Streamlining DevOps with Docker | Galway Tech Meetup | December 10th 2014

Transcript

1. Streamlining DevOps with Docker Colm Hally, DevOps Engineer @colmhally Dec 2014
2. 1. The Development Cycle 2. What is Docker 3. All about Containers 4. Sharing via Docker Registries 5. Benefits for Devs & Ops 6. Demo 7. Q & A Agenda 2
3. Development Cycle 3 Developer laptop Systems Integration Staging Production Your application needs to run in many different environments Takes time to ensure everything is setup 'just-so' Testing / CI
4. Introducing Docker 4 ! Containerise your app including all its dependencies ! Distribute your app in this standard container ! Run it on any machine Virtual Machine Vs Docker Container
5. Docker Containers 5 ! Your container is: ! Your app ! ALL its dependencies ! Wrapped up in a package ! Defined in a Dockerfile ! docker build -t myreg/mycontainer . ! docker push myreg/mycontainer
6. 6 Sharing via Docker Registries ! Docker Registries ! Like Git repos, but for Docker containers ! Docker Hub ! Like GitHub ! 1000s of base images, incl. most popular services ! Publish your own.. ! Build: docker build -t myreg/mycontainer . ! 'Ship': docker push myreg/mycontainer ! Run: docker run myreg/mycontainer
7. ! portability; avoid ecosystem lock in Why is this useful? 7 ! separation of concerns between teams ! developers: everything inside the box ! ops: everything outside the box ! streamlines the development - deployment cycle
8. ! Freedom to choose language + toolchain ! Easily run multiple instances of your app ! Dev env looks like a cloud ! Sharing of Docker images ! No nasty installations - just Docker & Git ! Same development environment across whole team Docker for Devs 8
9. ! “Black box” deployable ! Dependencies are a non-issue ! Containers work across cloud providers Docker for Ops 9 Database Web App 1 Web App 2 Message Broker Load Balancer Analytics Job Server ! Easy colocation - apps are isolated on the server
10. ! Happier developers :) ! Friendlier ops :) ! Development environment maps the production environment Docker - Nett Benefits 10 DB App App Server MQ LB App App Job Server Job MQ LB DB €€ ! Better utilisation of limited server resources
11. ! Demo: ! Build a simple NodeJS web app ! Encapsulate in a Docker container ! Deploy it on a server ! Spin up more instances ! Dockerfile: ! Uses community NodeJS image ! Adds our source code ! Installs dependencies ! Defines start command “I’ll believe it when I see it" 11