How to run multiple applications with single mongodb using docker

Question

I want to be able to run two separate apps in two containers - one for each independent app. Then both apps should be able to communicate with the 3rd container which will hold MongoDB.

Folder structure on my local machine

/Users/me/Dev: Dockerfile, docker-compose.yml 
/Users/me/Dev/App1: with source code and package.json for app1
/Users/me/Dev/App2: with source code and package.json for app2
/Users/me/Dev/data/db: I wanna keep datafile for Mongo

dockerfile - but honestly it does not look right too me to repeat twice for both apps. (Its a first time I am using docker so am not yet familiar with how to best prepare the Dockerfile for my scenario)

FROM node:8.9.1
WORKDIR ./app1/
COPY ./package.json ./app1/
RUN npm install
CMD npm start
COPY ./app1/ ./app1/
EXPOSE 8081
#
FROM node:8.9.1
WORKDIR ./app2/
COPY ./package.json ./app2/
RUN npm install
CMD npm start
COPY ./app2/ ./app2/
EXPOSE 8082

docker-compose.yml

version: '2'

services:
app1:
build: .
volumes:
  - .:/app1
ports:
  - "8082:8082"
links:
  - mongo
depends_on:
  - mongo

# app2:
#   build: .
#   volumes:
#     - .:./app2
#   ports:
#     - "8081:8081"
#   links:
#     - mongo
#   depends_on:
#     - mongo

mongo:
image: mongo:3.4.10
volumes:
    - './dev/data/db:/data/db'
ports:
    - "27017:27017"

Few issues: On docker-compose build for example I got - ERROR: Service 'app1' failed to build: COPY failed: stat /var/lib/docker/tmp/docker-builder287108072/package.json: no such file or directory

Even if I tried multiple ways of providing the path in Dockerfile and d-compose I still am not convinced this is gonna work.

So I need some guidance on how to prepare Dockerfile and docker compose in my main DEV folder (as described above) so that docker will start up 3 containers (app1, app2, mongo) all on the same docker network to communicate with each other.

create the docker images first. Then write the docker-compose.yml file for running the app. Instead of buiding. Its good practice. — Jinna Baalu
– Jinna Baalu, Commented Feb 18, 2018 at 20:21

Jinna Baalu · Accepted Answer · 2018-02-18 20:46:05Z

2

Approach#1 Just correct your Dockerfile

Path need to be replaced with the folder path first

correct it with

COPY ./App1/package.json ./app1/

COPY ./App2/package.json ./app2/

But this look wrong practice. Folow bellow steps to create the docker images and deploy them with the docker-compose.yml just like mongo image you have to create your own image and run them with compose.

Approach#2 Good practice to deploy apps

App1 Docker Image

Goto your App1 folder and create a Dockerfile

Dockerfile

FROM node:8.9.1
WORKDIR ./app1/
COPY ./package.json ./app1/
RUN npm install
CMD npm start
COPY ./app1/ ./app1/
EXPOSE 8081

Create docker images with

docker build -t app1Image .

App2 Docker Image

Goto your App2 folder and create a Dockerfile

Dockerfile

FROM node:8.9.1
WORKDIR ./app2/
COPY ./package.json ./app2/
RUN npm install
CMD npm start
COPY ./app2/ ./app2/
EXPOSE 8081

Create docker images with

docker build -t app1Image .

Deploy Image with compose

Create docker-compose.yml in Dev folder

docker-compose.yml

version: '2'
services:
   app1:
     image: app1Image
     ports:
       - 8082:8082
     links:
       - mongo
     depends_on:
       - mongo
   app2:
     image: app2Image
     ports:
       - 8081:8081
     links:
       - mongo
     depends_on:
       - mongo
   mongo:
     image: mongo:3.4.10
     ports:
       - 27017:27017
     volumes:
       - './dev/data/db:/data/db'
     links:
       - mongo
     depends_on:
       - mongo

RUN App with docker-compose

docker-compose up -d

answered Feb 18, 2018 at 20:46

Jinna Baalu

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2 Comments

jd2012 Over a year ago

Thanks so much. It worked with images. I will keep the build version, slightly adjusted after your answer, for my day to day development when I want change reflected live when I make edits to js files. Again thanks so much for the answer.

Jinna Baalu Over a year ago

You don't need to change the build versio. use latest always. Kepp backup of each image by tagging. mark it as answer if it solves your purpose

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How to run multiple applications with single mongodb using docker

1 Answer 1

Approach#1 Just correct your Dockerfile

Approach#2 Good practice to deploy apps

App1 Docker Image

App2 Docker Image

Deploy Image with compose

2 Comments

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Collectives™ on Stack Overflow

1 Answer 1

Approach#1 Just correct your Dockerfile

Approach#2 Good practice to deploy apps

App1 Docker Image

App2 Docker Image

Deploy Image with compose

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