Cohesion Techsessie Docker - Daniel Palstra
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This document summarizes a presentation about Docker. It discusses why Docker is useful for cloud computing, how it aims to reduce the time between writing code and deploying it, and how Docker is now widely used without much notice. It then covers topics like the difference between Docker images and containers, building Dockerfiles, linking and networking containers, logging inspection, the Docker Hub registry, and orchestration tools like Docker Machine, Swarm and Compose. The presentation highlights pros like standardized deployments and easy DevOps workflows, and cons like complexity and a rapidly evolving ecosystem.
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Cohesion Techsessie Docker - Daniel Palstra
- 3. Let’s talk Docker.. @dpalstra Daniël Palstra
- 6. It’s pretty much the best thing for cloud computing since the movement from bare metal to virtual machines Ho Ming Li (DockerCon 2014 attendant)
- 7. Docker aims to reduce the cycle time between code being written and code being tested, deployed, and used. James Turnbull (author of The Docker Book)
- 8. Docker is one of those technologies that, without any great fuss and without anyone noticing, is now everywhere. […] I wouldn’t call Docker a “Swiss Army Knife” — it has so many more uses than that. Dr Mike Norman (Cloud Services Architect @ JP Morgan)
- 10. Dev to Ops the old way..
- 12. Dev to Ops the new way!
- 13. #whoami • Daniël Palstra • Docker Trainer @ Amazic • DevOps consultant & engineer (self employed) • Middleware & cloud technologies • 10+ yrs IT experience • @dpalstra
- 14. DevOps means giving a shit about your job enough to want to learn all the parts and not just your little world. John E. Vincent (blog.lusis.org)
- 23. The real value of Docker is not technology, it’s getting people to agree on something. Solomon Hykes (Founder of Docker)
- 25. Almost everything in Google runs in a container. Brian Dorsey (Google Cloud)
- 26. What is Container Virtualisation? • Alternative to “traditional” virtualisation on Hypervisors such as VMWare • No guest operating system (or booting) required for containers • Virtualisation layer runs as an application inside the host OS • Sandboxed execution environment • Lightweight, high performance (especially on bare metal hardware)
- 28. Where does Docker fit in? • Built on top of Linux container technology (LXC, AUFS) • Provides tools to build, run, share and version “images” • Handles communication between running “containers” (network, fs) • Docker containers run practically everywhere • Extremely reproducible; you could start from scratch every time!
- 30. Images versus Containers • Docker images consist of one or more read-only layered file-systems • The bottom layer is called the base image (Linux kernel, e.g. Red Hat) • A Dockerfile is the equivalent of a build file to create an image • Docker containers are the running, stateful instances of images • Modified containers can also be committed back to images
- 33. FROM jboss/wildfly MAINTAINER Bastiaan Schaap <http://github.com/siteminds> RUN /opt/jboss/wildfly/bin/add-user.sh --silent admin admin ADD sample.war /opt/jboss/wildfly/standalone/deployments/ EXPOSE 8080 EXPOSE 9990 Sample Dockerfile
- 34. Volumes Where did my data go?
- 35. Volumes and mounting • Share directories and files with • Docker Containers • Docker Hosts • Define volumes • Runtime (docker run -v) • Build time (VOLUME /path/to/my/directory) • Ambassador containers • Pluggable!
- 37. Container linking • Container Port mapping • Docker linking system • Name containers and provide link docker run --name web --link db:mongodb -d -p 8080:80 nginx
- 38. Logging & inspection What’s happening in my env?
- 39. Logging • Multiple log driver support • Container != Host logging docker logs -f nostalgic_morse docker inspect -f '{{ .NetworkSettings.IPAddress }}' nostalgic_morse 172.17.0.5
- 40. Docker Hub Where to get my images from?
- 41. • Cloud-based registry service • Official images • User defined images • On premis solution available • Connect with Github Docker Hub
- 42. Docker Toolbox Cool! How do I get started?
- 43. • Docker Client • Docker Machine • Docker Compose (Mac only) • Docker Kitematic • VirtualBox Docker Toolbox
- 44. Docker Machine • Simplify creation and configuration of Docker Hosts (inc security) • Boot2docker >> docker-machine • Multiple providers: … $ docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM default * virtualbox Running tcp://192.168.99.100:2376 swarm-01 digitalocean Running swarm-02 digitalocean Running
- 45. Docker Compose • Define and run multi container applications • Complete application lifecycle management • Orchestration tool combined with Machine and Swarm web: build: . ports: - "5000:5000" volumes: - .:/code links: - redis redis: image: redis
- 47. Docker Swarm • Docker Host clustering • Smart Container Scheduling • Docker-Machine & Docker compose Integration • Pluggable Node Discovery • Container communication over multiple hosts (experimental)
- 51. Pros • Standardized way of getting code from development to produc • Easy to use DevOps workflow • Fast container startup • Isolation of processes and their configuration • Amazing growth in functionality
- 52. Cons • Very easy to do, can be very hard to do right • Networking can be difficult • Ecosystem evolving (rapidly) • Which orchestration tools/platforms/frameworks to use
- 55. Demo time!
Editor's Notes
- Some hands for who already heard of Docker before Some hands for who already played around Docker Some hands for who already use Docker in production
- If you don’t believe me let’s have a look at what other people are saying about Docker
- Docker has taken the world by storm. Docker clearly solves some problems, otherwise adaptation wouldn’t be as huge as it is today. Although Docker isn’t perfect (yet), and doesn’t fix all continuous delivery problems, it does a damn good job at making our DevOps life a bit easier.
- Does this look familiair? Numerous deployments to numerous kinds of Operating systems.
- The modern process. Dev delivers standard packages which can be deployed by anyone in the same way every time over and over. Ops only cares about keeping the platform stable where the packages (containers) live
- Building DevOps solutions. Considers himself half dev half ops. Strong background in middleware and SOA. Believes in delivering software at anytime and any moment. Will only allow himself to use cool software that brings customers forward. Hates the phrase “because we’re always doing it like this”.
- So what is DevOps? I think John E. Vincent nails it with his definition. DevOps is about caring enough about the stuff you build to take responsibility for it from inception until decommission.
- Ok let’s get this thing started. Why are we are we here in the first place? What problem are we going to solve?
- The big problem challenge in 2015 IT solutions. Multiple services and apps build on different technologies. Multiple hosting providers build on top of different “hosting technologies”. How can we get everything to work with each other without tight coupling every app with each other. Hands please for people who have seen this problem before.
- But there is hope! We IT guys are not the first ones to run into problems like these. Logistics suffered from this problem years and years ago. Let’s have a look at how things where done in the old days.
- Dockers in the old days!
- Dockers nowadays
- Transportation managed to agree on the delivery process. Wouldn’t it be great if we follow there footsteps and use that same process.
- Docker containers and docker hosts can have there own logging mechanism. Docker supports multiple logging drivers which can be used by containers or hosts. By default docker logs to JSON format. Docker log https://docs.docker.com/reference/logging/overview/ Next to docker logs docker inspect can be used to check the health of a container and a docker host
- If your favorite platform isn’t linux one should download the Docker toolbox to get started. The docker toolbox consists of components that get
- If your favorite platform isn’t linux one should download the Docker toolbox to get started. The docker toolbox consists of components that get
- http://www.quora.com/What-is-the-best-Docker-Linux-Container-orchestration-tool
- https://gist.github.com/botchagalupe/53695f50eebbd3eaa9aa