Following the reboot for kernel upgrades, we have lost access to the Beta-Cluster-Infrastructure instances that host the mariadb databases :-/

That is apparently because the DNS config (/etc/resolv.conf) is borked somehow

2017-06-21T19:26:05.871176+00:00 deployment-db03 diamond[473]: sudo: ldap_start_tls_s(): Can't contact LDAP server
2017-06-21T19:26:05.875259+00:00 deployment-db03 diamond[473]: sudo: unable to resolve host deployment-db03

Deployment-db03 https://horizon.wikimedia.org/project/instances/6fecded6-702a-43b6-8b7b-3176e4c7fbf5/

Deployment-db04 https://horizon.wikimedia.org/project/instances/030eb4f1-89ce-492a-8efa-4351e5e8e751/