Reduce build time with Docker
One weird trick to reduce build time! CI services hate him!
This is a fairly simple way to reduce your build time if you spend a lot of time bundling dependencies prior to performing tests or deployments in CI.
The trick is to bundle any build dependencies into a Docker image so that you don’t have to install them each time you run a job.
Let’s take a look at my .gitlab-ci.yml
file that I used in “GitLab Review Apps with Zeit’s Now.sh service”:
As you can see above, I’m installing build dependencies for now
with npm install -g now --silent
in both the start_review
and stop_review
pipeline stages. This is unnecessary and is done every single time a job runs (not DRY). If you run enough builds, that’s a significant amount of time wasted.
Let’s build a simple Docker image that includes the now
dependency:
With a simple .gitlab-ci.yml
file to push the image to the GitLab container registry:
Now, instead of pulling from image: node
in our initial .gitlab-ci.yml
, we can use image: my.registry/hugo/now-image:latest
and remove the section of our .gitlab-ci.yml
where we install our build dependencies, because they’re already bundled!
Now we’ve shaved a bit of time off our builds 👌
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