The solution we have applied to reduce the container build time is to split the process into two steps and introduce a small bash script that executes those steps for us. Splitting the container build process into two steps This can quickly become cumbersome in a continuous deployment environment, especially for larger applications with many dependencies. This means those actions have to be repeated every time docker build is invoked on new code. Copying the source of your application invalidates the cache of any subsequent actions, such as the npm install, bundle install or any other build steps you might have defined. The onbuild hooks will copy the current directory to the source directory in the container and run the npm install during packaging resulting in a neat, ready to use container.Īn experienced Docker user may have spotted the problem already. The method illustrated in the readme of those images is as simple as a two line Dockerfile reading: FROM node:6-onbuild We realised that there is a downside to building application containers in the way that the official-Docker-platform ruby and node image documentation suggests. ![]() ![]() Packaging applications in Docker containers is part of the day-to-day continuous deployment workflow. The problem with the single build Dockerfile The article uses a Node.js application as an example, but these techniques are also applicable to building Ruby, Python and Go application containers. Finally, we expand that simple build script to one that is more modular and open for extension. We then walk you through writing a build script that not only builds an application container but also runs its unit tests, checks with the source repository for conflicts or unchecked changes and tags and pushes the final image to the container repository. In this article we will show how we build Docker application containers in two steps and explain why that is a useful thing to do.
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