Alibaba Cloud Storage OSS Ossutil

OSS object storage workflows

Category: tool

OSS (ossutil 2.0) CLI Skill

Validation

bash

python skills/storage/oss/alicloud-storage-oss-ossutil/scripts/check_ossutil.py --output output/alicloud-storage-oss-ossutil/validate.txt

Pass criteria: command exits 0 and output/alicloud-storage-oss-ossutil/validate.txt is generated.

Output And Evidence

• Save command outputs, object listings, and sync logs under output/alicloud-storage-oss-ossutil/.
• Keep at least one upload or listing result as evidence.

Goals

• Use ossutil 2.0 to manage OSS: upload, download, sync, and resource management.
• Provide a unified CLI flow for install, config, credentials, and region/endpoint handling.

Quick Start Flow

1. Install ossutil 2.0.
2. Configure AK/SK and default region (ossutil config or config file).
3. Run ossutil ls to list buckets, then list objects using the bucket region.
4. Execute upload/download/sync or API-level commands.

Install ossutil 2.0

• See references/install.md for platform-specific install steps.

Configure ossutil

• Interactive configuration:

bash

ossutil config

• Default config file paths:
  • Linux/macOS：~/.ossutilconfig
  • Windows：C:\Users\issuser\.ossutilconfig

Main configuration fields include:

• AccessKey ID
• AccessKey Secret
• Region（example default cn-hangzhou; ask the user if the best region is unclear）
• Endpoint（optional; auto-derived from region if omitted）

AccessKey configuration notes

Use RAM users/roles with least privilege and avoid passing AK in plain text on command line.

Recommended method (environment variables):

bash

export ALICLOUD_ACCESS_KEY_ID="<your-ak>"
export ALICLOUD_ACCESS_KEY_SECRET="<your-sk>"
export ALICLOUD_REGION_ID="cn-beijing"

ALICLOUD_REGION_ID can be used as default region; if unset choose the most reasonable region, ask user if unclear.

Or use the standard shared credentials file:

~/.alibabacloud/credentials

ini

[default]
type = access_key
access_key_id = <your-ak>
access_key_secret = <your-sk>

Command structure (2.0)

• High-level command example:ossutil config
• API-level command example:ossutil api put-bucket-acl

Common command examples

bash

ossutil ls
ossutil ls oss://your-bucket -r --short-format --region cn-shanghai -e https://oss-cn-shanghai.aliyuncs.com
ossutil cp ./local.txt oss://your-bucket/path/local.txt
ossutil cp oss://your-bucket/path/remote.txt ./remote.txt
ossutil sync ./local-dir oss://your-bucket/path/ --delete

Recommended execution flow (list buckets first, then objects)

1. List all buckets

bash

ossutil ls

2. Get target bucket region from output (e.g. oss-cn-shanghai) and convert it to --region format (cn-shanghai).

3. When listing objects, explicitly set --region and -e to avoid cross-region signature/endpoint errors.

bash

ossutil ls oss://your-bucket \
  -r --short-format \
  --region cn-shanghai \
  -e https://oss-cn-shanghai.aliyuncs.com

4. For very large buckets, limit output size first.

bash

ossutil ls oss://your-bucket --limited-num 100
ossutil ls oss://your-bucket/some-prefix/ -r --short-format --region cn-shanghai -e https://oss-cn-shanghai.aliyuncs.com

Common errors and handling

• Error: region must be set in sign version 4.

  • Cause: missing region configuration.
  • Fix: add region in config file, or pass --region cn-xxx.

• The bucket you are attempting to access must be addressed using the specified endpoint

  • Cause: request endpoint does not match bucket region.
  • Fix: use endpoint of the bucket region, e.g. -e https://oss-cn-hongkong.aliyuncs.com.

• Invalid signing region in Authorization header

  • Cause: signature region does not match bucket region.
  • Fix: correct both --region and -e; both must match bucket region.

Credential and security guidance

• Prefer RAM user AK for access control.
• CLI options can override config file, but passing secrets on command line has leakage risk.
• In production, manage secrets via config files or environment variables.

Clarifying questions (ask when uncertain)

1. Is your target a Bucket or an Object?
2. Do you need upload/download/sync, or management actions like ACL/lifecycle/CORS?
3. What are the target region and endpoint?
4. Are you accessing OSS from ECS in the same region (intranet endpoint may be preferred)?

References

• OSSUTIL 2.0 overview and install/config:

  • https://help.aliyun.com/zh/oss/developer-reference/ossutil-overview

• Official source list:references/sources.md

Prerequisites

• Configure least-privilege Alibaba Cloud credentials before execution.
• Prefer environment variables: ALICLOUD_ACCESS_KEY_ID, ALICLOUD_ACCESS_KEY_SECRET, optional ALICLOUD_REGION_ID.
• If region is unclear, ask the user before running mutating operations.

Workflow

1. Confirm user intent, region, identifiers, and whether the operation is read-only or mutating.
2. Run one minimal read-only query first to verify connectivity and permissions.
3. Execute the target operation with explicit parameters and bounded scope.
4. Verify results and save output/evidence files.