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Multi-Instance n8n Self-Hosting Guide
Source: Dev.to | Jan 22, 2026 (UTC)
Docker, PostgreSQL, and Cloudflare Zero Trust Tunnels
Version : 2.0
Last Updated : January 2026
Target Audience : Development Team
This guide provides production-grade configurations for running multiple isolated n8n instances (Production and Development) on a remote Ubuntu server using Docker, with secure external access through Cloudflare Zero Trust tunnels. Each instance has its own database, encryption key, and subdomain.
Prerequisites: Remote Server Access
This guide assumes you have:
✅ A remote Ubuntu server with Docker installed
✅ SSH access to the server via Cloudflare Tunnel
✅ SSH key authentication configured
✅ A domain managed by Cloudflare
To connect to your server:
ssh myserver
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Note: All commands in the “SERVER” sections should be run after SSHing into your server. Commands marked “CLIENT” are run on your local machine.
Setup your SSH server access
Follow this guide to setup cloudflare tunnel SSH connection to your own server (Prerequisite) -> Guide
Table of Contents
Architecture Overview Tunnel Strategy Ubuntu Desktop Server Preparation Create n8n Tunnel in Cloudflare Directory and File Setup Environment Variables Configuration Docker Compose Configuration Configure Public Hostnames Securing the Development Instance Deployment First-Time n8n Setup Verification and Testing Backup Procedures Troubleshooting Quick Reference
1. Architecture Overview
System Architecture
Key Design Principles
Principle
Implementation
Data Isolation
Separate PostgreSQL databases per n8n instance
Credential Isolation
Unique encryption keys per instance
Network Segmentation
Internal backend networks for databases
Zero Trust Access
Cloudflare Access protects dev instance
No Port Exposure
All access through Cloudflare Tunnels
Separate Tunnels
SSH tunnel independent from n8n tunnel
2. Tunnel Strategy
You already have a Cloudflare Tunnel running for SSH access. For n8n, we’ll create a separate tunnel because:
SSH Tunnel
n8n Tunnel
Uses network_mode: host
Uses Docker network
Routes to localhost:22
Routes to container names (n8n-prod:5678)
Runs standalone
Runs in docker-compose with n8n
Already configured ✓
Will configure now
Your tunnels after setup:
Tunnel
Purpose
Hostnames
Existing (SSH)
Remote server access
ssh.yourdomain.com
New (n8n)
n8n web interfaces
n8n-prod.yourdomain.com, n8n-dev.yourdomain.com
3. Ubuntu Desktop Server Preparation
Run these commands on SERVER (via SSH)
ssh myserver
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3.1 Disable Sleep/Suspend (If Ubuntu Desktop)
Skip this section if running Ubuntu Server (headless).
# Mask sleep targets sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target # Configure logind sudo nano /etc/systemd/logind.conf
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Add:
[Login] HandleLidSwitch=ignore HandleLidSwitchExternalPower=ignore HandleLidSwitchDocked=ignore HandlePowerKey=ignore HandleSuspendKey=ignore IdleAction=ignore
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Apply:
sudo systemctl restart systemd-logind.service
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For GNOME desktop:
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'nothing' gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout 0 gsettings set org.gnome.desktop.session idle-delay 0
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3.2 Verify Docker Installation
docker --version docker compose version
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If Docker is not installed, see Appendix A: Docker Installation .
4. Create n8n Tunnel in Cloudflare
Do this in your web browser (on CLIENT)
Open Cloudflare Zero Trust Dashboard
Go to Networks → Tunnels
Click Create a tunnel
Select Cloudflared as connector type
Name it: n8n-stack (or similar)
Select Docker as environment
Copy the token from the command shown (starts with eyJ...)
Save this token – you’ll add it to your .env file in the next section.
Don’t configure public hostnames yet – we’ll do that after deployment.
5. Directory and File Setup
Run these commands on SERVER (via SSH)
ssh myserver
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5.1 Create Project Directory
mkdir -p ~/n8n-stack cd ~/n8n-stack
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5.2 Create .gitignore
cat > .gitignore << 'EOF' .env *.backup *.dump *.sql *.log EOF
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5.3 Directory Structure
After setup, your directory will look like:
~/n8n-stack/ ├── docker-compose.yml # Service definitions ├── .env # Secrets (chmod 600) ├── .gitignore # Excludes .env from git └── backup.sh # Backup script (optional)
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6. Environment Variables Configuration
Run these commands on SERVER (via SSH)
6.1 Generate Secure Values
cd ~/n8n-stack # Generate encryption keys (save these!) echo "Production Encryption Key: $(openssl rand -hex 32)" echo "Development Encryption Key: $(openssl rand -hex 32)" # Generate database passwords echo "Production DB Password: $(openssl rand -base64 24)" echo "Development DB Password: $(openssl rand -base64 24)"
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Copy these values – you’ll need them for the .env file.
