I’m
assuming the BigIP will be setup to do session-based balancing. So basically you have an external
interface visable to the global internet… this IP would be the IP that clients
would connect to. The internal
interfaces would hit your servers.
When somebody first tries to reach the website, the BigIP (or any other
session-based load balancer) creates a ‘tunnel’ for that entire session, and ‘tunnels’
that clients request to the same box until that session disappears.
-----Original
Message-----
From: Shinta Tjio
[mailto:[EMAIL PROTECTED]]
Sent: Monday, March 19, 2001 11:35
AM
To:
'[EMAIL PROTECTED]'
Cc: '[EMAIL PROTECTED]';
Tim Sullivan; [EMAIL PROTECTED]
Subject: RE: Re[2]: Using
Apache/Tomcat in high-traffic site
We are also in the process of setting an
environment like this.
I'm curious about your comment in the first paragraph.
Assuming the environment is: the
loadbalancer is load balancing
Apache, there are many Apache running mod_jk, the mod_jk is
loadbalancing many Tomcat behind the Apache.
I'm not familiar with BigIP, Steve, does
it forward requests
of the same sessions to the same Apache?
If your loadbalancer can't be configured
to send requests
of the same sessions to the same Apache (Gavin's first question),
I don't think mod_jk will solve this. Unless you want to just
have one Apache, and let it be the "load balancer"
essentially.
Which of course, in our environment, this is not a scalable
solution.
shinta
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> Sent: Monday, March 19, 2001 5:36 AM
> To: '[EMAIL PROTECTED]'; Tim Sullivan;
> [EMAIL PROTECTED]
> Subject: Re[2]: Using Apache/Tomcat in high-traffic site
>
>
> I'm just putting together a
prototype on the Internet using Tomcat,
> we've got two Linux boxes and
load is spread over the two hosts using
> a BigIP load-balancer. The
mod_jk config is ok when you understand
> whats going on, local and
remote Tomcat instances aren't specially
> distinguished apart from having
a different IP address. mod_jk handles
> the sticky session part so
going in on different web servers each time
> is fine.
>
> mod_jk could do with better
documentation in this regard and its very
> easy to configure it so that it
does absolutely nothing and logs no
> errors whatsoever ! Direct all
contexts to the load balancer worker
> not the ajp13 workers and have
the load balancer worker spread things
> out.
>
> I'm interested in your
experience of heap sizes, in my prototype I've
> ignored it, how would I know if
I'm near - do you have a feel for how
> much memory you need per
session (assuming application doesn't store
> much data in the session).
>
> SteveQ.
>
>
> ______________________________ Reply Separator
> _________________________________
> Subject: RE: Using Apache/Tomcat in high-traffic site
> Author: Tim Sullivan <[EMAIL PROTECTED]> at
Internet-po
> Date: 16/03/01 11:24
>
>
>
> Hello Gavin,
>
> I am considering doing the same thing on almost the same
> hardware (e4500 +
> e10000).
>
> Did you end up finding any performance examples or otherwise
> for this? If
> so, could you forward it my way?
>
> Thanks in advance,
>
> -Tim
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]
>
> Sent: Wednesday, March 14, 2001 12:55 PM
> To: [EMAIL PROTECTED]
> Subject: Using
Apache/Tomcat in high-traffic site
>
>
>
>
> Hi,
>
> I am looking to use Apache and Tomcat in my company's
> production web site.
> Before I can convince management that this is a good idea I
need some
> information so I am confident. If anyone can help I'll
be
> very grateful.
>
>
> First of all I'll give you a picture of the overall
> architecture that I want
> to
> create:
>
> 1) For fault-tolerance and scaleability we want to have
> several instances
> of
> Apache running over a number of machines. These will be
load
> balanced by a
> pair
> of Cisco Local Director boxes, because we already own a
> couple of them.
> From a
> brief look through the operating manual on Cisco's web site I
get the
> impression
> that Local Director cannot support "sticky"
load-balancing.
> Please correct
> me
> if I'm wrong.
>
> 2) We will run several instances of Tomcat (version
3.2.1
> most likely) on
> our
> back-end servers. These are a couple of Sun E10000s
with 32
> processors
> each.
> These are partitioned up into domains, so that we end up with
> 12 processors
> on
> each machine dedicated to running Tomcat. Each domain
has
> 2GB of RAM.
> There
> are other domains dedicated to databases, etc...
>
> 3) Each instance of Apache will be using mod_jk in a
> "sticky" load-balanced
> configuration. Every instance of Apache (and so mod_jk)
will
> have workers
> defined for every instance of Tomcat on both E10000s.
In
> other words, a
> Tomcat
> instance may receive a request from any instance of Apache.
>
>
> The things I need to know :)
>
> 1) Each request to our site will be assigned seemingly
at
> random to one of
> the
> Apache instances by the Cisco boxes. Can the
"sticky" part
> of mod_jk cope
> with
> this? i.e. Will mod_jk pass the request to the
correct
> Tomcat instance
> even
> though it does not share context information with the other
Apache
> instances?
>
> 2) What is the best way of running Tomcat on the large
> E10000s? Should I
> have
> just a few very large processes (say 2 x 800MB max heap) for
> Tomcat or
> should I
> run many smaller processes (say 16 x 100MB max heap)?
Has
> anyone got any
> experience with making Tomcat (or any Java based server)
> scale to machines
> of
> this size and power? I want to get good performance,
but I
> don't want to
> compromise stability.
>
> 3) Has anyone used Tomcat in a mission critical
environment?
> I use it in
> development all the time and I'm very happy with it, but I'd
> like to get
> some
> impression of how it holds up.
>
> 4) Are there any security considerations with this
> configuration? We have
> firewalls, intrusion detection kit, etc... for which we have
> a dedicated
> maintenance team. I'm really only interested in the
software
> here. Has
> anyone
> used the new Java 2 security features with Tomcat?
>
>
> Thank you very much indeed!
>
> Cheerio, Woody.
>
>
>
>
>
>
>
_________________________________________________________________
>
> Internet communications are not secure. This message is
> confidential to the
> addressee. Any copying or distribution of it by anyone
without the
> addressee's
> consent may be unlawful. If you are not the intended
> addressee, please
> inform
> us immediately and then delete this message.
>
> Virginmoney Limited is regulated by the Personal Investment
> Authority for
> investment business only. Virginmoney Limited is registered
with the
> Mortgage
> Code Compliance Board and is a member of the General
> Insurance Standards
> Council.
>
> Virginmoney Limited's registered office: Discovery House,
> Whiting Road,
> Norwich, NR4 6EJ. Registered in England no. 3427512.
>
_________________________________________________________________
>
>
---------------------------------------------------------------------
> To unsubscribe, e-mail:
[EMAIL PROTECTED]
> For additional commands, email:
[EMAIL PROTECTED]
>
