更换yum源地址(阿里云不需要更换源)

• 备份

  mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
  

• 更换源

  wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  

• 生成缓存

  yum makecache
  

安装Mysql8

• 在centos启用Mysql yum存储库

  rpm -Uvh https://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm
  

• 安装mysql8社区服务器（由于mysql yum存储库具有用于多个版本的mysql存储库配置，因此需要禁用mysql repo文件中的所有存储库）

  sed -i ‘s/enabled=1/enabled=0/‘ /etc/yum.repos.d/mysql-community.repo
  

• 安装mysql80

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

• 查看mysql的状态

  service mysqld status
  

• 启动mysql服务

  service mysqld start
  

• 查询mysql的默认密码(安装的过程中，会给root账号授予一个临时密码,该密码用于修改真实的密码)

  grep "A temporary password" /var/log/mysqld.log
  

• mysql安全安装

  mysql_secure_installation
  

  提示输入当前的密码

  Enter password for user root:
  

  在上方输入临时密码，安装Enter。将提示一下信息

  The existing password for the user account root has expired. Please set a new password.
  
  New password:
  Re-enter new password:
  

  需要为root账户输入两次新的密码。默认输入yes（y）

  Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
  
  Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y
  
  Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y
  
  Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y
  

• 重启mysql服务

  service mysqld restart
  

• 设置开机自启动

  chkconfig mysqld on
  

• 设置远程访问

  mysql> use mysql;
  

  查看user用户

  mysql> select user,host from user;
  +------------------+-----------+
  | user             | host      |
  +------------------+-----------+
  | mysql.infoschema | localhost |
  | mysql.session    | localhost |
  | mysql.sys        | localhost |
  | root             | localhost |
  +------------------+-----------+
  

  创建root远程用户(输入你的password)

  mysql> create user ‘root‘@‘%‘ identified by ‘yourpassword‘;
  

  授权用户可以远程登陆

  mysql> grant all on *.* to ‘root‘@‘%‘;
  

  修改加密方式（输入你的password)

  mysql> alter user ‘root‘@‘%‘ identified with mysql_native_password by ‘yourpassword‘;
  

  刷新权限

  mysql> flush privileges;
  

  查看防火墙状态

  systemctl status firewalld
  

  开启防火墙

  systemctl start firewalld
  

  添加端口号

  firewall-cmd --zone=public --add-port=3306/tcp --permanent
  

  刷新重置

  firewall-cmd --reload
  

阿里云服务器需要进入到网页系统中，开启安全组中的端口3306

centos安装Mysql