huaweicloud Huawei Cloud DDS / DCS
STOP - Do not answer from general knowledge. Follow the procedure below.
Always run hcloud DDS <Operation> --help or hcloud DCS <Operation> --help before constructing commands.
DDS (Document Database Service — MongoDB Compatible)
DDS Critical Warnings
| Trap | Why |
|---|---|
| Requires 3-node replica | Minimum production deployment needs 3 nodes |
| Shard key permanent | Once selected, shard key cannot be changed |
| Storage auto-scaling off | Enable before storage fills |
Common Workflows
| Task | Operation |
|---|---|
| List instances | ListInstances --cli-region=<r> --project_id=<p> |
| Create instance | CreateInstance --cli-region=<r> --project_id=<p> |
| Delete instance | DeleteInstance --cli-region=<r> --project_id=<p> |
| Add readonly node | AddReadonlyNode --cli-region=<r> --project_id=<p> |
| Add shard | AddShardingNode --cli-region=<r> --project_id=<p> |
| Create backup | CreateBackup --cli-region=<r> --project_id=<p> |
Discover exact parameters with --help before executing any command.
DCS (Distributed Cache Service — Redis/Memcached)
DCS Critical Warnings
| Trap | Why |
|---|---|
| Redis password required | Cannot create Redis instance without password |
| Memcached no password | Memcached has no auth — only accessible within VPC |
| Cache persistence costs | AOF/RDB persistence uses additional storage |
Common Workflows
| Task | Operation |
|---|---|
| List instances | ListInstances --cli-region=<r> --project_id=<p> |
| Create Redis instance | CreateInstance --cli-region=<r> --project_id=<p> |
| Delete instance | DeleteInstances --cli-region=<r> --project_id=<p> |
| Restart instance | RestartInstance --cli-region=<r> --project_id=<p> |
| Show node information | BatchShowNodesInformation --cli-region=<r> --project_id=<p> |
| Create custom template | CreateCustomTemplate --cli-region=<r> --project_id=<p> |
Discover exact parameters with --help before executing any command.
Troubleshooting
| Error | Fix |
|---|---|
| DDS instance creation fails | Check 3-node minimum, VPC/subnet availability |
| DCS connection refused | Redis instances need password. Memcached only accessible within VPC |
| DCS auto-expire not working | Enable auto-expire scan task for Redis |
Cross-Skill References
- VPC/Subnet: See
huawei-vpcfor instance networking - Backup/CBR: See
huawei-cbrfor backup management