安装包下载

https://dev.mysql.com/downloads/mysql/
根据系统版本下载

安装新版mysql前，需将系统自带的mariadb-lib卸载

[root@hadoop ~]# rpm -qa|grep mariadb
mariadb-libs-5.5.52-1.el7.x86_64
[root@hadoop ~]# rpm -e --nodeps mariadb-libs-5.5.52-1.el7.x86_64
[root@hadoop ~]# rpm -qa|grep mariadb

解压安装包

tar -xvf mysql-5.7.20-1.el7.x86_64.rpm-bundle.tar

安装

mysql-community-common-5.7.20-1.el7.x86_64.rpm

rpm -ivh mysql-community-common-5.7.20-1.el7.x86_64.rpm

mysql-community-libs-5.7.20-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-5.7.20-1.el7.x86_64.rpm

mysql-community-client-5.7.20-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.20-1.el7.x86_64.rpm 

mysql-community-server-5.7.20-1.el7.x86_64.rpm

在安装之前需要安装libaio

[root@hadoop app]# rpm -qa|grep libaio
libaio-0.3.109-13.el7.x86_64

如果不存需要下载离线包：
http://mirror.centos.org/centos/6/os/x86_64/Packages/

安装libaio库：

rpm -ivh libaio-0.3.107-10.el6.x86_64.rpm（若在有网情况下可执行yum install libaio）

安装server

rpm -ivh mysql-community-server-5.7.20-1.el7.x86_64.rpm

初始化数据库

// 指定datadir, 执行后会生成~/.mysql_secret密码文件（5.7以后不在使用）
[root@slave mytmp]# mysql_install_db --datadir=/var/lib/mysql

// 初始化，执行生会在/var/log/mysqld.log生成随机密码
[root@slave mytmp]# mysqld --initialize

更改mysql数据库目录的所属用户及其所属组（没用创建mysql用户）

chown mysql:mysql /var/lib/mysql -R

启动mysql

systemctl start mysqld.service

问题分析

Process: 5924 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=1/FAILURE)

跟踪日志/var/log/mysqld.log

授权

chmod -R 777 mysql

查看效果

登录到mysql，更改root用户的密码

命令可以查看初始密码

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

set password=password('123456a?');

创建用户，及作权限分配

CREATE USER 'sunld'@'%' IDENTIFIED BY '123456a?'; 

GRANT ALL PRIVILEGES ON *.* TO 'sunld'@'%';

flush privileges;

远程登陆授权

grant all privileges on *.* to 'root'@'%' identified by '123456a?' with grant option;

flush privileges;

设置mysql开机启动

// 检查是否已经是开机启动
systemctl list-unit-files | grep mysqld

// 开机启动
systemctl enable mysqld.service

默认配置文件路径：

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

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'