I am using "Linux Virtual Server" (LVS) [1] with ldirectord [2] to
distribute DNS traffic across multiple DNSdist servers. LVS and
ldirectord are part of all common Linux distributions. LVS in direct
routing mode (DR) is a very high-performance layer 2-4 load balancer
solution.
Another solution might be to run multiple dnsdist processes on a server
with many CPU cores.
[1] http://www.linuxvirtualserver.org/VS-DRouting.html
[2] https://github.com/ClusterLabs/resource-agents/tree/main/ldirectord
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