EPAS(DBaaS) Server Connection

Scenario Overview

EPAS(DBaaS) Server Connection scenario involves creating a Bastion host (Virtual Server) and a Database service, and accessing the DB service through the Bastion host. To reliably connect to EPAS (DBaaS) in the Samsung Cloud Platform environment, you need to create a Bastion host and establish a network connection using it. To maintain stability and a high level of security, it is recommended to configure the Database service in a Private Subnet environment and set up the Bastion host in a restricted Public Subnet environment.

This scenario primarily describes creating a Bastion host and a Database service, configuring the network environment for Bastion host and Database access, and connecting through a DB client.

Scenario components

You can build the scenario using the following services.

Scenario setup method

Create the services needed to build the scenario by following the steps below.

Configure the network

Describes the process of configuring the network environment for accessing the Bastion Host and Database services.

1-1. Create VPC

1. Click the All Services > Networking > VPC menu. You will be taken to the VPC’s Service Home page.
2. Click the Create VPC button on the Service Home page. You will be taken to the Create VPC page.
3. On the VPC Creation page, enter the information required to create the service.
   • Enter the IP range as 192.168.x.0/16
4. Summary Check the detailed information and estimated billing amount generated in the panel, and click the Complete button.
   • Once creation is complete, check the created resources on the VPC List page.

1-2. Create Subnet

1. Click the All Services > Networking > VPC menu. Navigate to the VPC Service Home page.
2. On the Service Home page, click the Subnet menu. You will be taken to the Subnet List page.
3. Click the Subnet Create button. You will be taken to the Subnet Create page.
4. On the Subnet Creation page, enter the information required to create the service.
   • Select the Subnet type as General.
   • Select a pre‑created VPC.
   • Enter the IP range as 192.168.x.0/24.
5. In the Summary panel, verify the detailed information and estimated billing amount, then click the Complete button.
   • When creation is complete, check the created resources on the Subnet list page.

1-3. Create Internet Gateway

1. Click the All Services > Networking > VPC menu. You will be taken to the VPC’s Service Home page.
2. On the Service Home page, click the Internet Gateway menu. You will be taken to the Internet Gateway List page.
3. Click the Create Internet Gateway button. You will be taken to the Create Internet Gateway page.
4. On the Internet Gateway Creation page, enter the required information needed to create the service.
   • Select a pre‑created VPC.
   • In the Firewall usage item, select Use.
5. Summary Check the detailed information and estimated billing amount generated in the panel, and click the Complete button.
   • Once creation is complete, verify the created resource on the Internet Gateway list page.

1-4. Create Public IP

1. Click the All Services > Networking > VPC menu. Navigate to the VPC Service Home page.
2. On the Service Home page, click the Public IP menu. You will be taken to the Public IP List page.
3. Click the Public IP Reservation button. You will be taken to the Public IP Reservation page.
4. On the Public IP reservation page, enter the required information needed to reserve the service.
5. In the Summary panel, verify the detailed information and estimated billing amount, then click the Complete button.
   • Once creation is complete, check the created resources on the Public IP List page.

1-5. Create Security Group

1. Click the All Services > Networking > Security Group menu. Go to the Service Home page of Security Group.
2. Click the Create Security Group button on the Service Home page. Navigate to the Create Security Group page.
3. On the Security Group creation page, enter the required information needed to create the service.
4. Check the input information and click the Complete button.
   • Once creation is complete, check the created resources on the Security Group List page.

Create bastion host

Describes the process of configuring a Bastion Host that requires the Database access client to be installed.

2-1. Create Server Keypair

1. Click the All Services > Compute > Virtual Server menu. Navigate to the Service Home page of Virtual Server.
2. On the Service Home page, click the Keypair menu. You will be taken to the Keypair List page.
3. Click the Keypair creation button. You will be taken to the Keypair creation page.
4. Enter the required information needed to create a service on the Keypair creation page.
5. Check the creation information and click the Complete button.
   • The key can be downloaded only once, and reissuance is not available.
   • Please store the downloaded key in a secure location.

2-2. Create Bastion host

1. Click the All Services > Compute > Virtual Server menu. Navigate to the Service Home page of Virtual Server.
2. On the Service Home page, click the Virtual Server Create button. It navigates to the Virtual Server Create page.
3. Virtual Server Creation page, enter the required information to create the service.
   • Select Windows for the image.
   • Select the pre-created VPC and Subnet.
   • Click Use NAT, then in 1-4. Create Public IP select the reserved Public IP.
   • Connect the Keypair you created in 2-1. Create Server Keypair.
4. Summary Check the detailed information and estimated billing amount generated in the panel, and click the Complete button.
   • After creation is complete, verify the created resources on the Virtual Server list page.

