Migrate Data to Cloud Storage

This document will guide you on how to migrate data from local storage or other cloud platforms to CloudBase Cloud Storage.

Migration Solutions Overview

Choose the appropriate migration solution based on your data source and migration needs:

Data Source	Recommended Tool	Applicable Scenarios	Data Volume
Local Data	COSBrowser	Visual operation, small to medium data volumes	< 10GB
Local Data / Tencent Cloud COS	COSCLI	Command-line operation, batch processing	Any
Third-party Cloud Storage	Cloud Migration CMG, Scripts	Cross-cloud platform migration	Any

I. Local Data Migration to Cloud Storage

Solution 1: COSBrowser (Recommended)

Tool Introduction

COSBrowser is a visual interface tool that supports users to perform data upload, download, generate access links and other functions through a simple interface.

Applicable Scenarios

✅ Small to medium data volume migration (< 10GB)
✅ Need visual operation interface
✅ Batch upload and download files
✅ Manage cloud storage files

Operation Steps

1. Download and Install COSBrowser

Visit COSBrowser Download Page to download and install the client.

2. Login with Secret Key

Important Notice

You must use the Secret Key Login method and specify the bucket name and region. Logging in directly with a Tencent Cloud account cannot manage CloudBase cloud storage buckets.

Open COSBrowser tool
Select "Secret Key Login"
Fill in the following information:
- SecretId / SecretKey: Obtain from Access Key Management
- Bucket Name: Obtain bucket name from CloudBase/Cloud Storage
- Region: Select the region where your environment is located (Cloud Storage is fixed to: ap-shanghai)

3. Upload Local Files

After successful login:

Select the file or folder to upload in the left local file system
Drag and drop to the right cloud storage area, or right-click to select "Upload"
Wait for upload to complete

For detailed usage, please refer to: COSBrowser Usage Documentation

Solution 2: COSCLI

Tool Introduction

COSCLI is a client command-line tool built with Golang, no need to install dependent environments, ready to use out of the box. You can perform batch upload, download, delete and other operations on objects in cloud storage through simple command-line instructions.

Technical Support Notice

The COSCLI tool is maintained by the Tencent Cloud COS team. The CloudBase team does not provide technical support for this tool. Using this tool requires certain command-line operation and technical foundation. If you encounter tool-related issues, please refer to COSCLI Official Documentation or contact the COS team.

Applicable Scenarios

✅ Large number of files batch migration
✅ Automated script deployment
✅ Familiar with command-line operations
✅ Support cross-bucket operations

For detailed usage, please refer to: COSCLI Tool Documentation

II. Third-party Cloud Storage Migration to Cloud Storage

Solution: Cloud Migration CMG

Cloud Migration (CMG) is a migration tool integration and monitoring platform provided by Tencent Cloud. If your data is stored in third-party cloud platforms such as Alibaba Cloud OSS, AWS S3, etc., you can use the Cloud Migration CMG service to quickly migrate to CloudBase Cloud Storage.

Supported Cloud Platforms

Cloud Migration CMG supports migrating data from the following cloud platforms:

Cloud Platform	Migration Tutorial
Alibaba Cloud OSS	Alibaba Cloud OSS Migration Tutorial
AWS S3	AWS S3 Migration Tutorial
Qiniu Cloud	Qiniu Cloud Migration Tutorial
Upyun	Upyun Migration Tutorial
Huawei Cloud OBS	Huawei Cloud OBS Migration Tutorial
Kingsoft Cloud KS3	Kingsoft Cloud KS3 Migration Tutorial
Baidu Cloud BOS	Baidu Cloud BOS Migration Tutorial

III. LeanCloud Storage Migration to CloudBase

Solution: Using Migration Script Tool

Download Migration Script

This migration solution requires the official migration script tool. Please download the script package first:

➡️ Download LeanCloud Migration Tool

🚀 After downloading and extracting to local, please carefully read the README.md document and follow the steps below for configuration and execution.

The migration script tool can help you batch migrate files stored in LeanCloud to CloudBase Cloud Storage.

