Note: If you are upgrading MySQL (from earlier version), then make sure that you backup (dump and copy) your database and configs. And remember run mysql_upgrade command.

Top Mysql 8.0 Features:

1. SQL Window functions, Common Table Expressions, NOWAIT and SKIP LOCKED, Descending Indexes, Grouping, Regular Expressions, Character Sets, Cost Model, and Histograms.
   
2. JSON Extended syntax, new functions, improved sorting, and partial updates. With JSON table functions you can use the SQL machinery for JSON data.
3. GIS Geography support. Spatial Reference Systems (SRS), as well as SRS aware spatial datatypes, spatial indexes, and spatial functions.
   
4. Reliability DDL statements have become atomic and crash safe, meta-data is stored in a single, transactional data dictionary. Powered by InnoDB!
   
5. Observability Significant enhancements to Performance Schema, Information Schema, Configuration Variables, and Error Logging.
6. Manageability Remote management, Undo tablespace management, and new instant DDL.
7. Security OpenSSL improvements, new default authentication, SQL Roles, breaking up the super privilege, password strength, and more.
8. Performance InnoDB is significantly better at Read/Write workloads, IO bound workloads, and high contention “hot spot” workloads. Added Resource Group feature to give users an option optimize for specific workloads on specific hardware by mapping user threads to CPUs.

Install MySQL Database 8.0.13/5.7.23 on Fedora 28/29, CentOS 7.5/6.10, Red Hat (RHEL) 7.6/6.10

1. Change root user

su -
## OR ##
sudo -i

2. Install MySQL YUM repository

Fedora

## Fedora 28 ##
dnf install https://dev.mysql.com/get/mysql80-community-release-fc28-1.noarch.rpm

## Fedora 29 ##
dnf install https://dev.mysql.com/get/mysql80-community-release-fc29-1.noarch.rpm

CentOS and Red Hat (RHEL)

## CentOS 7 and Red Hat (RHEL) 7 ##
yum localinstall https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

## CentOS 6 and Red Hat (RHEL) 6 ##
yum localinstall https://dev.mysql.com/get/mysql80-community-release-el6-1.noarch.rpm

3a. Update or Install MySQL 8.0.13

Fedora 28/29

dnf install mysql-community-server

CentOS 7.5/6.10 and Red Hat (RHEL) 7.6/6.10

yum install mysql-community-server

4. Start MySQL server and autostart MySQL on boot

Fedora 28/29 and CentOS 7.5 and Red Hat (RHEL) 7.6/7.5

systemctl start mysqld.service 

systemctl enable mysqld.service

CentOS 6.10 and Red Hat (RHEL) 6.10

/etc/init.d/mysql start ## use restart after update
## OR ##
service mysql start ## use restart after update

chkconfig --levels 235 mysqld on

5. Get Your Generated Random root Password

grep 'A temporary password is generated for root@localhost' /var/log/mysqld.log |tail -1

Example Output:

And root password is: fQGM*ec61-s#

you can Keep this password if you like :

6. MySQL Secure Installation

• Change root password
• Remove anonymous users
• Disallow root login remotely
• Remove test database and access to it
• Reload privilege tables

Start MySQL Secure Installation with following command

/usr/bin/mysql_secure_installation

[root@osrdarFedora ~]# mysql_secure_installation

Securing the MySQL server deployment.

Enter password for user root:   #( please   insert the password found in logs  Above) 

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


Re-enter new password:
The 'validate_password' component is installed on the server.
The subsequent steps will run with the existing configuration
of the component.
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) : Y

New password:

Re-enter new password:

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
environment.

Remove anonymous users? (Press y|Y for Yes, any other key for No) : 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? (Press y|Y for Yes, any other key for No) : 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 and access to it? (Press y|Y for Yes, any other key for No) : 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 now? (Press y|Y for Yes, any other key for No) : y
Success.

All done!
[root@osrdarFedora ~]#

Note: If you don’t want some reason, do a “MySQL Secure Installation” then at least it’s very important to change the root user’s password

mysqladmin -u root password [your_password_here]

## Example ##
mysqladmin -u root password myownsecrectpass

7. Connect to MySQL database (localhost) with password

mysql -u root -p

## OR ##
mysql -h localhost -u root -p

8. Create Database, Create MySQL User and Enable Remote Connections to MySQL Database

This example uses following parameters:

• DB_NAME = osradar
• USER_NAME = osradar_user
• PASSWORD = 1234567@@@Osradar
• PERMISSIONS = ALL

## CREATE DATABASE ##
mysql> CREATE DATABASE osradar;

## CREATE USER ##
mysql> CREATE USER 'osradar_user'@'localhost' IDENTIFIED BY '123456@@@Osradar'
-> ;
Query OK, 0 rows affected (0.05 sec)
# Grant Access 
mysql> GRANT ALL ON osradar.* TO 'osradar_user'@'localhost'; Query OK, 0 rows affected (0.04 sec)
mysql> flush Privileges;

Verify The USER mysql access:

[root@osrdarFedora ~]# mysql -u osradar_user -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 23
Server version: 8.0.13 MySQL Community Server - GPL

Copyright (c) 2000, 2018, 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.

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| osradar |
+--------------------+
2 rows in set (0.00 sec)

mysql>

Enable Remote Connection to MariaDB Server –> Open MySQL Port (3306) on Iptables Firewall (as root user again)

1. Fedora 28/29 and CentOS/Red Hat (RHEL) 7.6

1.1 Add New Rule to Firewalld

firewall-cmd --permanent --zone=public --add-service=mysql

## OR ##

firewall-cmd --permanent --zone=public --add-port=3306/tcp

1.2 Restart firewalld.service

systemctl restart firewalld.service

2. CentOS/Red Hat (RHEL) 6.10

2.1 Edit /etc/sysconfig/iptables file:

nano -w /etc/sysconfig/iptables

2.2 Add following INPUT rule:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

2.3 Restart Iptables Firewall:

service iptables restart
## OR ##
/etc/init.d/iptables restart

3. Test remote connection

mysql -h IP -u myusername -p  

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