Azure云中已经创建了Azure Database for MySQL服务
需要通过虚拟机Virtual machines连接Azure Database for MySQL数据库

1. 安装MySQL客户端在Virtual machines中

首先：MySQL有两种服务：MySQL的服务端和 MySQL的客户端。无论是Windows是还是Linux都是有服务端和客户端之分的。我们平时传统的“mysql -uroot -p”其实是使用的MySQL的客户端(MySQL)直连MySQL的服务端(mysqld)的。

由于Azure中直接配置的Azure Database for MySQL服务，我们不需要再安装MySQL，如果通过Internal方式连接，只需要在VM中安装MySQL客户端即可：

# yum install mysql

注意：通过yum方式安装MySQL时候，
yum -y install mysql mysql-server mysql-devel
其中的mysql就是MySQL客户端的意思，mysql-server是MySQL的服务端，mysql-devel是MySQL的开发端。

安装过程可能出现的信息示例：

Loaded plugins: downloadonly, fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: mirror.wiredtree.com
 * extras: mirrors.serveraxis.net
 * updates: bay.uchicago.edu
Setting up Install Process
Resolving Dependencies
--> Running transaction check
--> Package mysql.x86_64 0:5.1.71-1.el6 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package         Arch             Version                  Repository      Size
================================================================================
Installing:
 mysql           x86_64           5.1.71-1.el6             base           893 k
 
Transaction Summary
================================================================================
Install       1 Package(s)
 
Total download size: 893 k
Installed size: 2.4 M
Is this ok [**y/N**]: y
Downloading Packages:
mysql-5.1.71-1.el6.x86_64.rpm                            | 893 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : mysql-5.1.71-1.el6.x86_64                                    1/1 
  Verifying  : mysql-5.1.71-1.el6.x86_64                                    1/1 
 
Installed:
  mysql.x86_64 0:5.1.71-1.el6                                                   
 
Complete!

2. 连接到Azure Database for MySQL中

mysql -u USER-NAME-HERE -h MYSQL-DB-SERVER-IP-ADDRESS-HERE -p DB-NAME
mysql -h 10.20.30.40 -u username@hostname -p ******