6.2 Create Environment File
nano .env
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Add the following (replace placeholders with your values):
# ============================================ # PRODUCTION DATABASE # ============================================ POSTGRES_PROD_USER=n8n_prod POSTGRES_PROD_PASSWORD=YOUR_GENERATED_PROD_DB_PASSWORD POSTGRES_PROD_DB=n8n_production # ============================================ # DEVELOPMENT DATABASE # ============================================ POSTGRES_DEV_USER=n8n_dev POSTGRES_DEV_PASSWORD=YOUR_GENERATED_DEV_DB_PASSWORD POSTGRES_DEV_DB=n8n_development # ============================================ # n8n PRODUCTION # ============================================ N8N_PROD_HOST=n8n-prod.yourdomain.com N8N_PROD_ENCRYPTION_KEY=YOUR_GENERATED_PROD_ENCRYPTION_KEY # ============================================ # n8n DEVELOPMENT # ============================================ N8N_DEV_HOST=n8n-dev.yourdomain.com N8N_DEV_ENCRYPTION_KEY=YOUR_GENERATED_DEV_ENCRYPTION_KEY # ============================================ # SHARED CONFIGURATION # ============================================ TIMEZONE=Asia/Kolkata # ============================================ # CLOUDFLARE TUNNEL (n8n tunnel, NOT SSH tunnel) # ============================================ TUNNEL_TOKEN=YOUR_N8N_TUNNEL_TOKEN_FROM_STEP_4
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Replace:
yourdomain.com → Your actual domain
YOUR_GENERATED_* → Values from step 6.1
YOUR_N8N_TUNNEL_TOKEN_FROM_STEP_4 → Token from Cloudflare dashboard
TIMEZONE → Your timezone (e.g., America/New_York, Europe/London)
6.3 Secure the File
chmod 600 .env ls -la .env # Should show: -rw------- (only owner can read/write)
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6.4 Critical Warnings
⚠️ ENCRYPTION KEY WARNINGS
Set keys BEFORE first launch – they’re stored in the database on first run
NEVER change keys after credentials are saved – you’ll lose all stored credentials permanently
Back up your .env file securely – without encryption keys, credential recovery is impossible
Use DIFFERENT keys for prod and dev – prevents cross-instance issues
7. Docker Compose Configuration
Run on SERVER (via SSH)
cd ~/n8n-stack nano docker-compose.yml
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Paste the complete configuration:
services: # ============================================ # PRODUCTION INSTANCE # ============================================ postgres-prod: image: postgres:16-alpine container_name: n8n-postgres-prod restart: unless-stopped environment: - POSTGRES_USER=${POSTGRES_PROD_USER} - POSTGRES_PASSWORD=${POSTGRES_PROD_PASSWORD} - POSTGRES_DB=${POSTGRES_PROD_DB} volumes: - postgres_prod_data:/var/lib/postgresql/data networks: - backend-prod healthcheck: test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_PROD_USER} -d ${POSTGRES_PROD_DB}"] interval: 10s timeout: 5s retries: 5 start_period: 30s n8n-prod: image: docker.n8n.io/n8nio/n8n:latest container_name: n8n-prod restart: unless-stopped environment: # Database Configuration - DB_TYPE=postgresdb - DB_POSTGRESDB_HOST=postgres-prod - DB_POSTGRESDB_PORT=5432 - DB_POSTGRESDB_DATABASE=${POSTGRES_PROD_DB} - DB_POSTGRESDB_USER=${POSTGRES_PROD_USER} - DB_POSTGRESDB_PASSWORD=${POSTGRES_PROD_PASSWORD} # n8n Configuration - N8N_HOST=${N8N_PROD_HOST} - N8N_PORT=5678 - N8N_PROTOCOL=https - WEBHOOK_URL=https://${N8N_PROD_HOST}/ - N8N_ENCRYPTION_KEY=${N8N_PROD_ENCRYPTION_KEY} - GENERIC_TIMEZONE=${TIMEZONE} # Performance Settings - NODE_OPTIONS=--max-old-space-size=2048 - N8N_DEFAULT_BINARY_DATA_MODE=filesystem - EXECUTIONS_DATA_PRUNE=true - EXECUTIONS_DATA_MAX_AGE=336 - EXECUTIONS_DATA_PRUNE_MAX_COUNT=50000 # Monitoring - N8N_METRICS=true