OSP 9 Deployment with RHEL 7.2 Undercloud fails consistently for 45 compute nodes

Solution Verified - Updated -

Issue

  • Too many connections errors are seen in /var/log/nova/nova-api.log:
2017-01-23 08:56:49.880 43247 ERROR oslo_service.service DBError: (pymysql.err.InternalError) (1129, u"Host '192.100.0.101' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'")
  • Warning seen in /var/log/mariadb/mariadb.log of the undercloud:
170123  8:59:38 [Warning] Could not increase number of max_open_files to more than 1024 (request: 4907)
  • Verify the current open files limit:
# mysql
MariaDB [(none)]> show global variables like 'open%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| open_files_limit | 1024  |
+------------------+-------+

Environment

  • Red Hat OpenStack Platform 9.0
  • Red Hat Enterprise Linux 7.2

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