Persisting Cache Directories

Modern software development relies on countless dependencies

Filling caches takes time

Syntax is similar to mounting secrets

# syntax = docker/dockerfile:experimental
FROM ubuntu
RUN --mount=type=cache,target=/tmp/cache \
    ls -l /tmp/cache

–

Demo: Persisting Cache Directories

Enable BuildKit:

export DOCKER_BUILDKIT=1

Run build:

docker build \
    --progress plain \
    --file Dockerfile.cache-warm \
    .

Run build:

docker build \
    --progress plain \
    --file Dockerfile.cache-check \
    .