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What Is ECS?

Updated at:Sep 03, 2020 GMT+08:00

An Elastic Cloud Server (ECS) is a basic computing unit that consists of vCPUs, memory, OS, and Elastic Volume Service (EVS) disks. After the ECS is created, you can use it on the cloud like using your local PC or physical server.

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. This ensures a reliable, secure, efficient computing environment.

Why ECS?

  • Rich specifications: A variety of ECS types are available for different scenario requirements. There are multiple customizable specifications for each type.
  • Comprehensive images: Public, private, and shared images can be flexibly selected to request for ECSs.
  • Differentiated EVS disks: Common I/O, high I/O, ultra-high I/O, and general purpose SSD disks are available for all of your service requirements.
  • Flexible billing modes: Yearly/Monthly and pay-per-use billing modes allow you to purchase and release resources at any time based on service fluctuation.
  • Reliable data: Scalable, reliable high-throughput virtual block storage is based on distributed architecture.
  • Security protection: The network is isolated and protected using security group rules from viruses and Trojan horses. Security services, such as Anti-DDoS, Web Application Firewall (WAF), and Vulnerability Scan Service (VSS) are included to further enhance ECS security.
  • Flexible, easy-to-use: Elastic computing resources are automatically adjusted based on service requirements and policies to efficiently meet service requirements.
  • Highly efficient O&M: Multi-choice management via the management console, remote access, and APIs with full rights.
  • In-cloud monitoring: Cloud Eye samples monitored metrics in real time, correctly generates resource monitoring alarms, and sends notifications to related personnel immediately after the alarms are triggered.
  • Load balancing: Elastic Load Balance (ELB) automatically distributes access traffic to multiple ECSs to balance their service load. It enables higher levels of fault tolerance in your applications and expands application service capabilities.

For more details, see ECS Advantages and ECS Application Scenarios.

System Architecture

ECS works with other products and services to provide computing, storage, network, and image installation functions.

  • ECSs are deployed in multiple availability zones (AZs) connected with each other through an internal network. If an AZ becomes faulty, other AZs in the same region will not be affected.
  • With the Virtual Private Cloud (VPC) service, you can build a dedicated network, set the subnet and security group, and allow the VPC to communicate with the external network through an EIP (bandwidth support required).
  • With the Image Management Service (IMS), you can install images on ECSs, or create ECSs using private images for rapid service deployment.
  • The Elastic Volume Service (EVS) provides storage and Volume Backup Service (VBS) provides data backup and recovery functions.
  • Cloud Eye is a key measure to ensure ECS performance, reliability, and availability. Using Cloud Eye, you can determine ECS resource usage.
  • Cloud Backup and Recovery (CBR) backs up data for EVS disks and ECSs, and uses snapshot backups to restore the EVS disks and ECSs.
Figure 1 System architecture

Access Methods

The public cloud provides a web-based service management platform. You can access ECSs through HTTPS-compliant application programming interfaces (APIs) or the management console. These two access methods differ as follows:
  • Accessing ECSs through APIs

    Use this method if you are required to integrate the ECSs on the public cloud platform into a third-party system for secondary development. For detailed operations, see Elastic Cloud Server API Reference.

  • Accessing ECSs through the management console

    Use this method if you are not required to integrate ECSs with a third-party system.

    After registering on the public cloud platform, log in to the management console and click Elastic Cloud Server under Computing on the homepage.

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