Ubuntu18.04安装mysql5.7

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本文详细介绍了在Ubuntu系统上安装MySQL 5.7的过程，包括安装服务、客户端及依赖项，设置root用户密码，以及配置远程登录权限的方法。

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1.1安装

首先执行下面三条命令：

安装mysql服务

sudo apt-get install mysql-server

安装客户端

sudo apt install mysql-client

安装依赖

sudo apt install libmysqlclient-dev

检查状态

sudo netstat -tap | grep mysql

1.2设置root密码

mysql5.7安装完成后普通用户不能进mysql，原因：root的plugin被修改成了auth_socket，用密码登陆的plugin应该是mysql_native_password，直接用root权限登录就不用密码,修改root密码和登录验证方式：

$ sudo su
# mysql
mysql>
mysql> select user, plugin from mysql.user;
+------------------+-----------------------+
| user             | plugin                |
+------------------+-----------------------+
| root             | auth_socket           |
| mysql.session    | mysql_native_password |
| mysql.sys        | mysql_native_password |
| debian-sys-maint | mysql_native_password |
+------------------+-----------------------+
4 rows in set (0.00 sec)
mysql> update mysql.user set authentication_string=PASSWORD('123456'), plugin='mysql_native_password' where user='root';
mysql> flush privileges;
mysql> exit
Bye
# exit
$ sudo /etc/init.d/mysql restart
$ mysql -uroot -p

Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.22-0ubuntu18.04.1 (Ubuntu)

Copyright (c) 2000, 2018, 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>

1.3配置mysql远程登录

修改配置文件，注释掉bind-address = 127.0.0.1

$ sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

保存退出，然后进入mysql服务，执行授权命令：

$ mysql -uroot -p

mysql> grant all on . to root@’%’ identified by ‘123456’ with grant option;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> exit
Bye
$ sudo /etc/init.d/mysql restart