Jobs that require a complete Linux virtual machine (VM) image ( machine) may use an Ubuntu version supported by the list of available machine images.These images are not a full operating system, so they will generally make building your software more efficient. The pre-built CircleCI Docker image from the CircleCI Docker Hub will help you get started quickly without learning all about Docker. Jobs that require Docker images ( docker) may use an image for Node.js or Python.A container or virtual machine is the term used for a running instance of an image. An image is a packaged system that has the instructions for creating a running environment. circleci/config.yml by specifying the executor type and an appropriate image.
It is possible to specify a different executor type for every job in your.
An executor defines the underlying technology or environment in which to run a job, and which image to use to best-suit your project. Each job defined in your project configuration is run in a separate execution environment, either a Docker container or a virtual machine.įor each job in your project config you will specify an execution environment by assigning it an executor. CircleCI offers several execution environments: Docker, Linux VM (virtual machine), macOS, Windows, GPU and Arm.
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