How to use the nginx proxy to access the mysql or oracle database on the internal network from the external network

        During project development and deployment, MySQL or Oracle databases are often installed on the intranet, but our application services can only be deployed on the external network. What if the external network service accesses the database connected to the internal network? This time, we will introduce how to access the intranet database from the external network through Nginx configuration.

1. Front-end server

        First of all, it is necessary to ensure that there is a front-end processor server that can not only access the internal network database, but also access the front-end processor through the external network. Then install and deploy ngxin on this front-end server to implement data proxy.

2. ngxin configuration

        The installation and deployment of ngxin is omitted here, and those who are interested can solve it on Baidu. Here we mainly introduce how to configure the data flow agent. The nginx.conf configuration content is as follows:

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}

stream {    
    upstream oracle {   
        server 192.168.0.1:1521;   #原oracle地址
    }

    upstream mysql {   
        server 192.168.1.102:3306;
    }
    
    server {
        listen  3335;# 反向代理后监听的端口,nginx启动后访问192.168.21.100:3335就可以访问到oracleA
        proxy_connect_timeout 1s;
        proxy_timeout 3s;
        proxy_pass oracle;
    }

    server {
        listen  8888;# 反向代理后监听的端口
        proxy_connect_timeout 1s;
        proxy_timeout 3s;
        proxy_pass mysql;
    }
}

        Restart nginx after modifying the configuration, and then access the front-end processor through the external network IP and port, which is equivalent to directly accessing the internal network database.

3. Test verification

        It can be tested through database client connection tools such as Navicat. The example in the figure below is to access the database at port 3306 through port 8888.

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