CentOS 7
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Install MySQL 5.6
2016/07/05
 
Install MySQL 5.6 to configure Database Server.
[1] It's possible to install from CentOS SCLo Software Collections.
It's OK to install it even if MariaDB is already installed because MySQL 5.6 is located on another PATH.
# install from SCLo

[root@www ~]#
yum --enablerepo=centos-sclo-rh -y install rh-mysql56-mysql-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-mysql56 bash
[root@www ~]#
mysql -V

mysql Ver 14.14 Distrib 5.6.26, for Linux (x86_64) using EditLine wrapper
[root@www ~]#
which mysql

/opt/rh/rh-mysql56/root/usr/bin/mysql
[3] To enable MySQL 5.6 automatically at login time, configure like follows.
[root@www ~]#
vi /etc/profile.d/rh-mysql56.sh
# create new

#!/bin/bash

source /opt/rh/rh-mysql56/enable
export X_SCLS="`scl enable rh-mysql56 'echo $X_SCLS'`"
[4] Enable MySQL 5.6 and Configure initial settings.
[root@www ~]#
vi /etc/opt/rh/rh-mysql56/my.cnf.d/mysql-server.cnf
# add follows within [mysqld] section

[mysqld]
character-set-server=utf8
[root@www ~]#
systemctl start rh-mysql56-mysqld

[root@www ~]#
systemctl enable rh-mysql56-mysqld

[root@www ~]#
mysql_secure_installation


NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

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

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 MySQL
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 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

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, 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

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 MySQL
installation should now be secure.

Thanks for using MySQL!

[root@www ~]#
mysql -u root -p
   
# connect to MySQL with root

Enter password:    
# password you set

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.6.26 MySQL Community Server (GPL)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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

# show user list

mysql>
select user,host,password from mysql.user;

+------+-----------+-------------------------------------------+
| user | host      | password                                  |
+------+-----------+-------------------------------------------+
| root | localhost | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| root | 127.0.0.1 | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| root | ::1       | *xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
+------+-----------+-------------------------------------------+
3 rows in set (0.00 sec)

# show database list

mysql>
show databases;

+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

mysql>
exit

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

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

success
 
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