docs(02-01): complete docker socket configuration plan

Tasks completed: 3/3
- Configure n8n container for Docker access
- Verify Docker API access
- Confirm Docker access working

Decisions:
- Static curl binary mount (hardened image lacks apk)
- --group-add 281 for docker socket permissions

SUMMARY: .planning/phases/02-docker-integration/02-01-SUMMARY.md

.planning/STATE.md

@@ -8,21 +8,21 @@
 ## Current Position
 
 - **Milestone:** v1.0 — Conversational Docker Control
-- **Phase:** 1 of 5 — Foundation (COMPLETE)
+- **Phase:** 2 of 5 — Docker Integration (IN PROGRESS)
-- **Plan:** 2 of 2 complete
+- **Plan:** 1 of 2 complete
-- **Status:** Phase 1 complete, ready for Phase 2
+- **Status:** Executing Phase 2
-- **Last activity:** 2026-01-28 - Completed 01-02-PLAN.md
+- **Last activity:** 2026-01-29 - Completed 02-01-PLAN.md
 
 ## Progress
 
 ```
 Phase 1: Foundation         [██████████] Complete (2/2 plans)
-Phase 2: Docker Integration 🔲 Not started
+Phase 2: Docker Integration [█████░░░░░] In progress (1/2 plans)
 Phase 3: Container Actions  🔲 Not started
 Phase 4: Logs & Intelligence🔲 Not started
 Phase 5: Polish & Deploy    🔲 Not started
 
-Overall: [██░░░░░░░░] 20%
+Overall: [███░░░░░░░] 30%
 ```
 
 ## Recent Decisions
@@ -35,6 +35,8 @@ Overall: [██░░░░░░░░] 20%
 | Hardcoded user ID in workflow | n8n CE blocks env var access in expressions | 2026-01-28 |
 | Silent ignore unauthorized | No false branch nodes, prevents information leak | 2026-01-28 |
 | HTML parse mode | Future formatting flexibility for responses | 2026-01-28 |
+| Static curl binary mount | Hardened n8n image lacks package manager | 2026-01-29 |
+| --group-add 281 for socket | Node user needs docker group for socket access | 2026-01-29 |
 
 ## Pending Todos
 
@@ -46,10 +48,10 @@ Overall: [██░░░░░░░░] 20%
 
 ## Session Continuity
 
-- **Last session:** 2026-01-28
+- **Last session:** 2026-01-29
-- **Stopped at:** Completed 01-02-PLAN.md (Workflow Import and Verification)
+- **Stopped at:** Completed 02-01-PLAN.md (Docker Socket Configuration)
 - **Resume file:** None
-- **Next step:** Plan Phase 2 - Docker Integration
+- **Next step:** Execute 02-02-PLAN.md (Docker Query Workflow)
 
 ---
 *Auto-maintained by GSD workflow*

.planning/phases/02-docker-integration/02-01-SUMMARY.md

@@ -0,0 +1,129 @@
+---
+phase: 02-docker-integration
+plan: 01
+subsystem: infra
+tags: [docker, n8n, unraid, unix-socket, curl]
+
+requires:
+  - phase: 01-foundation
+    provides: n8n workflow with Telegram integration
+
+provides:
+  - Docker socket access from n8n container
+  - curl binary with Unix socket support
+  - Execute Command node enabled in n8n
+
+affects: [02-docker-integration, 03-container-actions]
+
+tech-stack:
+  added: [static-curl]
+  patterns: [unix-socket-api-access, volume-mount-binaries]
+
+key-files:
+  created: []
+  modified: [n8n container configuration]
+
+key-decisions:
+  - "Mount static curl binary instead of installing via package manager (hardened image lacks apk)"
+  - "Use --group-add 281 to grant docker socket access to node user"
+  - "Mount curl from /mnt/user/appdata/n8n/bin/ for persistence across updates"
+
+patterns-established:
+  - "Static binaries mounted as volumes for hardened containers"
+  - "Group-add for socket permissions in rootless containers"
+
+duration: ~45min
+completed: 2026-01-29
+---
+
+# Phase 2 Plan 01: Docker Socket Configuration Summary
+
+**n8n container configured with Docker socket access via mounted static curl binary and group permissions**
+
+## Performance
+
+- **Duration:** ~45 min (interactive configuration)
+- **Started:** 2026-01-29T13:45:00Z
+- **Completed:** 2026-01-29T14:30:00Z
+- **Tasks:** 3
+- **Files modified:** 0 (container configuration only)
+
+## Accomplishments
+
+- Docker socket mounted at `/var/run/docker.sock` in n8n container
+- Static curl binary with Unix socket support mounted at `/usr/local/bin/curl`
+- Execute Command node enabled via `NODES_EXCLUDE=` environment variable
+- Docker group (281) added to container for socket permissions
+- Verified: n8n can query Docker API and retrieve container list
+
+## Task Commits
+
+This plan involved container configuration only - no code changes to commit.
+
+**Configuration changes applied:**
+1. Volume mount: `/var/run/docker.sock` → `/var/run/docker.sock`
+2. Volume mount: `/mnt/user/appdata/n8n/bin/curl` → `/usr/local/bin/curl`
+3. Environment variable: `NODES_EXCLUDE=`
+4. Extra parameter: `--group-add 281`
+
+## Files Created/Modified
+
+No files in repository - all changes were to n8n container configuration in Unraid.
+
+**On Unraid host:**
+- `/mnt/user/appdata/n8n/bin/curl` - Static curl binary downloaded
+
+## Decisions Made
+
+| Decision | Rationale |
+|----------|-----------|
+| Use static curl binary | Hardened n8n image lacks package manager (apk removed) |
+| Mount curl as volume | Persists across container updates unlike in-container installs |
+| Use moparisthebest static-curl | Includes Unix socket support, fully static linked |
+| Add --group-add 281 | Grants docker group access to node user for socket permissions |
+
+## Deviations from Plan
+
+### Discovery: Hardened Image Limitations
+
+- **Found during:** Task 1 (curl installation)
+- **Issue:** n8n hardened image from Docker has no package manager - `apk` command not found
+- **Resolution:** Downloaded static curl binary and mounted as volume
+- **Impact:** More sustainable solution - survives container updates
+
+### Discovery: Dynamic Library Dependencies
+
+- **Found during:** Task 1 (curl installation)
+- **Issue:** Host's `/usr/bin/curl` couldn't be mounted - depends on shared libraries not in container
+- **Resolution:** Used fully static curl binary from moparisthebest/static-curl
+
+### Discovery: Socket Permissions
+
+- **Found during:** Task 2 (Docker API verification)
+- **Issue:** n8n runs as `node` user (uid=1000) but docker socket owned by group 281
+- **Resolution:** Added `--group-add 281` to container extra parameters
+
+---
+
+**Total deviations:** 3 discoveries, all resolved
+**Impact on plan:** Approach adapted for hardened image constraints. Final solution more robust than original plan.
+
+## Issues Encountered
+
+- Initial curl binary lacked Unix socket support (wrong build) - resolved by using correct static build
+- Trailing space in docker.sock path from Unraid UI - resolved by manual re-entry
+- Spurious `docker.sock ` directory created - cleaned up with rmdir
+
+## User Setup Required
+
+None - all configuration completed during execution.
+
+## Next Phase Readiness
+
+- Docker socket access fully working
+- curl can query Docker API from within n8n container
+- Ready for Plan 02-02: Docker query workflow implementation
+
+---
+*Phase: 02-docker-integration*
+*Completed: 2026-01-29*