查看mysql的安装位置：
huijundeMacBook-<span style="color: #000000;">Pro:bin huijunzhang$ which mysql </span>/usr/local/bin/mysql
说明mysql还是安装过的
huijundeMacBook-<span style="color: #000000;">Pro:bin huijunzhang$ brew info mysql
mysql: stable </span><span style="color: #800080;">5.7</span>.<span style="color: #800080;">13</span><span style="color: #000000;"> (bottled)
Open source relational database management system
https:</span><span style="color: #008000;">//</span><span style="color: #008000;">dev.mysql.com/doc/refman/5.7/en/</span>
Conflicts with: mariadb, mariadb-connector-c, mysql-cluster, mysql-connector-c, percona-<span style="color: #000000;">server
</span>/usr/local/Cellar/mysql/<span style="color: #800080;">5.7</span>.<span style="color: #800080;">13</span> (<span style="color: #800080;">13</span>,<span style="color: #800080;">344</span> files, <span style="color: #800080;">445.0M</span>) *<span style="color: #000000;">
Poured </span><span style="color: #0000ff;">from</span> bottle on <span style="color: #800080;">2016</span>-<span style="color: #800080;">06</span>-<span style="color: #800080;">30</span> at <span style="color: #800080;">15</span>:<span style="color: #800080;">05</span>:<span style="color: #800080;">40</span><span style="color: #000000;">
From: https:</span><span style="color: #008000;">//</span><span style="color: #008000;">github.com/Homebrew/homebrew-core/blob/master/Formula/mysql.rb</span>
==><span style="color: #000000;"> Dependencies
Build: cmake ?
Required: openssl ?
</span>==><span style="color: #000000;"> Options
</span>--with-archive-storage-<span style="color: #000000;">engine
Compile with the ARCHIVE storage engine enabled
</span>--with-blackhole-storage-<span style="color: #000000;">engine
Compile with the BLACKHOLE storage engine enabled
</span>--with-<span style="color: #000000;">debug
Build with debug support
</span>--with-<span style="color: #000000;">embedded
Build the embedded server
</span>--with-local-<span style="color: #000000;">infile
Build with local infile loading support
</span>--with-<span style="color: #000000;">test
Build with unit tests
</span>==><span style="color: #000000;"> Caveats
We</span><span style="color: #800000;">‘</span><span style="color: #800000;">ve installed your MySQL database without a root password. To secure it run:</span>
<span style="color: #000000;"> mysql_secure_installation
To connect run:
mysql </span>-<span style="color: #000000;">uroot
To have launchd start mysql now and restart at login:
brew services start mysql
Or, </span><span style="color: #0000ff;">if</span> you don<span style="color: #800000;">‘</span><span style="color: #800000;">t want/need a background service you can just run:</span>
mysql.server start
有可能是mysql服务没有启动
huijundeMacBook-<span style="color: #000000;">Pro:bin huijunzhang$ mysql.server start Starting MySQL . SUCCESS</span>!
哈哈，mysql服务启动了，好开心呀！
接下来要试试能否进入mysql了
huijundeMacBook-<span style="color: #000000;">Pro:bin huijunzhang$ mysql ERROR </span><span style="color: #800080;">1045</span> (<span style="color: #800080;">28000</span>): Access denied <span style="color: #0000ff;">for</span> user <span style="color: #800000;">‘</span><span style="color: #800000;">huijunzhang</span><span style="color: #800000;">‘</span>@<span style="color: #800000;">‘</span><span style="color: #800000;">localhost</span><span style="color: #800000;">‘</span> (<span style="color: #0000ff;">using</span> password: NO)
这个提示应该很明显了吧，权限问题，mysql下没有huijunzhang这个用户，装过mysql的朋友应该知道，安装mysql默认的用户名是root,端口是3306，别问我为什么知道。。。
那就使用root用户启动：
huijundeMacBook-<span style="color: #000000;">Pro:bin huijunzhang$ sudo mysql
Password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id </span><span style="color: #0000ff;">is</span> <span style="color: #800080;">4</span><span style="color: #000000;">
Server version: </span><span style="color: #800080;">5.7</span>.<span style="color: #800080;">13</span><span style="color: #000000;"> Homebrew
Copyright (c) </span><span style="color: #800080;">2000</span>, <span style="color: #800080;">2016</span>, Oracle and/<span style="color: #000000;">or its affiliates. All rights reserved.
Oracle </span><span style="color: #0000ff;">is</span> a registered trademark of Oracle Corporation and/<span style="color: #000000;">or its
affiliates. Other names may be trademarks of their respective
owners.
Type </span><span style="color: #800000;">‘</span><span style="color: #800000;">help;</span><span style="color: #800000;">‘</span> or <span style="color: #800000;">‘</span><span style="color: #800000;">h</span><span style="color: #800000;">‘</span> <span style="color: #0000ff;">for</span> help. Type <span style="color: #800000;">‘</span><span style="color: #800000;">c</span><span style="color: #800000;">‘</span><span style="color: #000000;"> to clear the current input statement.
mysql</span>><span style="color: #000000;">
mysql</span>><span style="color: #000000;"> show databases
</span>-><span style="color: #000000;"> ;
</span>+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
<span style="color: #800080;">4</span> rows <span style="color: #0000ff;">in</span> <span style="color: #0000ff;">set</span> (<span style="color: #800080;">0.01</span> sec)
哈哈，问题解决了，好开心呀！
总结：出现“ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/tmp/mysql.sock‘ (2)”的根本原因就是mysql服务没有启动,下面总结下mysql在mac下的几个常用的命令吧！
<span style="color: #000000;">$ mysql.server start $ mysql.server restart $ mysql.server stop $ mysql.server status<br />$ </span><span class="s1">mysql -u root -p</span>
Mac下Mysql启动异常["ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"]
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本文系统来源：http://www.cnblogs.com/zhjsll/p/5702950.html
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