Continuous integration with Docker (Android app example)

Continous integration with Docker. Based on Android app example.

Transcript

1. Continuous integration with Docker Michał Moczulski Poznań - 22.03.2018
2. Agenda • Continuous integration • Docker • Creating Docker image • CI in practice • Summary
3. Continuous integration • The process of continuously integrating new changes in the code. Every new change must be verified automatically • Prevents integrating code that is not compiling or passing tests • Allows for error detection and fixes on early stage
4. Docker • Allows for virtualization on operating system level using containers • The container is a lightweight version of VM • Containers are separated from each other and totally independent • Docker is available for free(“Community Edition” on Linux, OS X and Windows)
6. Creating Docker image • What is required to build an Android app? • Image must contain all tools required to build an Android application • Image is created based on Dockerfile • Images can be stored on hub.docker.com • https://github.com/mrmike/SimpleAndroidDocker
7. docker build -t simple-android-docker . docker run --rm simple-android-docker
8. Docker image • Let’s use our sample image • gradle clean build • https://github.com/mrmike/android-ci-sample
9. docker run --rm -v $(pwd):/workspace -w /workspace simple-android-docker gradle clean build
10. Cache • Is downloading all dependencies for every build needed? • Gradle cache can be used • $GRADLE_USER_HOME/caches • Cache can be used by one container at the time • https://github.com/gradle/gradle/issues/851
11. docker run --rm -v $DOCKER_GRADLE_CACHE:/gradle-cache” -e "GRADLE_USER_HOME=/gradle-cache" -v $(pwd):/workspace -w /workspace simple-android-docker gradle clean build
12. CI in practice
13. Travis CI • Easy configuration with YAML • We can take advantage of Gradle cache • Free for open source projects • https://github.com/mrmike/android-ci-sample/blob/master /.travis.yml
14. sudo: required language: java service: - docker before_install: - docker pull michalmoczulski/simple-android-docker script: - ./verify-build.sh
15. Circle CI • Easy configuration with YAML • 1500 build minutes for free • https://github.com/mrmike/android-ci-sample/blob/master /.circleci/config.yml
16. version: 2 jobs: build: docker: - image: michalmoczulski/simple-android-docker working_directory: ~/workspace steps: - checkout - run: gradle clean build
17. Jenkins - EC2 • Jenkins instance on EC2 • Blue Ocean plugin • Can be tailored to your needs • Can be costly and time consuming • https://github.com/mrmike/android-ci-sample/blob/master /Jenkinsfile
18. pipeline { agent any stages { stage('clean-build') { steps { sh './verify-build.sh' } } } environment { DOCKER_GRADLE_CACHE = '/path/gradle-cache' } }
19. DEMO
20. Summary (1/2) • All dependencies requires to build an app in one place(an image) • Fits any CI system supporting Docker • Scalable solution • Repeatable test environment
21. Summary (2/2) • How to distribute an image? (Dockerfile, Docker Hub, Amazon ECR) • How to version the image? (tag latest may be not enough) • How to maintain the image?
22. Links (1/2) • Simple Android Docker - Github • Android CI Sample App - Github • Simple Android Docker - Docker hub • docs - docker.com • Set Up a Jenkins Build Server (AWS) • Docker Basics for Amazon ECS
23. Links (2/2) • Using Docker in Builds - Travis CI • CI with Docker - CircleCi.com • How is Docker different from a normal virtual machine? • Blue Ocean - Jenkins.io • Continuous Integration -ThoughtWorks.com • sdkmanager - developer.android.com
24. Any questions?
25. Thanks! • moczul@gmail.com • https://github.com/mrmike/ • https://twitter.com/moczul • https://www.linkedin.com/in/michal-moczulski/