Docker 101

1. Docker
Arnon Rotem-Gal-Oz

2. Linux Containers

3. What’s isolated?

4. So what is Docker then?

5. Registries

6. Docker Daemon

7. “Ogres are like onions.
Ogres have layers,
Onions have layers…
You get it? We both have layers”

8. The Dockerfile

9. FROM scratch
COPY helloWorld /
CMD [“/helloWorld“]

10. FROM node:8.2.1-onbuild
EXPOSE 8083
CMD [“npm“,
”—max_old_space_size=8192”,”start”]

11. FROM node:8.2.1
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
ONBUILD ARG NODE_ENV
ONBUILD ENV NODE_ENV $NODE_ENV
ONBUILD COPY package.json /usr/src/app/
ONBUILD RUN npm install && npm cache clean --force
ONBUILD COPY . /usr/src/app
CMD [ "npm", "start" ]

12. FROM ubuntu:14.04
# Read docker build command line --build-arg
ARG EXTENSION=local
ENV EXTENSION ${EXTENSION}
ENV DEBIAN_FRONTEND noninteractive
ENV HOME /root
RUN apt-mark hold initscripts udev plymouth mountall
RUN dpkg-divert --local --rename --add /sbin/initctl && ln -sf /bin/true /sbin/initctl
RUN sed -i "/^# deb.*multiverse/ s/^# //" /etc/apt/sources.list
RUN apt-get update
RUN apt-get install -y supervisor openssh-server git python-pip python-dev build-essential sudo net-tools lxde-core lxde-icon-theme
x11vnc xvfb screen openbox nodejs wget htop bmon nano lxterminal locales autocutsel curl
RUN pip install numpy
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
RUN apt-get update
RUN apt-get -f install google-chrome-stable -y
RUN apt-get install -y --no-install-recommends fonts-thai-tlwg fonts-wqy-zenhei language-pack-zh-hans language-pack-zh-hans-base
RUN apt-get update && apt-get install -y fcitx fcitx-keyboard fcitx-pinyin fcitx-sunpinyin leafpad
RUN apt-get autoclean && apt-get autoremove && rm -rf /var/lib/apt/lists/*
ADD etc/apt/sources.list.d/tor.list /etc/apt/sources.list.d/tor.list
RUN gpg --keyserver keys.gnupg.net --recv A3…89
RUN gpg --export A3…89 | sudo apt-key add -
RUN apt-get update
RUN apt-get install -y tor deb.torproject.org-keyring
ADD noVNC /noVNC
ADD startup.sh /
ADD supervisord.conf /
ADD root/.config/lxpanel/LXDE/panels/panel /root/.config/lxpanel/LXDE/panels/panel
RUN echo Using extention ID $EXTENSION ==============================================================================================
ADD $EXTENSION.json /opt/google/chrome/extensions/$EXTENSION.json
RUN chmod 777 /opt/google/chrome/extensions/$EXTENSION.json
ADD root/dist.crx /root/dist.crx

13. Docker CLI
• docker build
• docker images
• docker push
• docker run
• docker ps
• docker inspect
• docker logs
• docker rm
• docker mi
• docker restart

14. Tip of the day
# remove all stopped containers and remove all untagged images
docker rm $(docker ps -a -q)
docker rmi $(docker images | grep "^<none>" | awk "{print $3}")

15. Why does it work?
separation of concerns…
• Developer
• Worries about what’s “inside” the
container
• His code
• His Libraries
• His Package Manager
• His Apps
• His Data
• All Linux servers look the same
• Ops
• Worries about what’s “outside” the
container
• Logging
• Scaling
• Monitoring
• Environment configuration
• All containers start, stop, copy,
attach, migrate, etc. the same way
http://www.slideshare.net/dotCloud/docker-intro-november