Linux下MySQL5.7安装与配置(YUM)
原文链接:http://blog.csdn.net/xyang81/article/details/51759200
安装环境:CentOS7 64位 MINI版,安装MySQL5.7

1、配置YUM源

MySQL官网中下载YUM源rpm安装包: http://dev.mysql.com/downloads/repo/yum/ 
 
 
# 下载mysql源安装包
shell> wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
# 安装mysql源
shell> yum localinstall mysql57-community-release-el7-8.noarch.rpm
检查mysql源是否安装成功
shell> yum repolist enabled | grep "mysql.*-community.*"
 
看到上图所示表示安装成功
 
 

2、安装MySQL

shell> yum install mysql-community-server

 

3、启动MySQL服务

shell> systemctl start mysqld
 
查看MySQL的启动状态
 
shell> 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.

 

4、开机启动

 
shell> systemctl enable mysqld
shell> systemctl daemon-reload
 

5、修改root默认密码

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:
shell> grep 'temporary password' /var/log/mysqld.log
 
 
shell> mysql -uroot -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
或者
mysql> set password for 'root'@'localhost'=password('MyNewPass4!');
注意:mysql5.7默认安装了密码安全检查插件(validate_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%';
 
validate_password_policy:密码策略,默认为MEDIUM策略 
validate_password_dictionary_file:密码策略文件,策略为STRONG才需要  validate_password_length:密码最少长度 
validate_password_mixed_case_count:大小写字符长度,至少1个  validate_password_number_count :数字至少1个 
validate_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 LOW
Length
1 or MEDIUM
Length; numeric, lowercase/uppercase, and special characters
2 or STRONG
Length; numeric, lowercase/uppercase, and special characters; dictionary file
 
 

修改密码策略

在/etc/my.cnf文件添加validate_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 
validate_password_policy=0
 
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:
validate_password = off
 
重新启动mysql服务使配置生效:
systemctl restart mysqld
 

6、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;
 
7、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

 

 

 

转载请注明原文链接:Linux下MySQL5.7安装与配置(YUM)

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