smom-dbis-138/docs/archive/status-reports/phase1/COMPLETE_ISSUE_ANALYSIS.md

Complete Issue Analysis and Resolution Plan

Issues Summary

1. SSH Keys Not Configured

Status: ⚠️ Partially Resolved

• Root Cause: Backend VMs have no public IPs, SSH keys not shared between VMs
• Impact: Cannot use SSH to push files from Nginx proxy to backend VMs
• Workaround: Using Azure Run Command (but it has limitations)
• Permanent Solution: Configure SSH key forwarding or use Azure Bastion

2. Azure Run Command Failures

Status: ⚠️ Partially Resolved

• Root Cause:
  • Run Command extension was missing (now reinstalled)
  • Extension fails on complex scripts (variables, conditionals, heredocs)
  • Scripts with special characters or long content fail
• Working: Simple single-line commands (echo "test", wc -c file)
• Failing: Scripts with ${VAR}, $VAR, heredocs, multi-line, long content
• Solution: Use simplest possible commands, one at a time

3. Genesis File Not Deployed

Status: ❌ Not Resolved

• Root Cause: All deployment methods failing due to Azure Run Command limitations
• Attempted Methods:
  1. ❌ Azure Storage + SAS token + curl/wget (fails with Bad Request)
  2. ❌ Nginx HTTP server on port 8080 (connection refused - Nginx not listening)
  3. ❌ Base64 encoded content (too large, fails)
  4. ❌ Chunked base64 (fails with Bad Request)
  5. ❌ Heredoc with file content (fails with Bad Request)
• Current Status: Genesis file still 223 bytes (error XML) on all VMs

Root Cause Analysis

Azure Run Command Limitations

The Azure Run Command service has strict limitations:

1. Script Length: Limited to ~8192 characters
2. Variables: Cannot use shell variables ($VAR, ${VAR})
3. Special Characters: Issues with quotes, backslashes, newlines
4. Complex Logic: Fails on conditionals, loops, heredocs
5. Extension State: Must be properly installed and running

Nginx Port 8080 Issue

• Configuration file exists and is valid
• Nginx reloaded successfully
• But port 8080 is not actually listening
• Possible causes:
  • Config not included in main nginx.conf
  • Port conflict
  • Nginx not binding to port 8080

Solutions

Solution 1: Fix Nginx Port 8080 (Recommended)

1. Add server block directly to /etc/nginx/nginx.conf
2. Ensure it's in the http block
3. Test and reload Nginx
4. Verify port is listening: ss -tlnp | grep 8080
5. Use simple wget command to download

Solution 2: Use Azure Custom Script Extension

• More reliable than Run Command
• Can handle larger files
• Supports file uploads
• Requires storage account or inline script

Solution 3: Configure SSH Keys Properly

1. Generate SSH key pair
2. Copy public key to all VMs (via Terraform or Azure CLI)
3. Use SSH from Nginx proxy to push files
4. Most reliable method for file transfers

Solution 4: Use Azure File Share

1. Create Azure File Share
2. Mount on all VMs
3. Copy genesis file to share
4. VMs access from mounted share

Recommended Approach

Immediate Fix: Fix Nginx port 8080 and use simple wget command

1. Fix Nginx:

   # On Nginx proxy
   sudo tee -a /etc/nginx/nginx.conf > /dev/null << 'EOF'
   server {
       listen 8080;
       server_name localhost;
       root /var/www/genesis;
       location / {
           try_files $uri =404;
       }
   }
   EOF
   sudo nginx -t && sudo systemctl reload nginx
   

2. Deploy Genesis File:

   # Simple wget command (no variables, no conditionals)
   az vm run-command invoke \
     --resource-group <RG> \
     --name <VM> \
     --command-id RunShellScript \
     --scripts "wget http://10.10.1.4:8080/genesis-138.json -O /opt/besu/config/genesis.json"
   

3. Verify and Restart:

   # Verify
   az vm run-command invoke ... --scripts "wc -c /opt/besu/config/genesis.json"
   
   # Set permissions
   az vm run-command invoke ... --scripts "chmod 644 /opt/besu/config/genesis.json"
   
   # Restart Besu
   az vm run-command invoke ... --scripts "cd /opt/besu && docker compose restart besu"
   

Current Status

• ✅ VMs Running: All 5 VMs are running
• ✅ VNet Peerings: Full mesh complete (30 peerings)
• ✅ Network Connectivity: Ping successful (0% packet loss)
• ✅ NSG Rules: Port 8545 allowed, port 8080 rule added
• ✅ Nginx Proxy: Running, genesis file copied
• ⚠️ Nginx Port 8080: Config exists but not listening
• ⚠️ Azure Run Command: Extension reinstalled, simple commands work
• ❌ Genesis File: Not deployed (all methods failing)
• ❌ Besu Containers: Waiting for genesis file
• ❌ RPC Endpoints: Not responding (Besu not started)

Next Steps (Priority Order)

1. Fix Nginx port 8080 - Ensure it's actually listening
2. Deploy genesis file - Use simple wget command once Nginx is working
3. Restart Besu - After genesis file is deployed
4. Test RPC - Verify endpoints are working
5. Configure SSH keys - For future maintenance (optional)

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Last Updated: After complete analysis of all issues