As part of some long-deferred routine maintenance, we need to update (and, in one case, physically move) the network servers that handle all traffic between WMCS instances. During each change, all WMCS network traffic (including network access to all tools and VMs) will be interrupted for several minutes.
The first outage will be:
Tuesday, May 15 at 13:00 UTC
The second outage will be three hours later:
Tuesday, May 15 16:00 UTC
In each case outages should last no more than ten to fifteen minutes.
More details about this move can be found at https://phabricator.wikimedia.org/T193579 .