HA PROXY is open spurce and works pretty well. Also you can do load balance based on HAS URL if you want.<br><br><br><div class="gmail_quote">On Fri, Jan 15, 2010 at 3:09 PM, Bendik Heltne <span dir="ltr"><<a href="mailto:bheltne@gmail.com">bheltne@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">> A couple more questions:<br>
><br>
> (1) Are they any good strategies for splitting load across Varnish<br>
> front-ends? Or is the common practice to have just one Varnish server?<br>
<br>
We have 3 servers. A bit overkill, but then we have redundancy even if<br>
one fail. I guess 2 is the minimum option if you have an important<br>
site and 99,5% uptime guarantee.<br>
<br>
> (2) How do people avoid single-point-of-failure for Varnish? Do people<br>
> run Varnish on two servers, amassing similar local caches, but put<br>
> something in front of the two Varnishes? Or round-robin-DNS?<br>
<br>
We use a loadbalancer from F5 called BigIP. It's no exactly free, but<br>
there are free alternatives that will probably do much of the basic<br>
stuff:<br>
<a href="http://lcic.org/load_balancing.html" target="_blank">http://lcic.org/load_balancing.html</a><br>
<br>
- Bendik<br>
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</blockquote></div><br>