CentOS7 64位下MySQL5.7安装与配置(YUM)

2019.09.06

安装环境:CentOS7 64位 MINI版,安装MySQL5.7

配置YUM源

  • 下载mysql源安装包
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
  • 安装mysql源
 yum localinstall mysql57-community-release-el7-8.noarch.rpm
  • 检查mysql源是否安装成功
yum repolist enabled | grep "mysql.*-community.*"

看到上图所示表示安装成功。

  • 可以修改vim /etc/yum.repos.d/mysql-community.repo源,改变默认安装的mysql版本。比如要安装5.6版本,将5.7源的enabled=1改成enabled=0。然后再将5.6源的enabled=0改成enabled=1即可。改完之后的效果如下所示:


安装MySQL

yum install mysql-community-server

启动MySQL服务

systemctl start mysqld
  • 查看MySQL的启动状态
systemctl status mysqld
 mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)
   Active: active (running) since 五 2016-06-24 04:37:37 CST; 35min ago
 Main PID: 2888 (mysqld)
   CGroup: /system.slice/mysqld.service
           └─2888 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
6月 24 04:37:36 localhost.localdomain systemd[1]: Starting MySQL Server...
6月 24 04:37:37 localhost.localdomain systemd[1]: Started MySQL Server.

开机启动

systemctl enable mysqld
systemctl daemon-reload

修改root本地登录密码

  • mysql安装完成之后,在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码,然后登录mysql进行修改:
grep 'temporary password' /var/log/mysqld.log

mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 
#或者
mysql> set password for 'root'@'localhost'=password('MyNewPass4!');

mysql5.7默认安装了密码安全检查插件(valimodify_date_password),默认密码检查策略要求密码必须包含:大小写字母、数字和特殊符号,并且长度不能少于8位。否则会提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements错误,如下图所示:

通过msyql环境变量可以查看密码策略的相关信息:

mysql> show variables like '%password%';

valimodify_date_password_policy:密码策略,默认为MEDIUM策略 
valimodify_date_password_dictionary_file:密码策略文件,策略为STRONG才需要 
valimodify_date_password_length:密码最少长度 
valimodify_date_password_mixed_case_count:大小写字符长度,至少1个 
valimodify_date_password_number_count :数字至少1个 
valimodify_date_password_special_char_count:特殊字符至少1个 

上述参数是默认策略MEDIUM的密码检查规则

  • 共有以下几种密码策略:
策略检查规则
0 or LOWLength
1 or MEDIUMLength; numeric, lowercase/uppercase, and special characters
2 or STRONGLength; numeric, lowercase/uppercase, and special characters; dictionary file

MySQL官网密码策略详细说明: http://dev.mysql.com/doc/refman/5.7/en/valimodify_date-password-options-variables.html#sysvar_validate_password_policy

  • 修改密码策略
  • /etc/my.cnf文件添加valimodify_date_password_policy配置,指定密码策略
  • 选择0(LOW),1(MEDIUM),2(STRONG)其中一种,选择2需要提供密码字典文件
valimodify_date_password_policy=0 / 1 / 2
  • 如果不需要密码策略,添加my.cnf文件中添加如下配置禁用即可:
valimodify_date_password = off
  • 重新启动mysql服务使配置生效:
systemctl restart mysqld

添加远程登录用户

默认只允许root帐户在本地登录,如果要在其它机器上连接mysql,必须修改root允许远程连接,或者添加一个允许远程连接的帐户,为了安全起见,我添加一个新的帐户:

mysql> GRANT ALL PRIVILEGES ON *.* TO 'yangxin'@'%' IDENTIFIED BY 'Yangxin0917!' WITH GRANT OPTION;

配置默认编码为utf8

修改/etc/my.cnf配置文件,在[mysqld]下添加编码配置,如下所示:

[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'

重新启动mysql服务,查看数据库默认编码如下所示:


默认配置文件路径:

配置文件:/etc/my.cnf 
日志文件:/var/log//var/log/mysqld.log 
服务启动脚本:/usr/lib/systemd/system/mysqld.service 
socket文件:/var/run/mysqld/mysqld.pid

具体参考:http://www.linuxidc.com/Linux/2016-09/135288.htm


权限

  • 给root用户授予从任何机器上登陆mysql服务器的权限:
mysql> grant all privileges on *.* to 'root'@'%' identified by '你的密码' with grant option;
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)