A DockerFile is basically a text file that is made up of all the commands which need to be run for building a Docker image. 

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Read more: https://javarevisited.blogspot.com/2022/05/docker-interview-questions-answers-for.html#ixzz7oQhGKJG2

curl -fsSL https://get.docker.com -o /tmp/get-docker.sh && sudo sh /tmp/get-docker.sh && \

sudo usermod -aG docker $USER && newgrp docker && \

newgrp docker && \

sudo curl -L "github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m)" -o /usr/bin/docker-compose && \

sudo chmod +x /usr/bin/docker-compose

$ curl -fsSL https://get.docker.com -o get-docker.sh

$ sudo sh get-docker.sh

FROM python:3.9-alpine

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ENV PYTHONUNBUFFERED 1

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# Install system dependencies

RUN apk update \

    && apk add --no-cache mariadb-dev build-base \

    && apk add --no-cache mariadb-connector-c

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# Set environment variables

ENV MYSQLCLIENT_CFLAGS="-I/usr/include/mariadb"

ENV MYSQLCLIENT_LDFLAGS="-L/usr/lib -lmariadb"

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WORKDIR /app

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COPY requirements.txt /app/requirements.txt

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RUN pip install --no-cache-dir -r requirements.txt

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COPY . /app

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RUN chmod +x /app/run.sh

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EXPOSE 8000

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CMD ["./run.sh"]

curl -sSL https://get.docker.com | sh

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

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#### base ####

# cache our node version for installing later

FROM node:18.3.0-slim as node

FROM ubuntu:focal-20220531 as base

ENV NODE_ENV=production

# Avoid running nodejs process as PID 1 (use tini)

# You may also need development tools to build native npm addons:

# apt-get install gcc g++ make

RUN apt-get update \

    && apt-get -qq install -y --no-install-recommends \

    tini \

    && rm -rf /var/lib/apt/lists/*

EXPOSE 3000

​

# new way to get node, let's copy in the specific version we want from a docker image

# this avoids depdency package installs (python3) that the deb package requires

COPY --from=node /usr/local/include/ /usr/local/include/

COPY --from=node /usr/local/lib/ /usr/local/lib/

COPY --from=node /usr/local/bin/ /usr/local/bin/

# reset symlinks

RUN corepack disable && corepack enable

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# create node user and group, then create app dir

RUN groupadd --gid 1000 node \

    && useradd --uid 1000 --gid node --shell /bin/bash --create-home node \

    && mkdir /app \

    && chown -R node:node /app

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WORKDIR /app

USER node

COPY --chown=node:node package*.json yarn*.lock ./

RUN npm ci --only=production && npm cache clean --force

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#### dev ####

# no source to be added, and assumes bind mount

FROM base as dev

ENV NODE_ENV=development

ENV PATH=/app/node_modules/.bin:$PATH

RUN npm install --only=development && npm cache clean --force

CMD ["nodemon", "index.js"]

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#### source ####

FROM base as source

COPY --chown=node:node . .

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#### test (as needed) ####

# FROM source as test

# ENV NODE_ENV=development

# ENV PATH=/app/node_modules/.bin:$PATH

# COPY --from=dev /app/node_modules /app/node_modules

# RUN npx eslint .

# RUN npm test

# CMD ["npm", "run", "test"]

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#### prod ####

FROM source as prod

ENTRYPOINT ["/usr/bin/tini", "--"]

CMD ["node", "index.js"]

softwareupdate --install-rosetta

# Add Docker's official GPG key:

sudo apt-get update

sudo apt-get install ca-certificates curl gnupg

sudo install -m 0755 -d /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

sudo chmod a+r /etc/apt/keyrings/docker.gpg

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# Add the repository to Apt sources:

echo \

  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \

  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \

  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

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# Install

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

brew install colima

colima start

docker ps -a