@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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1805183 Title: systemd-resolved constantly restarts on Bionic upgraded from Xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1805183/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs