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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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+ <TITLE> [Nel] server architecture (front end, load balancing, login service, ....)</TITLE>
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+ <H1>[Nel] server architecture (front end, load balancing, login service, ....)</H1>
+ <B>Vianney Lecroart</B>
+ <A HREF="mailto:lecroart%40nevrax.com"
+ TITLE="[Nel] server architecture (front end, load balancing, login service, ....)">lecroart@nevrax.com</A><BR>
+ <I>Mon, 17 Dec 2001 15:22:30 +0100</I>
+ <P><UL>
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+<!--beginarticle-->
+<PRE>Hi nico,
+
+&gt;<i> I've got a little question about the architecture of the server side.
+</I>&gt;<i> If I don't make mistake a shard is composed of N front ends and behind
+</I>&gt;<i> front ends there is some computers running different services.
+</I>&gt;<i> And some where there is a login service (one per shard or one for all
+</I>shard
+&gt;<i> ?)
+</I>
+Shard is composed of services. There are front end services and back end
+services.
+Client are connected with on front end service and front end services are
+connected with back end services.
+There's only one login service for all shards. The client first connects to
+the login service that checks the validity of the account, after the client
+choose the shard. The login service warn the shard (via welcome service (one
+per shard)) that a new client will come. The welcome service chooses the
+best front end for the client and sends the choosen front end to the login
+service and the login service sends this info to the client. after, the
+client connects to the selected front end and authenticates.
+
+&gt;<i> But how clients are balanced between the N front ends of a shard ?
+</I>
+For now, the welcome service does a dumb balancement (try to have the same
+player number on each front end).
+
+&gt;<i> It will be done by a generic load balancer (hardware)
+</I>&gt;<i> or a specific service from NEL ?
+</I>
+It s the welcome service that do that.
+
+&gt;<i> The source code of the load balancer and the front end are delivered with
+</I>&gt;<i> NEL ?
+</I>
+Look the welcome service :-)
+
+&gt;<i> If there a description of all NEL services ?
+</I>
+Look the net part of <A HREF="http://www.nevrax.org/docs/">http://www.nevrax.org/docs/</A>
+And also try here <A HREF="http://www.nevrax.org/docs/doxygen/nel/pages.html">http://www.nevrax.org/docs/doxygen/nel/pages.html</A>
+
+Vianney Lecroart
+---
+lead network programmer / nevrax.com
+icq#: 6870415
+homepage: <A HREF="http://ace.planet-d.net">http://ace.planet-d.net</A>
+www.geekcode.com: GCS/E d- s+++: a-- C+++$ UL++ P- L+++&gt;+$ E+&gt;- W++ N+ o? K-
+w++$ O- M- V- PS- PE? Y PGP t 5? X+ R- tv++ b- DI D+ G e++ h+ r-- y?
+
+
+
+
+</pre>
+
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