CentOS在线安装Mysql5.7

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

[root@localhost ~]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
---- ::--  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|:... 已连接。
已发出 HTTP 请求，正在等待回应...  Found
位置：https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm [跟随至新的 URL]
---- ::--  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|:... 已连接。
已发出 HTTP 请求，正在等待回应...  OK
长度： (25K) [application/x-redhat-package-manager]
正在保存至: “mysql57-community-release-el7-.noarch.rpm”

%[==================================================================================================================================================================================================>] ,      --.-K/s 用时 .1s    

-- :: ( KB/s) - 已保存 “mysql57-community-release-el7-.noarch.rpm” [/])

[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

[root@localhost ~]# yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64        MySQL Connectors Community
mysql-tools-community/x86_64             MySQL Tools Community
mysql57-community/x86_64                 MySQL 5.7 Community Server
[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

[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()
           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）

[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log
--08T09::.780623Z  [Note] A temporary password is generated for root@localhost: auw;Nj7J!j/J
[root@localhost ~]# 

2）登录Mysql

[root@localhost ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 5.7.

Copyright (c) , , 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）

mysql> alter user 'root'@'localhost' identified by '';
ERROR  (HY000): Your password does not satisfy the current policy requirements
mysql> 

这样设置是合法的：

mysql> alter user 'root'@'localhost' identified by 'Mysql666!';
Query OK,  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

[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 % of total RAM for dedicated server, else %.
# 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=

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 :)

mysql> alter user 'root'@'localhost' identified by '';
Query OK,  rows affected (0.00 sec)

mysql> 

5.配置远程用户登录

1）指定Ip

mysql> grant all privileges on *.* to 'root'@'192.168.1.1' identified by '' with grant option;
Query OK,  rows affected,  warning (0.00 sec)

mysql> 

2）允许所有

mysql> grant all privileges on *.* to 'root'@'%' identified by '' with grant option;
Query OK,  rows affected,  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/）