I installed mitaka but somtime i got the error:

(errno, errorvalue)\n', u"OperationalError: (pymysql.err.OperationalError) (1040, u'Too many connections')\n"]. 2016-12-03 11:44:02.318 22234 ERROR nova.servicegroup.drivers.db

And then I must restart all service Mysql config:

[mysqld] bind-address = 192.168.77.2 default-storage-engine = innodb innodb_file_per_table max_connections = 4096 collation-server = utf8_general_ci character-set-server = utf8

May I miss some config? please teach me. Thanks