CentOS 7
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MariaDB 10.2 : Install2017/10/30

The version of MariaDB in CentOS 7 repository is 5.5 but Install 10.2 with RPM package if you need.
[1] It's possible to install from CentOS SCLo Software Collections.
It's OK to install it even if 5.5 is already installed because 10.2 is located on another PATH.
# install from SCLo

[root@www ~]#
yum --enablerepo=centos-sclo-rh -y install rh-mariadb102-mariadb-server
[2] Packages from Software Collections are installed uder the /opt directory.
To use it, Load environment variables like follows.
# load environment variables

[root@www ~]#
scl enable rh-mariadb102 bash
[root@www ~]#
mysql -V

mysql Ver 15.1 Distrib 10.2.8-MariaDB, for Linux (x86_64) using EditLine wrapper
[root@www ~]#
which mysql

[3] If you'd like to enable MariaDB 10.2 automatically at login time, configure like follows.
[root@www ~]#
vi /etc/profile.d/rh-mariadb102.sh
# create new

source /opt/rh/rh-mariadb102/enable
export X_SCLS="`scl enable rh-mariadb102 'echo $X_SCLS'`"
[4] Enable MariaDB 10.2 and configure initial settings.
[root@www ~]#
vi /etc/opt/rh/rh-mariadb102/my.cnf.d/mariadb-server.cnf
# add follows into [mysqld] section

[root@www ~]#
systemctl start rh-mariadb102-mariadb

[root@www ~]#
systemctl enable rh-mariadb102-mariadb
[root@www ~]#


In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

# Enter
Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.

# set root password
Set root password? [Y/n] y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!

By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB 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
Remove anonymous users? [Y/n] y
 ... 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
Disallow root login remotely? [Y/n] y
 ... Success!

By default, MariaDB 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
Remove test database and access to it? [Y/n] y
 - 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
Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

# connect to MariaDB with root

[root@www ~]#
mysql -u root -p

Enter password:    
# MariaDB root password you set

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 16
Server version: 10.2.8-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

# show user list

MariaDB [(none)]>
select user,host,password from mysql.user;

| user | host      | password                                  |
| root | localhost | ***************************************** |
| root | | ***************************************** |
| root | ::1       | ***************************************** |
3 rows in set (0.00 sec)

# show database list

MariaDB [(none)]>
show databases;

| Database           |
| information_schema |
| mysql              |
| performance_schema |
3 rows in set (0.01 sec)

MariaDB [(none)]>

[5] If Firewalld is running and also MariaDB is used from remote Hosts, allow service like follows. MariaDB uses 3306/TCP.
[root@www ~]#
firewall-cmd --add-service=mysql --permanent

[root@www ~]#
firewall-cmd --reload

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