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MySQL 8.0 : Install2020/01/23

Install MySQL 8.0 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 8.0 is located on another PATH.
# install from SCLo

[root@www ~]#
yum --enablerepo=centos-sclo-rh -y install rh-mysql80-mysql-server
[root@www ~]#
vi /etc/opt/rh/rh-mysql80/my.cnf.d/mysql-server.cnf
# line 21: add default character-set

[root@www ~]#
systemctl enable --now rh-mysql80-mysqld

[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-mysql80 bash
[root@www ~]#
mysql -V

mysql Ver 8.0.17 for Linux on x86_64 (Source distribution)
[root@www ~]#
which mysql

[3] To enable MySQL 8.0 automatically at login time, configure like follows.
[root@www ~]#
vi /etc/profile.d/rh-mysql80.sh
# create new

source /opt/rh/rh-mysql80/enable
export X_SCLS="`scl enable rh-mysql80 'echo $X_SCLS'`"
[4] Enable MySQL 8.0 and Configure initial settings.
[root@www ~]#

Securing the MySQL server deployment.

Connecting to MySQL using a blank password.

VALIDATE PASSWORD COMPONENT can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD component?

# enable password validation policy or not
Press y|Y for Yes, any other key for No: y

There are three levels of password validation policy:

LOW    Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary file

# select password validation policy if enabled
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 0
Please set the password for root here.

# set MySQL root password
New password:

Re-enter new password:

# confirmation of the password you input
Estimated strength of the password: 100
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
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

# remove anonymous users or not
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y

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 or not
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y

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

# remove test database or not
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y
 - Dropping test database...

 - Removing privileges on test database...

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

# reload privilege tables or not
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y

All done!

# connect to MySQL with root

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

Enter password:    
# password you set

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.17 Source distribution

Copyright (c) 2000, 2019, 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

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

# show user list
mysql> select user,host from mysql.user; 
| user             | host      |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
4 rows in set (0.00 sec)

# show database list
mysql> show databases; 
| Database           |
| information_schema |
| mysql              |
| performance_schema |
| sys                |
4 rows in set (0.01 sec)

# create test database
mysql> create database test_database; 
Query OK, 1 row affected (0.11 sec)

# create test table on test database
mysql> create table test_database.test_table (id int, name varchar(50), address varchar(50), primary key (id)); 
Query OK, 0 rows affected (0.42 sec)

# insert data to test table
mysql> insert into test_database.test_table(id, name, address) values("001", "CentOS", "Hiroshima"); 
Query OK, 1 row affected (0.04 sec)

# show test table
mysql> select * from test_database.test_table; 
| id | name   | address   |
|  1 | CentOS | Hiroshima |
1 row in set (0.00 sec)

# delete test database
mysql> drop database test_database; 
Query OK, 1 row affected (0.27 sec)

mysql> exit
[5] If Firewalld is running and also you allow to access MySQL Server from remote Hosts, allow service. MySQL uses [3306/TCP].
[root@www ~]#
firewall-cmd --add-service=mysql --permanent

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

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