原文链接：http://www.jb51.cc/article/p-qzrplfnn-xp.html
安装环境：CentOS7 64位 MINI版，安装MysqL5.7
1、配置YUM源
在 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
[root@localhost home]# yum repolist enabled | grep "MysqL.*-community.*"mysql-connectors-community/x86_64 MysqL Connectors Community 3
MysqL-tools-community/x86_64 MysqL Tools Community 4
MysqL57-community/x86_64 MysqL 5.7 Community Server 18
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
[root@localhost home]# systemctl status MysqLd MysqLd.service - MysqL Server Loaded: loaded (/usr/lib/systemd/system/MysqLd.service; enabled) Active: active (running) since 一 2017-06-26 21:23:21 EDT; 14s ago Docs: man:MysqLd(8) http://dev.MysqL.com/doc/refman/en/using-systemd.html Process: 21186 ExecStart=/usr/sbin/MysqLd --daemonize --pid-file=/var/run/MysqLd/MysqLd.pid $MysqLD_OPTS (code=exited,status=0/SUCCESS) Process: 21108 ExecStartPre=/usr/bin/MysqLd_pre_systemd (code=exited,status=0/SUCCESS) Main PID: 21190 (MysqLd) CGroup: /system.slice/MysqLd.service └─21190 /usr/sbin/MysqLd --daemonize --pid-file=/var/run/MysqLd/my... 6月 26 21:23:21 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：
或者
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：
set password for 'root'@'localhost'=password('208170'); ERROR 1819 (HY000): Your password does not satisfy the current policy requirements通过msyql环境变量可以查看密码策略的相关信息：
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 | aracters; dictionary file |
MysqL官网密码策略详细说明：http://dev.mysql.com/doc/refman/5.7/en/validate-password-options-variables.html#sysvar_validate_password_policy
修改密码策略 ( zhe ge di fang you dian wen ti bu yao cao zuo)
在/etc/my.cnf文件添加validate_password_policy配置，指定密码策略
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：
重新启动MysqL服务使配置生效：
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：
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：
重新启动MysqL服务，查看数据库默认编码如下所示：
MysqL> show variables like '%character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/MysqL/charsets/ |
+--------------------------+----------------------------+
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
shell> grep 'temporary password' /var/log/MysqLd.log [root@localhost home]# grep 'temporary password' /var/log/MysqLd.log 2017-06-27T01:23:00.805572Z 1 [Note] A temporary password is generated for root@localhost: tZ%*dP??j26h [root@localhost home]# MysqL -uroot -ptZ%*dP??j26h MysqL> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPasswd!';MysqL> set password for 'root'@'localhost'=password('208170');MysqL> show variables like '%password%';# 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=0validate_password = offsystemctl restart MysqLdMysqL> GRANT ALL PRIVILEGES ON *.* TO 'lhbing'@'%' IDENTIFIED BY '208170' WITH GRANT OPTION;[MysqLd]
character_set_server=utf8
init_connect='SET NAMES utf8'