how to setup multiple fastapi instances -micro services · fastapi/full-stack-fastapi-template · Discussion #1840

sivajik34
Sep 5, 2025

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Example Code

services:
 # --------------------
 # Databases
 # --------------------
 user-db:
 image: postgres:17
 restart: always
 env_file: .env
 environment:
 POSTGRES_USER: ${USER_DB_USER}
 POSTGRES_PASSWORD: ${USER_DB_PASSWORD}
 POSTGRES_DB: ${USER_DB}
 volumes:
 - user-db-data:/var/lib/postgresql/data
 healthcheck:
 test: ["CMD-SHELL", "pg_isready -U ${USER_DB_USER} -d ${USER_DB}"]
 interval: 10s
 timeout: 5s
 retries: 5
 product-db:
 image: postgres:17
 restart: always
 env_file: .env
 environment:
 POSTGRES_USER: ${PRODUCT_DB_USER}
 POSTGRES_PASSWORD: ${PRODUCT_DB_PASSWORD}
 POSTGRES_DB: ${PRODUCT_DB}
 volumes:
 - product-db-data:/var/lib/postgresql/data
 healthcheck:
 test: ["CMD-SHELL", "pg_isready -U ${PRODUCT_DB_USER} -d ${PRODUCT_DB}"]
 interval: 10s
 timeout: 5s
 retries: 5
 order-db:
 image: postgres:17
 restart: always
 env_file: .env
 environment:
 POSTGRES_USER: ${ORDER_DB_USER}
 POSTGRES_PASSWORD: ${ORDER_DB_PASSWORD}
 POSTGRES_DB: ${ORDER_DB}
 volumes:
 - order-db-data:/var/lib/postgresql/data
 healthcheck:
 test: ["CMD-SHELL", "pg_isready -U ${ORDER_DB_USER} -d ${ORDER_DB}"]
 interval: 10s
 timeout: 5s
 retries: 5
 # --------------------
 # Prestart Jobs
 # --------------------
 prestart-user:
 image: '${DOCKER_IMAGE_USER_SERVICE?Variable not set}:${TAG-latest}'
 build:
 context: ./services/user-service
 networks:
 - traefik-public
 - default
 depends_on:
 user-db:
 condition: service_healthy
 command: bash scripts/prestart.sh
 env_file:
 - .env
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${USER_DB_SERVER}
 - POSTGRES_USER=${USER_DB_USER}
 - POSTGRES_PASSWORD=${USER_DB_PASSWORD}
 - POSTGRES_DB=${USER_DB}
 - DATABASE_URL=postgresql://${USER_DB_USER}:${USER_DB_PASSWORD}@${USER_DB_SERVER}:5432/${USER_DB}
 - SENTRY_DSN=${SENTRY_DSN}
 prestart-product:
 image: '${DOCKER_IMAGE_PRODUCT_SERVICE?Variable not set}:${TAG-latest}'
 build:
 context: ./services/product-service
 
 networks:
 - traefik-public
 - default
 depends_on:
 product-db:
 condition: service_healthy
 command: bash scripts/prestart.sh
 env_file:
 - .env
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${PRODUCT_DB_SERVER}
 - POSTGRES_USER=${PRODUCT_DB_USER}
 - POSTGRES_PASSWORD=${PRODUCT_DB_PASSWORD}
 - POSTGRES_DB=${PRODUCT_DB}
 - DATABASE_URL=postgresql://${PRODUCT_DB_USER}:${PRODUCT_DB_PASSWORD}@${PRODUCT_DB_SERVER}:5432/${PRODUCT_DB}
 - SENTRY_DSN=${SENTRY_DSN}
 prestart-order:
 image: '${DOCKER_IMAGE_ORDER_SERVICE?Variable not set}:${TAG-latest}'
 build:
 context: ./services/order-service
 networks:
 - traefik-public
 - default
 depends_on:
 order-db:
 condition: service_healthy
 command: bash scripts/prestart.sh
 env_file:
 - .env
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${ORDER_DB_SERVER}
 - POSTGRES_USER=${ORDER_DB_USER}
 - POSTGRES_PASSWORD=${ORDER_DB_PASSWORD}
 - POSTGRES_DB=${ORDER_DB}
 - DATABASE_URL=postgresql://${ORDER_DB_USER}:${ORDER_DB_PASSWORD}@${ORDER_DB_SERVER}:5432/${ORDER_DB}
 - SENTRY_DSN=${SENTRY_DSN} 
 # --------------------
 # Microservices
 # --------------------
 user-service:
 build: ./services/user-service
 restart: always
 networks:
 - traefik-public
 - default
 depends_on:
 user-db:
 condition: service_healthy
 restart: true
 prestart-user:
 condition: service_completed_successfully
 env_file:
 - .env
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:8001/users/utils/health-check/"]
 interval: 10s
 timeout: 5s
 retries: 5 
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${USER_DB_SERVER}
 - POSTGRES_USER=${USER_DB_USER}
 - POSTGRES_PASSWORD=${USER_DB_PASSWORD}
 - POSTGRES_DB=${USER_DB}
 - DATABASE_URL=postgresql://${USER_DB_USER}:${USER_DB_PASSWORD}@${USER_DB_SERVER}:5432/${USER_DB}
 - SENTRY_DSN=${SENTRY_DSN}
 - DATABASE_URL=postgresql://user_admin:user_pass@user-db:5432/user_db
 labels:
 - traefik.enable=true
 - traefik.docker.network=traefik-public
 - traefik.constraint-label=traefik-public
 # Service port
 - traefik.http.services.user-service.loadbalancer.server.port=8000
 # HTTP Router
 - traefik.http.routers.user-service-http.rule= PathPrefix('/users')
 - traefik.http.routers.user-service-http.entrypoints=http
 
