After an overcloud deployment/update, all APIs are returning a 503 Service Unavailable error code

Solution In Progress - Updated -

Issue

  • We are no longer able to login horizon dashboard

  • All API calls are answered with a 503 Service Unavailable such as one of the following examples:

[stack@undercloud ~]$ glance image-list
503 Service Unavailable: The server is currently unavailable. Please try again at a later time. (HTTP 503)
[stack@unsercloud ~]$ openstack server list
Unknown Error (HTTP 503) (Request-ID: req-9efd9dfb-b8dc-4e82-ae75-879c8a182dc9)
[stack@undecloud ~]$ curl  -g -i --insecure -X GET http://10.10.10.10:8774/v2.1/d2df88256a464ef99dc4ab3d26335b52/servers/detail -H "User-Agent: python-novaclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}4894992643cc84c63ed03cabba720ada01a59774"
HTTP/1.1 503 Service Unavailable
Content-Length: 100
Content-Type: text/plain; charset=UTF-8
X-Compute-Request-Id: req-fd7f42a3-2a4c-4620-a6e3-9c2d5fcb3f53
Date: Mon, 25 Feb 2019 05:50:40 GMT
503 Service Unavailable

Environment

-Red Hat OpenStack Platform 9.0 (RHOSP)

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