@juliank
I *believe* this is impacting our AWS ubuntu EC2 machines and causing wild DNS
errors impacting our users, I tried to apply the patch in this thread but it
doesn't work, it complains like this
/etc/dhcp/dhclient-enter-hooks.d/resolved: Syntax error: "("
unexpected
about this line
if ! cmp --quiet $oldstate <(md5sum $statedir/isc-
dhcp-v4-$interface.conf $statedir/isc-dhcp-v6-$interface.conf 2>&1);
then
Also for me this line
+ md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir
/isc-dhcp-v6-$interface.conf &> $oldstate
outputs to stdout
$ sudo dhclient
RTNETLINK answers: File exists
d41d8cd98f00b204e9800998ecf8427e
/run/systemd/resolved.conf.d/isc-dhcp-v4-ens5.conf
md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-ens5.conf: No such file or
directory
and the resulting temp file is empty.
Dunno why your patch misbehaves like this but I really have no time to
investigate further.
I've attached a patch that seems to be working on our servers in case
others are experiencing the same issue and need a quick fix.
----
Adding few server details in case you need 'em:
$ uname -a
Linux ip-172-31-14-255 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
$ dhclient --version
isc-dhclient-4.3.5
$ systemd --version
systemd 237
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP
+GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2
default-hierarchy=hybrid
$ bash --version
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
** Patch added: "adding on top of juliank work to make it run on ubuntu"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1805183/+attachment/5223864/+files/0001-making-it-work-on-aws-ec2.patch
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https://bugs.launchpad.net/bugs/1805183
Title:
systemd-resolved constantly restarts on Bionic upgraded from Xenial
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