Re: Load Balancing

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.
Received on Tue Apr 11 2000 - 20:38:25 MDT