graphql and serverless offline running in docker - docker

Question

I have this docker file:
FROM node:6-slim
RUN apt-get update \
&& apt-get install -y python2.7 make g++ git bzip2 libfreetype6 libfontconfig1 \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
&& ln -s /usr/bin/python2.7 /usr/bin/python
RUN cd $(npm root -g)/npm \
&& npm install serverless -g\
&& npm install fs-extra \
&& sed -i -e s/graceful-fs/fs-extra/ -e s/fs\.move/fs.rename/ ./lib/utils/rename.js
ADD package.json /tmp/package.json
CMD [REV=$(git rev-list -n 1 HEAD 'package.json');]
CMD [STAMP=$(git show --pretty=format:%ai --abbrev-commit "$REV" | head -n 1);]
CMD [touch -d "$STAMP" package.json;]
RUN cd /tmp && npm install --quiet --production \
&& npm rebuild bcrypt \
&& rm -Rf node_modules/ffprobe-static/bin/darwin \
&& rm -Rf node_modules/ffprobe-static/bin/win32
RUN mkdir -p /usr/src/app && cp -a /tmp/node_modules /usr/src/app
WORKDIR /usr/src/app
ADD . /usr/src/app
RUN cd /usr/src/app \
&& git gc --aggressive --prune=all
ENV PORT 9999
EXPOSE 9999
CMD [ "npm", "run", "offline" ]
When I run it, all works without problems, but when I try to access the docker instance:
docker inspect --format '{{ .NetworkSettings.IPAddress }}' serverless
172.17.0.3
When I go to 172.17.0.3:9999 I am not able to connect to the instance.
Whereas if I run my application from my local machine, localhost:9999 responds.
Here is a copy of my serverless.yml:
service: serverless-graphql
plugins:
- serverless-offline
provider:
name: aws
runtime: nodejs4.3
timeout: 30
stage: dev
# you can add statements to the Lambda function's IAM Role here
iamRoleStatements:
- Effect: Allow
Action:
- dynamodb:*
Resource: "*"
- Effect: Allow
Action:
- s3:*
Resource: "*"
# you can define service wide environment variables here
environment:
database: mongo
MONGO_URI: "mongodb://docker-mongo:27017/test-db"
functions:
graphql:
handler: lib/handler.graphql
timeout: 12
events:
- http:
path: graphql
method: post
cors: true
stripewebhook:
handler: lib/handler.stripewebhook
events:
- http:
path: stripewebhook
method: post
cors: true
Any advice is much appreciated.