Docker 101 - Speaker Deck

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Docker 101

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What is Docker?

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Why is it different?

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VM model vs Docker model

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Pros

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● Rapid app deployment ● Portability ● Version control ● Lightweight ● Inmutable ● ...

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Cons

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● New tooling needed ● Addoption ● Orchestration ● <- putYourOwn

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Hands on!

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docker-machine $ docker-machine create --driver virtualbox jt $ eval $(docker-machine env jt)

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docker run $ docker run -it ubuntu d9f46b212a12fba0091f0f...

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docker images vs docker ps $ docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE ubuntu latest d55e68e6cc9c 5 days ago 187.9 MB $ docker ps CONTAINER ID IMAGE COMMAND CREATED... 12fba0091f0f ubuntu "sleep 10s" 2 seconds ago... c8e8b387fba7 ubuntu "yes" 2 seconds ago...

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docker logs $ docker run -d ubuntu find / db943d94d68011757ffad50a94727ec0fda1a70245f1b6c09f46... $ docker logs db943d94d68011757ff1b6c09f46... | head -n4 / /.dockerinit /etc /etc/resolv.conf

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registry

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docker pull $ docker pull ubuntu Using default tag: latest latest: Pulling from library/ubuntu 9377ad319b00: Pull complete a82f81f25750: Pull complete b207c06aba70: Pull complete d55e68e6cc9c: Pull complete library/ubuntu:latest: The image you are pulling has... Digest: sha256:a2b67b6107aa6b1a387e75eebafd7c...

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docker push $ docker tag d55e68e6cc9c agonzalezro/jt $ docker push agonzalezro/jt The push refers to a repository [docker.io/agonzalezro/jt] (len: 1) d55e68e6cc9c: Image successfully pushed b207c06aba70: Image successfully pushed a82f81f25750: Image successfully pushed 9377ad319b00: Image successfully pushed latest: digest: sha256:b385f1dfb6fcda517d1... size: 7739

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extra cmds

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$ docker stop $ docker pause $ docker unpause $ docker start $ docker rm $ docker rmi ... AKA RTM

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Dockerfiles

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Dockerfile FROM debian:stable RUN apt-get update && apt-get install -y --force-yes apache2 EXPOSE 80 443 VOLUME ["/var/www", "/var/log/apache2", "/etc/apache2"] ENTRYPOINT ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]

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What to do next? $ docker build -t agonzalezro/jt . $ docker push agonzalezro/jt

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Compose

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docker-compose.yml db: image: postgres ports: - “5432” companies: links: -db web_core: build: ../web_core command: bundle exec rails s -p 3000 -b ‘0.0.0.0’ ports: - ”3000:3000”