Bcrypt: invalid ELF header with Docker and Sails.J

Question

My Node Dockfile:

# Set the base image to ubuntu
FROM ubuntu

# Define working directory
ADD . /src
WORKDIR /src

# Install Node.js & other dependencies
RUN apt-get update && \
        apt-get -y install curl && \
        apt-get -y install sudo && \
        curl -sL https://deb.nodesource.com/setup_0.12 | sudo bash - && \
        apt-get -y install python build-essential nodejs

RUN npm install -g node-gyp && \
        node-gyp clean && \
        npm cache clean

RUN node -v

# Install nodemon
RUN npm install -g nodemon


ADD package.json /src/package.json
RUN cd /src && npm install


# Expose port
EXPOSE  8080

# Run app using nodemon
CMD npm install; nodemon /src/app.js

Here is my docker-compose.yml:

nginx:
    build: ./nginx
    links:
        - node1:node1
        - node2:node2
        - node3:node3
    ports:
        - "80:80"
redis:
    image: redis
    ports:
        - "6379"
node1:
    build: ./node
    links:
        - redis
    ports:
        - "8080"
node2:
    build: ./node
    links:
        - redis
    ports:
        - "8080"
node3:
    build: ./node
    links:
        - redis
    ports:
        - "8080"

docker-compose build runs successfully and Redis/Nginx setup correcly on docker-compose up but the node instances throw this error:

node2_1 | /src/node_modules/bcrypt/node_modules/bindings/bindings.js:83
node2_1 |         throw e
node2_1 |               ^
node2_1 | Error: /src/node_modules/bcrypt/build/Release/bcrypt_lib.node: invalid ELF header
node2_1 |     at Error (native)
node2_1 |     at Module.load (module.js:355:32)
node2_1 |     at Function.Module._load (module.js:310:12)
node2_1 |     at Module.require (module.js:365:17)
node2_1 |     at require (module.js:384:17)
node2_1 |     at bindings (/src/node_modules/bcrypt/node_modules/bindings/bindings.js:76:44)
node2_1 |     at Object.<anonymous> (/src/node_modules/bcrypt/bcrypt.js:3:35)
node2_1 |     at Module._compile (module.js:460:26)
node2_1 |     at Object.Module._extensions..js (module.js:478:10)
node2_1 |     at Module.load (module.js:355:32)
node2_1 |     at Function.Module._load (module.js:310:12)
node2_1 |     at Module.require (module.js:365:17)
node2_1 |     at require (module.js:384:17)
node2_1 |     at Object.<anonymous> (/src/api/models/User.js:10:14)
node2_1 |     at Module._compile (module.js:460:26)
node2_1 |     at Object.Module._extensions..js (module.js:478:10)
node2_1 | 19 Aug 20:21:11 - [nodemon] app crashed - waiting for file changes before starting...

I've searched all over and can't seem to find a solution that works. I've tried using the regular setup url: https://deb.nodesource.com/setup, specifically installing python2.7, and using the ubuntu:15.04 image.

I've read that this happens when people try to use bcrypt on a linux env after it was built on a OS X (my OS), but I don't think that would be the issue since I'm building everything using docker and boot2docker.

Answer 1

Make sure that you are not copying the node_modules folder. I got this error when using the official nodejs "onbuild" image which would copy everything...

Now I use:

.dockerignore

node_modules

dockerfile

FROM node:6.4.0

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY package.json /usr/src/app/
RUN npm install
COPY . /usr/src/app

CMD [ "npm", "start" ]

EXPOSE 6969

Edit: The official NodeJS Docker starter image project on Github has accepted my pull request for ther README which instructs to explicitly ignore the node_modules.

Answer 2

In my package config I had "bcrypt":"^0.8.0" and when I took out the ^ and changed it to "bcrypt":"0.8.0" I was able to get everything running.

The issue was that it was trying to run bcrypt 0.8.5 and that was causing issues for some reason.

Answer 3

I was experiencing same thing, even though using Express, not Sails. I tried every suggestion here with no success. What made the trick was change the npm module bcrypt by bcrypt-nodejs:

npm uninstal bcrypt
npm install bcrypt-nodejs --save

Then change your require to something like

var bcrypt   = require('bcrypt-nodejs');

It is working flawlessly now.

Answer 4

just to add a new possible cause. I tried to build my docker image for a nodejs app but i've gotthe error invalid ELF header. In my case i ve resolved the issue by adding the node_modules/* from the .dockerignore file.