Testing with Docker

1. Testing with Docker Tom Offermann @toffermann June 17, 2014

2. Introduction

3. ‣What’s the Problem? Testing in Varied Environments ! ‣Our Solution Step-by-Step Explanation Presentation Overview

5. What’s the Problem? What Does New Relic Do?

6. What’s the Problem?

7. What’s the Problem? Is Best!

8. What’s the Problem? Python versions

9. What’s the Problem? Python versions frameworks

10. What’s the Problem? Python versions frameworksdatabases

11. What’s the Problem? Python versions frameworksdatabases database clients

12. What’s the Problem? Python versions frameworksdatabases database clients How do we test all of these scenarios?

15. Our Solution ✤ Create Docker Images ✤ Run a Test Container ✤ Packnsend

16. Our Solution ✤ Create Docker Images ✤ Run a Test Container ✤ Packnsend

17. Create Docker Images # Dockerfile for memcached! ! FROM ubuntu:12.04! ! RUN apt-get update! RUN apt-get install -y memcached! ! EXPOSE 11211! ENTRYPOINT ["memcached"]! CMD ["-p", "11211"]! USER daemon!

18. Create Docker Images $ tree python_agent/docker ! ! python_agent/docker! ...! !"" mysql! # $"" Dockerfile! !"" postgresql! # $"" Dockerfile! ...! $"" redis! $"" Dockerfile!

19. Our Solution ✤ Create Docker Images ✤ Run a Test Container ! ✤ Packnsend

20. Our Solution ✤ Create Docker Images ✤ Run a Test Container • Install testing tools ! ✤ Packnsend

21. Testing Tools x 4

22. Testing Tools x 4 tox

23. Testing Tools x 4 tox virtualenv

24. Our Solution ✤ Create Docker Images ✤ Run a Test Container • Install testing tools • Copy source code ! ✤ Packnsend

25. Copy Source Code Technique #1: Pull! ! ! $ docker run test-image test.sh ! ! --repo http://github.com/nr/python-agent ! ! tox -c tests/tox.ini! !  

26. Copy Source Code Technique #1: Pull! ! ! $ docker run test-image test.sh ! ! --repo http://github.com/nr/python-agent ! ! tox -c tests/tox.ini! !   Downside: Requires commit to git repository

27. Copy Source Code Technique #2: Host-Mounted Volume! ! ! $ docker run -v /path/to/repo:/code ! ! test-image test.sh tox! !  

28. Copy Source Code Technique #2: Host-Mounted Volume! ! ! $ docker run -v /path/to/repo:/code ! ! test-image test.sh tox! !   Downside: Problematic with boot2docker

29. Copy Source Code Technique #3: Docker ADD to Image! ! ! $ DATA_DIR=`mktemp -d $TMPDIR/packnsend.XXXXXXXX`! ! $ git checkout-index --prefix=$DATA_DIR/ -a!

30. Copy Source Code Technique #3: Docker ADD to Image! ! # Dockerfile for Test Image! # Copy to $DATA_DIR! FROM python-base! ! RUN chown -R guest.users /data! RUN chmod 0755 /data! USER guest! ENV HOME /home/guest! ! ADD . /data! VOLUME /data!

31. Copy Source Code Technique #3: Docker ADD to Image! ! # Dockerfile for Test Image! # Copy to $DATA_DIR! FROM python-base! ! RUN chown -R guest.users /data! RUN chmod 0755 /data! USER guest! ENV HOME /home/guest! ! ADD . /data! VOLUME /data!

32. Copy Source Code Technique #3: Docker ADD to Image! ! ! $ IMG_NAME="packnsend-`date '+%Y%m%d%H%M%S'`-$$"! ! $ cd $DATA_DIR && ! docker build --rm -t $IMG_NAME .!

33. Our Solution ✤ Create Docker Images ✤ Run a Test Container • Install testing tools • Copy source code • Use service containers ! ✤ Packnsend

34. Use Service Containers Linking Docker Containers! ! ! $ docker run -d --name db mysql! ! $ docker run -d --link db:db —name test $IMG_NAME!

35. Use Service Containers Linking Docker Containers! ! ! DB_PORT_3306_TCP_ADDR=172.17.0.5! DB_PORT_3306_TCP_PORT=3306! DB_PORT_3306_TCP_PROTO=tcp! DB_PORT_3306_TCP=tcp://172.17.0.5:3306! DB_PORT=tcp://172.17.0.5:3306!

36. Use Service Containers Linking Docker Containers! ! $ docker run -d ! --name $DATA_IMAGE_NAME ! --link packnsend-gearmand:gearmand ! --link packnsend-memcached:memcached ! --link packnsend-postgresql:postgresql ! --link packnsend-mysql:mysql ! --link packnsend-devpi:devpi ! --link packnsend-squid:squid ! --link packnsend-mongodb:mongodb ! --link packnsend-redis:redis ! $IMG_NAME!

