mql-trading-bots/N8N_SSH_SETUP.md

N8N SSH Setup - Run validate-settings.sh

Overview

Use n8n's SSH node to run the validation script on localhost.

Prerequisites

✅ SSH is running on localhost (confirmed) ✅ User garfield exists

Setup Steps

1. Create SSH Key for n8n (Recommended)

# Generate SSH key (no passphrase for automation)
ssh-keygen -t ed25519 -f ~/.ssh/n8n_key -N ""

# Copy public key to authorized_keys
cat ~/.ssh/n8n_key.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

# Test connection
ssh -i ~/.ssh/n8n_key garfield@localhost "echo 'SSH works!'"

2. Import Workflow

1. Open n8n: http://localhost:5678
2. Click "Add Workflow"
3. Click "Import from File"
4. Select: n8n-workflow-ssh-local.json

3. Configure SSH Credentials

In n8n:

1. Click the "SSH - Run Validation" node
2. Click "Create New Credential"
3. Choose "SSH Password" (or SSH Private Key if you created one)
4. Enter:
   • Host: localhost
   • Port: 22
   • User: garfield
   • Password: Your user password (or path to private key)

4. Configure Telegram (Optional)

1. Get bot token from @BotFather
2. Get chat ID from @userinfobot
3. Add Telegram credentials in n8n

5. Activate

1. Toggle "Active" in top-right
2. Click "Save"

Testing

Manual Trigger

Click "Execute Workflow" to test immediately.

Check Output

The SSH node will return:

• stdout: Script output
• code: Exit code (0 = success, >0 = issues found)

Alternative: Simple HTTP Endpoint

If SSH doesn't work, create a simple HTTP endpoint:

1. Create API Script

sudo tee /usr/local/bin/mql-validate-api.sh << 'EOF'
#!/bin/bash
echo "Content-Type: application/json"
echo ""
cd /home/garfield/mql-trading-bots
OUTPUT=$(./scripts/validate-settings.sh 2>&1)
CODE=$?

if [ $CODE -eq 0 ]; then
    echo '{"status":"ok","message":"All checks passed"}'
else
    echo "{\"status\":\"error\",\"code\":$CODE,\"message\":\"Issues found\",\"stdout\":\"$OUTPUT\"}"
fi
EOF
sudo chmod +x /usr/local/bin/mql-validate-api.sh

2. Setup Python HTTP Server

cd /home/garfield/mql-trading-bots
python3 -m http.server 8080 &

3. Use HTTP Request Node

Import: n8n-workflow-http.json

Troubleshooting

"Connection refused" error

# Check SSH is listening
sudo systemctl status sshd

# Check port
netstat -tlnp | grep 22

"Permission denied" error

# Check file permissions
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

Script not found

# Verify path
ls -la /home/garfield/mql-trading-bots/scripts/validate-settings.sh

Security Notes

• Use SSH keys instead of passwords when possible
• Restrict n8n key to only run validation script in ~/.ssh/authorized_keys:

  command="/home/garfield/mql-trading-bots/scripts/validate-settings.sh",no-pty,no-port-forwarding ssh-ed25519 AAAAC3... n8n@local
  

• Keep n8n behind firewall/VPN

Manual Test

Test the script manually:

/home/garfield/mql-trading-bots/scripts/validate-settings.sh
echo "Exit code: $?"