Installing MySQL Server on CentOS 7 / CentOS 6

This guide is to help you with Installing MySQL Server on CentOS 7 / CentOS 6. I’ll show you how to install MySQL 5.5/5.6/5.7 and the latest stable release of MySQL, which as of this writing is MySQL 8.0

To start installing MySQL server on CentOS 7/6, you need to add the official MySQL community repository to your system. Run below commands to add it,

sudo yum localinstall https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

Install MySQL 8 on CentOS

Now that repo is added, you can install MysQL 8 without editing repository content since repo for 8 is enabled by default.

sudo yum --enablerepo=mysql80-community install mysql-community-server

Install MySQL 5.7 on CentOS

To install MySQL 5.7, you need to disable mysql80-community repository then download it.

sudo yum --disablerepo=mysql80-community --enablerepo=mysql57-community install mysql-community-server

Install MySQL 5.6 on CentOS

To install MySQL 5.6, you need to disable mysql80-community repository then download it.

sudo yum --disablerepo=mysql80-community --enablerepo=mysql56-community install mysql-community-server

Start MySQL Service

For CentOS 7, use systemd to start mysql service:

sudo systemctl enable  --now mysqld.service

For CentOS 6, use service command line tool.

sudo /etc/init.d/mysql start 
sudo chkconfig --levels 235 mysqld on

Set MySQL root password

Installation of MySQL on CentOS 6 generates a temporary password for you. You can get it by running:

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

It will look like below:

# root@localhost: ?h(UwcrvQ7jr

Change mysql root user password

# mysqladmin -u root password [your_password_here]
or
# mysql_secure_installation

Configure Firewall

With iptables:

sudo iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
sudo service iptables restartt

Firewalld:

sudo firewall-cmd --add-service mysql --permanent
sudo firewall-cmd --reload

Test your settings:

$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.22 MySQL Community Server (GPL)

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

mysql> show databases;