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
--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

[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

[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）

[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

[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）

mysql> alter user 'root'@'localhost' identified by 'Root@2018';
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）退出mysql ，编辑etc/my.cnf数据库Mysql配置文件，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 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）重新登陆mysql，设置简单密码 :)

mysql> alter user 'root'@'localhost' identified by 'root';
Query OK, 0 rows affected (0.00 sec)

mysql> 

5.配置远程用户登录

mysql> grant all privileges on *.* to 'root'@'%' identified by 'root' 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. 在阿里云控制台设置防火墙规则