Laravel Multidomain Laravel Package

Technical Evaluation

Architecture Fit

• Multi-Tenant Isolation: The package excels at database, storage, and configuration isolation per domain, aligning with multi-tenant SaaS architectures where shared code serves distinct customers.
• Laravel-Centric: Deeply integrated with Laravel’s core (e.g., Application, QueueServiceProvider), ensuring minimal deviation from standard Laravel workflows.
• Domain-Aware Routing: Leverages $_SERVER['SERVER_NAME'] (customizable) to dynamically load per-domain configs, enabling zero-code changes for domain-specific logic in most cases.
• Storage Segmentation: Automatically isolates storage/ per domain (e.g., storage/site1_com/), reducing collision risks in file-based systems (e.g., uploaded files, caches).

Integration Feasibility

• Low Friction for Laravel Apps: Requires only 3 manual steps (override Application, replace QueueServiceProvider, publish config), making it easy to adopt in existing projects.
• Artisan Command Support: Extends CLI tools (domain:add, domain:remove, domain:update_env) for runtime management, reducing manual config edits.
• Horizon Compatibility: Supports Laravel Horizon with a one-line override, critical for queue-heavy applications.
• SPA/Static Asset Handling: Provides workarounds for domain-specific public storage (e.g., .htaccess hacks), though not natively supported.

Technical Risk

• Bootstrap Override: Modifying bootstrap/app.php is invasive and may conflict with:
  • Custom Laravel bootstrapping logic.
  • Future Laravel version changes (e.g., Laravel 11+ simplifies this).
• Domain Detection Edge Cases:
  • Relies on $_SERVER['SERVER_NAME'] by default, which may fail in:
    • Non-HTTP contexts (e.g., CLI, queues without --domain).
    • Shared hosting where $_SERVER is unreliable (requires custom detection logic).
  • Subdomains vs. Domains: Assumes site1.example.com ≠ site2.example.com; may need regex or custom logic for complex routing.
• Queue Isolation:
  • Database queues require manual setup (e.g., separate QUEUE_DEFAULT per domain) to avoid job mixing.
  • Sync driver lacks domain isolation (jobs run in the same process).
• Storage Link Limitations:
  • storage:link is hardcoded to storage/, requiring manual symlinks for per-domain public assets.
• Config Caching:
  • config:cache generates domain-specific config-*.php files, which may bloat storage for many domains.

Key Questions

1. Domain Routing Complexity:
   • How will domains map to subdirectories (e.g., example.com/site1) vs. subdomains (e.g., site1.example.com)? Does the package support wildcard domains (e.g., *.example.com)?
2. Performance Impact:
   • What’s the overhead of loading per-domain configs/storage on every request? Is config caching (config:cache) recommended for production?
3. Queue Strategy:
   • For database queues, how will we ensure zero job collisions across domains? Will we use separate queue tables or queue namespaces?
4. CI/CD Pipeline:
   • How will environment variables (e.g., APP_ENV) be managed in CI/CD for multi-domain deployments? Will we use domain:update_env or separate .env files?
5. Backup/Disaster Recovery:
   • How will we backup/restore domain-specific storage/configs without affecting others? Are there atomic rollback mechanisms?
6. Monitoring:
   • Can we tag metrics/logs (e.g., Prometheus, Sentry) by domain for per-tenant observability?
7. Upgrade Path:
   • What’s the migration path if we later need to split into microservices? Will domain isolation hinder future decoupling?

Integration Approach

Stack Fit

• Laravel Versions: Supports Laravel 5.5–13.x, but Laravel 10+ is recommended for active maintenance and simpler installation.
• Queue Drivers:
  • Database/SQS/Redis: Fully supported with manual queue isolation required.
  • Sync: Not isolated (jobs run in the same process).
• Storage Systems:
  • Local/Cloud (S3, etc.): Works with per-domain paths (e.g., storage/site1_com/).
  • Database Filesystem: Requires custom table prefixes or separate connections.
• Caching:
  • File/Redis: Per-domain storage paths ensure isolation.
  • Database: May need separate cache tables or key namespacing (e.g., domain:site1:key).
• Authentication:
  • Session/Token-Based: Works if storage is isolated (e.g., storage/site1_com/sessions).
  • Cookie Domains: May require .example.com wildcard or subdomain-specific cookies.

Migration Path

1. Assessment Phase:
   • Audit current domain routing, queue usage, and storage dependencies.
   • Identify high-risk areas (e.g., shared queue tables, global storage links).
2. Pilot Deployment:
   • Start with non-critical domains to test:
     • Domain detection (e.g., $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME']).
     • Queue isolation (e.g., separate QUEUE_DEFAULT per domain).
     • Storage segmentation (e.g., manual symlinks for public assets).
3. Phased Rollout:
   • Phase 1: Add domains via domain:add and validate config/env isolation.
   • Phase 2: Migrate queues to domain-specific workers.
   • Phase 3: Update storage links and public asset handling.
4. Fallback Plan:
   • For high-risk domains, maintain separate Laravel instances until isolation is proven.

Compatibility

Sequencing

1. Bootstrap Override:
   • Replace Application and QueueServiceProvider before adding domains.
2. Domain Setup:
   • Add domains via domain:add and configure per-domain .env files.
3. Queue Configuration:
   • Update queue.php and set up domain-specific workers (e.g., --queue=site1).
4. Storage Isolation:
   • Migrate public assets to domain-specific symlinks.
   • Update filesystems.php for custom public paths.
5. Testing:
   • Validate domain detection, config isolation, and queue jobs.
6. Monitoring:
   • Instrument metrics/logs with domain tags (e.g., domain=site1).

Operational Impact

Maintenance

• Pros:
  • Centralized Domain Management: domain:add/remove/update_env commands reduce manual config edits.
  • Isolated Configs: Per-domain .env files minimize merge conflicts in shared repos.
  • Storage Segmentation: Reduces accidental data leaks between tenants.
• Cons:
  • Config Caching Overhead: config:cache generates domain-specific files, increasing **storage