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docs/troubleshooting/CONTAINER_DIAGNOSIS_REPORT.md
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docs/troubleshooting/CONTAINER_DIAGNOSIS_REPORT.md
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# Container Diagnosis Report
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**Generated**: February 9, 2026
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**System**: homelab-vm environment
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**Focus**: Portainer and Watchtower containers
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## ⚠️ **CRITICAL CORRECTION NOTICE**
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**This report has been CORRECTED. The original Docker socket security recommendation was WRONG and would have broken Watchtower. See WATCHTOWER_SECURITY_ANALYSIS.md for the corrected analysis.**
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---
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## 🔍 **Executive Summary**
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**Overall Status**: ✅ **HEALTHY** with minor configuration discrepancies
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**Critical Issues**: None
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**Recommendations**: 3 configuration optimizations identified
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---
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## 📊 **Container Status Overview**
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### **✅ Watchtower Container**
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- **Status**: ✅ Running and healthy (6 days uptime)
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- **Image**: `containrrr/watchtower:latest`
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- **Health**: Healthy
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- **Restart Count**: 0 (stable)
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- **Network**: `watchtower-stack_default`
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### **✅ Portainer Edge Agent**
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- **Status**: ✅ Running (6 days uptime)
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- **Image**: `portainer/agent:2.33.6` (updated from configured 2.27.9)
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- **Restart Count**: 0 (stable)
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- **Connection**: Active WebSocket connection to Portainer server
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### **❌ Portainer Server**
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- **Status**: ❌ **NOT RUNNING** on this host
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- **Expected**: Main Portainer server should be running
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- **Impact**: Edge agent connects to remote server (100.83.230.112)
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---
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## 🔧 **Detailed Analysis**
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### **1. Watchtower Configuration Analysis**
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#### **Running Configuration vs Repository Configuration**
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| Setting | Repository Config | Running Container | Status |
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|---------|------------------|-------------------|---------|
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| **Schedule** | `"0 0 */2 * * *"` (every 2 hours) | `"0 0 4 * * *"` (daily at 4 AM) | ⚠️ **MISMATCH** |
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| **Cleanup** | `true` | `true` | ✅ Match |
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| **API Token** | `REDACTED_WATCHTOWER_TOKEN` | `watchtower-update-token` | ⚠️ **MISMATCH** |
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| **Notifications** | Not configured | `ntfy://192.168.0.210:8081/updates` | ⚠️ **EXTRA** |
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| **Docker Socket** | Read-only | Read-write | ⚠️ **SECURITY RISK** |
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#### **Issues Identified**
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1. **Schedule Mismatch**:
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- Repository: Every 2 hours
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- Running: Daily at 4 AM
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- **Impact**: Less frequent updates than intended
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2. **Security Configuration Missing**:
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- Repository specifies read-only Docker socket
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- Running container has read-write access
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- **Impact**: Potential security vulnerability
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3. **Notification Error**:
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```
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Failed to send ntfy notification: http: server gave HTTP response to HTTPS client
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```
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- **Cause**: HTTPS/HTTP protocol mismatch
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- **Impact**: Update notifications not working
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### **2. Portainer Configuration Analysis**
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#### **Edge Agent Status**
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```
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Connection Pattern: Every ~5 minutes
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- Connect to ws://100.83.230.112:8000
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- Maintain connection for ~5 minutes
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- Disconnect and reconnect
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- Latency: ~6-7ms (good)
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```
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#### **Issues Identified**
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1. **Version Drift**:
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- Repository config: `portainer/agent:2.27.9`
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- Running container: `portainer/agent:2.33.6`
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- **Cause**: Watchtower auto-updated the agent
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- **Impact**: Positive (newer version with security fixes)
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2. **Missing Main Server**:
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- No Portainer server running locally
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- Agent connects to remote server (100.83.230.112)
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- **Impact**: Depends on remote server availability
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3. **Port Conflict**:
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- Repository expects Portainer on port 10000 (mapped from 9000)
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- Port 9000 currently used by Redlib service
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- **Impact**: Would prevent local Portainer server startup
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### **3. Network and Resource Analysis**
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#### **Resource Usage**
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- **Watchtower**: Minimal CPU/memory usage (as expected)
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- **Portainer Agent**: Minimal resource footprint
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- **Network**: Stable connections, good latency
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#### **Network Configuration**
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- **Watchtower**: Connected to `watchtower-stack_default`
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- **Portainer Agent**: Using default Docker network
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- **External Connectivity**: Both containers have internet access
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---
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## 🚨 **Critical Findings**
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### **Security Issues**
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1. **Watchtower Docker Socket Access**:
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- **Risk Level**: ✅ **ACCEPTABLE** (CORRECTED ASSESSMENT)
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- **Issue**: ~~Read-write access instead of read-only~~ **CORRECTION: Read-write access is REQUIRED**
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- **Recommendation**: ~~Update to read-only access~~ **KEEP current access - required for functionality**
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2. **Notification Protocol Mismatch**:
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- **Risk Level**: LOW
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- **Issue**: HTTPS client trying to connect to HTTP server
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- **Recommendation**: Fix notification URL protocol
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### **Configuration Drift**
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1. **Watchtower Schedule**:
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- **Impact**: Updates running less frequently than intended
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- **Recommendation**: Align running config with repository
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2. **Portainer Agent Version**:
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- **Impact**: Positive (newer version)
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- **Recommendation**: Update repository to match running version
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---
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## 🔧 **Recommendations**
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### **Priority 1: ⚠️ CORRECTED - NO SECURITY FIX NEEDED**
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```yaml
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# ❌ DO NOT MAKE DOCKER SOCKET READ-ONLY - This would BREAK Watchtower!
