$ sudo -s
# df -lh
Filesystem  Size Used Avail Use% Mounted on
/dev/vda1  79G 1.6G 74G 3% /
udev   3.9G 8.0K 3.9G 1% /dev
tmpfs   799M 252K 799M 1% /run
none   5.0M  0 5.0M 0% /run/lock
none   3.9G  0 3.9G 0% /run/shm
# uname -a
Linux nj01 3.16.0-34-generic #47~14.04.1-Ubuntu SMP Fri Apr 10 17:49:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

# rpm -qa|grep yum
The program 'rpm' is currently not installed. You can install it by typing:
apt-get install rpm
# apt-get install rpm
……
# rpm -qa|grep yum
# yum install 
The program 'yum' is currently not installed. You can install it by typing:
apt-get install yum
# apt-get install yum
……
# yum install mysql
Setting up Install Process
No package mysql available.
Nothing to do

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' identified by '******';
Query OK, 0 rows affected (0.00 sec)

mysql> 
mysql> 
mysql> 
mysql> 
mysql> 
mysql> create database testdb;
Query OK, 1 row affected (0.01 sec)

mysql> 
mysql> 
mysql> 
mysql> 
mysql> show databases;
+--------------------+
| Database   |
+--------------------+
| information_schema |
| mysql    |
| testdb    |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

mysql> insert into mysql.user(Host,User,Password) values("%","test",password("******"));
Query OK, 1 row affected, 3 warnings (0.00 sec)

mysql> 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON testdb.* TO 'test'@'% identified by '******';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

# 启动MySQL$ sudo service mysql start 
# 关闭MySQL$ sudo service mysql stop
# 重启MySQL$ sudo service mysql restart
# 其他命令：$ sudo /etc/init.d/mysql start
$ sudo /etc/init.d/mysql stop
$ sudo /etc/init.d/mysql restart

sudo apt-get autoremove mysql* --purge
sudo apt-get remove apparmor
sudo apt-get install mysql-server mysql-common