volumes: - n8n_prod_data:/home/node/.n8n networks: - frontend - backend-prod depends_on: postgres-prod: condition: service_healthy healthcheck: test: ["CMD", "wget", "--spider", "-q", "http://localhost:5678/healthz"] interval: 30s timeout: 10s retries: 3 start_period: 60s # ============================================ # DEVELOPMENT INSTANCE # ============================================ postgres-dev: image: postgres:16-alpine container_name: n8n-postgres-dev restart: unless-stopped environment: - POSTGRES_USER=${POSTGRES_DEV_USER} - POSTGRES_PASSWORD=${POSTGRES_DEV_PASSWORD} - POSTGRES_DB=${POSTGRES_DEV_DB} volumes: - postgres_dev_data:/var/lib/postgresql/data networks: - backend-dev healthcheck: test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_DEV_USER} -d ${POSTGRES_DEV_DB}"] interval: 10s timeout: 5s retries: 5 start_period: 30s n8n-dev: image: docker.n8n.io/n8nio/n8n:latest container_name: n8n-dev restart: unless-stopped environment: # Database Configuration - DB_TYPE=postgresdb - DB_POSTGRESDB_HOST=postgres-dev - DB_POSTGRESDB_PORT=5432 - DB_POSTGRESDB_DATABASE=${POSTGRES_DEV_DB} - DB_POSTGRESDB_USER=${POSTGRES_DEV_USER} - DB_POSTGRESDB_PASSWORD=${POSTGRES_DEV_PASSWORD} # n8n Configuration - N8N_HOST=${N8N_DEV_HOST} - N8N_PORT=5678 - N8N_PROTOCOL=https - WEBHOOK_URL=https://${N8N_DEV_HOST}/ - N8N_ENCRYPTION_KEY=${N8N_DEV_ENCRYPTION_KEY} - GENERIC_TIMEZONE=${TIMEZONE} # Performance Settings (lower limits for dev) - NODE_OPTIONS=--max-old-space-size=1024 - N8N_DEFAULT_BINARY_DATA_MODE=filesystem - EXECUTIONS_DATA_PRUNE=true - EXECUTIONS_DATA_MAX_AGE=72 - EXECUTIONS_DATA_PRUNE_MAX_COUNT=5000 # Monitoring - N8N_METRICS=true volumes: - n8n_dev_data:/home/node/.n8n networks: - frontend - backend-dev depends_on: postgres-dev: condition: service_healthy healthcheck: test: ["CMD", "wget", "--spider", "-q", "http://localhost:5678/healthz"] interval: 30s timeout: 10s retries: 3 start_period: 60s # ============================================ # CLOUDFLARE TUNNEL (for n8n access) # ============================================ cloudflared: image: cloudflare/cloudflared:latest container_name: n8n-cloudflared restart: unless-stopped command: tunnel --no-autoupdate run --token ${TUNNEL_TOKEN} networks: - frontend depends_on: - n8n-prod - n8n-dev # ============================================ # NETWORKS # ============================================ networks: frontend: driver: bridge backend-prod: driver: bridge internal: true backend-dev: driver: bridge internal: true # ============================================ # VOLUMES # ============================================ volumes: postgres_prod_data: postgres_dev_data: n8n_prod_data: n8n_dev_data:
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Save and exit (Ctrl+O, Enter, Ctrl+X).
7.1 Configuration Differences: Prod vs Dev
Setting
Production
Development
Reason
max-old-space-size
2048 MB
1024 MB
Dev needs less memory
EXECUTIONS_DATA_MAX_AGE
336 hrs (14 days)
72 hrs (3 days)
Less retention for dev
EXECUTIONS_DATA_PRUNE_MAX_COUNT
50,000
5,000
Lower limits for dev
8. Configure Public Hostnames
Do this in your web browser (on CLIENT)
After the containers are running, configure the tunnel routing:
Go to Cloudflare Zero Trust Dashboard
Navigate to Networks → Tunnels
Click on your n8n-stack tunnel
Go to Public Hostname tab
Click Add a public hostname
Production Hostname
Field
Value
Subdomain
n8n-prod
Domain
Select your domain
Path
(leave empty)
Type
HTTP
URL
n8n-prod:5678
Click Save hostname .
Development Hostname
Click Add a public hostname again:
Field
Value
Subdomain
n8n-dev
Domain
Select your domain
Path
(leave empty)
Type
HTTP
URL
n8n-dev:5678
Click Save hostname .
Understanding Service URLs
URL
Correct?
Explanation
n8n-prod:5678
✅
Docker DNS resolves container names
localhost:5678
❌
Points to cloudflared container itself
192.168.x.x:5678
⚠️
Works but IP may change
9. Securing the Development Instance
Do this in your web browser (on CLIENT)
Protect the dev instance with Cloudflare Access so only you can access it.
9.1 Create Access Application
Go to Access → Applications
Click Add an application
Select Self-hosted
Configure:
Field
Value
Application name
n8n Development
Session duration
24 hours
Application domain
n8n-dev.yourdomain.com
Path
(leave empty)
Click Next
9.2 Create Access Policy
Field
Value
Policy name
Dev Access
Action
Allow
Include rule:
Click Next , then Add application .
9.3 Configure Webhook Bypass
Webhooks need to receive external requests without authentication. Since Cloudflare Access doesn’t support path-based rules within a policy, you must create a separate application for webhooks.
Create a Separate Webhook Application
Go to Access → Applications
Click Add an application
Select Self-hosted
Configure:
Field
Value
Application name
n8n Dev Webhooks
Session duration
24 hours
Application domain
n8n-dev.yourdomain.com
Path
webhook/*
Note: The Path field appears below the domain field when creating the application.
Click Next
Add Bypass Policy
Field
Value
Policy name
Bypass All
Action
Bypass
Include rule:
Selector: Everyone
Value: Everyone
Click Next → Add application
How It Works
You now have two applications for dev:
Application
Domain/Path
Policy
n8n Development
n8n-dev.yourdomain.com
Allow (your email)
n8n Dev Webhooks
n8n-dev.yourdomain.com/webhook/*
Bypass (Everyone)
Cloudflare evaluates the most specific path first , so:
Requests to /webhook/* → Bypass (no auth required)
All other requests → Require authentication
Note for Production: If your production instance (n8n-prod.yourdomain.com) is public without Access protection, webhooks work automatically — no bypass application needed.
10. Deployment
Run these commands on SERVER (via SSH)
ssh myserver cd ~/n8n-stack
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10.1 Validate Configuration
# Check .env file permissions ls -la .env # Validate docker-compose syntax docker compose config --quiet && echo "✓ Configuration valid"
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10.2 Start Services
docker compose up -d
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10.3 Monitor Startup
# Watch all logs (Ctrl+C to exit) docker compose logs -f # Or watch specific service docker compose logs -f n8n-prod
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10.4 Verify All Containers Running
docker compose ps
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Expected output:
NAME STATUS PORTS n8n-cloudflared Up X minutes n8n-dev Up X minutes (healthy) n8n-postgres-dev Up X minutes (healthy) n8n-postgres-prod Up X minutes (healthy) n8n-prod Up X minutes (healthy)
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Wait until all show (healthy) status (1-2 minutes).
11. First-Time n8n Setup
Do this in your web browser (on CLIENT)
11.1 Production Instance
Open https://n8n-prod.yourdomain.com
Create your owner account:
Email
First name, Last name
Strong password
Complete the setup wizard
11.2 Development Instance
Open https://n8n-dev.yourdomain.com
Authenticate with Cloudflare Access (if configured)
Create a separate owner account
⚠️ Security: The first user to access each instance becomes the owner. Complete this immediately after deployment.
