[Cloud] Cloud VPS DNS resolver on some unmaintained virtual machines

Hi there, We recently did some DNS maintenance operations [0]. As part of the maintenance, we moved the DNS recursor server IP address to be 172.20.255.1. However, we have detected a number of virtual machines with broken puppet, that did not pick up the change. This is traditionally done via the file /etc/resolv.conf with a line like: === 8< === nameserver 172.20.255.1 === 8< === Please fix the virtual machines to use the new resolver, or if the machine is not in use, consider shutdown (or delete) it. Feel free to ask for assistance if required [1]. After some period of time, the old resolver addresses will stop working and unmaintained virtual machines will become even more broken. thanks, regards. [0] https://lists.wikimedia.org/hyperkitty/list/cloud-announce@lists.wikimedia.… [1] https://wikitech.wikimedia.org/wiki/Help:Cloud_Services_introduction#Commun… -- Arturo Borrero Gonzalez Senior SRE / Wikimedia Cloud Services Wikimedia Foundation