Re: Load Balancing

L4 switch ???? but why does Win2K doesnt need L4 switch ? it can
loadbalance automagically ? but personally , i hate Windoz serverz!

On Wed, 12 Apr 2000, fooler wrote:

> Henrik Nordstrom wrote:
>
> > John Reilly wrote:
> >
> > > I have a small problem here - I am trying to use squid to act
> > > as a load balancer to a number of http servers, i.e. www.blah.com
> > > is squid which does a redirect to www1.blah.com or www2.blah.com
> >
> > If you doesn't need "true" load-balancing but round-robin is fine, then
> > create a DNS/host record listing all the IP addresses and accelerate to
> > this DNS/host entry.
> >
> > If you need "true" load balancing then you need a redirector which knows
> > how to make the distribution.
> >
> > > I setup 2 virtual interfaces on www which the redirector script re-writes IP addresses to www1 and www2 hostnames in the URLs.
> > >
> > > setting are:
> > > httpd_accel_host virtual
> > > httpd_accel_port 80
> >
> > This is not for load balancing. It is for accelerating several IP-based
> > servers in case there are old clients not sending the Host: header.
> >
> > What this can do for you is to send any request arriwing on IP
> > 192.168.0.1 to www1.example.com and request arriwing on IP 192.168.0.2
> > to www2.example.com.
> >
> > If you only have one single "server" (visible host name un the URL) then
> > httpd_accel_host virtual" is defenitely not what you want.
> >
> > Try this setup:
> >
> > 1. Build Squid using dnsserver
> > (./configure --disable-internal-dns for Squid-2.3, Default for Squid-2.2
> > and earlier)
> >
> > 2. Add all the "real" IP addresses for www.example.com to your
> > /etc/hosts file
> > 192.168.0.1 www.example.com
> > 192.168.0.2 www.example.com
> >
> > 3. Change /etc/nsswitch.conf to prefer files over DNS
> > hosts: files dns
> >
> > 4. Configure squid with
> > httpd_accel_host www.example.com
> > httpd_accel_port 80
> >
> > This will distribute the requests using round-robin on the
> > www.example.com IP addresses listed in /etc/hosts on the proxy server.
> >
> > If you need another load distribution than round-robin, then you must
> > use a redirector process which implements this distribution.
> >
> > --
> > Henrik Nordstrom
> > Squid hacker
>
> get a L4 switch for load balancing. if you cant afford to buy that, you can go to http://www.linuxvirtualserver.org/ for other
> alternatives.
>
> fooler.
>

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