Cloud Storage

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Cloud Storage Configuration for MediaWiki

This article details the configuration of cloud storage for your MediaWiki 1.40 installation. Utilizing cloud storage enhances scalability, reliability, and cost-effectiveness for storing uploaded files (images, documents, etc.). We will cover setup with Amazon S3, but the principles apply to other compatible services like Google Cloud Storage or Azure Blob Storage with appropriate adapter adjustments.

Understanding the Requirements

Before beginning, ensure you have:

  • An active account with a cloud storage provider (e.g., Amazon Web Services).
  • A configured bucket/container within that provider.
  • Appropriate credentials (Access Key ID and Secret Access Key for AWS S3). *Never* hardcode these directly into your configuration files; use environment variables or a secure configuration management system.
  • The `wfLoadExtensions()` function correctly configured in your `LocalSettings.php` file to load the required extension. We'll be using the `CloudStorage` extension, which is essential. See Manual:Configuration for details on extension loading.
  • Familiarity with basic Help:Editing pages and Help:Linking and referencing within MediaWiki.

Installing and Configuring the CloudStorage Extension

1. **Download the Extension:** Obtain the `CloudStorage` extension from the MediaWiki website: Extension:CloudStorage. Download the latest stable release. 2. **Extract the Extension:** Extract the downloaded archive into your MediaWiki extensions directory (typically `/var/www/html/extensions/`). 3. **Configure `LocalSettings.php`:** Add the following to your `LocalSettings.php` file. Replace placeholders with your specific values.

```wiki wfLoadExtension( 'CloudStorage' );

$wgStorageSearchPaths['S3'] = array( 

   'bucket' => 'your-s3-bucket-name',
   'region' => 'your-s3-region', // e.g., 'us-east-1'
   'key'    => getenv('AWS_ACCESS_KEY_ID'), // Use environment variable
   'secret' => getenv('AWS_SECRET_ACCESS_KEY'), // Use environment variable
   'endpoint' => 's3.amazonaws.com' // or your specific endpoint

);

$wgHashedUploads = true; $wgUploadDirectory = '/var/www/html/uploads'; //Important to set this, even with cloud storage ```

S3 Bucket Configuration

The S3 bucket needs to be properly configured for MediaWiki. Here’s a breakdown of the necessary settings:

Setting Value
Bucket Permissions Public Read Access (carefully consider security implications. Object ownership should be set to the account that will be accessing the bucket.)
Bucket Region The AWS region where the bucket is located (e.g., us-east-1, eu-west-2).
CORS Configuration Configure Cross-Origin Resource Sharing (CORS) to allow requests from your MediaWiki server's domain. See Amazon S3 CORS for details.
Bucket Policy A policy granting MediaWiki the necessary permissions to upload, delete, and read objects.

Advanced Configuration Options

The `CloudStorage` extension offers several advanced options. These are configured within `LocalSettings.php`.

Option Description
`$wgCloudStorageDefaultProvider` Sets the default cloud storage provider. Useful if you have multiple providers configured.
`$wgCloudStorageCacheTTL` Sets the cache Time-To-Live (TTL) for S3 metadata. Helps reduce API calls.
`$wgCloudStorageObjectPrefix` Prefix for all objects stored in the cloud. Useful for organizing files.
`$wgCloudStorageVerifySSL` Whether to verify the SSL certificate of the S3 endpoint. Set to `false` if you encounter SSL issues, but this is *not* recommended for production environments.

Troubleshooting & Common Issues

  • **Permission Denied Errors:** Double-check your bucket policy and IAM roles. Ensure the MediaWiki server has the necessary permissions to access the bucket. Refer to Amazon S3 Permissions for detailed guidance.
  • **CORS Issues:** If you receive CORS-related errors, review your bucket's CORS configuration. Ensure it allows requests from your MediaWiki server's domain.
  • **SSL Verification Errors:** If `$wgCloudStorageVerifySSL` is set to `true` and you encounter SSL errors, try setting it to `false` *temporarily* for testing, but resolve the underlying SSL issue for production. Consider updating your server's CA certificates.
  • **File Upload Failures:** Check your MediaWiki Manual:Configuring files settings, especially `$wgUploadDirectory`. Ensure it’s correctly configured, even though files are ultimately stored in the cloud.
  • **Extension Not Loading:** Verify the extension is correctly placed in the `extensions` directory and that `wfLoadExtension()` is called correctly in `LocalSettings.php`. Consult Manual:Extensions for more information.

Performance Considerations

Consideration Recommendation
Network Latency Choose a cloud region geographically close to your MediaWiki server.
API Request Rate Cache S3 metadata using `$wgCloudStorageCacheTTL`.
Object Size For large files, consider using multipart uploads for improved reliability.
S3 Storage Class Choose an appropriate S3 storage class (e.g., Standard, Intelligent-Tiering) based on access frequency and cost requirements. See Amazon S3 Storage Classes.

Security Best Practices

  • **Least Privilege:** Grant the MediaWiki server only the minimum necessary permissions to access the S3 bucket.
  • **Environment Variables:** Never hardcode AWS credentials in your `LocalSettings.php` file. Use environment variables or a secure configuration management system.
  • **Bucket Policies:** Regularly review and update your bucket policies.
  • **Encryption:** Enable server-side encryption on your S3 bucket.
  • **Monitoring:** Monitor S3 access logs for any suspicious activity. See Amazon CloudWatch.

Further Resources


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