Interview Q&A / Docker & Kubernetes
Docker & Kubernetes interview questions
Images, containers, Dockerfiles, pods and deployments, from first principles.
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- Why do Node.js Dockerfiles use npm ci and copy package.json before the source code?
Copying package.json first lets Docker cache the dependency layer, so npm only reinstalls when dependencies change. npm ci installs exactly what package-lock.json lists, giving reproducible builds.
IntermediateQuick answer1 min read