Features

✅ Read all file metadata from LeanCloud _File table
✅ Automatically concatenate URLs and batch download files
✅ Batch upload to CloudBase Cloud Storage
✅ Support concurrency control to improve migration efficiency
✅ Automatically retry failed downloads
✅ Generate detailed migration reports

Project Structure

Original Structure (After Extraction)

This is the file structure you see after extracting the zip package:

leancloud_storage_migrate/
├── migrate.js              # Main migration script (core file)
├── package.json            # Project dependency configuration file
└── README.md               # Project documentation

Note

These 3 files are the original project files and need to be manually configured before use.

Structure After Installing Dependencies and Running Script

leancloud_storage_migrate/
├── migrate.js              # Main migration script (core file)
├── package.json            # Project dependency configuration file
├── package-lock.json       # Dependency version lock file (auto-generated)
├── README.md               # Project documentation
├── .gitignore             # Git ignore file configuration
├── node_modules/          # Dependency package directory (generated after npm install)
├── temp_files/            # Temporary file storage directory (auto-created at runtime, auto-deleted after completion)
└── migration_report.json  # Migration report file (generated after completion)

Quick Start

Step 1: Install Node.js Dependencies

Run the following command in the project directory to install the required dependencies:

cd /path/to/leancloud_storage_migrate
npm install

This will automatically install the following dependency packages:

leancloud-storage - LeanCloud SDK
@cloudbase/node-sdk - CloudBase Node.js SDK

Step 2: Configure Parameters

Open the migrate.js file, find the configuration area (around lines 17-32), and fill in your configuration information:

// LeanCloud configuration
const LEANCLOUD_CONFIG = {
  appId: 'YOUR_LEANCLOUD_APP_ID',        // 👈 Replace with your LeanCloud App ID
  appKey: 'YOUR_LEANCLOUD_APP_KEY',      // 👈 Replace with your LeanCloud App Key
  serverURL: 'https://YOUR_LEANCLOUD_SERVER_URL', // 👈 Replace with your API domain
  fileDomain: 'https://YOUR_FILE_DOMAIN' // 👈 Replace with your file domain
};

// CloudBase configuration
const CLOUDBASE_CONFIG = {
  env: 'YOUR_ENV_ID',              // CloudBase environment ID
  secretId: 'YOUR_SECRET_ID',       // Tencent Cloud API key SecretId
  secretKey: 'YOUR_SECRET_KEY'      // Tencent Cloud API key SecretKey
};

How to Get Configuration Information

LeanCloud Configuration:

Login to LeanCloud Console
Select your application
Go to "Settings" → "App Credentials" to get App ID and App Key
Go to "Settings" → "Domain Binding" to get API domain (serverURL) and file domain (fileDomain)

CloudBase Configuration:

Login to CloudBase Platform
Select your environment to get the environment ID (env)
Login to Tencent Cloud API Key Management
Create or view keys to get SecretId and SecretKey

⚠️ Important: Configure Security Domains

Login to CloudBase Platform
Go to "Environment Management" → "Security Sources"
Add your domain to the security domain list (to avoid CORS errors)

Step 3: Run Migration Script

After configuration is complete, execute the following command to start migration:

npm start

Or run directly with Node.js:

node migrate.js

Step 4: View Results

The script will display progress information in real-time during execution:

========================================
LeanCloud → CloudBase File Migration Tool
========================================

Starting to query _File table from LeanCloud...
Queried 50 files...
✓ Total 50 files queried

Starting file migration, concurrency: 5
----------------------------------------

[1] Processing file: example.jpg
  Download URL: https://xxx.com/xxx.jpg
  Downloading...
  ✓ Download complete
  Uploading to CloudBase: migrated/example.jpg
  ✓ Upload complete, fileID: cloud://xxx...

[2] Processing file: photo.png
  Download URL: https://xxx.com/yyy.png
  Downloading...
  ✓ Download complete
  Uploading to CloudBase: migrated/photo.png
  ✓ Upload complete, fileID: cloud://yyy...

...

========================================
Migration Complete!
----------------------------------------

Total: 50 files
Success: 48
Failed: 2

Migration report saved to: ./migration_report.json

After completion, a migration_report.json report file will be generated in the current directory.

