Circleci 2.0 Build on Dockerfile - docker

Question

I have a Node.JS application that I'd like to build and test using CircleCI and Amazon ECR. The documentation is not clear on how to build an image from a Dockerfile in a repository. I've looked here: https://circleci.com/docs/2.0/building-docker-images/ and here https://circleci.com/blog/multi-stage-docker-builds/ but it's not clear what I put under the executor. Here's what I've got so far:
version: 2
jobs:
build:
docker:
steps:
- checkout
- setup_remote_docker:
version: 17.05.0-ce
# build the image
- run: docker build -t $ECR_REPO:0.1 .
CircleCI fails with the following error:
* The job has no executor type specified. The job should have one of the following keys specified: "machine", "docker", "macos"
The base image is take from the Dockerfile. I'm using CircleCI's built in AWS Integration so I don't think I need to add aws_auth. What do I need to put under the executor to get this running?

Answer 1

Build this with a Docker-in-Docker config:
version: 2
jobs:
build:
working_directory: /app
docker:
- image: docker:17.05.0-ce-git
steps:
- checkout
- setup_remote_docker
- run:
name: Install dependencies
command: |
apk add --no-cache \
py-pip=9.0.0-r1 gcc \
libffi-dev python-dev \
linux-headers \
musl-dev \
libressl-dev \
make
pip install \
docker-compose==1.12.0 \
awscli==1.11.76 \
ansible==2.4.2.0
- run:
name: Save Vault Password to File
command: echo $ANSIBLE_VAULT_PASS > .vault-pass.txt
- run:
name: Decrypt .env
command: |
ansible-vault decrypt .circleci/envs --vault-password-file .vault-pass.txt
- run:
name: Move .env
command: rm -f .env && mv .circleci/envs .env
- restore_cache:
keys:
- v1-{{ .Branch }}
paths:
- /caches/app.tar
- run:
name: Load Docker image layer cache
command: |
set +o pipefail
docker load -i /caches/app.tar | true
- run:
name: Build application Docker image
command: |
docker build --cache-from=app -t app .
- run:
name: Save Docker image layer cache
command: |
mkdir -p /caches
docker save -o /caches/app.tar app
- save_cache:
key: v1-{{ .Branch }}-{{ epoch }}
paths:
- /caches/app.tar
- deploy:
name: Push application Docker image
command: |
if [ "${CIRCLE_BRANCH}" == "master" ]; then
login="$(aws ecr get-login --region $ECR_REGION)"
${login}
docker tag app "${ECR_ENDPOINT}:${CIRCLE_SHA1}"
docker push "${ECR_ENDPOINT}:${CIRCLE_SHA1}"
fi

Answer 2

You need to specify a Docker image for your build to run in in the first place. This should work:
version: 2
jobs:
build:
docker:
- image: docker:stable-git
steps:
- checkout
- setup_remote_docker:
version: 17.05.0-ce
# build the image
- run: docker build -t $ECR_REPO:0.1 .