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Let's talk about Docker

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Docker History • 1979: Unix V7

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Docker History • 1974: Matijs born • 1979: Unix V7 • 2001: Linux VServer • 2008: Linux Containers (LXC) • 2013: Docker ⚠ learn more: dcmnt.me/2hjIl5V

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• lightweight virtual environment • faster startup than virtual machines • focus is on "do one thing, well"

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What Docker is not • not good at running multiple processes • not suitable for all kinds of applications • not (very) good at distributed stateful applications

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What is Docker used for?

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What is Docker used for? ⚠ learn more: dcmnt.me/2hjIl5V

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Docker Basics OS Download URL dcmnt.me/2hmxGYm dcmnt.me/2hmtbgp

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Docker Basics • Docker Runtime • Docker Images

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Docker Runtime

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Docker Runtime

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Docker Images • Tarball of OS and application • built from a Dockerfile • can use Docker Compose, Packer, Ansible etc.

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Dockerfiles • plain-text files with little magic

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Dockerfiles • plain-text files with little magic • contain instructions on how a Docker Image should be built

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FROM alpine CMD ["echo", "Hello ✈ "] ⚠ learn more: dcmnt.me/2hkSoHQ

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FROM alpine CMD ["echo", "Hello ✈ "]

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FROM alpine CMD ["echo", "Hello ✈ "]

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FROM withmethod/alpine-base:3.6 RUN apk add --no-cache nodejs=6.10.3-r1 nodejs-npm=6.10.3-r1

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FROM withmethod/alpine-base:3.6 RUN \ apk \ add \ --no-cache \ nodejs=6.10.3-r1 \ nodejs-npm=6.10.3-r1

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FROM withmethod/alpine-base:3.6 ENV IMAGE_VERSION=6.10.3-r1 RUN \ apk \ add \ --no-cache \ nodejs=${IMAGE_VERSION} \ nodejs-npm=${IMAGE_VERSION}

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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FROM withmethod/alpine-nodejs:6.10.3-r1 ENV IMAGE_NAME=loop-and-crash ENV IMAGE_VERSION=1.4.3 ENV WORKDIR=/tmp WORKDIR "${WORKDIR}" ADD "https://github.com/withmethod/${IMAGE_NAME}/archive/${IMAGE_VERSION}.tar.gz" "${WORKDIR}" RUN \ tar xzf "${IMAGE_VERSION}.tar.gz" \ && \ rm -rf "${WORKDIR}/${IMAGE_VERSION}.tar.gz" WORKDIR "${WORKDIR}/${IMAGE_NAME}-${IMAGE_VERSION}" RUN npm install --production USER "alpine" EXPOSE 2774 CMD ["npm", "start"]

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Building Images • docker build . • docker build --file single-line.Dockerfile . ⚠ learn more: dcmnt.me/2zOHtNn

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Pulling Images • docker pull alpine ⚠ learn more: dcmnt.me/2hkr1xO

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Running Images • docker run $containerName $command • docker run alpine /bin/echo "Hello " ⚠ learn more: dcmnt.me/2zOdR2Q

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Running Images • docker run $containerId • docker run a125 ⚠ learn more: dcmnt.me/2zOdR2Q

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Running Images • docker run $containerName • docker run busybox echo "Hello " ⚠ learn more: dcmnt.me/2zOdR2Q

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Listing Images • docker images

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Listing Images docker \ run \ --name portainer \ --privileged \ --detach \ -p 9000:9000 \ -v /var/run/docker.sock:/var/run/docker.sock \ -v ~/Sites/docker-data/portainer/:/data \ portainer/portainer \ --no-auth \ -H unix:///var/run/docker.sock ⚠ learn more: dcmnt.me/2zOdrtm

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Takeaways • Containers are not new but require different thinking • Docker Images work best when they are minimal • Do not overcomplicate your image's build instructions • Security is hard, so ask around for best-practices

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Handout dcmnt.me/2zOkcva

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