Huawei Cloud DCS Count Skill

Overview

This skill counts Huawei Cloud DCS (Distributed Cache Service) instances — the managed Redis / Memcached service — in a region and outputs the number. It supports four counting modes:

• Total count — number of all DCS instances in a region.
• Redis / Memcached count — number of instances for a specific engine, derived from the per-engine breakdown of ListNumberOfInstancesInDifferentStatus.
• Filtered count — number of instances matching a status (e.g. RUNNING).
• Per-status breakdown — counts of instances grouped by lifecycle status (running, creating, frozen, error, etc.) via ListNumberOfInstancesInDifferentStatus.

The total count is taken from the authoritative instance_num field returned by the list API, so the result is exact regardless of page size — no pagination sum is needed for the count itself.

Architecture:

Agent → hcloud CLI (primary) → Huawei Cloud DCS API
       ↘ Python SDK (fallback) ↗

Applicable Scenarios:

• Daily inspection: how many Redis/DCS instances exist in a region
• Cache instance inventory and cost review
• Redis-only inventory when the project also uses Memcached
• Capacity planning and pre-migration verification
• Quick health check of how many instances are running vs. non-running

Prerequisites

1. hcloud CLI installed and authenticated — See references/cli-installation-guide.md
2. Python 3.8+ with the huaweicloudsdkdcs package (SDK fallback)
3. Huawei Cloud AK/SK configured via environment variables or the hcloud CLI profile
4. IAM permissions — read-only access to DCS instances — See references/iam-policies.md

Workflow

1. Identify query scope — Decide which region to query and which counting mode to use (total, engine-specific, status-filtered, or per-status breakdown)
2. Select execution mode — Use the hcloud CLI by default; fall back to the Python SDK if the CLI is unavailable
3. Execute the query — Run the count commands and capture instance_num from each response
4. Present results — Output the DCS instance count to the user

Core Commands

Count All DCS Instances

Count-Only Lookup (jq)

To return just the numeric count:

hcloud DCS ListInstances --cli-region={region} --limit={limit} | jq -r '.instance_num'

Count Redis-Only Instances

The ListNumberOfInstancesInDifferentStatus API returns per-engine status statistics. Sum the redis.* status counters for the total Redis count:

hcloud DCS ListNumberOfInstancesInDifferentStatus --cli-region={region} | jq '[.redis | to_entries[].value | tonumber] | add'

For just the number of running Redis instances:

hcloud DCS ListNumberOfInstancesInDifferentStatus --cli-region={region} | jq -r '.redis.running_count'

Filtered Count by Status

To return just the numeric count for a status:

hcloud DCS ListInstances --cli-region={region} --status=RUNNING --limit={limit} | jq -r '.instance_num'

Valid {status} values include: RUNNING, CREATING, FROZEN, ERROR, RESTARTING, EXTENDING, CLOSING, CLOSED, FLUSHING, UPGRADING, RESTORING, MIGRATING.

Per-Status Count Breakdown

To extract the number of running Redis instances:

hcloud DCS ListNumberOfInstancesInDifferentStatus --cli-region={region} | jq -r '.redis.running_count'

SDK Fallback Examples

When the CLI is unavailable, use the Python SDK:

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdcs.v2.region.dcs_region import DcsRegion
from huaweicloudsdkdcs.v2 import DcsClient, ListInstancesRequest

credentials = BasicCredentials().with_ak(os.getenv("HUAWEI_ACCESS_KEY")) \
                                .with_sk(os.getenv("HUAWEI_SECRET_KEY"))

client = DcsClient.new_builder() \
    .with_credentials(credentials) \
    .with_region(DcsRegion.value_of("{region}")) \
    .build()

response = client.list_instances(ListInstancesRequest(limit={limit}))
print(response.instance_num)

Per-engine count via SDK:

from huaweicloudsdkdcs.v2 import ListNumberOfInstancesInDifferentStatusRequest

resp = client.list_number_of_instances_in_different_status(
    ListNumberOfInstancesInDifferentStatusRequest())
redis_total = sum(int(v) for k, v in resp.redis.to_dict().items() if isinstance(v, int))
print(resp.redis.running_count)

A ready-to-run helper script is provided in scripts/count_dcs_instances.py.

Parameter Confirmation

Reference Documents

• CLI Installation Guide
• IAM Policies
• Verification Method
• Data Flow Diagram
• Acceptance Criteria

KooCLI Command Format Standard

hcloud <Service> <Operation> --cli-region=<region> [--key=value ...]