 # HTTPS Router
 - traefik.http.routers.user-service-https.rule= PathPrefix('/users')
 - traefik.http.routers.user-service-https.entrypoints=https
 - traefik.http.routers.user-service-https.tls=true
 - traefik.http.routers.user-service-https.tls.certresolver=le
 - traefik.http.routers.user-service-http.middlewares=https-redirect
 product-service:
 build: ./services/product-service
 restart: always
 networks:
 - traefik-public
 - default
 depends_on:
 product-db:
 condition: service_healthy
 restart: true
 prestart-product:
 condition: service_completed_successfully
 env_file:
 - .env
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:8002/products/utils/health-check/"]
 interval: 10s
 timeout: 5s
 retries: 5
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${PRODUCT_DB_SERVER}
 - POSTGRES_USER=${PRODUCT_DB_USER}
 - POSTGRES_PASSWORD=${PRODUCT_DB_PASSWORD}
 - POSTGRES_DB=${PRODUCT_DB}
 - DATABASE_URL=postgresql://${PRODUCT_DB_USER}:${PRODUCT_DB_PASSWORD}@${PRODUCT_DB_SERVER}:5432/${PRODUCT_DB}
 - SENTRY_DSN=${SENTRY_DSN}
 - DATABASE_URL=postgresql://product_admin:product_pass@product-db:5432/product_db
 labels:
 - traefik.enable=true
 - traefik.docker.network=traefik-public
 - traefik.constraint-label=traefik-public
 # Service port
 - traefik.http.services.product-service.loadbalancer.server.port=8000
 # HTTP Router
 - traefik.http.routers.product-service-http.rule= PathPrefix(`/products`)
 - traefik.http.routers.product-service-http.entrypoints=http
 - traefik.http.routers.product-service-http.middlewares=https-redirect
 # HTTPS Router
 - traefik.http.routers.product-service-https.rule=PathPrefix(`/products`)
 - traefik.http.routers.product-service-https.entrypoints=https
 - traefik.http.routers.product-service-https.tls=true
 - traefik.http.routers.product-service-https.tls.certresolver=le
 order-service:
 build: ./services/order-service
 restart: always
 networks:
 - traefik-public
 - default
 depends_on:
 order-db:
 condition: service_healthy
 restart: true
 prestart-order:
 condition: service_completed_successfully
 env_file:
 - .env
 healthcheck:
 test: ["CMD", "curl", "-f", "http://localhost:8003/orders/utils/health-check/"]
 interval: 10s
 timeout: 5s
 retries: 5
 environment:
 - DOMAIN=${DOMAIN}
 - FRONTEND_HOST=${FRONTEND_HOST?Variable not set}
 - ENVIRONMENT=${ENVIRONMENT}
 - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
 - SECRET_KEY=${SECRET_KEY?Variable not set}
 - FIRST_SUPERUSER=${FIRST_SUPERUSER?Variable not set}
 - FIRST_SUPERUSER_PASSWORD=${FIRST_SUPERUSER_PASSWORD?Variable not set}
 - SMTP_HOST=${SMTP_HOST}
 - SMTP_USER=${SMTP_USER}
 - SMTP_PASSWORD=${SMTP_PASSWORD}
 - EMAILS_FROM_EMAIL=${EMAILS_FROM_EMAIL}
 - POSTGRES_SERVER=${ORDER_DB_SERVER}
 - POSTGRES_USER=${ORDER_DB_USER}
 - POSTGRES_PASSWORD=${ORDER_DB_PASSWORD}
 - POSTGRES_DB=${ORDER_DB}
 - DATABASE_URL=postgresql://${ORDER_DB_USER}:${ORDER_DB_PASSWORD}@${ORDER_DB_SERVER}:5432/${ORDER_DB}
 - SENTRY_DSN=${SENTRY_DSN}
 - DATABASE_URL=postgresql://order_admin:order_pass@order-db:5432/order_db
 labels:
 - traefik.enable=true
 - traefik.docker.network=traefik-public
 - traefik.constraint-label=traefik-public
 # Service port
 - traefik.http.services.order-service.loadbalancer.server.port=8000
 # HTTP Router
 - traefik.http.routers.order-service-http.rule=PathPrefix(`/orders`)
 - traefik.http.routers.order-service-http.entrypoints=http
 - traefik.http.routers.order-service-http.middlewares=https-redirect
 # HTTPS Router
 - traefik.http.routers.order-service-https.rule= PathPrefix(`/orders`)
 - traefik.http.routers.order-service-https.entrypoints=https
 - traefik.http.routers.order-service-https.tls=true
 - traefik.http.routers.order-service-https.tls.certresolver=le
 
