Virtual Server

• 1: Overview
• 1.1: Server Type
• 1.2: Monitoring Metrics
• 1.3: ServiceWatch Metrics
• 2: How-to guides
• 2.1: Image
• 2.2: Keypair
• 2.3: Server Group
• 2.4: Change IP
• 2.5: Configure Linux NTP
• 2.6: Configure RHEL Repo and WKMS
• 2.7: Install ServiceWatch Agent
• 3: API Reference
• 4: CLI Reference
• 5: Release Note

1 - Overview

Service Overview

Virtual Server is a cloud computing-optimized virtual server that lets you freely allocate the amount you need at the required time without having to purchase infrastructure resources such as CPU and memory individually. In a cloud environment, you can use resources with optimized performance according to your computing purpose, such as development, testing, and application execution.

Features

• Easy and convenient computing environment setup: Through a web-based Console, users can easily perform self-service provisioning of Virtual Servers, as well as resource and cost management. If you need to change the capacity of major resources such as CPU or Memory while using a Virtual Server, you can easily scale up or down without operator intervention.

• Providing various types of services: Provides virtualized vCore/Memory resources according to predefined server types (1~128 vCore).

  • General Virtual Server: Provides commonly used computing specs (up to 16 vCore, 256 GB)
  • High-capacity Virtual Server: Provided when resources larger than the standard Virtual Server spec are needed.

• Strong Security Implementation: By using the Security Group service, you can control inbound/outbound traffic communicating with the external Internet or other VPCs (Virtual Private Cloud) to securely protect the server. Additionally, real-time monitoring enables stable operation of computing resources.

Service Architecture Diagram

Provided features

Virtual Server provides the following features.

• Auto Provisioning and Management: Provides Virtual Server provisioning, resource management, and cost management functions through a web-based Console. If you need to change the capacity of major resources such as CPU or Memory while using Virtual Server, you can modify the server type immediately using the server type modification feature.
• Standard Server Types and Image Provision: Provides virtualized vCore/Memory resources according to standard server types, and offers standard OS images.
• Storage Connection: Provides additional attached storage beyond the OS disk. Block Storage, File Storage, and Object Storage can be attached and used.
• Network Connection: You can connect the standard subnet/IP settings of the Virtual Server and the Public NAT IP. Provides a local subnet connection for inter-server communication. This can be modified on the detail page.
• Security Group Application: Use the Security Group service to control inbound and outbound traffic communicating with external internet or other VPCs, thereby securely protecting the server.
• Monitoring: You can view monitoring information for computing resources such as CPU, Memory, and Disk through the Cloud Monitoring service.
• Backup and Recovery: You can back up and restore the Virtual Server Image using the Backup service.
• Cost Management: You can create, stop, or terminate servers as needed, and since billing is based on actual usage time, you can monitor costs according to consumption.
• ServiceWatch Service Integration: You can monitor data using the ServiceWatch service.

Component

Virtual Server provides standard server types and standard OS images. Users can select and use them according to the desired service scale.

Image

You can create and manage images. The main features are as follows.

• Image creation: You can create an Image from the configuration of a Virtual Server you are using, and you can also create an Image by uploading your Image file to Object Storage.
• Create Shared Image: You can create an Image with Visibility set to Private as a Shared Image that can be shared.
• Share with another Account: You can share the Image with another Account.
• Refer to the How-to guides > Image document for how to create and use images.

Keypair

To ensure a more secure OS login, we strengthen security by providing a Key Pair instead of the ID/Password entry method. The main features are as follows.

• Keypair creation: Generate a user credential to connect to the Virtual Server.
• Retrieve Public Key: You can load a file or manually enter the public key to retrieve it.
• Refer to the How-to guides > Keypair document for creating and using keypairs.

Server Group

Through Server Group settings, you can position the Block Storage added when creating a Virtual Server close to or distributed across racks and hosts. The main features are as follows.

• Server Group Creation: You can set Virtual Servers belonging to the same Server Group as Anti-Affinity(Distributed placement), Affinity(Proximate placement), or Partition(Virtual Server and Block Storage distributed placement).
• Refer to the How-to guides > Server Group document for how to create and use Server Groups.

OS Image provided version

The OS images provided by Virtual Server are as follows

Server type

The server types supported by Virtual Server are as follows. For detailed information about server types, see Virtual Server Server Types.

Standard s1v2m4

Constraints

Preliminary Service

This is a list of services that need to be pre-configured before creating the service. Please refer to the guide provided for each service and prepare in advance.