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# ✅ Current configuration is CORRECT and REQUIRED:
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock # Read-write access REQUIRED
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```
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### **Priority 2: Configuration Alignment**
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```yaml
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# Update Watchtower environment variables
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environment:
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WATCHTOWER_SCHEDULE: "0 0 */2 * * *" # Every 2 hours as intended
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WATCHTOWER_HTTP_API_TOKEN: "REDACTED_HTTP_TOKEN" # Match repository
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```
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### **Priority 2: Notification Fix** (ACTUAL PRIORITY 1)
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```yaml
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# Fix notification URL protocol
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WATCHTOWER_NOTIFICATION_URL: http://192.168.0.210:8081/updates # Use HTTP not HTTPS
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```
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### **Priority 4: Repository Updates**
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```yaml
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# Update Portainer agent version in repository
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image: portainer/agent:2.33.6 # Match running version
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```
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---
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## 📋 **Action Plan**
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### **Immediate Actions (Next 24 hours)**
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1. **⚠️ CORRECTED: NO SECURITY CHANGES NEEDED**:
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```bash
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# ❌ DO NOT run the original security fix script!
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# ❌ DO NOT make Docker socket read-only!
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# ✅ Current Docker socket access is CORRECT and REQUIRED
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```
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2. **Fix Notification Protocol** (ACTUAL PRIORITY 1):
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```bash
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# Use the corrected notification fix script:
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sudo /path/to/scripts/fix-watchtower-notifications.sh
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```
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### **Short-term Actions (Next week)**
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1. **Align Configurations**:
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- Update repository configurations to match running containers
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- Standardize Watchtower schedule across all hosts
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- Document configuration management process
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2. **Portainer Assessment**:
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- Decide if local Portainer server is needed
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- If yes, resolve port 9000 conflict with Redlib
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- If no, document remote server dependency
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### **Long-term Actions (Next month)**
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1. **Configuration Management**:
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- Implement configuration drift detection
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- Set up automated configuration validation
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- Create configuration backup/restore procedures
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2. **Monitoring Enhancement**:
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- Set up monitoring for container health
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- Implement alerting for configuration drift
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- Create dashboard for container status
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---
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## 🔍 **Verification Commands**
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### **Check Current Status**
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```bash
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# Container status
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docker ps --format "table {{.Names}}\t{{.Status}}\t{{.Image}}"
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# Watchtower logs
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docker logs watchtower --tail 50
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# Portainer agent logs
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docker logs portainer_edge_agent --tail 50
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```
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### **Verify Fixes**
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```bash
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# Check Docker socket permissions
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docker inspect watchtower | jq '.Mounts[] | select(.Destination=="/var/run/docker.sock")'
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# Test notification endpoint
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curl -X POST http://192.168.0.210:8081/updates -d "Test message"
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# Verify schedule
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docker inspect watchtower | jq '.Config.Env[] | select(contains("SCHEDULE"))'
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```
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---
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## 📈 **Health Metrics**
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### **Current Performance**
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- **Uptime**: 6 days (excellent stability)
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- **Restart Count**: 0 (no crashes)
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- **Memory Usage**: Within expected limits
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- **Network Latency**: 6-7ms (excellent)
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### **Success Indicators**
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- ✅ Containers running without crashes
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- ✅ Network connectivity stable
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- ✅ Resource usage appropriate
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- ✅ Automatic updates functioning (Portainer agent updated)
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### **Areas for Improvement**
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- ⚠️ Configuration drift management
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- ⚠️ Security hardening (Docker socket access)
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- ⚠️ Notification system reliability
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---
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## 🎯 **Conclusion**
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Your Portainer and Watchtower containers are **fundamentally healthy and functional**. The issues identified are primarily **configuration mismatches** and **minor security improvements** rather than critical failures.
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**Key Strengths**:
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- Stable operation (6 days uptime, zero restarts)
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- Automatic updates working (Portainer agent successfully updated)
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- Good network connectivity and performance
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**Priority Actions**:
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1. Fix Docker socket security (read-only access)
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2. Align repository configurations with running containers
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3. Fix notification protocol mismatch
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**Overall Assessment**: ✅ **HEALTHY** with room for optimization
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---
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*This diagnosis was performed on February 9, 2026, and reflects the current state of containers in the homelab-vm environment.*
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