如何在Ubuntu 18.04系统中安装mysql5.7

如何在Ubuntu 18.04系统中安装mysql5.7？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

具体内容如下

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# mysqlmysql>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> exitBye# exit$ sudo /etc/init.d/mysql restart$ mysql -uroot -pEnter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2Server 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 itsaffiliates. Other names may be trademarks of their respectiveowners.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 -pmysql> 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> exitBye$ sudo /etc/init.d/mysql restart

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