centos 安装mysql
yum -y install https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm
yum -y install mysql-community-server --nogpgcheck
systemctl start mysqld

查看初始密码

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

# 安全初始化
# mysql_secure_installation
[dnt@localhost ~]$ mysql_secure_installation
 
Securing the MySQL server deployment.
 
Enter password for user root:
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) : n
 
 ... 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) : 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!

MySQL 8.0 调整密码验证规则：

set global validate_password.policy=0;
set global validate_password.length=1;

create user dnt@‘%’ identified by ‘密码’;
grant all on 数据库.* to dnt;
flush privileges;

修改配置，运行远程登录

vim /etc/my.cnf
[mysqld]
bind-address=0.0.0.0 # 新增内容

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

查看一下防火墙状态

systemctl status firewalld

关闭防火墙

systemctl stop firewalld

重启MySQL

systemctl restart mysqld
#启动
systemctl start mysqld
#查看状态
systemctl status mysqld
#开机自启动
systemctl enable mysqld