一、通过Yum命令安装
1.下载rpm安装源
官方地址：https://dev.mysql.com/downloads/repo/yum/
rpm文件地址：https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
1）通过wget命令下载文件
代码语言：javascript复制[root@localhost ~]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
--2018-01-08 16:57:46-- https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
正在解析主机 dev.mysql.com (dev.mysql.com)... 137.254.60.11
正在连接 dev.mysql.com (dev.mysql.com)|137.254.60.11|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 302 Found
位置：https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm [跟随至新的 URL]
--2018-01-08 16:57:48-- https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm
正在解析主机 repo.mysql.com (repo.mysql.com)... 23.1.165.122
正在连接 repo.mysql.com (repo.mysql.com)|23.1.165.122|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：25680 (25K) [application/x-redhat-package-manager]
正在保存至: “mysql57-community-release-el7-11.noarch.rpm”
100%[==================================================================================================================================================================================================>] 25,680 --.-K/s 用时 0.1s
2018-01-08 16:57:48 (232 KB/s) - 已保存 “mysql57-community-release-el7-11.noarch.rpm” [25680/25680])
[root@localhost ~]# 2.安装Mysql
1）安装Mysql源文件
yum localinstall -y mysql57-community-release-el7-11.noarch.rpm
2）查看Mysql源是否安装成功
代码语言：javascript复制[root@localhost ~]# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64 MySQL Connectors Community 42
mysql-tools-community/x86_64 MySQL Tools Community 55
mysql57-community/x86_64 MySQL 5.7 Community Server 227
[root@localhost ~]#3）安装Mysql服务
yum install -y mysql-community-server
4）查看Mysql服务是否安装成功
代码语言：javascript复制[root@localhost ~]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: inactive (dead)
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
[root@localhost ~]#3.启动Mysql
systemctl start mysqld
4.修改root登录密码
1）获取root默认密码（由于Mysql安全策略升级，安装完成后系统自动设置了一个随机密码）
代码语言：javascript复制[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log
2018-01-08T09:21:45.780623Z 1 [Note] A temporary password is generated for root@localhost: auw;Nj7J!j/J
[root@localhost ~]# 2）登录Mysql
代码语言：javascript复制[root@localhost ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.7.20
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> 3）修改密码
3.1）由于Mysql默认要求设置密码复杂度高（必须包含 大小写字母、数字、符号）
代码语言：javascript复制mysql> alter user 'root'@'localhost' identified by '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> 这样设置是合法的：
代码语言：javascript复制mysql> alter user 'root'@'localhost' identified by 'Mysql666!';
Query OK, 0 rows affected (0.00 sec)
mysql> 3.2）关闭Mysql密码校验规则，允许设置简单密码
3.2.1）在Mysql配置文件最后加入：validate_password = off
代码语言：javascript复制[root@localhost ~]# vi /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
validate_password = off
3.2.2）重启Mysql服务生效
systemctl restart mysqld
4）设置简单密码 :)
代码语言：javascript复制mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> 5.配置远程用户登录
1）指定Ip
代码语言：javascript复制mysql> grant all privileges on *.* to 'root'@'192.168.1.1' identified by '123456' with grant option;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> 2）允许所有
代码语言：javascript复制mysql> grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> 6.设置开机启动
systemctl enable mysqld
systemctl daemon-reload
7.其他
1）已配置远程访问权限，依然不能登录？请检查系统是否开启了防火墙。
1.1）CentOS关闭防火墙
systemctl stop firewalld.service
1.2）禁止防火墙开机启动
systemctl disable firewalld.service
2）Mysql客户端软件（推荐）
2.1）SQLyog（官网：https://sqlyog.en.softonic.com/）
2.2）Navicat（官网：https://www.navicat.com/en/）
