将my.cnf更改为设置MySQL复制

我按照教程设置MySQL复制（我使用的是Ubuntu）

根据以上教程，这是我希望在my.cnf文件中使用的配置：

[mysqld]
log-bin = mysql-bin
server-id = 1
relay-log = relay-log-slave
gtid-mode =ON
enforce-gtid-consistency
binlog_format = MIXED
log_slave_updates

我在下面找到了my.cnf:

/etc/mysql

：

当我打开my.cnf时，这是内容（不确定为什么文件图标显示为快捷图标？）

#
#MySQL数据库服务器配置文件。
#                                              /****************************/
#您可以将其从MySQL 5.7复制到以下路径之一：/*，默认配置文件路径为
/etc/MySQL/MySQL.conf.d/mysqld.cnf

在5.7版本之前，文件路径将是
/etc/mysql/my.cnf
或
/etc/my.cnf

如果参数不存在，则添加到配置文件的
[mysqld]
部分

#
# The MySQL database server configuration file.
#                                              /****************************/
# You can copy this to one of:                 /* <-- what does this mean? */   
# - "/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/