** Also affects: cloud-init
Importance: Undecided
Status: New
** Changed in: cloud-init
Status: New => Fix Committed
** Changed in: cloud-init
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1629797
Title:
resolve service in nsswitch.conf adds 25 seconds to failed lookups
before systemd-resolved is up
Status in cloud-init:
Fix Committed
Status in cloud-init package in Ubuntu:
Fix Released
Status in dbus package in Ubuntu:
Triaged
Bug description:
During boot, cloud-init does DNS resolution checks to if particular
metadata services are available (in order to determine which cloud it
is running on). These checks happen before systemd-resolved is up[0]
and if they resolve unsuccessfully they take 25 seconds to complete.
This has substantial impact on boot time in all contexts, because
cloud-init attempts to resolve three known-invalid addresses ("does-
not-exist.example.com.", "example.invalid." and a random string) to
enable it to detect when it's running in an environment where a DNS
server will always return some sort of redirect. As such, we're
talking a minimum impact of 75 seconds in all environments. This
increases when cloud-init is configured to check for multiple
environments.
This means that yakkety is consistently taking 2-3 minutes to boot on
EC2 and GCE, compared to the ~30 seconds of the first boot and ~10
seconds thereafter in xenial.
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