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This article is all about configuring Varnish optimally for these high-availability setups, in which multiple dedicated back-end servers are protected from heavy traffic by Varnish serving cached content to the outside world. We also have some neat tricks for server maintenance, optimizing your cached content, and configuring Varnish to act as a fail-safe even if all of your back-end servers go down. Includes information on Varnish Grace mode.

Information on Varnish Grace and Saint modes. "A key feature of Varnish is its ability to shield you from misbehaving web- and application servers."