Answer
FROM sets the base image for your container, for example FROM node:20-alpine or FROM ubuntu:22.04.
Quick Answer
FROM sets the base image — the starting point for your new image. Everything you build on top (RUN, COPY, etc.) layers on top of this base. FROM ubuntu:22.04 starts with Ubuntu; FROM node:20-alpine starts with Node pre-installed on Alpine. Choosing the right base image affects size, security, and compatibility.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