# yum remove mariadb-libs
# rm -rf /var/lib/mysql

# yum localinstall http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
# ls -al /etc/yum.repos.d/
合計 48
drwxr-xr-x.  2 root root  250  9月 10 23:30 .
drwxr-xr-x. 77 root root 8192 10月 28 03:58 ..
-rw-r--r--.  1 root root 1664 11月 30  2016 CentOS-Base.repo
-rw-r--r--.  1 root root 1309 11月 30  2016 CentOS-CR.repo
-rw-r--r--.  1 root root  649 11月 30  2016 CentOS-Debuginfo.repo
-rw-r--r--.  1 root root  630 11月 30  2016 CentOS-Media.repo
-rw-r--r--.  1 root root 1331 11月 30  2016 CentOS-Sources.repo
-rw-r--r--.  1 root root 2893 11月 30  2016 CentOS-Vault.repo
-rw-r--r--.  1 root root  314 11月 30  2016 CentOS-fasttrack.repo
-rw-r--r--.  1 root root 1885  4月 27  2017 mysql-community-source.repo
-rw-r--r--.  1 root root 1838  4月 27  2017 mysql-community.repo
# yum info mysql-community-server
名前                : mysql-community-server
アーキテクチャー    : x86_64
バージョン          : 5.7.20
リリース            : 1.el7
容量                : 164 M
リポジトリー        : mysql57-community/x86_64
要約                : A very fast and reliable SQL database server
URL                 : http://www.mysql.com/
※以下省略

# yum install mysql-community-server
# mysqld --version
mysqld  Ver 5.7.20 for Linux on x86_64 (MySQL Community Server (GPL))

# systemctl enable mysqld
# systemctl start mysqld
# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since 日 2017-10-29 12:09:18 JST; 23min ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
 Main PID: 10755 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─10755 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

10月 29 12:09:15 CentOS73 systemd[1]: Starting MySQL Server...
10月 29 12:09:18 CentOS73 systemd[1]: Started MySQL Server.

# grep password /var/log/mysqld.log
2017-10-29T10:25:52.159050Z 1 [Note] A temporary password is generated for root@localhost: Plk9tS3omI?#

# mysql_secure_installation

Securing the MySQL server deployment.

Enter password for user root:　※ここでrootユーザの初期パスワードを入力

The existing password for the user account root has expired. Please set a new password.

New password:　※ここでrootユーザの新パスワードを入力

Re-enter new password:　※ここでrootユーザの新パスワードを入力

The 'validate_password' plugin is installed on the server.
The subsequent steps will run with the existing configuration
of the plugin.
Using existing password for root.

Estimated strength of the password: 100
Change the password for root ? ((Press y|Y for Yes, any other key for No) : n　※またrootユーザのパスワードを変更するか聞かれるので、NoでOK

 ... skipping.
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.

Remove anonymous users? (Press y|Y for Yes, any other key for No) : y　※匿名ユーザの削除、yを入力
Success.


Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.

Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y　※rootユーザのリモートログインの禁止、yを入力
Success.

By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.


Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y　※testデータベースの削除、yを入力
 - Dropping test database...
Success.

 - Removing privileges on test database...
Success.

Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.

Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y　※権限テーブルの再読み込みを実施、yを入力
Success.

All done!