https://www.cnblogs.com/zhjsll/p/5702950.html
在mac下使用brew安装mysql，之前没有使用过，今天启动的时候发现启动不了
huijundeMacBook-Pro:bin huijunzhang$ mysql ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2) 查看mysql的安装位置：
huijundeMacBook-Pro:bin huijunzhang$ which mysql /usr/local/bin/mysql 说明mysql还是安装过的
复制代码 huijundeMacBook-Pro:bin huijunzhang$ brew info mysql mysql: stable 5.7.13 (bottled) Open source relational database management system https://dev.mysql.com/doc/refman/5.7/en/ Conflicts with: mariadb, mariadb-connector-c, mysql-cluster, mysql-connector-c, percona-server /usr/local/Cellar/mysql/5.7.13 (13,344 files, 445.0M) * Poured from bottle on 2016-06-30 at 15:05:40 From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/mysql.rb ==> Dependencies Build: cmake ✘ Required: openssl ✔ ==> Options –with-archive-storage-engine Compile with the ARCHIVE storage engine enabled –with-blackhole-storage-engine Compile with the BLACKHOLE storage engine enabled –with-debug Build with debug support –with-embedded Build the embedded server –with-local-infile Build with local infile loading support –with-test Build with unit tests ==> Caveats We’ve installed your MySQL database without a root password. To secure it run: mysql_secure_installation
To connect run: mysql -uroot
To have launchd start mysql now and restart at login: brew services start mysql Or, if you don’t want/need a background service you can just run: mysql.server start 复制代码 有可能是mysql服务没有启动
huijundeMacBook-Pro:bin huijunzhang$ mysql.server start Starting MySQL . SUCCESS! 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-Pro:bin huijunzhang$ mysql ERROR 1045 (28000): Access denied for user ‘huijunzhang’@‘localhost’ (using 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：
复制代码 huijundeMacBook-Pro:bin huijunzhang$ sudo mysql Password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.7.13 Homebrew
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mysql> mysql> show databases -> ; ±-------------------+ | Database | ±-------------------+ | information_schema | | mysql | | performance_schema | | sys | ±-------------------+ 4 rows in set (0.01 sec) 复制代码 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！
$ mysql.server start $ mysql.server restart $ mysql.server stop $ mysql.server status $ mysql -u root -p