2-3. Bastion host Check login ID and PW

1. Click the All Services > Compute > Virtual Server menu. Navigate to the Service Home page of Virtual Server.
2. Click the Virtual Server menu on the Service Home page. You will be taken to the Virtual Server List page.
3. On the Virtual Serve List page, click the resource you created in 2-2. Create Bastion host. You will be taken to the detailed information page of that resource.
4. On the detail information page, click the RDP password View button in the Keypair name field. The RDP password View popup window will open.
5. In the RDP password lookup popup window, attach the keypair file downloaded from 2-1. 서버 Keypair 생성하기.
6. After attaching, click the Password Check button. The ID and Password for accessing the resource are displayed.
   • The ID and Password are used later as credentials to access the Bastion host in 5-1. Bastion host 접속하기.

Create Database

Describes the process of creating a Database service.

3-1. EPAS(DBaaS) Service Creation

1. Click the All Services > Database > EPAS(DBaaS) menu. Go to the Service Home page of EPAS(DBaaS).
2. Click the EPAS(DBaaS) Create button on the Service Home page. You will be taken to the EPAS(DBaaS) Create page.
3. Create EPAS (DBaaS) Enter the required information needed to create the service on this page.
   • Select the pre‑created VPC and Subnet and connect them.
   • Enter the database-related creation details on the required information input screen.
   • Add the Bastion host IP in the IP access control settings.
   • The Database Port defaults to 2866, but the user can also specify it.
4. Summary Check the detailed information and estimated billing amount generated in the panel, and click the Complete button.
   • When creation is complete, verify the created resource on the EPAS(DBaaS) list page.

Configuring Rules

It explains the process of configuring rules for a user to connect to the Bastion host and rules for connecting to the Database from the Bastion host.

4-1. Add Security Group Rules

1. Click the All Services > Networking > Security Group menu. Navigate to the Service Home page of the Security Group.
2. From the Service Home page, click the Security Group menu. You will be taken to the Security Group List page.
3. Select the Security Group resource created in 1-5. Create Security Group. Navigate to the detailed information page of that resource.
4. On the detail information page, click the Rules tab. You will be taken to the Rules tab.
5. On the Rules tab, click the Add Rule button. You will be taken to the Add Rule popup.
6. Add Rule In the popup window, enter the rule below, and click the Confirm button.

   direction	Remote	target address	Protocol	port	Explanation
   Inbound	CIDR	User PC IP	TCP	3389 (RDP)	Bastion client PC → Bastion host
   Outbound	CIDR	DB IP	TCP	Database Port (manual entry)	Bastion host → Database

   Table. Security Group rules that need to be added

4-2. Add IGW Firewall Rule

1. All Services > Networking > Firewall Click the menu. Go to the Service Home page of the Firewall.
2. On the Service Home page, click the Firewall menu. You will be taken to the Firewall List page.
3. On the Firewall List page, select the Internet Gateway Resource Name created in 1-3. Internet Gateway 생성하기. You will be taken to the detailed information page for that resource.
4. Click the Rules tab on the detail information page. You will be taken to the Rules tab.
5. On the Rules tab, click the Add Rule button. You will be taken to the Add Rule popup.
6. Add Rule In the popup window, enter the rule below, and click the Confirm button.

   origin address	Destination address	Protocol	Port	Operation	direction	Explanation
   Bastion connection PC IP	Bastion host IP	TCP	3389(RDP)	Allow	Inbound	User PC → Bastion host

   Table. Internet Gateway Firewall rules that need to be added

Connect to Database

Describes the process of a user accessing the database via a DB client program.

This guide explains how to connect using pgAdmin. Since there are various database client programs and CLI utilities, you may install and use the tool that best fits your needs.

5-1. Connecting to Bastion host

1. In the Windows environment of the PC that will connect to the Bastion host, run Remote Desktop Connection, then enter the NAT IP of the Bastion Host and click the Connect button.
2. When the remote desktop connection succeeds, the user credential input window opens. Enter the ID and Password verified in 2-3. Bastion host Access ID and PW Check and click the Confirm button.

5-2. Install DB client program (pgAdmin) on the Bastion host

1. Go to the official pgAdmin page and download the pgAdmin program.
   • pgAdmin program download URL: https://www.pgadmin.org/download/
2. Connect the user’s PC hard drive to upload the file to the Bastion host.
3. In the Remote Desktop Connection Local Resources tab, click the Details button for the Local Devices and Resources entry.
4. Select the local disk of the location where the file was downloaded on the drive, and click the OK button.
5. Copy the downloaded file, upload it to the Bastion Host, and click the pgAdmin installer to install.

5-3. Connect to the database using the DB client program (pgAdmin)

1. Run pgAdmin and click the Add New Server button.
2. Register - Server popup window, enter the Database server information created in 3-1. EPAS(DBaaS) Create Service into the General and Connection tabs, and click the Save button.

   Screen (tab)	Required input field	input value
   General	Name	Custom (ex. service name)
   Connection	Host name/address	Database server IP
   Connection	Port	Database Port
   Connection	Maintenance database	Database name
   Connection	Password	Database password

   Table: DB connection client program input fields
3. Click the name of the database created in pgAdmin to connect.
   • After connecting, you can perform simple queries, among other tasks.