Ubuntu18.04配置mysql

• mysql的安装：

# 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

• 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,authentication_string,password_expired from mysql.user;

+------------------+-----------------------+-------------------------------------------+------------------+
| user | plugin | authentication_string | password_expired |
+------------------+-----------------------+-------------------------------------------+------------------+
| root | mysql_native_password | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | N |
| mysql.session | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | N |
| mysql.sys | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | N |
| debian-sys-maint | mysql_native_password | *B00D3DE7AAD236F08252656910A6014B23E7BCD0 | N |
| root | mysql_native_password | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | N |
+------------------+-----------------------+-------------------------------------------+------------------+

mysql> update mysql.user set authentication_string=PASSWORD('root'), plugin='mysql_native_password' where user='root'; #将root用户的密码修改为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>

修改后的效果如下：

• 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; #登陆的密码：123456
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> flush privileges; #刷新数据库
Query OK, 0 rows affected (0.00 sec)
 
mysql> exit
Bye
$ sudo /etc/init.d/mysql restart #重启mysql服务

配置完后，就可以在navcat等工具中访问数据库了。