unsorted stuff and comments

dockerers.md

There are many types of Dockerfile practices

common dude

RUN apt-get update && \
    apt-get install -y nodejs npm && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

common dude v2

RUN \
    apt-get update && \
    apt-get install -y nodejs npm && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

indent fetishist

RUN    apt-get update \
    && apt-get install -y nodejs npm \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

2014 guy

RUN apt-get update
RUN apt-get upgrade -y
RUN apt-get install -y nodejs npm

oneliner

RUN apt-get update && apt-get upgrade -y && apt-get install -y nodejs npm && apt-get clean

variabler

ARG PACKAGES="nodejs npm"
RUN apt-get update && \
    apt-get install -y ${PACKAGES} && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*