• MySQL安装--yum

1. 查看是否已经安装了MySQL,命令:yum list installed|grep mysql或rpm -qa|grep -i mysql

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2. 查看yum库mysql版本信息(电脑需正常联网),命令:yum list|grep mysql或yum -y list mysql*

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3. yum命令安装mysql及其服务,命令yum -y install mysql-server mysql mysql-devel

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4. 查看安装结果,命令:rpm -qi mysql-server

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5. 解决mysql-service,没有yum命令下,无可用包的问题(CentOS 7 版本将MySQL数据库软件从默认的程序列表中移除，用mariadb代替了)

wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum install mysql-community-server

• MySQL安装--rpm

  MySQL官网:https://www.mysql.com/
  官网下载地址:https://dev.mysql.com/downloads/mysql/

1. 选择系统,查看mysql数据

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2. 查看系统版本&位数cat /etc/redhat-release&getconf LONG_BIT

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3. 选择mysql下载

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4. 将下载好的文件ftp到服务器上并解包,参考https://www.jianshu.com/p/27bec7340f61

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5. rpm命令安装MySQl的服务端,客户端,开发库这三个包,min命令:

rpm -ivh mysql-community-server-5.7.20-1.el7.x86_64.rpm --nodeps
rpm -ivh mysql-community-client-5.7.20-1.el7.x86_64.rpm --nodeps
rpm -ivh mysql-community-devel-5.7.20-1.el7.x86_64.rpm --nodeps
rpm -ivh mysql-community-common-5.7.20-1.el7.x86_64.rpm --nodeps
rpm -ivh mysql-community-libs-5.7.20-1.el7.x86_64.rpm --nodeps
rpm -ivh mysql-community-libs-compat-5.7.20-1.el7.x86_64.rpm --nodeps

6. 查看安装结果，命令：rpm -qa|grep -i mysql

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7. 启动mysql,命令:service mysqld start或systemctl start mysqld并查看启动结果systemctl status mysqld;
   设置开机启动命令

   systemctl enable mysqld
   systemctl daemon-reload
   

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8. 查看初始密码,文件路径 /var/log/mysqld.log,并记下

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9. 修改初始密码命令:mysql -uroot -p之后输入:ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码';或set password for 'root'@'localhost'=password('新密码');

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10. 退出(exit或quit)并用新密码登录mysql(mysql -u root -p)

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11. 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，添加一个新的帐户：GRANT ALL PRIVILEGES ON *.* TO 'usrname'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;

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12. 新用户登录mysql -u usrname -p

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13. 配置utf-8编码
    修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置

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

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14. 重启mysql,使配置生效systemctl restart mysqld

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15. 查看配置结果show variables like '%character%';

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16. 常用文件路径:
    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