CentOS 7 安装mysql

1、配置yum源

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.*"

2、安装MySQL

shell> yum install mysql-community-server

3、启动MySQL服务

shell> systemctl start mysqld

mysqld查看MySQL的启动状态

shell> systemctl status mysqld   #状态如下↓↓↓↓↓

 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：

shell> grep 'temporary password' /var/log/mysqld.log

shell> mysql -uroot -p

  　Enter password: ?aeq,W;i7cnZ

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 或者

mysql> set password for 'root'@'localhost'=password('MyNewPass4!'); 

 注意：mysql5.7以上版本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：

 

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