Public bug reported: [Issue] On Jammy, the stub-resolv.conf file on /run/systemd/resolve gets overwritten if dhclient is executed.
While debugging this, I found the reference on LP#1889068 [0] of the move of `resolved` hook from dhclient-enter-hooks.d/ to dhclient-exit- hooks.d/, and this new hook [2] has no reference of make_resolv_conf() being called. [Reproducer] - I used a cloud-image based Jammy installation (uvt-kvm). Once in: $ cat /run/system/resolve/stub-resolv.conf And one will see: nameserver 127.0.0.53 options edns0 trust-ad search . Then: $ sudo dhclient $ cat /run/system/resolve/stub-resolv.conf You'll see the definition of the nameserver(s) in, and the stub IP address no longer there. To revert this, a `systemctl restart systemd- resolved` is needed. [Impact] This is an improper way to keep nameserver(s) in *resolv* files; the override of the file should never happen in these circumstances. [Extra] - As a minor test, I copied over the dhclient-enter-hooks.d/resolved file from a Focal installation to a Jammy one, and the problem _does not happen_ when such hook is in place. [ . . . ] Let me know if further clarification is needed to proceed. Thank you. BR, pprincipeza [0] https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1889068 [1] https://paste.ubuntu.com/p/bvqPZXZZ8w/ [2] https://paste.ubuntu.com/p/YQdG6z4WS7/ ** Affects: isc-dhcp (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1972029 Title: dhclient overriding stub-resolv.conf file on Jammy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1972029/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
