docker-compose.yml → pronounced “yamel”

• • 1. yml is similar to JSON but indentations instead of brackets. No commas
    2. “Extends” keyword
       1. Enables sharing of common configurations amongst diff files & projects
       2. Useful if several different files which use common set of configurations

Example of using “extends” in yaml files

Common.yml

version: '2'

services:

dockerapp:

ports:

• "5000:5000"

redis:

image: redis:3.2.0

docker-compose.yml

version: '2'

services:

dockerapp:

extends:

file: common.yml

service: dockerapp //use common.yml dockerapp code

build: . //dockerapp’s Dockerfile in cwd

redis:

extends:

file: common.yml //use common.yml redis code

service: redis

Example docker-compose files

Example 0: github.com/jleetutorial/dockerapp

------------- version: '2'

Services: //either “build” image with Dockerfile or from image

dockerapp: //local-image-name → (local-image-name_repository_name)

build: .

ports:

• "5000:5000" external host(OsX):internal container

volumes:

• ./app:/app //host:container (ie OsX:container)

//no longer need COPY command in Dockerfile

redis:

image: redis:3.2.0 //naming image

Example 1: github.com/DanWahlin/NodeExpressMongoDBDockerApp

version: '2' // ‘2’ supports volumes & networks (v1 does NOT)

services:

Node:

container_name: ex1Name

build:

context: . // “.” - look in curr dir(of .yml) for dockerfile

dockerfile: node.dockerfile

ports:

• "3000:3000" //leading “-” b/c can have multiple

networks:

• node-app-network //leading “-” b/c can have multiple

mongodb:

image: mongo

networks:

• node-app-network //leading “-” b/c can have multiple

networks:

node-app-network:

driver: bridge

Example 2: github.com/DanWahlin/CodeWithDanDockerServices/blob/master/docker-compose.yml

1. Update config values (localhost --> mongo and localhost --> redis) in config.development.json

2. Set APP_ENV environment variable to proper value in Dockerfile-redis (default is "development")

export APP_ENV=development

export DOCKER_ACCT=<yourHubUserName>

3. Run docker-compose build

4. Run docker-compose up

5. Live long and prosper

version: "2"

services:

nginx: //reverse proxy server. Balance loads node1,2 & 3

container_name: nginx // name container. OK: “-” & CAPS. NO: “ “ & /

image: ${DOCKER_ACCT}/nginx

build:

context: .

dockerfile: .docker/nginx.${APP_ENV}.dockerfile

links:

• node1:node1 //links: important here since feeds 3 servers

• node2:node2

• node3:node3

ports:

• "80:80"

• "443:443"

Env_file:

• ./.docker/env/app.${APP_ENV}.env

networks:

• codewithdan-network

node1:

container_name: node-codewithdan-1

image: ${DOCKER_ACCT}/node-codewithdan

build:

context: .

dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile

ports:

• "8080"

volumes:

• .:/var/www/codewithdan

working_dir: /var/www/codewithdan

env_file:

• ./.docker/env/app.${APP_ENV}.env

networks:

• codewithdan-network

node2:

container_name: node-codewithdan-2

image: ${DOCKER_ACCT}/node-codewithdan

build:

context: .

dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile

ports:

• "8080"

volumes:

• .:/var/www/codewithdan

working_dir: /var/www/codewithdan

env_file:

• ./.docker/env/app.${APP_ENV}.env

networks:

• codewithdan-network

node3:

container_name: node-codewithdan-3

image: ${DOCKER_ACCT}/node-codewithdan

build:

context: .

dockerfile: .docker/node-codewithdan.${APP_ENV}.dockerfile

ports:

• "8080"

volumes:

• .:/var/www/codewithdan

working_dir: /var/www/codewithdan

env_file:

• ./.docker/env/app.${APP_ENV}.env

networks:

• codewithdan-network

mongo:

container_name: mongo

image: ${DOCKER_ACCT}/mongo

build:

context: .

dockerfile: .docker/mongo.dockerfile

ports:

• "27017:27017"

env_file:

• ./.docker/env/mongo.${APP_ENV}.env

networks:

• codewithdan-network

redis:

container_name: redis

image: ${DOCKER_ACCT}/redis

build:

context: .

dockerfile: .docker/redis.${APP_ENV}.dockerfile

ports:

• "6379"

networks:

• codewithdan-network

networks:

codewithdan-network:

driver: bridge