下载安装程序

官网地址：https://www.mysql.com/
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点击页签“DOWLOADS“后将页面拖到底部，点MySQL Community Server。

安装数据库

按照向导操作即可

配环境变量

cd /etc/paths.d
vim .bash_profile

输入下面的内容：

export PATH=$PATH:/usr/local/mysql/bin
export PATH=$PATH:/usr/local/mysql/support-files

然后执行配置文件使其生效：

source ./.bash_profile

查看数据库状态

查看数据库的状态：

sudo mysql.server status

会报错，提示 pid 文件找不到。

查看原因：
打开macbook pro 的系统偏好，在底部找到已经安装的数据库。
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接着点击页签configuration，找到错误日志文件的路径。
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查看日志文件：

sudo tail /usr/local/mysql/data/mysqld.local.err

看文件末尾最新的日志，可以大致知道是因为变量 server_id的配置问题，而这个变量是在某个.cnf文件中配置的，我不知道默认的.cnf文件在哪个目录下，但是可以在 /etc/ 下面创建一个名为 my.cnf的文件来取代默认的，文件内容如下：

# 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

[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /usr/local/mysql/data/mysqld.local.pid
socket = /tmp/mysql.sock
port = 3306
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
tmpdir = /tmp
lc-messages-dir = /usr/local/mysql/share
log-error = /usr/local/mysql/data/mysqld.local.err
pid-file = /usr/local/mysql/data/mysqld.local.pid

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

#
# * Character sets
#
collation-server = utf8mb4_unicode_ci
init-connect='SET NAMES utf8mb4'
character-set-server = utf8mb4

#
# * MyISAM
#
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched. On error, make copy and try a repair.
myisam_recover_options = BACKUP

#
# * NDB Cluster
#
# See /usr/local/mysql/bin/ndbd
# Note: ndbd init script requires this to include nodeid!
# datadir=/usr/local/mysql/data
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1

[mysqld_safe]
log-error = /usr/local/mysql/data/mysqld.local.err
pid-file = /usr/local/mysql/data/mysqld.local.pid

#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /usr/local/mysql/data/.
# Read the manual for more InnoDB related options. There are many!
innodb_buffer_pool_size = 128M

[client]
port = 3306
socket = /tmp/mysql.sock