During pipeline execution, many dependencies and intermediate artifacts are generated. Caching these for reuse in subsequent pipelines can effectively reduce build time.

Runner Node Caching

To balance single-point-of-failure risks with cache hit rates, pipelines are assigned to 3 runner nodes by default (the number adjusts dynamically with resource usage).

Tips

Node assignments are not permanent — they may change as the platform scales.

Code Caching

When a pipeline executes, it automatically pulls code to the runner node and caches it for reuse by subsequent pipelines.

File Caching

During builds, files like project dependencies and build caches can be cached on the runner node for reuse by subsequent pipelines.

Declare the cache directories through docker.volumes. The following example caches the npm dependency directory on the runner node, so subsequent builds can reuse it without downloading dependencies again:

.cnb.yml

main:
  push:
    - docker:
        image: node:20
        volumes:
          - /root/.npm:copy-on-write # Cache npm dependencies for reuse
      stages:
        - name: install
          script: npm install
        - name: test
          script: npm test

• copy-on-write leverages OverlayFS instant-copy technology, allowing caches to be efficiently reused under high concurrency.
• See grammar for volume types and formats.

Cross-Node Caching

Node caching takes effect on the current runner node only. To share the same cache across all nodes, you can build the content to be cached into a Docker image for cross-node sharing.

For specific methods, reference the built-in task: docker:cache

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