2018-08-13 10:36:23.552 17533 ERROR oslo_db.sqlalchemy.engines "MySQL server has gone away (%r)" % (e,))
2018-08-13 10:36:23.552 17533 ERROR oslo_db.sqlalchemy.engines DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(104, 'Connection reset by peer'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-08-13 10:36:34.997 17538 ERROR oslo_db.sqlalchemy.engines [req-c9a4ea4f-3577-42c7-aed3-e34416d93c1a 34205a21a4e4430b8be896c6a6b692cb 2b1447ec414b4751965f75785cab6468 - default default] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(104, 'Connection reset by peer'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-08-13 10:36:34.997 17538 ERROR oslo_db.sqlalchemy.engines "MySQL server has gone away (%r)" % (e,))
2018-08-13 10:36:34.997 17538 ERROR oslo_db.sqlalchemy.engines DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(104, 'Connection reset by peer'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)
2018-08-13 10:38:23.231 17529 ERROR oslo_db.sqlalchemy.engines [req-ba38ec9d-ee4e-4974-933b-46c8133397c1 34205a21a4e4430b8be896c6a6b692cb 2b1447ec414b4751965f75785cab6468 - default default] Database connection was found disconnected; reconnecting: DBConnectionError: (pymysql.err.OperationalError) (2006, "MySQL server has gone away (error(104, 'Connection reset by peer'))") [SQL: u'SELECT 1'] (Background on this error at: http://sqlalche.me/e/e3q8)

[client]
port = 3306
socket = "/var/lib/mysql/mysql.sock"
[mysqld_safe]
socket = "/var/lib/mysql/mysql.sock"
nice = 0
log_error = /var/log/mysql_logs/galera_server_error.log
[mysql]
default-character-set = utf8
[mysqld]
user = mysql
collation-server = utf8_general_ci
init-connect = 'SET NAMES utf8'
character-set-server = utf8
datadir = /var/lib/mysql
bind-address = ::
server-id = 200
log-queries-not-using-indexes = 0
slow-query-log = 0
slow-query-log-file = /var/log/mysql_logs/mysql-slow.log
log_error = /var/log/mysql_logs/galera_server_error.log
log-bin = /var/lib/mysql/mariadb-bin
log-bin-index = /var/lib/mysql/mariadb-bin.index
expire-logs-days = 7
log_slave_updates = 1
log_bin_trust_function_creators = 1
max-allowed-packet = 16M
max-connect-errors = 1000000
max_connections = 1600
wait_timeout = 3600
tmp-table-size = 32M
max-heap-table-size = 32M
query-cache-type = 0
query-cache-size = 0M
thread-cache-size = 50
open-files-limit = 65535
table-definition-cache = 4096
table-open-cache = 10240
innodb-flush-method = O_DIRECT
innodb-log-file-size = 1024M
innodb-flush-log-at-trx-commit = 1
innodb-file-per-table = 1
innodb-buffer-pool-size = 4096M
innodb-read-io-threads = 4
innodb-write-io-threads = 4
innodb-doublewrite = 1
innodb-log-buffer-size = 128M
innodb-buffer-pool-instances = 8
innodb-log-files-in-group = 2
innodb-thread-concurrency = 64
innodb_stats_on_metadata = 0
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
!includedir /etc/mysql/conf.d/