Centos7配置Mysql5.7数据库

1. 安装wget指令

   [root@localhost opt]# yum -y install wget
   

2. 在线下载Mysql安装源

   [root@localhost opt]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
   

3. 安装Mysql安装源

   [root@localhost opt]# yum -y localinstall mysql57-community-release-el7-11.noarch.rpm 
   

4. 在线安装Mysql

   [root@localhost opt]# yum -y install mysql-community-server
   

5. 启动Mysql服务

   [root@localhost opt]# systemctl start mysqld
   

6. 设置开机启动

   [root@localhost opt]# systemctl enable mysqld
   [root@localhost opt]# systemctl daemon-reload
   

7. 修改root登录密码

   # mysql安装完成之后，会在/var/log/mysqld.log文件中给root生成了一个临时的默认密码
   [root@localhost opt]# cat /var/log/mysqld.log
   
   # A temporary password is generated for root@localhost: hNR?y3TWzct1(密码)
   

8. 登录Mysql

   [root@localhost opt]# mysql -u root -p
   # 粘贴上述密码
   

9. 修改mysql默认密码策略

   # mysql5.7默认密码策略要求密码必须是大小写字母数字特殊字母的组合，至少8位
   mysql> set global validate_password_policy=0;
   # 修改密码，此时默认密码长度为8
   mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '12345678';
   # 查看密码长度
   mysql> select @@validate_password_length;
   +----------------------------+
   | @@validate_password_length |
   +----------------------------+
   |                          8 |
   +----------------------------+
   1 row in set (0.00 sec)
   # 设置密码长度
   mysql> set global validate_password_length=1;
   Query OK, 0 rows affected (0.00 sec)
   
   mysql> select @@validate_password_length;
   +----------------------------+
   | @@validate_password_length |
   +----------------------------+
   |                          4 |
   +----------------------------+
   1 row in set (0.00 sec)
   # 再次修改密码
   mysql>  ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
   Query OK, 0 rows affected (0.00 sec)
   
   

10. 退出Mysql

    mysql> exit
    

Mysql 5.7 开放端口允许远程登录、修改编码为UTF-8

• 设置允许远程登录

  mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
  

• 防火墙开放端口3306

  [root@localhost opt]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
  [root@localhost opt]# firewall-cmd --reload
  

• 配置Mysql默认编码UTF-8

  # 修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置
  character_set_server=utf8
  init_connect='SET NAMES utf8'
  # 保存并退出
  # 重启mysql服务
  [root@localhost opt]# systemctl restart mysqld