Ubuntu18.04 安装MySQL57

1.1安装：　

　　首先智行下面3条命令：

　　安装MySQL服务：

　　sudo apt-get install mysql-server

　　安装客户端：

　　sudo apt install mysql-client

　　安装依赖包：

　　sudo apt install libmysqlclient-dev

　　检查安装状态:

　　sudo netstat -tap |grep mysql

1.2设置root密码：

　　MySQL在安装完成后普通用户不能进入MySQL，原因是：root的plugin被修改成了auth_socket，用面登陆的plugin应是：mysql_native_passwors，直接用root权限就不需要密码，登录后修改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> select user, plugin from mysql.user;
+------------------+-----------------------+
| user | plugin |
+------------------+-----------------------+
| root | mysql_native_password |
| mysql.session | mysql_native_password |
| mysql.sys | mysql_native_password |
| debian-sys-maint | mysql_native_password |
+------------------+-----------------------+

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)

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，并注释掉bind-address = 127.0.0.1

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

　　保存退出，然后进入mysql，执行授权命令：

$ mysql -uroot -p 
　　mysql> grant all on *.* to root@'%' identified by '123456' with grant option;    #其中123456是自己刚设置的登录密码，不要复制，否则登录密码是123456
　　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