Public bug reported:
I'm seeing very slow 'sudo' times in a qemu guest when the host uses
systemd-resolved.
If I change /etc/resolv.conf on the host to point directly to a dns server
(8.8.8.8) then the problem goes away.
To recreate, you can download a cloud image and boot it under qemu with a
command line like:
cloud-localds seed.img user-data meta-data
qemu-system-x86_64 -enable-kvm \
-device virtio-net-pci,netdev=net00 \
-netdev type=user,id=net00 \
-drive file=root.img,id=disk00,if=none,index=0 \
-device virtio-blk,drive=disk00,serial=root.img \
-drive file=seed.img,id=disk01,if=none,index=1 \
-device virtio-blk,drive=disk01,serial=seed.img \
-m 768
Make sure that your hostname does not resolve (change it to 'bogus-host1').
Log into the guest and then just try sudo, you'll see something like:
# time sudo ls
sudo: unable to resolve host rooturl-trusty
real 0m10.029s
user 0m0.006s
sys 0m0.011s
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1730744
Title:
sudo is slow (10 seconds) when hostname is not resolvable
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