Session Extension Feature:
- Add JUPYTERHUB_IDLE_CULLER_MAX_EXTENSION env var (default 24h)
- Add SessionInfoHandler and ExtendSessionHandler API endpoints
- Add Session Status card to home page with countdown timer
- Extension tracking in spawner state (resets on server restart)
- Color-coded warnings (yellow <1h, red <30min)
Environment Settings Harmonization:
- Add all ENV defaults to Dockerfile
- Add idle culler settings to compose.yml
- Standardize logo as JUPYTERHUB_LOGO_URI with file:// prefix
- Update NVIDIA_IMAGE to nvidia/cuda:13.0.2-base-ubuntu24.04
- Add notifications page styling (form, textarea, results table)
- Unify button font sizes to 0.8rem across all pages
- Set collapsed user card padding to 0
- Add subtle hover effect on admin user rows (0.015 alpha)
- Style Add Users form panel with dark mode support
- Style authorization and token pages consistently
- docker-sock: mounts /var/run/docker.sock (container orchestration)
- docker-privileged: runs with --privileged flag (hardware access)
Updated pre_spawn_hook to check both groups and set spawner.volumes
or spawner.privileged accordingly. Documentation updated.
Added Volume Architecture diagram showing four persistent volumes per user with Docker host to container mount mapping. Diagram illustrates jupyterlab-{username}_* naming pattern for user-specific volumes (home, workspace, cache) and shared jupyterhub_shared volume. Shows mount points and example contents for each volume type, with note about CIFS mount capability for NAS integration.
Added three mermaid diagrams to README documenting system architecture and workflows. Configuration Flow diagram shows how environment variables from compose.yml flow through jupyterhub_config.py to spawned user containers, including DOCKER_SPAWNER_VOLUMES, VOLUME_DESCRIPTIONS, BUILTIN_GROUPS, pre_spawn_hook, extra_handlers, and template_paths. GPU Auto-Detection diagram illustrates the auto-detect mechanism with temporary CUDA container spawning nvidia-smi for detection. User Self-Service Workflow diagram demonstrates home page state management for restart server and manage volumes features. Converted HTML alert divs to GitHub-style WARNING blocks for better rendering.
Added journal entry #13 documenting release v3.2.11 preparation:
- Git tag creation with annotations
- RELEASE.md delta notes
- Documentation simplification (docker-socket-permissions.md from 66 to 19 lines)
- project.env update with release metadata
- Security warning corrections (host system -> Docker host)
- HTML alert styling for warnings
Updated README.md to explicitly name 'docker-privileged' group in opening
description of privileged access section for clarity.
Restructured README.md following modus primaris approach:
1. Simplified intro (one concise paragraph)
2. Features as bullet points at top
3. User Interface screenshots (with explanations before images)
4. Architecture diagram and explanation
5. Remaining sections (References, Requirements, Quickstart, etc.)
Removed duplicate Features and User Interface sections that were previously
positioned after Architecture. Content now flows logically from high-level
features to visual examples to technical architecture details.
Reordered User Interface section:
- Home control panel (server restart and volume management)
- Volume management screenshots grouped together
- Admin notification broadcast (last)
Changed format: explanation text with heading before each screenshot image,
replacing italic captions below images for better readability.
Added three new documentation files following modus primaris style:
- doc/ui-template-customization.md: Guide for extending JupyterHub UI
templates with RequireJS, Bootstrap 5, CSRF protection, and custom handlers
- doc/docker-socket-permissions.md: Docker socket access control documentation
covering group-based permissions, security implications, and best practices
- doc/notifications.md: Complete notification broadcast system documentation
including implementation details, API integration, error handling, and
troubleshooting
Updated UI screenshots in README.md:
- Replaced screenshot-restart-server.png with screenshot-home.png showing
complete user control panel (restart server + volume management)
- Added screenshot-send-notification.png showing admin notification broadcast
interface with message composer, type selector, and delivery results
All documentation follows consistent structure: brief overview, key facts in
bullet points, explanatory narrative, and technical specifications without
excessive nesting or marketing language.
Implemented comprehensive notification broadcast functionality allowing
administrators to send notifications to all active user JupyterLab servers
simultaneously through a dedicated admin panel.
Core Features:
- Admin-only notification panel accessible at /hub/notifications
- Concurrent delivery to all active servers using asyncio with 5s timeout
- Temporary API token generation (5-minute expiry) for authentication
- Support for 6 notification types: default, info, success, warning, error, in-progress
- 140-character message limit with live character counter
- Auto-close toggle and dismiss button in notifications
- Dynamic endpoint URL construction using spawner.server.base_url
- Comprehensive error handling with user-friendly messages
- One-line logging per server with message preview and outcome
Technical Implementation:
- Created BroadcastNotificationHandler in custom_handlers.py
- Created NotificationsPageHandler for admin UI rendering
- Added notifications.html template with Bootstrap 5 form
- Registered handlers in jupyterhub_config.py extra_handlers
- Sends to /jupyterlab-notifications-extension/ingest endpoint
- Payload includes type, message, autoClose, and actions array
- Navigation link added to home.html for admin access
Integration:
- Requires jupyterlab_notifications_extension installed on JupyterLab servers
- Uses correct payload format (type field, not variant)
- Includes Dismiss action button for manual notification closure
Documentation:
- Updated .claude/CLAUDE.md with complete feature documentation
- Updated README.md Features section with notification broadcast details
- Updated .claude/JOURNAL.md with implementation summary
- Removed obsolete FEATURE_PLAN.md
Version: 3.2.0 (bumped from 3.1.2)
Implemented built-in protected group system enabling admins to grant trusted users read-write Docker socket access within their JupyterLab containers. Groups are managed through admin panel and cannot be permanently deleted.
- Remove fill colors from mermaid diagram nodes
- Keep stroke colors and widths for visual distinction
- Improves compatibility with different GitHub themes (light/dark mode)
- Add mermaid diagram illustrating JupyterHub architecture and user flow
- Move screenshots higher in document under dedicated User Interface section
- Visualize relationships between Traefik, Hub, Spawner, and user containers
- Show per-user volumes and shared storage configuration
- Improve document flow: Architecture -> UI -> Features -> Setup
Documentation enhancements:
- Add comprehensive Features section highlighting key capabilities
- Document GPU auto-detection, user self-service, isolated environments
- Include production-ready features (Traefik, TLS, Watchtower)
- Add Self-Service Volume Management subsection with visual examples
- Include three screenshots demonstrating UI features:
- Restart Server button (active state)
- Manage Volumes button (stopped state)
- Volume selection modal (checkbox interface)
- Position screenshots prominently after feature list
- Provide one-sentence descriptions for each screenshot
Technical updates:
- Increase Stop Server refresh delay to 3 seconds for stability
- Update version to 3.0.14
Screenshots stored in .resources/ directory for future reference
