What is a Docker layer and how does layer caching benefit the build process?

Docker Fundamentals Medium

Docker Fundamentals — Medium

What is a Docker layer and how does layer caching benefit the build process?

Key points

  • Docker layers are immutable and created by each instruction in a Dockerfile
  • Layer caching stores unchanged layers to speed up rebuilds
  • Prevents re-execution of instructions for unchanged layers
  • Improves iterative development process by reducing build time

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