How to build a Docker image without a cache?
Aug 01, 2025 am 04:34 AMTo build a Docker image without using the cache, pass the --no-cache flag to the docker build command; this ensures all layers are rebuilt from scratch, avoiding outdated dependencies or stale layers, which is useful for debugging, ensuring fresh package installations, achieving reproducible builds in CI/CD pipelines, and after changing base images or dependencies, and to clean up unused cache, run docker builder prune or docker builder prune --all for a complete cleanup.
To build a Docker image without using the cache, you just need to pass the --no-cache
flag to the docker build
command.

Why Disable the Cache?
Docker caches intermediate layers during the build process to speed things up on subsequent builds. While helpful, this can sometimes cause issues—like outdated dependencies being reused—especially if a RUN
command installs packages that have since been updated. When you want a completely fresh build, bypassing the cache ensures every step runs as if it's the first time.
How to Build Without Cache
Use the --no-cache
option:

docker build --no-cache -t your-image-name:tag .
For example:
docker build --no-cache -t myapp:v1 .
This tells Docker to ignore any cached layers and rebuild everything from scratch.

Key Points to Know
- All layers are rebuilt: Every
RUN
,COPY
, andADD
instruction will execute fresh. - Slower builds: Since nothing is reused, expect longer build times.
- Consistent results: Useful in CI/CD pipelines or when debugging to eliminate cache-related surprises.
When to Use It
You might want to disable the cache in these situations:
- Debugging a failing build that might be using stale cached layers.
- Ensuring the latest versions of packages are installed (e.g.,
apt-get update
,npm install
). - In production build pipelines where reproducibility and freshness are critical.
- After changing base images or dependencies and suspecting cached layers are interfering.
Bonus: Clean Up Unused Cache (Optional)
Even with --no-cache
, old build cache can consume disk space. Periodically clean it with:
docker builder prune
To remove all unused build cache:
docker builder prune --all
This helps maintain a clean environment, especially on shared or resource-limited systems.
Basically, just add --no-cache
and you're good—no hidden tricks.
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