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Five nines, or 99.999% uptime, is considered the "Everest" of high availability. In today's IT world, a business continuity strategy must ensure that an organization maintains essential functions during minor failures, or in the event of a disaster. DNS is in the heart of any network, and having a performant DNS is an integral part of achieving five nines. This blog post will discuss how you can incorporate Dnsmasq in your setup to achieve five nines.
Glibc resolver interface provides some failover mechanisms by default. If we check resolv.conf manual for failover-related options, three options immediately stands out.