This is especially upsetting in an OpenStack and server environment where external DNS is being used to reach/resolve API endpoints and other systems such as database servers. A small outage to DNS becomes a potentially unbounded outage when the SERVFAIL responses are cached indefinitely, requiring manual intervention on each host in addition to fixing the cause of the SERVFAIL.
** Tags added: canonical-bootstack -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1668771 Title: systemd-resolved negative caching for extended period of time Status in systemd: New Status in systemd package in Ubuntu: Confirmed Bug description: 231-9ubuntu3 If a DNS lookup returns SERVFAIL, systemd-resolved seems to cache the result for very long (infinity?). I have to restart systemd-resolved to have the negative caching purged. After SERVFAIL DNS server issue has been resolved, chromium/firefox still returns DNS error despite host can correctly resolve the name. To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1668771/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
