CentOS7にmysqlを入れたいのにmariaDBが入ってしまう

現在、vagrantの中にrails環境を構築しようとしています。

そこで、mysqlを導入したいのですが、
mariaDBが入っていると競合するみたいなので、

最初に入っていたmariaDBを、
$ sudo yum list installed | grep maria
このコマンドで調べて、

$ sudo yum -y remove mariadb-libs
で削除して、mysqlを入れようとしたのですが、

$ sudo yum -y install mysql

このコマンドを打っても、

結局mariaDBが入ってしまいます。

以下が実行結果です。


$ sudo yum -y install mysql

Failed to set locale, defaulting to C
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: ftp.riken.jp
 * extras: ftp.riken.jp
 * updates: ftp.riken.jp
Resolving Dependencies
--> Running transaction check
---> Package mariadb.x86_64 1:5.5.47-1.el7_2 will be installed
--> Processing Dependency: mariadb-libs(x86-64) = 1:5.5.47-1.el7_2 for package: 1:mariadb-5.5.47-1.el7_2.x86_64
--> Running transaction check
---> Package mariadb-libs.x86_64 1:5.5.47-1.el7_2 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================
 Package                  Arch               Version                        Repository           Size
======================================================================================================
Installing:
 mariadb                  x86_64             1:5.5.47-1.el7_2               updates             8.9 M
Installing for dependencies:
 mariadb-libs             x86_64             1:5.5.47-1.el7_2               updates             755 k

Transaction Summary
======================================================================================================
Install  1 Package (+1 Dependent package)

Total size: 9.7 M
Total download size: 8.9 M
Installed size: 53 M
Downloading packages:
mariadb-5.5.47-1.el7_2.x86_64.rpm                                              | 8.9 MB  00:00:18
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 1:mariadb-libs-5.5.47-1.el7_2.x86_64                                               1/2
  Installing : 1:mariadb-5.5.47-1.el7_2.x86_64                                                    2/2
  Verifying  : 1:mariadb-libs-5.5.47-1.el7_2.x86_64                                               1/2
  Verifying  : 1:mariadb-5.5.47-1.el7_2.x86_64                                                    2/2

Installed:
  mariadb.x86_64 1:5.5.47-1.el7_2

Dependency Installed:
  mariadb-libs.x86_64 1:5.5.47-1.el7_2

Complete!