Docker for Frontend Engineers

In this (internal) workshop, I led a session to familiarize a group of frontend engineers with Docker.

This version of the workshop was held at an internal meetup at Royal Schiphol Group in October 2017.

Transcript

2. Let's talk about Docker
3. Docker History • 1979: Unix V7
4. Docker History • 1974: Matijs born • 1979: Unix V7 • 2001: Linux VServer • 2008: Linux Containers (LXC) • 2013: Docker ⚠ learn more: dcmnt.me/2hjIl5V
5. • lightweight virtual environment • faster startup than virtual machines • focus is on "do one thing, well"
6. What Docker is not • not good at running multiple processes • not suitable for all kinds of applications • not (very) good at distributed stateful applications
7. What is Docker used for?
8. What is Docker used for? ⚠ learn more: dcmnt.me/2hjIl5V
10. Docker Basics OS Download URL dcmnt.me/2hmxGYm dcmnt.me/2hmtbgp
12. Docker Basics • Docker Runtime • Docker Images
13. Docker Runtime
14. Docker Runtime
15. Docker Images • Tarball of OS and application • built from a Dockerfile • can use Docker Compose, Packer, Ansible etc.
16. Dockerfiles • plain-text files with little magic
17. Dockerfiles • plain-text files with little magic • contain instructions on how a Docker Image should be built
18. FROM alpine CMD ["echo", "Hello ✈ "] ⚠ learn more: dcmnt.me/2hkSoHQ
20. FROM alpine CMD ["echo", "Hello ✈ "]
21. FROM alpine CMD ["echo", "Hello ✈ "]
22. FROM withmethod/alpine-base:3.6 RUN apk add --no-cache nodejs=6.10.3-r1 nodejs-npm=6.10.3-r1
23. FROM withmethod/alpine-base:3.6 RUN \ apk \ add \ --no-cache \ nodejs=6.10.3-r1 \ nodejs-npm=6.10.3-r1
24. 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}
25. 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"]
26. 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"]
27. 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"]
28. 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"]
29. 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"]
30. 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"]
32. Building Images • docker build . • docker build --file single-line.Dockerfile . ⚠ learn more: dcmnt.me/2zOHtNn
33. Pulling Images • docker pull alpine ⚠ learn more: dcmnt.me/2hkr1xO
34. Running Images • docker run $containerName $command • docker run alpine /bin/echo "Hello " ⚠ learn more: dcmnt.me/2zOdR2Q
35. Running Images • docker run $containerId • docker run a125 ⚠ learn more: dcmnt.me/2zOdR2Q
36. Running Images • docker run $containerName • docker run busybox echo "Hello " ⚠ learn more: dcmnt.me/2zOdR2Q
37. Listing Images • docker images
38. 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
40. 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
41. Handout dcmnt.me/2zOkcva