Summary of remote connection of MySQL

Preface

MySQL It is one of the most popular databases , It is also the preferred database for persistent storage of small and medium-sized enterprises .

Different from our daily study , in application ,MySQL Services will be attached to a server . If MySQL Deployed on a cloud server , thus , To manipulate the database, you need to connect to the server first , Then enter the database operation , Not very convenient .

therefore , Learning remote connections MySQL The method of is a required course when the database is on the server .

But for the sake of safety ,MySQL The remote connection of is not easy with one click , Especially in MySQL8.x version , We will introduce .

preparation

At this stage , Make sure you have entered the database service you want to access remotely , The usual interface is as follows ：

Release remote host access

Generally speaking ,MySQL Only allow users to access on the local host . By inquiring user surface , You can also see the allowed host information ：

select host,user from mysql.user

host Below the field localhost Represents that only local hosts are accepted .

therefore , Our work is very clear , Is to modify the access permission information , Enable the specified user to accept remote access . Generally speaking , We have two ways to achieve this effect .

The first one is ： Change account permissions （ Suggest ）

Since the remote host has no permission to connect , We can go through GRANT Statement to modify the permissions of the specified user .

GRANT The syntax of the statement is roughly ：GRANT jurisdiction ON Database objects TO user .

Grant all permissions for all database operations to Any mainframe （’%’） Access to the root user , So any connected to the database root Users can access all information .

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY ' Your password ' WITH GRANT OPTION; 

Refresh the permissions ：

flush privileges;

Query again , You can find that a new record will be added ,host Field % Means any host ：

If you just want to grant A separate host Access right , be % It can be modified to the specified IP：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'172.16.28.71' IDENTIFIED BY 
' Your password ' WITH GRANT OPTION; 

The effect is similar to ：

Refresh the permissions ：

flush privileges;

The second kind ： Modified table method

Use GRANT Statement is to add a new record directly , I personally suggest doing it in the above way .

however , We can also adopt direct modification user by root Of host Field contents , Use it directly UPDATE Statement modification table ：

UPDATE mysql.user SET host = '%' WHERE user = 'root';

Refresh the permissions ：

flush privileges;

The effect is as shown in the picture , Directly modifying host field value , Instead of adding .

To this step , Most of the time , We can use database tools such as ：Web SQLyog、Navicat、Dbeaver Wait, connect to our remote database .

MySQL 8.x Points for attention

But please pay attention to , If your MySQL The version is 8.x Words , Due to the different ways of password encryption , The following prompt may appear when connecting ：

therefore , We have to Change the encryption method To achieve remote connection , Use ALTER sentence ：

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY ' Your password ';

Finally, don't forget to refresh permissions ：

flush privileges;

OK, This is the end of the tutorial , If you have any problems , Welcome to comment in the comment area

Reference resources

mysql Open remote connection