Source to Deployment with Gradle & Docker

SOURCE TO
DEPLOYMENT WITH
GRADLE & DOCKER

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WHO AM I
John Engelman
Chief Software Technologist
Team Member
Gradle plugin author and contributor
DevOps aficionado
@
j
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Ratpack
github.com/johrengelman

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TOPICS
1. Gradle Intro
2. Docker Intro
3. Continuous Integration w/ Gradle
4. Packing An App w/ Docker & Gradle
5. Continuous Deployment w/ Docker

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WHAT IS GRADLE?
1. Expressive, declarative, & maintainable build language
2. Dependency Resolver & Manager
3. Build Task Scheduler & Executor
4. Build By Convention
Gradle is an opinionated framework on top
of an unopinionated toolkit
- Szczepan Faber

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WHAT GRADLE IS NOT!

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It is NOT Groovy Ant!
(That tool exists -> )
GANT

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CORE GRADLE FEATURES
1. Build-By-Convention w/ Flexibility
2. Project & Build Groovy DSL
3. Support for Ivy & Maven Dependencies
4. Multi-Project Builds
5. Easy to add custom logic
6. 1st class integration w/ Ant builds
7. Extensive public API and plugin ecosystem
8. Task UP-TO-DATE checking

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GRADLE IS FLEXIBLE
Just because it is written in Java
doesn't mean project must be Java

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a
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/
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PLUGIN COMPOSITION
Gradle plugins can react to other plugins

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v
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WHAT IS DOCKER?
Application Container
Isolated process
Portable Packaging

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WHY IS THIS GOOD?
Abstracts application language & build chain
Write once, run anywhere (*)
Define OS level dependencies into application package
Eliminate "works on my machine"
Increase resource utilization of machines

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DOCKER CONTAINERS
VS.
VIRTUAL MACHINES
Smaller distribution
Share the OS
Package only the necessities
Isolate each process
Process specific user space, network stack, & filesystem

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DOCKER IMAGES & CONTAINERS

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DOCKER IMAGE
A docker image is:
A read-only virtual file system...
Comprised of layers...
With atomic changes to the previous (parent) layer...

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DOCKER CONTAINER
A docker container is:
A process...
With a read-write layer...
On top of a image...
And additional meta-data (env vars, networking config,
etc.)

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DOCKER & CONTINUOUS
DEPLOYMENT

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Docker is a useful tool for continuous application
deployment.
Define the entire deployable from the ground up
On commit, only need to build upwards from the 1st
changed layer
Deploy only the changed layers to the server

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BUILD PIPELINES

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┌
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┘

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KEY COMPONENTS

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Gradle Application Plugin
Gradle Docker Plugin
Boot2Docker*

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BASIC CONTINUOUS INTEGRATION

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a
p
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j
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$ g
r
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d

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APPLICATION DISTRIBUTIONS
a
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"

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$ g
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t
T
a
r

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CONFIGURING GRADLE &
BOOT2DOCKER

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p
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$ g
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┌
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DOCKER MACHINE

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$ d
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$ $
(
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m
a
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_
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>
)

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DEPLOYING DOCKER CONTAINERS

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DOCKER SECURITY

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CONCERNS
Docker daemon runs as root
Gradle-Docker integration is unauthenticated

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Source to Deployment with Gradle & Docker

Source to Deployment with Gradle & Docker

John Engelman

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