I'm succesfully using lvs in director mode to load balance and provide ha for multiple varnish caches. It works really well. On Dec 7, 2011 5:36 a.m., "Allan Wind" <[email protected]> wrote:
> On 2011-12-07 00:05:24, Alejandro wrote: > > Hi guys, > > > > I need your advice... I'm using varnish into multiple server, some for > > caching dynamic content and other only for static content. > > > > On front of the Dynamic Content Varnish y have Cisco ACE Load balancer, > but > > on front of the Static Varnish, the traffic is much higher and can't use > > Cisco ACE, for this reason I'm using RoundRobin DNS into this 2 servers. > > > > This week I had, some network issue with one of this servers and when the > > network go down I loose 50% of the traffic... > > > > here my question, or advice request... How I can have HA with 2 varnish > > server? I'm thinking on Heartbeat or Heartbeat+ldirectord, please fell > free > > to send your suggestions. > > As your clients do not fall back to the 2nd IP it means you need > one (active/passive) or two vips (active/active) that can be > shared between your two varnish servers. > > If you have cachable dynamic content then your two Varnish > instances may return different content to the same client. This > may or may not be an issue. Others will have to weight in if > cache invalidation of Varnish entries is a doable strategy > (if you cannot set your expiration headers correctly). On the > positive side you have a warm cache should one of your Varnish > instances fail. With a active/passive fail over the cold cache > may be problematic. > > That said I am surprised that you think Varnish will be able to > handle your traffic but a pair of load balancers cannot. If the > Cisco ACE is not up to it have you looked at haproxy? You still > have the same vip issues, but load balancers are stateless and > give you persistence connections to minimize differences between > Varnish instances. > > > /Allan > -- > Allan Wind > Life Integrity, LLC > <http://lifeintegrity.com> > > _______________________________________________ > varnish-misc mailing list > [email protected] > https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >
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