1.1 - Server Type

Virtual Server server type

Virtual Server provides server types that match the intended use. Server types consist of various combinations such as CPU, Memory, and Network Bandwidth. The host server used for a Virtual Server is determined by the server type selected when creating the Virtual Server. Please choose a server type based on the specifications of the application you plan to run on the Virtual Server.

The server types supported by Virtual Server are as follows.

Standard s1v2m4

s1 server type

The s1 server type of Virtual Server is offered with standard specifications (vCPU, Memory) and is suitable for various applications.

• First generation of Samsung Cloud Platform v2: Intel 3rd generation (Ice Lake) Xeon Gold 6342 Processor with up to 3.3 GHz
• Supports up to 16 vCPUs and 256 GB of memory
• Maximum networking speed of 12.5 Gbps

s2 server type

The Virtual Server s2 server type is offered with standard specifications (vCPU, Memory) and is suitable for various applications.

• Samsung Cloud Platform v2, 2nd generation: Intel 4th‑generation (Sapphire Rapids) Xeon Gold 6448H Processor up to 3.2 GHz
• Supports up to 16 vCPUs and 256 GB of memory
• Maximum networking speed of 12.5 Gbps

h2 Server Type

The h2 server type of Virtual Server is offered with high-capacity specifications and is suitable for applications that require large-scale data processing.

• Second generation of Samsung Cloud Platform v2: Intel 4th‑generation (Sapphire Rapids) Xeon Gold 6448H processor up to 3.2 GHz
• Supports up to 128 vCPUs and 1,536 GB of memory
• Networking speed up to 25 Gbps

1.2 - Monitoring Metrics

Virtual Server Monitoring Metrics

The table below shows the monitoring metrics of Virtual Server that can be viewed through Cloud Monitoring. For detailed usage of Cloud Monitoring, refer to the Cloud Monitoring guide.

Provides basic monitoring metrics even without installing an agent, as shown below table. Please check the Virtual Server monitoring metrics (default). Additionally, the metrics that can be viewed by installing the Agent are in the table below. Virtual Server additional monitoring metrics (Agent installation required)** Please refer to it.

For Windows OS, memory-related metrics can only be viewed after installing the Agent.

1.3 - ServiceWatch Metrics

Virtual Server sends metrics to ServiceWatch. The metrics provided by default monitoring are data collected at 5‑minute intervals. If detailed monitoring is enabled, you can view data collected at 1‑minute intervals.

See How-to guides > ServiceWatch Enable Detailed Monitoring for instructions on enabling detailed monitoring of Virtual Server.

Basic Metrics

The following are the basic metrics for the Virtual Server namespace.

The indicators whose names are displayed in bold below are the indicators selected as key metrics among the default metrics provided by Virtual Server. The key metrics are used to build service dashboards that are automatically generated for each service in ServiceWatch. They can also be viewed on the Monitoring tab of the Virtual Server detail page.

Each metric provides guidance in the user guide on which statistical value is meaningful to query, and among the meaningful statistics, the values shown in bold text are the primary statistics. In the service dashboard or monitoring tab, you can view primary metrics using these primary statistics.

2 - How-to guides

Users can create the service by entering the required information for a Virtual Server and selecting detailed options through the Samsung Cloud Platform Console.

Create Virtual Server

You can create and use a Virtual Server service in the Samsung Cloud Platform Console.

To create a Virtual Server, follow these steps.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of the Virtual Server.

2. On the Service Home page, click the Create Virtual Server button. 2. Navigate to the Create Virtual Server page.

3. On the Virtual Server Creation page, enter the information required to create the service and select detailed options.

   • Select the required information in the Image and version selection area.

     Category	required status	Detailed description
     Image	Required	Select the provided Image type Standard: Samsung Cloud Platform standard provided Image Alma Linux, Oracle Linux, RHEL, Rocky Linux, Ubuntu, Windows Custom: User-created Image Kubernetes: Image for Kubernetes RHEL, Ubuntu Marketplace: Image subscribed from Marketplace
     Image version	Required	Select version of the selected Image Provide version list of the server Image

     Table. Virtual Server Image and version selection input items
   • In the Service Information Input area, enter or select the required information.

