Re: [Zope] load-balancing recommendations ? (configuration and hardware)
>>> chas wrote > I've often heard about the infinite-scalability that will > be created by something like ZEO and I've always wondered > about one thing : how is the load-balancing being done ? There's a number of approaches you can take here: 1. Buy something - a cisco localdirector, an arrowpoint (also now owned by cisco), or similar. This is the approach we take - in a past life I've seen an LD get the absolute crap kicked out of it and it just kept working (it was in front of some _large_ proxy caches). www.cisco.com www.arrowpoint.com 2. Software - there's linux virtual server, there's eddieware, there's probably a bunch of commercial packages as well, although I don't know why you'd bother... www.linuxvirtualserver.org www.eddieware.org Which of these solutions you go for largely depends on your budget - the first set of options are probably more robust and flexible, but the latter is definately going to be cheaper :) Anthony -- Anthony Baxter <[EMAIL PROTECTED]> It's never too late to have a happy childhood. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] load-balancing recommendations ? (configuration and hardware)
+[ chas ]- | | | ps. In the past I've got around this by ensuring that if the | very first request from a given browser is dealt with by, say, | server silo8.domain.com, then all subsequent requests from that | browser are also dealt with by by that server. But that | (a) introduces head-aches with application logic and (b) is | not good if silo8.domain.com suddenly goes down. pps. If you use sessions that are not distributed (i.e. in memory), this is the setup you need. It is a royal pain (thinking IIS + ASP here more than anything) -- Totally Holistic Enterprises Internet| P:+61 7 3870 0066 | Andrew Milton The Internet (Aust) Pty Ltd | F:+61 7 3870 4477 | ACN: 082 081 472 | M:+61 416 022 411 | Carpe Daemon PO Box 837 Indooroopilly QLD 4068|[EMAIL PROTECTED]| ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] load-balancing recommendations ? (configuration and hardware)
Hi Folks, I've often heard about the infinite-scalability that will be created by something like ZEO and I've always wondered about one thing : how is the load-balancing being done ? Just say we have 3 front-line servers (ZSERVER_1, ZSERVER_2 and ZSERVER_3 in the diagram below), each running Zope with identical application logic replicated by ZEO (or simply copied across manually); the front-line servers all use the same database (DB) for storing sessions. Our load-balancer distributes incoming requests between the 3 servers : +---[ZSERVER_1]+ | | REQUEST-->[LOADBALANCER]+---[ZSERVER_2]+--[DB] | | +---[ZSERVER_3]+ What are people using for the load-balancer (and I'm looking for real load-balancing, not DNS round-robbin) so that the multiple front-line servers appear as one big server... ie. so that they are transparent to the outside world. In particular, so that cookies set by any one of the front line servers will be shared by the others. (ie. they can not have different fully-qualified domain names or else cookies set by one will not be shared by another). Does anybody with experience have any recommendations for the load-balancer ? Thank you very much, chas ps. In the past I've got around this by ensuring that if the very first request from a given browser is dealt with by, say, server silo8.domain.com, then all subsequent requests from that browser are also dealt with by by that server. But that (a) introduces head-aches with application logic and (b) is not good if silo8.domain.com suddenly goes down. ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
