The document discusses the use of Docker in continuous integration (CI) and the roles of CI servers like Travis CI and Jenkins in streamlining development and testing environments. It highlights Docker's capability to provide isolated, consistent environments for running tests concurrently, including the use of containers for managing services. Key practices such as preparing identical development and testing setups are emphasized for effective parallel testing and improved execution times.

1. CONTINUOUS
INTEGRATION &&
DOCKER
GOING PARALLEL
byMichaelBodnarchuk @davert

2. WHO AM I?
Web developer with Ruby,
JavaScriptand PHP experience
Lead developer of
Space Traveler
Codeception PHP
TestingFramework

3. WHAT IS ALL ABOUT?
Developmentvs TestingEnvironment
UsingDocker for Testing
Overview of CI Servers
RunningParalellJobs

4. DEVELOPMENT
ENVIRONMENT
use same OS
use same PHP/Java/Ruby/Python version
use same services (Nginx, MySQL, Mongo)
use same configurations
setup fake smtp server

6. TESTING ENVIRONMENT
same as DevelopmentEnvironment
prepared to run on CI server
uses databasewithdata fixtures
should be cleaned after tests execution
maycontain additionalservices like Selenium

7. TESTING+DEVELOPMENT
SETUP
Use provisioning: Chef, Ansible, Puppet, ...
Create/delete databases for each testexecution
Solve isolation issues for paralleltesting

8. OR USE

9. WHAT IS DOCKER
Docker is an open platform distributed apps
Runs and manages isolated Linux containers
Provides GitHub-like infrastructure

10. Host
Container 1
Container 2
Container 3
Container ...
Docker Client
dockerpull
dockerrun
docker...
Docker Index
Docker Daemon

11. DOCKER IMAGES
Isolated Filesystem
BuiltbyDocker
Uses IncrementalFS Drivers
Can be stored in Docker Registry

12. IMAGES BUILT FROM DOCKERFILE
FROMfedora:20
RUN yuminstall-ymongodb-server&&yumcleanall
RUN mkdir-p/var/lib/mongodb&&
touch/var/lib/mongodb/.keep&&
chown-Rmongodb:mongodb/var/lib/mongodb
ADDmongodb.conf/etc/mongodb.conf
VOLUME["/data/db"]
EXPOSE27017
USERmongodb
WORKDIR/var/lib/mongodb
CMDmongod

14. DOCKER CONTAINER
Runningcontainer != bootingOS
No daemons willbe executed on start
Onlyone process can be run atonce

15. RUN CONTAINER$dockerrun-it-p27017:27017-v/var/www/project/data:/datamongo1

16. CONTINUOUS INTEGRATION (CI) IS A DEVELOPMENT
PRACTICE THAT REQUIRES DEVELOPERS TO INTEGRATE CODE
INTO A SHARED REPOSITORY SEVERAL TIMES A DAY. EACH
CHECK-IN IS THEN VERIFIED BY AN AUTOMATED BUILD,
ALLOWING TEAMS TO DETECT PROBLEMS EARLY.
thoughtworks.com/continuous-integration

17. TRAVIS CI

18. TRAVIS CI FEATURES
SaaS
Freefor opensourceprojects
Simple configuration
Virtualization viaOpenVPN/Docker
Concurrentbuilds
Plans startfrom 129$/month

19. JENKINS CI

20. JENKINS FEATURES
Free Hosted
Dozens of Plugins
The MostPopular and Trusted
Old-SchoolInterface

22. RUNNING PARALLEL
BUILDS
TravisCI: out-of-box. Runs same tests suites for different
language versions. I.e. PHP 5.3, 5.4, 5.5
JenkinsCI: usingmulti-configuration project(MatrixReloaded
plugin). Builds can be executed on slave servers.

23. BUILD MATRIX
1. Configure axis
2. Combinate values
3. Use currentvalues as environmentvars

24. CONFIGURATION MATRIX EXAMPLE

26. RUN CONCURENT JOBdockerrun-i-t-v$WORKSPACE:/projecttest_container./runtests.sh$SUITE

27. WHAT'S INSIDE TEST CONTAINER?
Testcontainer contain prepared database
./runtests.shstarts allrequired services (nginx, mysql,
selenium, redis, etc)
Container stops when tests are finished
No supervisors: we can execute onlyone process per run

28. RUNTESTS.SH
#!/bin/sh
echo"StartingServices...."
serviceelasticsearchstart>/dev/null2>&1
servicenginxstart>/dev/null2>&1
servicephp5-fpmstart>/dev/null2>&1
servicemysqlstart>/dev/null2>&1
servicememcachedstart>/dev/null2>&1
phantomjs--webdriver=4444>/dev/null2>&1&
mailcatcher-f >/dev/null2>&1&
echo"Runningtests"
cd/project/$1#switchtoapplication
codeceptrun$2#runtestsfromspecificsuite

29. LESSONS LEARNED
stopped containers should be removed
containers should be auto-rebuilton testdataupdates

30. CONCLUSIONS
Testexecution time can be improved byrunningtests in
parallel
Docker makes easyto run isolated concurrentbuilds

31. QUESTIONS?
Talk by
GitHub:
Projects: , ,
MichaelBodnarchuk @davert
DavertMik
Codeception Robo Task Runner JSter