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CircleCI

The right image for every build

Run on blazing-fast convenience images, resource-optimized machine executors, or your own custom containers. Maximum speed, total control.

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Build image options that work for you

Start builds instantly

Use our Docker convenience images, pre-loaded with optimized tools and ready for CI. Zero setup time.

Full control when you need it

Run on machine executors with complete system access, or bring your own Docker images for specific requirements.

Performance by default

Every CircleCI image is optimized for speed by CI experts. Run lean without the maintenance.

Fast builds, your way

Convenience images that deliver

Pre-built, performance-tuned Docker images for every major language and framework. Get running in seconds.

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Machine executors for heavy lifting

Full-system access for resource-intensive builds, with optimized specs for CI performance.

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Custom image support

Use your own Docker images while leveraging CircleCI’s speed optimizations and caching.

Build your own image 

Always up to date

CircleCI images are continuously updated with patches and performance improvements. No maintenance needed.

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Avvir

“It worked out of the box with pre-built images, [and] we were able to easily configure specific images for parts that needed more customization.”

Tira OdhnerCTO at Avvir

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Tutorial

Using the Docker execution environment

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Blog post

Creating a custom Docker image to run your CI builds

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Guide

Migrating from Docker to machine

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>build the future

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