在 Mac 下用 Homebrew 安装 MySQL, 网上的教程倒是很多，不过大多数都很默契地雷同。如果稍有点定制要求，就无从下手了。
我先也不免俗，从基本的开始：
$ ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
$ brew install git
$ brew update
用下面的命令就可以自动安装了：
$ brew install mysql
如果想让 MySQL 开机自动启动，可以如下操作：
$ mkdir -p ~/Library/LaunchAgents
$ ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
$ find /usr/local/Cellar/mysql/ -name "homebrew.mxcl.mysql.plist" -exec cp {} ~/Library/LaunchAgents/ \;
$ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
设置 MySQL 用户以及数据存放地址
$ unset TMPDIR
$ mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp
好了，可以启动了
$ mysql.server start
另外的参数还有 {start|stop|restart|reload|force-reload|status}
大部分的介绍就在此结束了。
作为用惯了 Linux 的人， 一定会去 /etc 下找 my.cnf, 让你失望了，这个文件要自己建立。如果看一下帮助
$ mysqld --help --verbose
就会发现系统会按这个顺序去找 my.cnf
一般网上大虾都会这么教小白建立 my.cnf, 其实这个默认的文件里面几乎没什么内容。
$ sudo cp $(brew --prefix mysql)/support-files/my-default.cnf /etc/my.cnf
所以，还是自己老老实实参考 linux 下的配置文件吧。
my.cnf (my.cnf.txt)download
#
# 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
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with
# ticks/quotes escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing
# the socket location.
[client]
port = 3306
#socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions
# are currently parsed.
[mysqld_safe]
#socket = /var/run/mysqld/mysqld.sock
#nice = 0
[mysqld]
#
# * Basic Settings
#
#
# * IMPORTANT
# If you make changes to these settings and your system uses
# apparmor, you may also need to also adjust
# /etc/apparmor.d/usr.sbin.mysqld.
#
#user = mysql
#socket = /var/run/mysqld/mysqld.sock
port = 3306
#basedir = /usr
datadir = /usr/local/var/mysql
#tmpdir = /tmp
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1
log_error = /usr/local/var/mysql/MacBook15.local.err
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or
# for replication.
# note: if you are setting up a replication slave, see
# README.Debian about other settings you may need
# to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
# Query Caching
query-cache-type = 1
# Default to InnoDB
default-storage-engine=innodb
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
错误日志默认会存在数据目录下，也就是上面所定义的 /usr/local/var/mysql/，如果 Mac 电脑名字是 MacBook，那日志的全路径就是 /usr/local/var/mysql/MacBook.local.err
取消下面两个文件中关于绑定 127.0.0.1 的语句
/etc/my.cnf
bind-address = 127.0.0.1
~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
<string>--bind-address=127.0.0.1</string>
就我个人而言，不需要 MySQL 自启动，所以只要在 /etc/my.cnf 改一下就好了。