[mapguide-dev] Session Affinity RFC

[Chris Claydon]

I like your suggestions, Tom. This approach would allow a user to hook
up a load balancer without changing any configuration at the web tier
level. Having the web tier connect to a site server that it is not
configured to know about seems a little strange, but I don't think that
it poses a security risk - you can only connect to a server if the
session you need exists on it. So you wouldn't be able to make an
unauthorized connection.

 

I don't think anyone would want to operate Studio (or Web Studio)
through a load-balanced environment. You'd always want to make your
changes on a specific site. Imposing the same restriction for the admin
pages seems fair also.

 

Chris.

 

  _____  

From: Tom Fukushima 
Sent: November 17, 2006 1:32 PM
To: dev at mapguide.osgeo.org
Subject: RE: [mapguide-dev] Session Affinity RFC

 

Hi Chris,

 

I was reading over this with the intent of motioning it for approval,
but thought of the following.

 

The RFC says that the list of available site servers will be listed in
the web tier config file so that the web tier can do some rudimentary
load balancing.  But since the load balancer is already doing this, I
don't think that it is necessary for the web tier to do it again.  With
this in mind, I think that we can simplify things a little more:

1) Each Web Tier only knows about 1 site server (as it is today) and if
a request that doesn't have a session (e.g., request to create a
session) comes to it, the request goes to the web tier's site server
(like it does today).

2) If a request with a session comes in, the Web Tier uses the IP
embedded in the session ID to route the request.  Note that the IP does
not have to be registered in the config file of that web tier.

3) In order to bring up the server admin pages, we only support going
directly to a particular web tier.  We do not support going through the
load balancer.

4) In order to author using Studio or Web Studio, we only support going
directly to a particular web tier.  We do not support going through the
load balancer.

 

Points 3 and 4 above are to make things easier in case it might be tough
to do them. (I don't see Studio mentioned in the RFC.)

 

Cheers

Tom

 

  _____  

From: Chris Claydon 
Sent: Wednesday, November 01, 2006 3:47 PM
To: dev at mapguide.osgeo.org
Subject: [mapguide-dev] Session Affinity RFC

I have just posted a draft of the RFC for "Session Affinity" in MGOS to
the following location:

 

http://wiki.osgeo.org/index.php/MG_RFC_3_-_Session_Affinity

 

Please take a look, and post any feedback to this group.

 

Thank you,

 

Chris Claydon.

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