How can I pull a Docker image in CircleCI?

How can I pull a Docker image in CircleCI?

To pull a Docker image in CircleCI, you can use the docker command in your config file. Here's a basic example:

version: 2.1
jobs:
  build:
    docker:
      - image: circleci/python:3.8
    steps:
      - checkout
      - run:
          name: Pull Docker Image
          command: docker pull your-image-name:tag

What if I need to use a private Docker registry?

If you're using a private Docker registry, you'll need to authenticate first. You can do this by adding your credentials in the CircleCI project settings or using the docker login command in your config file.

Can I cache Docker images to speed up builds?

Yes, you can cache Docker images in CircleCI to speed up your builds. Use the docker executor and specify caching in your config file. Here's an example:

version: 2.1
jobs:
  build:
    docker:
      - image: circleci/python:3.8
    steps:
      - setup_remote_docker:
          version: 20.10.7
          docker_layer_caching: true
      - run:
          name: Pull Docker Image
          command: docker pull your-image-name:tag