mac 系统常用的软件安装工具就是 homebrew，如果你还不熟悉这个工具，请参考homebrew的使用
以下是我在安装mysql中所遇到的问题：
卸载
因为之前安装过一次，有很多问题，从新安装之前最好卸载掉原来的
$ brew remove mysql
$ brew cleanup
$ launchctl unload -w ~/Library/LaunchAgents/com.mysql.mysqld.plist
$ rm ~/Library/LaunchAgents/com.mysql.mysqld.plist
$ sudo rm -rf /usr/local/var/mysql
安装
$ brew install mysql
....
$ /usr/local/Homebrew/Library/Homebrew/brew.rb:12:in `<main>': Homebrew must be run under Ruby 2.3! You're running 2.0.0. (RuntimeError)
此处报错了，提示Homebrew 必须在ruby2.3版本以上运行，而我现在的ruby版本是2.0，怎么办，只能升级ruby
如何升级ruby
mac下可以安装ruby的管理工具rvm
$ curl -L get.rvm.io | bash -s stable
$ source /Users/你的用户名/.rvm/scripts/rvm
$ rvm -v
$ rvm list known
$ rvm install 2.4.1
$ ruby -v
再次执行 brew install mysql
==> Downloading https://homebrew.bintray.com/bottles/mysql-5.7.20.sierra.bottle.tar.gz
######################################################################## 100.0%
==> Pouring mysql-5.7.20.sierra.bottle.tar.gz
==> /usr/local/Cellar/mysql/5.7.20/bin/mysqld --initialize-insecure --user=shen --basedir
==> Caveats
We've installed your MySQL database without a root password. To secure it run:
mysql_secure_installation
MySQL is configured to only allow connections from localhost by default
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
==> Summary
🍺 /usr/local/Cellar/mysql/5.7.20: 324 files, 233.7MB
到此处安装成功
启动命令
$ mysql.server start
设置密码
mysqladmin -u root password 'xxx'
参考资料:
