frappe_docker/docs/02-setup/04-env-variables.md

Environment Variables Reference

Environment variables configure your Frappe Docker setup. They can be set directly in the container or defined in a .env file referenced by Docker Compose.

Getting Started:

cp example.env .env

Then edit .env and set variables according to your needs.

---

Required Variables

Variable	Purpose	Example	Notes
FRAPPE_PATH	Frappe framework path	https://github.com/frappe/frappe
FRAPPE_BRANCH	Frappe Branch	version-15	See Frappe releases
ERPNEXT_VERSION	ERPNext release version	v15.67.0	Required although its never used
DB_PASSWORD	Password for database root (MariaDB or Postgres)	secure_password_123	Not needed if using DB_PASSWORD_SECRETS_FILE

---

Database Configuration

Variable	Purpose	Default	When to Set
DB_PASSWORD	Database root user password	123	Always (unless using secrets file)
DB_PASSWORD_SECRETS_FILE	Path to file containing database password	—	Setup mariadb-secrets overrider
DB_HOST	Database hostname or IP	db (service name)	Only if using external database
DB_PORT	Database port	3306 (MariaDB) / 5432 (Postgres)	Only if using external database

---

Redis Configuration

Variable	Purpose	Default	When to Set
REDIS_CACHE	Redis hostname for caching	redis-cache (service name)	Only if using external Redis instance
REDIS_QUEUE	Redis hostname for job queues and real-time updates	redis-queue (service name)	Only if using external Redis instance

---

Reverse Proxy and SSL (HTTPS) Configuration

Traefik (compose.proxy.yaml / compose.https.yaml)

Variable	Purpose	Default	When to Set
LETSENCRYPT_EMAIL	Email for Let's Encrypt certificate registration	-	Required for compose.https.yaml
SITES_RULE	Domains for routing (Traefik rule expression)	-	Required for Traefik routing/HTTPS overrides

Format for SITES_RULE:

# Single site
SITES_RULE=Host(`mysite.example.com`)

# Multiple sites
SITES_RULE=Host(`a.example.com`) || Host(`b.example.com`)

Note: The Traefik v3 migration is complete. Use SITES_RULE as a full v3 rule expression; SITES is deprecated. Rule syntax now defaults to v3, so no core.defaultRuleSyntax or per-router ruleSyntax settings are required.

nginx-proxy + acme-companion (compose.nginxproxy*.yaml)

Variable	Purpose	Default	When to Set
LETSENCRYPT_EMAIL	Email for Let's Encrypt certificate	-	Required for compose.nginxproxy-ssl.yaml
NGINX_PROXY_HOSTS	Comma-separated hostnames for nginx-proxy	-	Required for compose.nginxproxy*.yaml

Example:

NGINX_PROXY_HOSTS=example.com,www.example.com

Note: Automatic certificates require port 80 to be reachable (HTTP-01).

Published Ports (Traefik and nginx-proxy)

Variable	Purpose	Default	When to Set
HTTP_PUBLISH_PORT	Published HTTP port	80 (proxy) / 8080 (noproxy)	Change if port is in use
HTTPS_PUBLISH_PORT	Published HTTPS port	443	Change if port 443 is in use

---

Site Configuration

Variable	Purpose	Default	When to Set
FRAPPE_SITE_NAME_HEADER	Site name for multi-tenant setup	$host (resolved from request hostname)	When accessing by IP or need explicit site name

Examples:

If your site is named mysite but you want to access it via 127.0.0.1:

FRAPPE_SITE_NAME_HEADER=mysite

If your site is named example.com and you access it via that domain, no need to set this (defaults to hostname).

---

Image Configuration

Variable	Purpose	Default	Notes
CUSTOM_IMAGE	Custom Docker image repository	Frappe official image	Leave empty to use default
CUSTOM_TAG	Custom Docker image tag	Latest stable	Corresponds to FRAPPE_VERSION
PULL_POLICY	Image pull behavior	always	Options: always, never, if-not-present
RESTART_POLICY	Container restart behavior	unless-stopped	Options: no, always, unless-stopped, on-failure

---

Frontend Nginx Configuration (inside the frontend container)

Variable	Purpose	Default	Allowed Values
BACKEND	Backend service address and port	0.0.0.0:8000	{host}:{port}
SOCKETIO	Socket.IO service address and port	0.0.0.0:9000	{host}:{port}
PROXY_READ_TIMEOUT	Upstream request timeout	120s	Any nginx timeout value (e.g., 300s, 5m)
CLIENT_MAX_BODY_SIZE	Maximum upload file size	50m	Any nginx size value (e.g., 100m, 1g)

Real IP Configuration (Behind Proxy)

Use these variables when running behind a reverse proxy or load balancer:

Variable	Purpose	Default
UPSTREAM_REAL_IP_ADDRESS	Trusted upstream IP address for real IP detection	127.0.0.1
UPSTREAM_REAL_IP_HEADER	Request header containing client IP	X-Forwarded-For
UPSTREAM_REAL_IP_RECURSIVE	Enable recursive IP search	off