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What Is ECS?

Updated at: Jan 06, 2022 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 an ECS is created, you can use it on the cloud similarly to how you would use 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 mode. After an ECS is created, you can modify its specifications if necessary. ECS works with other services to provide 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, and network resources. You can quickly migrate and replicate existing ECSs using images.

  • ECSs can be deployed in multiple availability zones (AZs) connected with each other through an internal network. If one AZ becomes faulty, other AZs in the same region will not be affected.
  • With the Virtual Private Cloud (VPC) service, you can build your own dedicated network on the cloud. You can also set subnets and security groups within your VPC for further isolation. You can allow your VPC to communicate with the external network through an EIP (bandwidth support required).
  • With the Image Management Service (IMS), you can use an image to create ECSs. Alternatively, you can use an existing ECS to create a private image and use the private image to create the same ECSs for rapid service deployment.
  • Elastic Volume Service (EVS) provides storage space and Volume Backup Service (VBS) provides data backup and restoration functions.
  • Cloud Eye lets you keep a close eye on the performance and resource utilization of ECSs, ensuring ECS reliability and availability.
  • Cloud Backup and Recovery (CBR) backs up data for EVS disks and ECSs, and uses snapshots and 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.
  • 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 Compute on the homepage.

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