What is Docker?

Docker Belgium meetup #1 notes on what Docker is and how it can be used.

Transcript

1. What is docker? Docker Belgium - #dockerbel Nils De Moor - @ndemoor
2. • Nils De Moor • CTO & co-founder at WooRank • #node #mongo #ansible #automation #devops About me
3. Why docker? Source: https://www.docker.io/learn_more/
4. Why docker? Source: https://www.docker.io/learn_more/
5. Why docker? Source: https://www.docker.io/learn_more/
6. • Isolation • Portability • Compatibility • Automation • Speed Why docker? “Run anything... anywhere”
7. • LXC Containers • “Chroot on steroids” • AUFS • layered view on merged directories • copy-on-write What and how?
8. git clone github.com/ndemoor/dockerbel git checkout hello-world
9. • Install docker in vagrant box • Execute commands “Hello world” docker run ubuntu echo Hello World docker run ubuntu touch /tmp/test docker ps -a docker diff [CONTAINER_ID] docker run -d ubuntu /bin/sh -c "while true; do date; sleep 1; done" docker ps docker logs [CONTAINER_ID]
11. BUILDING Images Source: https://docs.docker.io
12. • Scripting language • Automated builder • Create images • Cached Dockerfile
13. git checkout building-images
14. FROM ubuntu # make sure the package repository is up to date RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update # install memcached RUN apt-get install -y memcached # run as user daemon (memcached doesn't allow to run as root) USER daemon # expose memcached port EXPOSE 11211 # Launch memcached when launching the container ENTRYPOINT ["memcached"]
15. Source: http://www.funnymemes.com/wp-content/uploads/ 2013/08/Cute-memes-sharing-is-caring.jpg
16. Sharing images Source: https://www.docker.io/learn_more/
17. Sharing images Source: https://www.docker.io/learn_more/
18. • Roll-your-own image repository • Share images privately • https://github.com/dotcloud/docker-registry Docker Registry
19. • Public image repository • Similar to npm, PyPI, bower, apt, yum, ... • Trusted builds • Search from docker cli • https://index.docker.io Docker index
20. docker login docker push dockerbel/memcached
22. git checkout application
23. FROM ubuntu ENV NODE_VERSION 0.10.24 # Install common packages RUN apt-get update RUN apt-get install -y wget # Install node RUN mkdir /opt/node-$NODE_VERSION RUN wget -O /tmp/node-$NODE_VERSION.tar.gz http://nodejs.org/ dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-x64.tar.gz RUN tar zxf /tmp/node-$NODE_VERSION.tar.gz --strip-components=1 --no-same-owner -C /opt/node-$NODE_VERSION RUN ln -s /opt/node-$NODE_VERSION/bin/node /usr/local/bin/node RUN ln -s /opt/node-$NODE_VERSION/bin/npm /usr/local/bin/npm ADD . /var/www RUN cd /var/www && npm install EXPOSE 3000 CMD [ "node", "/var/www/server.js" ]
24. # run memcache container docker run -d -name memcache dockerbel/memcached # run app container, linked to memcache container docker run -d -p 3000:3000 -e ENV=dev -link memcache:mc -v /tmp/log/app:/var/log/app:rw -name app dockerbel/app
25. • Maturity (1.0 in the next months) • Pluggable approach • Wider OS support • More filesystem options What’s next?
26. • Deis - deployment and orchestration • Dokku - deployment • Fig - deployment • Flynn - deployment and orchestration • Shipyard - monitoring Community
27. Questions?
28. Thank you! Docker Belgium - #dockerbel Nils De Moor - @ndemoor Psst... we’re hiring