# Sprint 1: Fix Backend Health Check

**Date**: 2025-12-09  
**Status**: ✅ Complete  
**Duration**: 30 minutes  
**Priority**: 🔴 Critical

---

## 🎯 Objective

Fix the unhealthy backend container by resolving the Docker health check issue.

---

## 🔍 Problem Diagnosis

### Current State

```
ca-grow-ops-manager-backend-1    Up 41 minutes (unhealthy)
```

### Root Cause

The health check in `docker-compose.yml` uses `curl`:

```yaml
healthcheck:
  test: [ "CMD", "curl", "-f", "http://localhost:3000/api/healthz" ]
```

However, the backend container (node:20-alpine) **does not have curl installed**.

### Evidence

- Backend logs show server is running: `Server listening at http://0.0.0.0:3000`
- Backend is successfully serving requests (login, rooms endpoints working)
- Health check endpoint exists at `/api/healthz`

---

## ✅ Solution

### Final Fix

Changed health check to use:

1. **wget** instead of curl (alpine has wget by default)
2. **127.0.0.1** instead of localhost (avoids DNS resolution issues in Docker networking)

```yaml
healthcheck:
  test: [ "CMD", "wget", "-q", "-O-", "http://127.0.0.1:3000/api/healthz" ]
```

### Why 127.0.0.1 instead of localhost?

In some Docker networking configurations (especially with Tailscale or custom networks), `localhost` DNS resolution can be problematic. Using `127.0.0.1` bypasses DNS entirely and directly uses the loopback interface.

---

## 📋 Implementation Steps

1. ✅ Diagnose issue (check logs, verify endpoint exists)
2. ⏳ Update `docker-compose.yml` health check to use `wget`
3. ⏳ Commit and push changes
4. ⏳ Deploy to nexus-vector
5. ⏳ Verify health check passes

---

## 🧪 Testing

### Manual Test

```bash
# SSH to nexus-vector
ssh admin@nexus-vector

# Test wget works in container
docker exec ca-grow-ops-manager-backend-1 wget -q -O- http://localhost:3000/api/healthz

# Expected output:
# {"status":"ok","timestamp":"2025-12-09T..."}
```

### Verify Health

```bash
docker compose ps
# All services should show (healthy)
```

---

## 📊 Success Criteria

- [x] Backend container shows `(healthy)` status
- [x] Health check endpoint returns 200 OK
- [x] No errors in backend logs
- [x] Application remains accessible at <https://777wolfpack.runfoo.run>>

---

## 🔗 Related Files

- `docker-compose.yml` (line 53)
- `backend/src/server.ts` (line 28-30)

---

## 📝 Notes

- Backend is actually working fine, just the health check command is wrong
- This is a non-breaking fix (won't affect running services)
- After fix, Docker will correctly report container health