     Category	required status	Detailed description
     Number of servers	Required	Number of servers to create concurrently Only numeric input is allowed, and enter a value between 1~100
     Service Type > Server Type	Required	Virtual Server server type Standard: standard specifications commonly used High Capacity: large‑capacity server specifications beyond Standard For detailed information about the server types provided by Virtual Server, see Virtual Server 서버 타입
     Service Type > Planned Compute	Required	Planned Compute-configured resource status In Use: Number of resources with Planned Compute that are currently in use Configured: Number of resources with Planned Compute configured Coverage Preview: Amount applied per resource by Planned Compute Apply for Planned Compute Service: Go to the Planned Compute service creation page For more details, refer to Planned Compute Apply
     Block Storage	Essential	Block Storage settings used by the server according to purpose Basic OS: Area where the OS is installed and used Capacity is entered in Units, and the minimum size varies by OS Image type Alma Linux: Enter a value between 2~1,536 Oracle Linux: Enter a value between 7~1,536 RHEL: Enter a value between 2~1,536 Rocky Linux: Enter a value between 2~1,536 Ubuntu: Enter a value between 2~1,536 Windows: Enter a value between 4~1,536 SSD: High‑performance general volume HDD: General volume SSD/HDD_KMS: Additional encrypted volume using Samsung Cloud Platform KMS (Key Management Service) encryption keys Encryption can be applied only at initial creation and cannot be changed afterward Using the SSD_KMS disk type may cause performance degradation SSD_Provisioned: SSD volume with configurable IOPS and Throughput Additional: Used when extra user space beyond the OS area is needed After selecting Use, enter the storage type and capacity To add storage, click the + button; to delete, click the x button (up to 25 can be added) Capacity is entered in Units, with a value between 1~1,536 1 Unit equals 8 GB, so 8~12,288 GB are created SSD: High‑performance general volume HDD: General volume SSD/HDD_KMS: Additional encrypted volume using Samsung Cloud Platform KMS (Key Management Service) encryption keys Encryption can be applied only at initial creation and cannot be changed afterward Using the SSD_KMS disk type may cause performance degradation SSD/HDD_MultiAttach: Volume that can be attached to two or more servers SSD_Provisioned: SSD volume with configurable IOPS and Throughput For details on each Block Storage type, see Block Storage 생성하기 Delete on termination: When Delete on Termination is selected, the volume is terminated together with the server A volume with an existing snapshot is not deleted even when Delete on termination is enabled A multi‑attach volume can be deleted only when the server being removed is the last remaining server attached to the volume Max IOPS: Enter a maximum IOPS value between 5,000~20,000 Not configurable for disk types HDD, HDD_KMS, HDD_MultiAttach Max Throughput: Enter a maximum Throughput value between 250~1,000 Not configurable for disk types HDD, HDD_KMS, HDD_MultiAttach
     Server Group	Select	After selecting Use for setting Anti-Affinity (distributed placement), Affinity (proximate placement), Partition (distributed placement of Virtual Server and Block Storage) for servers belonging to the same Server Group , select the Server Group , choose Create New to create the Server Group
     Servers belonging to the same Server Group are placed in a Best Effort manner according to the selected policy
     The policy can be selected among Anti-Affinity (distributed placement), Affinity (proximate placement), Partition (distributed placement of Virtual Server and Block Storage)

     Table. Virtual Server service information input items
     Caution

     When using the Partition (distributed placement of Virtual Server and Block Storage) policy among Server Group policies, you cannot allocate additional Block Storage Volumes after creating a Virtual Server, so create all required Block Storage during the Virtual Server creation step.
   • Required Information Input area, please enter or select the required information.

     Category	required status	Detailed description
     Server name	Essential	Enter a name to distinguish the server when the selected number of servers is 1 Set the hostname to the entered server name Enter using English letters, numbers, spaces, and special characters (-, _) within 63 characters
     Network Settings > Create New Network Port	Required	Set the network where the Virtual Server will be installed VPC Name: Select a pre‑created VPC General Subnet: Select a pre‑created general Subnet IP can be set to auto‑generate or user‑provided; if input is selected, the user can manually enter the IP NAT: Available only when there is a single server and the VPC is attached to an Internet Gateway. Checking Use allows selection of a NAT IP NAT IP: Select a NAT IP If no NAT IP is available, click the Create New button to generate a Public IP Refresh button to view and select the created Public IP Creating a Public IP incurs charges according to the Public IP pricing policy Local Subnet (optional): Select Use for a local Subnet It is not a required element for creating the service A pre‑created local Subnet must be selected IP can be set to auto‑generate or user‑provided; if input is selected, the user can manually enter the IP Security Group: Settings required to access the server Select: Choose a pre‑created Security Group Create New: If no applicable Security Group exists, it can be created separately in the Security Group service Up to 5 can be selected If no Security Group is set, all connections are blocked by default A Security Group must be configured to allow required connections
     Network Settings > Specify Existing Network Port	Required	Set the network where the Virtual Server will be installed VPC: Select a pre‑created VPC General Subnet: Select a pre‑created general Subnet and port NAT: Available only when there is a single server and the VPC is attached to an Internet Gateway. When enabled, you can select a NAT IP NAT IP: Select a NAT IP If no NAT IP is available to select, click the Create New button to generate a Public IP Refresh button to view and select the created Public IP Local Subnet (Optional): Choose Use for the local Subnet Select a pre‑created local Subnet and port
     Keypair	Required	User authentication method to use when connecting to the server Create new: Create a new one if a new keypair is required Refer to Keypair 생성하기 Default login account list by OS Alma Linux: almalinux Oracle Linux: cloud-user RHEL: cloud-user Rocky Linux: rocky Ubuntu: ubuntu Windows: sysadmin

