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admin posted an update 5 years, 2 months ago
http://ben.goodacre.name/tech/DNS_Failover_/_High_Availability
DNS Failover / High Availability – ben.goodacre.name/techThe native Linux resolver with default settings cannot be relied upon for HA / failover. By default there are two attempts each with a 5 second timeout. Therefore every query has to wait 10 seconds before the secondary DNS server is queried. Linux does not
natively mark a DNS node is ‘dead’ and send all queries to a secondary node, it try the primary upon every single query.