 adminer:
 image: adminer
 restart: always
 networks:
 - traefik-public
 - default
 depends_on:
 - user-db
 environment:
 - ADMINER_DESIGN=pepa-linha-dark
 labels:
 - traefik.enable=true
 - traefik.docker.network=traefik-public
 - traefik.constraint-label=traefik-public
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-http.rule=Host(`adminer.${DOMAIN?Variable not set}`)
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-http.entrypoints=http
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-http.middlewares=https-redirect
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-https.rule=Host(`adminer.${DOMAIN?Variable not set}`)
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-https.entrypoints=https
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-https.tls=true
 - traefik.http.routers.${STACK_NAME?Variable not set}-adminer-https.tls.certresolver=le
 - traefik.http.services.${STACK_NAME?Variable not set}-adminer.loadbalancer.server.port=8080 
 # --------------------
 # Frontend
 # --------------------
 frontend:
 build:
 context: ./frontend
 args:
 - VITE_API_URL=https://api.${DOMAIN}
 - NODE_ENV=production
 restart: always
 networks:
 - traefik-public
 - default
 labels:
 - traefik.enable=true
 - traefik.docker.network=traefik-public
 - traefik.constraint-label=traefik-public
 # Service port
 - traefik.http.services.frontend.loadbalancer.server.port=80
 # HTTP Router
 - traefik.http.routers.frontend-http.rule=Host(`dashboard.${DOMAIN}`)
 - traefik.http.routers.frontend-http.entrypoints=http
 - traefik.http.routers.frontend-http.middlewares=https-redirect
 # HTTPS Router
 - traefik.http.routers.frontend-https.rule=Host(`dashboard.${DOMAIN}`)
 - traefik.http.routers.frontend-https.entrypoints=https
 - traefik.http.routers.frontend-https.tls=true
 - traefik.http.routers.frontend-https.tls.certresolver=le
 
# --------------------
# Volumes & Networks
# --------------------
volumes:
 user-db-data:
 product-db-data:
 order-db-data:
 
networks:
 traefik-public:
 external: true

Description

https://github.com/sivajik34/FastCart
I'm trying to add micro services user_service order_service product_service and getting port issues.
below 3 are working
http://localhost:8001/users/docs#/
http://localhost:8002/products/docs#/
http://localhost:8003/orders/docs#/
but from frontend it is not working http://localhost:8000/users/users/me net::ERR_CONNECTION_REFUSED
it seems I'm not able to configure api gateway.
can you help me on this

Operating System

Windows

Operating System Details

windows

Python Version

python 3.12

Additional Context

No response

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how to setup multiple fastapi instances -micro services #1840

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sivajik34
Sep 5, 2025

First Check

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Example Code

Description

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Operating System Details

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Additional Context

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Uh oh!

Uh oh!

how to setup multiple fastapi instances -micro services #1840

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sivajik34 Sep 5, 2025

First Check

Commit to Help

Example Code

Description

Operating System

Operating System Details

Python Version

Additional Context

Replies: 0 comments

sivajik34
Sep 5, 2025