12. Verification and Testing
Run on SERVER (via SSH) unless noted
12.1 Test Container Health
# Test n8n health endpoints docker exec n8n-prod wget -qO- http://localhost:5678/healthz docker exec n8n-dev wget -qO- http://localhost:5678/healthz
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12.2 Test Tunnel Connectivity
# Check cloudflared can reach n8n containers docker exec n8n-cloudflared wget -qO- --timeout=5 http://n8n-prod:5678/healthz docker exec n8n-cloudflared wget -qO- --timeout=5 http://n8n-dev:5678/healthz
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12.3 Test Database Connectivity
# Check PostgreSQL docker exec n8n-postgres-prod pg_isready -U n8n_prod -d n8n_production docker exec n8n-postgres-dev pg_isready -U n8n_dev -d n8n_development
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12.4 Test Webhooks
Do this from CLIENT
In n8n-prod, create a workflow with a Webhook node
Set method to POST
Copy the Production URL
Activate the workflow
Test from your client terminal:
curl -X POST https://n8n-prod.yourdomain.com/webhook-test/your-webhook-path \ -H "Content-Type: application/json" \ -d '{"test": "Hello from webhook!"}'
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13. Backup Procedures
Run on SERVER (via SSH)
13.1 Manual Backup
cd ~/n8n-stack # Production database docker exec n8n-postgres-prod pg_dump -U n8n_prod -d n8n_production | gzip > backup_prod_$(date +%Y%m%d).sql.gz # Development database docker exec n8n-postgres-dev pg_dump -U n8n_dev -d n8n_development | gzip > backup_dev_$(date +%Y%m%d).sql.gz # Environment file (CRITICAL - contains encryption keys) cp .env .env.backup.$(date +%Y%m%d)
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13.2 Automated Backup Script
cat > backup.sh << 'EOF' #!/bin/bash set -e BACKUP_DIR="$HOME/n8n-backups" DATE=$(date +%Y%m%d_%H%M%S) RETENTION_DAYS=14 mkdir -p "$BACKUP_DIR" echo "[$(date)] Starting backup..." # Production docker exec n8n-postgres-prod pg_dump -U n8n_prod -F c -d n8n_production > "$BACKUP_DIR/prod_$DATE.dump" # Development docker exec n8n-postgres-dev pg_dump -U n8n_dev -F c -d n8n_development > "$BACKUP_DIR/dev_$DATE.dump" # Environment file cp ~/n8n-stack/.env "$BACKUP_DIR/env_$DATE.backup" # Cleanup old backups find "$BACKUP_DIR" -name "*.dump" -mtime +$RETENTION_DAYS -delete find "$BACKUP_DIR" -name "*.backup" -mtime +$RETENTION_DAYS -delete echo "[$(date)] Backup complete!" ls -lh "$BACKUP_DIR" | tail -5 EOF chmod +x backup.sh
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13.3 Schedule Daily Backups
crontab -e
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Add:
0 2 * * * /home/$USER/n8n-stack/backup.sh >> /home/$USER/n8n-stack/backup.log 2>&1
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13.4 Restore from Backup
# Stop n8n first docker compose stop n8n-prod # Restore production database gunzip -c backup_prod_20260122.sql.gz | docker exec -i n8n-postgres-prod psql -U n8n_prod -d n8n_production # Start n8n docker compose start n8n-prod
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14. Troubleshooting
Common Issues
Issue
Cause
Solution
502 Bad Gateway
Container not healthy
docker compose logs n8n-prod – wait for healthy
Webhooks show localhost
WEBHOOK_URL wrong
Check .env has correct public URL
“Connection refused”
Database not ready
Wait for postgres to be healthy
Can’t access dev instance
Not in Access policy
Add your email to Cloudflare Access
Tunnel not connecting
Wrong token
Verify TUNNEL_TOKEN in .env
Useful Commands
# Check all container status docker compose ps # View logs docker compose logs -f cloudflared docker compose logs -f n8n-prod # Restart a service docker compose restart n8n-prod # Rebuild everything docker compose down docker compose up -d # Check resource usage docker stats # Access container shell docker exec -it n8n-prod /bin/sh
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Network Debugging
# Test DNS resolution inside cloudflared docker exec n8n-cloudflared nslookup n8n-prod docker exec n8n-cloudflared nslookup n8n-dev # Check network configuration docker network ls docker network inspect n8n-stack_frontend
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15. Quick Reference
Your Endpoints
Service
URL
SSH Access
ssh myserver
n8n Production
https://n8n-prod.yourdomain.com
n8n Development
https://n8n-dev.yourdomain.com
Daily Operations (from CLIENT)
# Connect to server ssh myserver # Check status cd ~/n8n-stack && docker compose ps # View logs docker compose logs -f # Restart services docker compose restart # Update n8n docker compose pull docker compose up -d
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File Locations (on SERVER)
File
Path
Docker Compose
~/n8n-stack/docker-compose.yml
Environment
~/n8n-stack/.env
Backups
~/n8n-backups/
SSH Tunnel
~/cloudflare-tunnel/
Important Reminders
✅ Backup encryption keys – Store .env securely offline
✅ Don’t change encryption keys after first run
✅ Create owner accounts immediately after deployment
✅ Test webhooks before using in production
✅ Keep SSH tunnel separate from n8n tunnel
Appendix A: Docker Installation
If Docker is not installed on your server:
# Remove old versions for pkg in docker.io docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove -y $pkg 2>/dev/null done # Add Docker repository sudo apt-get update sudo apt-get install -y ca-certificates curl sudo install -m 0755 -d /etc/apt/keyrings sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc sudo chmod a+r /etc/apt/keyrings/docker.asc echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt-get update # Install Docker sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin # Add user to docker group sudo usermod -aG docker $USER newgrp docker # Enable on boot sudo systemctl enable docker.service sudo systemctl enable containerd.service # Verify docker run hello-world
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