Instalando o MySQL no CentOS 7

Primeiro devemos remover o MariaDB, que ficou como servidor de banco de dados oficial do CentOS após a compra do MySQL pela Oracle.

# yum remove mariadb

Agora vamos colocar a mão na massa!

1- Adcionando repositório:

# wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm

2- Adicionando o repositŕoi a plataforma:

# yum localinstall mysql57-community-release-el7-7.noarch.rpm

3- Verificando se o repostório esta instalado:

# yum repolist enabled | grep "mysql.*-community.*"

4- Intalando a ultima versão do MYSQL:

yum install mysql-community-server

5- Iniciando o MYSQL:

# service mysqld start

# service mysqld status

6- Verificando a versão que foi instalada:

# mysql --version

7- Instalação segura do MYSQL:

Verifianco a senha temporaria do MYSQL

# grep 'temporary password' /var/log/mysqld.log

Iniciando a instlação segura:

# mysql_secure_installation

Quando solicitado insira a senha temporaria para iniciar a configuração do sistema.

Securing the MySQL server deployment.
Enter password for user root: Enter New Root Password
VALIDATE PASSWORD PLUGIN 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 plugin?
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
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 2
Using existing password for root.
Estimated strength of the password: 50 
Change the password for root ? ((Press y|Y for Yes, any other key for No) : y
New password: Set New MySQL Password
Re-enter new password: Re-enter New MySQL 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! 

8- Conectando ao MYSQL SERVER:

# mysql -u root -p 

9 – Atualizando o MYSQL com yum:

# yum update mysql-server

Como alterar a senha root MYSQL quando você sabe a senha root:

 # mysql -u root mysql -p SUASENHA
 # use mysql;
 # UPDATE user SET Password=PASSWORD('SENHA_SECNET') WHERE User='root'; 
 # FLUSH PRIVILEGES;
 # exit;