
o your idea,
o see the list at www.linuxvirtualserver.org
Regards,
Roberto Nibali, ratz
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