Date: Fri, 5 Mar 1999 13:36:24 +0100 From: Philippe Regnauld <none@regnauld--deepo.prosa.dk.lh.bsd-dk.dk> To: bsd-dk@hotel.prosa.dk Subject: Re: Load Balancing
Søren Klintrup writes:
> Er det muligt at køre Load Balancing på FreeBSD ???
>
> Jeg ved at det kører fint på Windows NT (skal bare lege lidt i registry :) - og vil nu gerne prøve det på FreeBSD ...
See end.
> Derudover .. hvad siger FreeBSD til SMP dvs. mere end 1 processor... jeg overvejer at købe et gammelt ASUS SMP board til std. Pentium processor ... mest for at lege med det - men det er jo ik så fedt hvis FreeBSD ik ka bruge det :) ...
Mine to hjemme maskiner er rock stable (one 2xPPro-200, one 2xP5-133).
Date: Sun, 7 Feb 1999 19:42:31 +0100
From: Bernd Eckenfels <none@ecki--lina.inka.de.lh.bsd-dk.dk>
To: ff-announce@lina.inka.de
Subject: [ff] The Freefire Bulletin #4 (1999-02-07) Newsletter
Message-ID: <none@19990207194231.A2156--calista.inka.de.lh.bsd-dk.dk>
The Freefire Bulletin #4 (1999-02-07) Newsletter
The Freefire Project tries to help Developers in building Firewall and
IT-Security Solutions based on Free Tools. You can find additional
information about the Project at the Homepage
<URL:http://sites.inka.de/lina/freefire-l/index.en.html>
0 Executive Info (Ec)
---------------------
1 High Availability (HA) with Open Source (Ec)
Mission critical applications
2 Linux-HA HOWTO (hm)
Harald Milz talks about the Project
3 fake (Ec)
A network superserver with additional features
4 Eddie & Erlang/OTP (Ec)
Server Farms and distributed network applications
5 FreeQualizer (Ec)
Not realy a free tool - Load Balancer for FreeBSD
6 Misc (Ec)
ONE-IP Project, GFS, Linux Virtual Server and the Linux NAT Page
7 Other Freefire News (Ec)
New Drawbridge 3.0, Juniper now Open Source
1 High Availabiltiy with Open Source
------------------------------------
Open Source solutions - for firewalls or to secure important Servers -
getting more and more common. Companies have realized that external support
isnt always the better solution (compared to inhouse know how and Open
Source). As the tasks get bigger and bigger more vital parts of a company
depend on Open Source systems (By Definition a firewall has to control all
external network traffic). Therefore it is time to add support for HA to
Free Systems. The most important points for HA are reducing single points of
failure (SPOF) and fault tolerant software.
Therefore the main focus of this bulletin is on HA solutions.
<URL:http://www.inka.de/sites/lina/freefire-l/index.en.htm>
2 Linux-HA HOWTO/Project (hm)
------------------------------
In today's commercial Unix marketplace, High Availability (HA) is key to
selling server solutions. Virtually every Unix supplier has their own HA
software solution to provide customers with near-fault-tolerant server
systems at moderate prices. As a rule of thumb, redundancy is used to
prevent the overall IT system from having single points of failure, a method
that has been common in space flight and general aviation for decades. The
common objective is to mask unplanned outages from users in a manner to let
users continue to work quickly.
Unplanned outages can severely hamper your operations. Two 1995 studies by
Oracle Corp. and Datamation showed that average businesses lost between
80,000 and 350,000 USD per hour of unplanned outages. After the 1993 World
Trade Center bombing, 145 of 350 businesses which were located in the
building had to close down within a year because they had no redundant IT
structure.
That being said, and keeping in mind that Linux starts conquering commercial
data centers and business critical use, it is clear that Linux needs its
High Availability solution(s) as every other Unix.
<URL:http://sunsite.unc.edu/pub/Linux/ALPHA/linux-ha/High-Availability-HOWTO.html/>
3 fake (Ho)
------------
Fake has been designed to switch in backup servers on a LAN. It has been
used to success to switch in backup Mail, Web and Proxy servers during
periods of both unscheduled and scheduled down time. Fake allows you to take
over the IP address of another machine in the LAN by bringing up an
additional interface and making use of ARP spoofing. The additional
interface can be either a physical interface or an IP alias.
<URL:http://linux.zipworld.com.au/fake/>
4 Eddiware & Erlang/OTP
------------------------
Eddie is a toolkit for bulding HA Server farms. It comes with 4 components:
IP Migration, Load-Balancing DNS, Intelligent HTTP Gateway and Content
Replication. Those Aplications are bult on Ericssons Erlang/OTP System. A
Open Source Programming Language/Runtime-Environment for distributed HA
Solutions. Erlang proofed its usefullness in serveral big telecommunication
Projects of Ericsson. Based on Erlang it should be trivial to develop
Application level Proxies (which instantly support distributed operation).
Thanks to the Erlang/OTP Crew for their helpfull responses. The Erlang/OTP
System is abvailable in binary for Linux, Solaris, Windows and FreeBSD but
should run on any vanilla Unix, too.
<URL:http://www.erlang.org/>
<URL:http://www.eddieware.org/>
<URL:http://www.ericsson.se:800/cslab/>
5 FreeQualizer (Ec)
-------------------
Additional High Availability Software for FreeBSD is for example FreeQualizer, a Free
(non-source) Load Balacer for 2 nodes.
<URL:http://www.coyotepoint.com/freequalizer.shtml>
6 Misc (Ec)
-----------
The ONE-IP Project is research in progress based on an experimental *BSD
Implementation. Two different approaches are made to have multiple servers
respond to th same address. Looks like a promising idea. Especially the
Broadcast-Based Dispatching looks like a god solution to the SPOF problem
with current load-balancing server.
<URL:http://http://www.research.att.com/~ymwang/papers/HTML/ONE-IP/S.html>
A lot more usefull information on Load Balancing and Adress Rewriting can be
found on the Linux Address Translation Page from Linas Vepstas.
<URL:http://http://www.linas.org/linux/load.html>
Interesting work is going on in the GFS Project. Shared SCSI Filesystem is
a good step towards Linux Clusters for HA Solutions
<URL:http://gfs.lcse.umn.edu>
The LinuxDirector is a Load Balancing Tool included in the Linux Virtual
Server Package.
<URL:http://proxy.iinchina.net/~wensong/ippfvs/>
7 Other Freefire News
---------------------
Russel Nepper announced Drawbridge 3.0. Its running on FreeBSD and
supporting Filtering of bridged Data.
<URL:http://drawbridge.tamu.edu>
Obtuse Systems Corporation has announced an Open Source Version of the Juniper Firewall
Toolkit. This is a major step towards a complete and free Firewall Solution
based on existing tools.
<URL:http://www.obtuse.com/open_source/>
Authors of the current issue
----------------------------
Ec - Bernd 'eckes' Eckenfels <none@ecki--lina.inka.de.lh.bsd-dk.dk>
hm - Harald Milz <none@hm--seneca.muc.de.lh.bsd-dk.dk>
Ho - Horms <none@horms--verge.ing.to.lh.bsd-dk.dk>
(c) Copyright 1999 Bernd Eckenfels and others
Bernd Eckenfels <none@ecki--lina.inka.de.lh.bsd-dk.dk>, GERMANY
------- End of forwarded message -------
--
-[ Philippe Regnauld / Sysadmin ]-
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