$wget ‘https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm‘
$sudo rpm -Uvh mysql57-community-release-el7-11.noarch.rp

#yum-config=manager 工具安装

yum -y install yum-utils

yum-config-manager --disable mysql57-community

yum-config-manager --enable mysql56-community

yum install mysql-community-server

 vi /etc/my.cnf

service mysqld start
service mysqld stop

grep ‘temporary password‘ /var/log/mysqld.log

mysql_secure_installation

Securing the MySQL server deployment.
Enter password for user root:  ##输入上面的临时root密码
The existing password for the user account root has expired. Please set a new password.
New password: ##设置新密码
Re-enter new password:  ##重复密码
The ‘validate_password‘ plugin is installed on the server.
The subsequent steps will run with the existing configuration
of the plugin.
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) : #是否更改root密码
 ... skipping.
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) : ##是否移除匿名用户
 ... skipping.
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 ##是否禁止root远程登录
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 ##是否删除测试数据库
 - 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 ##是否立即刷新权限
Success.

All done!

mysql -uroot -p

create database if not exists databasename default character set utf8 collate utf8_unicode_ci;
create user username@‘%‘ IDENTIFIED BY ‘!@#$%^1234‘;
flush privileges; 

grant all privileges on databasename.* to username@localhost identified by ‘!@#$%^1234‘;
flush privileges;

mysql -u username -p

vim /etc/my.cnf  　　#修改配置文件
[mysqld]
bind-address=0.0.0.0

#端口加入防火墙
grant all privileges on databasename.* to ‘username‘@‘%‘ identified by ‘!@#$%^1234‘;
flush privileges;