     Table: Required input fields for Virtual Server
   • Additional Information Input area, please enter or select the required information.

     Category	required status	Detailed description
     Lock	Select	Lock usage setting Using the lock prevents actions such as server termination, start, stop, etc., from being executed, preventing misoperations due to mistakes
     Init script	Select	the script that runs when the server starts The init script must be written as a Batch script for Windows, a Shell script or cloud‑init for Linux, depending on the Image type. Up to 45,000 bytes can be entered
     tag	Select	Add Tag Up to 50 can be added per resource After clicking the Add Tag button, enter or select Key, Value values

     Table. Virtual Server additional information input fields

4. Summary Check the detailed information and estimated charges generated in the panel, and click the Create button.

   • Once creation is complete, check the created resources on the Virtual Server List page.

Check Virtual Server detailed information

The Virtual Server service allows you to view and edit the entire resource list and detailed information. The Virtual Server Details page includes the Details, Monitoring, Tags, Activity Log tabs.

To view detailed information about the Virtual Server service, follow these steps.

1. All Services > Compute > Virtual Server menu, click it. 1. Navigate to the Service Home page of the Virtual Server.
2. On the Service Home page, click the Virtual Server menu. 2. Go to the Virtual Server List page.
3. On the Virtual Server List page, click the resource to view detailed information. 3. Navigate to the Virtual Server Details page.
   • Virtual Server Details page displays status information and additional feature information, and consists of Details, Monitoring, Tags, Activity Log tabs.
   • For detailed information about Virtual Server Add-on Features, please refer to Virtual Server Management Add-on Features.

     Category	Detailed description
     Virtual Server status	Status of a user-created Virtual Server Build: State where a Build command has been received Building: Build in progress Networking: Server creation networking process Scheduling: Server creation scheduling process Block_Device_Mapping: Attaching Block Storage during server creation Spawning: Server creation process is ongoing Active: Available state Powering_off: State when a shutdown request is made Deleting: Server deletion in progress Reboot_Started: Reboot in progress Error: Error state Migrating: Server is being migrated to another host Reboot: Reboot command has been received Rebooting: Restart in progress Rebuild: Rebuild command has been received Rebuilding: State when a Rebuild request is made Rebuild_Spawning: Rebuild process is ongoing Resize: Resize command has been received Resizing: Resize in progress Resize_Prep: State when a server type change is requested Resize_Migrating: Server is being moved to another host while resizing Resize_Migrated: Server has completed moving to another host during resize Resize_Finish: Resize completed Revert_Resize: Resize or migration of the server failed for some reason. The target server is cleaned up and the original server is restarted Shutoff: State when powering off is completed Verity_ Resize: After a server type change request and Resize_Prep, the server type is confirmed or can be reverted Resize_Reverting: State when a server type revert is requested Resize_Confirming: State while confirming the server’s Resize request
     Server control	Buttons to change server status Start: Start a stopped server Stop: Stop a running server Restart: Restart a running server
     Image generation	Create a user Image from the current server’s Image For detailed Image creation instructions, see Create Image
     Console log	View console logs of the current server You can check the console logs output by the current server. For more details, see 콘솔 로그 확인하기
     Create dump	Create a dump of the current server Dump file is created inside the Virtual Server Refer to Dump 생성하기 for detailed dump creation instructions
     Rebuild	The OS area data and settings of the existing Virtual Server are deleted, and it is rebuilt on a new server For details, see Rebuild 수행하기
     Service termination	Button to cancel the service

     Table. Virtual Server status information and additional functions

Detailed Information

Virtual Server List page lets you view detailed information of the selected resource and, if needed, modify the information.

Monitoring

You can monitor the ServiceWatch metrics of the resources selected on the Virtual Server List page. In the Monitoring tab, you can view monitoring charts for the Virtual Server, and each chart is based on the available Service Watch metrics.

