Overview

ECS Overview

An Elastic Cloud Server (ECS) is a basic computing unit that consists of vCPUs, memory, OS, and Elastic Volume Service (EVS) disks.

After creating an ECS, you can use it like using your local computer or physical server, ensuring a secure, reliable, and efficient computing environment. ECSs support self-service creation, modification, and operation. You can create an ECS by specifying its vCPUs, memory, OS, and login authentication. After the ECS is created, you can modify its specifications as required.

There are a wide range of ECS types available to meet your compute and storage requirements. Each ECS type offers various flavors with different vCPU and memory configurations for you to choose from.

For details about ECS types, see ECS Types.
For details about ECS specifications, see A Summary List of x86 ECS Specifications and A Summary List of Kunpeng ECS Specifications.

Instance Configuration

You can configure parameters such as vCPUs, memory, OS, storage, and network for an ECS.

**Table 1** Instance configurations
Item	Description	Reference
Specifications	ECS provides a range of x86 or Kunpeng ECS specifications. ECS specifications define the number of vCPUs, memory size, assured/maximum intranet bandwidth, maximum packets per second (PPS), IPv6 support, and other configurations.	A Summary List of x86 ECS Specifications A Summary List of Kunpeng ECS Specifications
Image	An image contains the OS, application software, and initialized applications required by an ECS. You can choose from public, private, shared, and KooGallery images.	Overview
Storage	ECSs store data through the attached cloud disks and local disks. Cloud disks: are created from the dedicated distributed storage pool or EVS disks and can be used as system disks or data disks. Local disks: only can be used as data disks. ECSs of certain specifications have local disks by default.	Overview
Network	Virtual Private Cloud (VPC) allows you to create logically isolated, configurable, and manageable virtual networks for ECSs. You can configure NICs, private IP addresses, and security groups in your VPC. By default, ECSs in different VPCs cannot communicate with each other.	Overview

Instance Selection

**Table 2** Instance selection
Method	Description	Reference
By Type	ECS specifications are filtered by CPU architecture, number of vCPUs, memory size, flavor name, and instance family. You can select this mode if you want to select specific specifications of ECSs.	Purchasing an ECS in Custom Config Mode
By Scenario	ECS specifications are filtered based on categories such as web applications, website applications/e-commerce, games, and databases as well as service volumes. You can select this mode if you have specific service requirements and want to select specifications based on service scenarios and volumes.	Purchasing an ECS in Custom Config Mode