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Is there a way to tell your system to fall back to the last known IP address if DNS server isn't reachable? Basically soft-invalidate your local DNS cache but

by dheera 5y ago

Is there a way to tell your system to fall back to the last known IP address if DNS server isn't reachable? Basically soft-invalidate your local DNS cache but it back from the cache graveyard if DNS is down.

bombcar 5y ago
It should be possible to set your cache so it lives forever but still checks for a new IP at normal expiring time.
deleted 5y ago
[deleted]
TimWolla 5y ago
Unbound has a 'serve-expired' option: https://nlnetlabs.nl/documentation/unbound/unbound.conf/#serve-expired https://nlnetlabs.nl/documentation/unbound/unbound.conf/#ser...
elithrar 5y ago
You could run a local resolver like dnsmasq or Unbound that can “serve stale” on upstream failures, but that assumes the DNS failure is a client-facing resolver one. From what I observed here, it was more internal DNS related: Newegg was serving an opaque “DNS failure” error page from Akamai’s front-end which is likely because their infra was failing to resolve names internally.