ubuntu16 mysql配置文件my.cnf中没有bind-address

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使用ubuntu16安装mysql时，发现mysql的配置文件/etc/mysql/my.cnf 里面基本没有什么东西：

#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
# 
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/

改不了bind-address，其实bind address是在这里面的：
/etc/mysql/mysql.conf.d/mysqld.cnf