Reduce Layers

Each RUN, COPY, and ADD instruction adds a new layer to your image. Combining commands helps reduce the number of layers and the overall image size.

Inefficient:

RUN apt-get update
RUN apt-get install -y python
RUN apt-get install -y pip

Efficient:

RUN apt-get update && apt-get install -y \
    python \
    pip \
 && rm -rf /var/lib/apt/lists/*