Huawei Cloud Computing Products and Solutions
Domain scope
This domain tests Huawei Cloud product selection: compute, storage, network, database, and management services, and how they fit together in a solution.
Core rules
- ECS is a virtual server; BMS is bare metal; IMS stores private images; AS adds and removes ECS instances from a scaling group.
- EVS is block storage attached to one ECS in one AZ; OBS is object storage accessed by HTTP/API and bucket policies; SFS is shared file storage for multiple clients.
- VPC provides subnets, route tables, and security groups; ELB distributes Layer 4/7 traffic; EIP gives public access.
- RDS is a managed relational database; DCS is managed Redis/Memcached; DDS is a managed document database; GaussDB and DWS cover distributed OLTP and analytics.
- CCE is managed Kubernetes; FunctionGraph is serverless functions; ModelArts is AI development.
Worked example
Design a small e-commerce site. Put an ELB in front of ECS instances in an AS group, store images in OBS, keep session state in DCS Redis, and use RDS MySQL for orders. Reason: ELB distributes traffic, AS handles load spikes, OBS gives durable cheap object storage for media, DCS removes session affinity from individual ECS, and RDS offloads backup and HA. Do not put the database on the same ECS if the exam asks for a managed, highly available design.
Traps
OBS cannot be formatted and mounted as a block disk. EVS is AZ-scoped; an ECS cannot attach an EVS volume from another AZ. ELB does not create or resize ECS instances; AS does. RDS is not a self-managed MySQL on ECS; it trades OS control for managed operations.