fedora26 安装 mysql

参考：

https://www.if-not-true-then-false.com/2010/install-mysql-on-fedoara-centos-red-hat-rhel/

进入root模式：

su -

安装yun源：

dnf install https://dev.mysql.com/get/mysql80-community-release-fc26-1.noarch.rpm

安装：

dnf install mysql-community-server

开启服务：

systemctl start mysqld.service ## use restart after update

systemctl enable mysqld.service

获取随机密码：

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

输出例如


2015-11-20T21:11:44.229891Z 1 [Note] A temporary password is generated for root@localhost: -et)QoL4MLid

密码就是：

QoL4MLid

Start MySQL Secure Installation with following command

/usr/bin/mysql_secure_installation

Output:

Securing the MySQL server deployment.

Enter password for user root: 

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

New password: 

Re-enter new 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: 0
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: 50 
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! 

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

连接：

mysql -u root -p

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

This example uses following parameters:

• DB_NAME = webdb
• USER_NAME = webdb_user
• REMOTE_IP = 10.0.15.25
• PASSWORD = password123
• PERMISSIONS = ALL

## CREATE DATABASE ##
mysql> CREATE DATABASE webdb;

## CREATE USER ##
mysql> CREATE USER 'webdb_user'@'10.0.15.25' IDENTIFIED BY 'password123';

## GRANT PERMISSIONS ##
mysql> GRANT ALL ON webdb.* TO 'webdb_user'@'10.0.15.25';

##  FLUSH PRIVILEGES, Tell the server to reload the grant tables  ##
mysql> FLUSH PRIVILEGES;