How to integrate CD with CircleCI? - continuous-integration

Question

I've been following a lot of tutorials on CI using Python but the tutorials seem to stop there and rarely take the next step to CD. I'm a sole developer as well.
I've setup a project on Github that runs locally on my PC and is not a web app. I've connected it to CircleCI for CI. Here is my config.yml file.
version: 2
jobs:
build:
docker:
- image: circleci/python:3.7
working_directory: ~/repo
steps:
# Step 1: obtain repo from GitHub
- checkout
- run:
name: install dependencies
command: |
sudo apt-get update
pip install -r requirements.txt
- run:
name: run tests
command: |
python -m pytest -v
Everything runs great and I get an email from CircleCI alerting me the build failed when I make a push to master on github and one the of the pytests fail.
So my question, is what is the next step here? I have a few thoughts but am not sure on any of them honestly.
Create separate test and prod versions of the code. Automate updating the prod version when the test version builds with no errors. However, not sure what tools to use for this.
Push to project to Dockerhub. This seems redundant to me though, because Docker would run the same pytests that CircleCI is running. I'm not sure how this would even help with CD at this point.
Could someone please provide some guidance on next steps here?

Answer 1

Currently you have only one job build, so you can add more jobs under the jobs section. So what you want to do here is:
add test
build prod version
Push to Dockerhub
Please use config 2.1 to enable the workflows.
version: 2.1
jobs:
build:
docker:
- image: circleci/python:3.7
working_directory: ~/repo
steps:
# Step 1: obtain repo from GitHub
- checkout
- run:
name: install dependencies
command: |
sudo apt-get update
pip install -r requirements.txt
- run:
name: run tests
command: |
python -m pytest -v
test:
docker:
- image: circleci/python:3.7
steps:
- checkout
- run: echo "do your test here"
build-prod:
docker:
- image: circleci/python:3.7
steps:
- checkout
- run: echo "build your app"
push-to-dockerhub:
docker:
- image: circleci/python:3.7
steps:
- checkout
- setup_remote_docker # this is necessary to use docker daemon
- run: echo "do docker login and docker push here"
workflows:
build-and-push:
jobs:
- build
- test
requires:
- build
- build-prod
requires:
- test
- push-to-dockerhub
requires:
- build-prod
Please make sure we're using requires to run the job only when the required job is finished successfully.
Well definitely I've not tested the config on my end, but it's like above config. You have more configuration documents here - so please take a look for it to make it perfectly work.
https://circleci.com/docs/2.0/configuration-reference/