Shulou(Shulou.com)06/01 Report--

The RDS for getting started with database is matched with each component.

Today, I would like to introduce how Huawei cloud database is used in conjunction with various services.

First, let's take a look at the overall architecture of RDS:

After users log in to Huawei's cloud official website, they send out various actions through RDS Console. Take the creation of an instance as an example. After receiving the request, the core components of RDS apply for various resources, including ECS, EVS, VPC, and so on. After the instance is created, the database is accessed by providing an IP address.

From the above, we can see that the services matched with the database mainly include:

Computing resources-ECS (Elastic Cloud Server), elastic CVM

Storage resources-EVS (Elastic Volume Service) cloud disk, OBS (Object-Based Storage), object storage service

Network Resources-VPC (Virtual Private Cloud) Virtual Private Cloud

Management and deployment-CES (Cloud Eye Service) Cloud Monitoring Service, IAM (Identity and Access Management), Unified identity Authentication Service

Database ecology-DCS (Distributed Cache Service) distributed cache service, DDM (Distributed Database Middleware) distributed database middleware.

Next, let's take a look at the specific role and value of each service.

ECS, also known as VM, from the bottom of the principle, the instance of RDS is running various database processes on ECS. RDS MySQL, for example, runs various MySQL processes on ECS. Currently, a RDS instance corresponds to a VM, so ECS is the most important. At the same time, if you are accessing RDS through VPC, you generally need to apply for ECS to install some database clients.

VPC, also known as virtual private cloud, is a network-related term, the main purpose is to create isolated local area networks. After users sign up for an account on Huawei Cloud, they generally have to create a VPC first, otherwise many services cannot be created, or some services will create a default VPCVPC. The most important thing is the concept of subnet security group, which is used for network access, which is a very important concept in public cloud. Compared with the traditional whitelist, it is powerful and easy to use.

EVS (Elastic Volume Service), RDS uses the technology of separation of computing and storage, and storage uses three copies of EVS, which is what we often call cloud disk. Compared with using local disk, it has 99.99999% data persistence, the highest single disk can support 32T storage capacity, and flexible expansion is easy and fast.

OBS object storage service generally stores relatively cold data. As permanent storage, it is cheap and has a simple access protocol. RDS will store full data backup and incremental logs on OBS.

Cloud monitoring service is mainly used for monitoring and alarm. RDS installs Agent on a VM to collect monitoring items and display them on cloud monitoring services. In addition to monitoring, an alarm can also be set. When some monitoring items exceed the threshold, they can send text messages to users, through which users can learn about the operation of the database in real time.

DDM distributed database middleware, when the storage capacity performance of a single instance can not meet the requirements, the common practice in the industry is to manage it by database and table. At this time, it is necessary to use distributed database middleware at the front end to manage these sub-libraries and tables and be transparent to the application.

IAM unified identity authentication service, which is the basic service of the public cloud, is the permission to manage the account of the public cloud account. Token management is provided by this service. However, it is necessary to strictly distinguish the difference between IAM accounts and database accounts. The IAM account is mainly used to manage resources, while the database account is mainly used to manage database data.

We have learned the ability to use RDS with various services above. Do you want to do some hands-on experiments and practical operations? Huawei Cloud College has launched database entry-level and advanced courses, video courses with graphic tutorials, "hand-in-hand" to take you to learn database knowledge. Enter the https://edu.huaweicloud.com/courses/ experience of Huawei Cloud College today and learn more database skills!

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