I've made a proposal to change the resolved.conf Cache option to a tri- state "no, no-negative, yes" values. [0]
If a lookup returns SERVFAIL systemd-resolved will cache the result for 30s (See 201d995), however, there are several use cases on which this condition is not acceptable (See #5552 comments) and the only workaround would be to disable cache entirely or flush it , which isn't optimal. This change adds the 'no-negative' option when set it avoids putting in cache negative answers but still works the same heuristics for positive answers. [0] https://github.com/systemd/systemd/pull/13047 ** Changed in: systemd (Ubuntu) Importance: Undecided => High ** Changed in: systemd (Ubuntu) Status: Confirmed => In Progress -- 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: In Progress 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
