How do I set up a Docker executor in CircleCI?

How do I set up a Docker executor in CircleCI?

To set up a Docker executor in CircleCI, you need to define it in your .circleci/config.yml file. Would you like a sample configuration?

Yes, please provide a sample configuration.

Here's a basic example:

version: 2.1
executors:
  docker-executor:
    docker:
      - image: circleci/python:3.8
jobs:
  build:
    executor: docker-executor
    steps:
      - checkout
      - run: echo "Hello, CircleCI!"
workflows:
  version: 2
  build:
    jobs:
      - build

This sets up a Python 3.8 Docker image. Do you need help with anything else?

What if I want to use a different Docker image?

You can simply replace the image field in the configuration with the desired Docker image. For example, to use Node.js, you would change it to image: circleci/node:14.

Can I run multiple Docker containers in a single job?

Yes, you can run multiple Docker containers by using the docker key to define multiple images in the executor. You can also use Docker Compose for more complex setups.