Convert Docker Run to Docker Compose

Moving from docker run commands to docker-compose.yml makes your deployments reproducible and easier to manage. Here is how to map common flags.

The Mapping Guide

Docker Run Flag	Compose Key	Example
-p 80:80	ports	- "80:80"
-v /host:/container	volumes	- /host:/container
-e KEY=VAL	environment	- KEY=VAL
--name my-app	container_name	container_name: my-app
--network my-net	networks	networks: [my-net]
--restart always	restart	restart: always
--link other	depends_on	- other

Example 1: Simple Web Server

Docker Run:

docker run -d -p 8080:80 --name web nginx:latest

Docker Compose:

services:
  web:
    image: nginx:latest
    container_name: web
    ports:
      - "8080:80"

Example 2: Database with Environment Variables

Docker Run:

docker run -d \
  --name db \
  -e POSTGRES_PASSWORD=secret \
  -v db-data:/var/lib/postgresql/data \
  postgres:15

Docker Compose:

services:
  db:
    image: postgres:15
    container_name: db
    environment:
      POSTGRES_PASSWORD: secret
    volumes:
      - db-data:/var/lib/postgresql/data

volumes:
  db-data:

Example 3: Linking Containers

Docker Run:

# Start DB
docker run -d --name db postgres
# Start App linked to DB
docker run -d -p 3000:3000 --link db:db my-app

Docker Compose:

services:
  db:
    image: postgres

  app:
    image: my-app
    ports:
      - "3000:3000"
    depends_on:
      - db
    # No need for 'links', they share a network by default

Tools to Automate

There are tools like Composerize that can automatically convert docker run commands to YAML. However, doing it manually ensures you understand the structure and can optimize it (e.g., by removing unnecessary container names or links).

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Stop pasting commands

Once you have your docker-compose.yml, deployment becomes a single click on Hostim.dev.

Deploy Compose File