docker-compose is ok

docs/mysqld.cnf

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+# Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License, version 2.0,
+# as published by the Free Software Foundation.
+#
+# This program is also distributed with certain software (including
+# but not limited to OpenSSL) that is licensed under separate terms,
+# as designated in a particular file or component or in included license
+# documentation.  The authors of MySQL hereby grant you an additional
+# permission to link the program and your derivative works with the
+# separately licensed software that they have included with MySQL.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License, version 2.0, for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+#
+# The MySQL  Server configuration file.
+#
+# For explanations see
+# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
+
+[mysqld]
+character-set-server = utf8
+collation-server = utf8_unicode_ci
+skip-character-set-client-handshake
+pid-file	= /var/run/mysqld/mysqld.pid
+socket		= /var/run/mysqld/mysqld.sock
+datadir		= /var/lib/mysql
+default-storage-engine=INNODB
+# Disabling symbolic-links is recommended to prevent assorted security risks
+skip-external-locking
+key_buffer_size=16M
+max_allowed_packet=4M
+table_open_cache=64
+sort_buffer_size=512K
+net_buffer_length=8K
+read_buffer_size=256K
+read_rnd_buffer_size=512K
+skip-name-resolve
+max_connections=1000
+slow_query_log = ON
+slow_query_log_file = /var/log/mysql_slow.log
+long_query_time = 1
+sql_mode="STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
+#log-error	= /var/log/mysql/error.log
+# By default we only accept connections from localhost
+#bind-address	= 127.0.0.1
+# Disabling symbolic-links is recommended to prevent assorted security risks