** Patch added: "lp1668771-bionic.debdiff"
https://bugs.launchpad.net/systemd/+bug/1668771/+attachment/5278752/+files/lp1668771-bionic.debdiff
** Summary changed:
- systemd-resolved negative caching for extended period of time
+ [SRU] systemd-resolved negative caching for extended period of
** Description changed:
- 231-9ubuntu3
+ [Impact]
- If a DNS lookup returns SERVFAIL, systemd-resolved seems to cache the
+ * 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
** Merge proposal linked:
https://code.launchpad.net/~ddstreet/ubuntu/+source/systemd/+git/systemd/+merge/370455
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** Tags added: sts sts-sru-needed
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https://bugs.launchpad.net/bugs/1668771
Title:
systemd-resolved negative caching for extended period of time
Status in
The attachment "lp1668771-eoan.debdiff" seems to be a debdiff. The
ubuntu-sponsors team has been subscribed to the bug report so that they
can review and hopefully sponsor the debdiff. If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
"patch" tag,
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Title:
systemd-resolved negative caching for extended period of time
Status in systemd:
New
Status in systemd
** Patch added: "lp1668771-eoan.debdiff"
https://bugs.launchpad.net/systemd/+bug/1668771/+attachment/5278115/+files/lp1668771-eoan.debdiff
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** Changed in: systemd (Ubuntu Disco)
Importance: Undecided => High
** Changed in: systemd (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: systemd (Ubuntu Xenial)
Importance: Undecided => High
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** Also affects: systemd (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: systemd (Ubuntu Disco)
Assignee: (unassigned) => Jorge Niedbalski (niedbalski)
** Changed in: systemd (Ubuntu Bionic)
Assignee: (unassigned) => Jorge Niedbalski (niedbalski)
** Changed
** Also affects: systemd (Ubuntu Disco)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu Eoan)
Importance: High
Assignee: Jorge Niedbalski (niedbalski)
Status: In Progress
** Also affects: systemd (Ubuntu Bionic)
Importance: Undecided
Status:
The proposal to extend the 'cache' option with 'no-negative' has been
merged upstream. I will proceed with the backports to Ubuntu on the
affected LTS releases.
[0] https://github.com/systemd/systemd/pull/13047
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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
** Changed in: systemd (Ubuntu)
Assignee: (unassigned) => Jorge Niedbalski (niedbalski)
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Title:
This affects bionic openstack cloud environments when os-*-hostname is
configured for keystone, and the keystone entry is deleted temporarily
from upstream dns, or the upstream dns fails providing no record for the
lookup of keystone.endpoint.domain.com.
We have to then flush all caches across
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,
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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** Changed in: systemd
Status: Unknown => New
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https://bugs.launchpad.net/bugs/1668771
Title:
systemd-resolved negative caching for extended period
I believe this should be filed upstream instead.
** Bug watch added: github.com/systemd/systemd/issues #5552
https://github.com/systemd/systemd/issues/5552
** Also affects: systemd via
https://github.com/systemd/systemd/issues/5552
Importance: Unknown
Status: Unknown
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