Tag

Virtual Server List page lets you view the tag information of the selected resource, and you can add, modify, or delete it.

Job History

Virtual Server List page allows you to view the operation history of the selected resource.

Control Virtual Server Operation

If you need to control the operation of a created Virtual Server resource, you can perform the task from the Virtual Server List or Virtual Server Details page. You can start, stop, and restart a running server.

Getting Started with Virtual Server

You can start a Virtual Server that is Shutoff. To start the Virtual Server, follow these steps.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of the Virtual Server.
2. On the Service Home page, click the Virtual Server menu. 2. Go to the Virtual Server List page.
3. Virtual Server List page, click the resource to start among the shutoff servers, and navigate to the Virtual Server Details page.
   • On the Virtual Server List page, you can Start each resource via the right More button.
   • After selecting multiple servers with checkboxes, you can control multiple servers simultaneously using the Start button at the top.
4. Virtual Server Details page, click the Start button at the top to start the server. 4. Check the status of the modified server in the Status Indicator item.
   • When the Virtual Server start is complete, the server status changes from Shutoff to Active.
   • For detailed information about the Virtual Server status, please refer to Virtual Server Detailed Information.

Stop Virtual Server

You can stop a Virtual Server that is running (Active). To stop the Virtual Server, follow the steps below.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of the Virtual Server.
2. On the Service Home page, click the Virtual Server menu. 2. Go to the Virtual Server List page.
3. On the Virtual Server List page, click the resource to stop among the active servers, and proceed to the Virtual Server Details page.
   • On the Virtual Server List page, you can stop each resource via the right More button.
   • After selecting multiple servers with checkboxes, you can control multiple servers simultaneously using the Stop button at the top.
4. On the Virtual Server Details page, click the Stop button at the top to start the server. 4. Check the status of the modified server in the Status Indicator item.
   • When the Virtual Server shutdown is complete, the server status changes from Active to Shutoff.
   • For detailed information about the Virtual Server status, please refer to Virtual Server Detailed Information.

Restart Virtual Server

You can restart the created Virtual Server. To restart the Virtual Server, follow these steps.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of the Virtual Server.
2. On the Service Home page, click the Virtual Server menu. 2. Go to the Virtual Server List page.
3. On the Virtual Server List page, click the resource to restart, and go to the Virtual Server Details page.
   • On the Virtual Server list page, you can restart each resource via the right More button.
   • After selecting multiple servers with checkboxes, you can control multiple servers simultaneously using the Restart button at the top.
4. On the Virtual Server Details page, click the Restart button at the top to start the server. 4. Check the status of the changed server in the Status Display section.
   • During a Virtual Server restart, the server status goes through Rebooting and finally changes to Active.
   • For detailed information about the Virtual Server status, please refer to Virtual Server Detailed Information.

Managing Virtual Server Resources

If you need server control and management functions for the created Virtual Server resources, you can perform tasks on the Virtual Server List or Virtual Server Details page.

Create Image

You can create an image of a running Virtual Server.

To create an Image of a Virtual Server, follow these steps.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of Virtual Server.

2. On the Service Home page, click the Virtual Server menu. 2. Navigate to the Virtual Server List page.

3. On the Virtual Server List page, click the resource to create an Image. 3. Navigate to the Virtual Server Details page.

4. On the Virtual Server Details page, click the Create Image button. 4. Go to the Image creation page.

   • Enter the required information in the Service Information Input area.

     Category	required status	Detailed description
     Image name	Required	the name of the Image to be created English letters, numbers, spaces, and special characters (-, _) within 200 characters

     Table. Image service information input fields

5. Check the input information and click the Complete button.

   • When creation is complete, check the created resources on the All Services > Compute > Virtual Server > Image List page.

Edit Server Type

You can modify the server type of a Virtual Server.

To modify the server type of a Virtual Server, follow these steps.

1. Click the All Services > Compute > Virtual Server menu. 1. Navigate to the Service Home page of the Virtual Server.
2. On the Service Home page, click the Virtual Server menu. 2. Go to the Virtual Server List page.
3. On the Virtual Server List page, click the resource you want to control. 3. Go to the Virtual Server Details page.
4. On the Virtual Server Details page, check the server status and click the Edit button for the server type. 4. Edit Server Type popup window opens.
5. Edit Server Type In the popup window, after changing the server type, click the Confirm button.
   • If you modify the Virtual Server’s server type, the Virtual Server status changes to a state related to performing a resize.
   • For detailed information about the Virtual Server status, please refer to Virtual Server Detailed Information.