每次安裝使用mysql都折騰很長時間，這次折騰完畢，把最簡單的安裝使用記錄下來，叫懶人mysql

yum 安裝mysql

1.下載mysql的repo源

$ wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

2. 安裝mysql-community-release-el7-5.noarch.rpm包

$ sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm

安裝這個包后，會獲得兩個mysql的yum repo源：

/etc/yum.repos.d/mysql-community.repo
/etc/yum.repos.d/mysql-community-source.repo

3. 安裝mysql

$ sudo yum install mysql-server mysql-client libmysqlclient-dev mysql-devel MySQL-python

4.初始化mysql

$ mysql_install_db

簡單使用mysql

1.設置root密碼

登陸mysql：

$ mysql -u root

設置密碼

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

2.創建數據庫

CREATE DATABASE `testDB` DEFAULT CHARACTER SET utf8

3.創建用戶并最大權限：

CREATE USER test@'%' IDENTIFIED BY 'test';
grant all privileges on testDB.* to test@'%' IDENTIFIED BY 'test';