Optional Configuration

You can adjust the following configuration to optimize migration performance:

const DOWNLOAD_CONFIG = {
  tempDir: './temp_files',  // Temporary file storage directory
  concurrency: 5,          // Concurrent download count (recommended 3-10)
  retryTimes: 3,           // Download failure retry times
  timeout: 30000           // Request timeout (milliseconds)
};

Migration Process

Query File List: Query all files from LeanCloud _File table
Download Files: Concatenate URLs based on key and download to local temporary directory
Upload Files: Upload files to CloudBase Cloud Storage
Generate Report: Generate migration_report.json report file
Clean Temporary Files: Delete local temporary files

Output Results

After migration completion, a migration_report.json report file will be generated, containing:

{
  "timestamp": "2026-01-21T10:30:00.000Z",
  "summary": {
    "total": 100,
    "success": 98,
    "failed": 2
  },
  "successList": [
    {
      "objectId": "xxx",
      "name": "example.jpg",
      "fileID": "cloud://xxx.cloudbase.net/xxx",
      "cloudPath": "migrated/example.jpg"
    }
  ],
  "errorList": [
    {
      "objectId": "yyy",
      "name": "failed.png",
      "error": "Download timeout"
    }
  ]
}

Notes

Network Stability: Ensure stable network connection, large file migration may take a long time
Disk Space: Ensure sufficient disk space to store temporary files
Concurrency Count: Adjust concurrency based on network bandwidth to avoid request failures due to excessive concurrency
Retry Mechanism: Failed files will be automatically retried, final failures will be recorded in the report
Cloud Path: All files will be uploaded to the migrated/ directory, can be modified as needed
fileID Preservation: The fileID after upload will be recorded in the report, it is recommended to save for future use

Troubleshooting

Download Failed

Check if fileDomain configuration is correct
Check if network connection is normal
Try increasing timeout timeout duration

Upload Failed

Confirm CloudBase environment ID is correct
Check if security domains are configured
Confirm if cloud storage quota is sufficient

CORS Error

Login to CloudBase Console
Add your domain in "Security Configuration" → "Security Sources"

IV. Frequently Asked Questions

1. How to Improve Migration Speed?

Use COSCLI tool's concurrent upload feature
Choose the same region as the source data to reduce network latency
Use high-bandwidth network for transmission
For small files, you can package them before uploading and then extract

2. What Fees Will Migration Incur?

Storage Fees: Charged based on actual storage volume
Traffic Fees: CDN traffic fees

For details, see: CloudBase Billing Description

Migrate Data to Cloud Storage

Migration Solutions Overview​

I. Local Data Migration to Cloud Storage​

Solution 1: COSBrowser (Recommended)​

Tool Introduction​

Applicable Scenarios​

Operation Steps​

Solution 2: COSCLI​

Tool Introduction​

Applicable Scenarios​

II. Third-party Cloud Storage Migration to Cloud Storage​

Solution: Cloud Migration CMG​

Supported Cloud Platforms​

III. LeanCloud Storage Migration to CloudBase​

Solution: Using Migration Script Tool​

Features​

Project Structure​

Original Structure (After Extraction)​

Structure After Installing Dependencies and Running Script​

Quick Start​

Optional Configuration​

Migration Process​

Output Results​

Notes​

Troubleshooting​

IV. Frequently Asked Questions​

1. How to Improve Migration Speed?​

2. What Fees Will Migration Incur?​

Migration Solutions Overview

I. Local Data Migration to Cloud Storage

Solution 1: COSBrowser (Recommended)

Tool Introduction

Applicable Scenarios

Operation Steps

Solution 2: COSCLI

Tool Introduction

Applicable Scenarios

II. Third-party Cloud Storage Migration to Cloud Storage

Solution: Cloud Migration CMG

Supported Cloud Platforms

III. LeanCloud Storage Migration to CloudBase

Solution: Using Migration Script Tool

Features

Project Structure

Original Structure (After Extraction)

Structure After Installing Dependencies and Running Script

Quick Start

Optional Configuration

Migration Process

Output Results

Notes

Troubleshooting

IV. Frequently Asked Questions

1. How to Improve Migration Speed?

2. What Fees Will Migration Incur?