37. Our Solution ✤ Create Docker Images for Services ✤ Running a Test Container • Install testing tools • Copy source code • Use services • Run test command ! ✤ Packnsend

38. Run Test Command ! $ docker run -d ! --name $DATA_IMAGE_NAME ! --link packnsend-gearmand:gearmand ! --link packnsend-memcached:memcached ! --link packnsend-postgresql:postgresql ! --link packnsend-mysql:mysql ! --link packnsend-devpi:devpi ! --link packnsend-squid:squid ! --link packnsend-mongodb:mongodb ! --link packnsend-redis:redis ! $DATA_IMAGE_NAME ! ! tox -c tests/tox.ini!

39. Our Solution ✤ Create Docker Images for Services ✤ Running a Test Container ! ✤ Packnsend

40. Packnsend packnsend: COMMAND [arg...]! ! Run Commands:! run Run command on test container.! run -i Run command interactively.! shell Launch a shell on test container.! ! Management Commands:! ! init Pull images, if authorized, else build.! build Build base images.! push Push base images.! pull Pull base images.! start Start base containers.! stop Stop base containers.! cleanup Delete base images.!

41. Packnsend Demo!

42. Our Solution ✤ Create Docker Images for Services ✤ Running a Test Container ✤ Packnsend • Launcher Script !

43. Launcher Script ! #!/bin/sh! ! . /data/docker/environ! ! "$@" > /data/out.log 2>&1! ! STATUS=$?! ! cp /data/out.log /tmp/out.log! ! exit `expr $STATUS`!

44. Launcher Script ! #!/bin/sh! ! . /data/docker/environ # Set Env Vars! ! "$@" > /data/out.log 2>&1! ! STATUS=$?! ! cp /data/out.log /tmp/out.log! ! exit `expr $STATUS`!

45. Source Environ # Add environment variables! export PACKNSEND_DB_USER=db_user! ! # Munge existing environment variables! # We have this form! # DEVPI_PORT=tcp://172.17.0.6:3141! ! if test -n "$DEVPI_PORT"! then! ! BASE=`echo $DEVPI_PORT | sed -e ’s/tcp/http/'`! ! PATH=packnsend/testing/+simple/! ! export PIP_INDEX_URL=$BASE/$PATH! fi

46. Launcher Script ! #!/bin/sh! ! . /data/docker/environ! ! "$@" > /data/out.log 2>&1 # Log Output! ! STATUS=$?! ! cp /data/out.log /tmp/out.log! ! exit `expr $STATUS`!

47. Launcher Script ! #!/bin/sh! ! . /data/docker/environ! ! "$@" > /data/out.log 2>&1! ! STATUS=$? # Capture Exit Code! ! cp /data/out.log /tmp/out.log! ! exit `expr $STATUS`!

48. Our Solution ✤ Create Docker Images for Services ✤ Running a Test Container ✤ Packnsend • Launcher Script • Automatic Cleanup

49. Automatic Cleanup ! cleanup_containers()! {! ! docker kill $CONTAINER_ID! ! docker rm --volumes $CONTAINER_ID! ! ! docker rmi $IMAGE_ID! ! ! rm -r $DATA_DIRECTORY! }!

50. Automatic Cleanup ! cleanup_containers()! {! ! docker kill $CONTAINER_ID! ! docker rm --volumes $CONTAINER_ID! ! ! docker rmi $IMAGE_ID! ! ! rm -r $DATA_DIRECTORY! }!

51. Our Solution ✤ Create Docker Images ✤ Run a Test Container ✤ Packnsend • Launcher Script • Automatic Cleanup • Remote Docker Daemon !

52. Remote Docker Daemon ! # SSH Tunnel! ! $ export EC2=<ec2 address>! $ ssh -f ubuntu@$EC2 -L 14243:$EC2:2375 -N ! ! ! # Set DOCKER_HOST environment variable! ! $ export DOCKER_HOST="localhost:14243"

53. Our Solution ✤ Create Docker Images ✤ Run a Test Container ✤ Packnsend • Launcher Script • Automatic Cleanup • Remote Docker Daemon • Parallel Tests !

54. Parallel Tests # test_commands.txt! packnsend run tox -c tests/tox1.ini! packnsend run tox -c tests/tox2.ini! packnsend run tox -c tests/tox3.ini! packnsend run tox -c tests/tox4.ini! packnsend run tox -c tests/tox5.ini! packnsend run tox -c tests/tox6.ini! ...! ! # Run tests in parallel! ! $ cat test_commands.txt | parallel!

55. Conclusion

56. Testing with Docker Tom Offermann @toffermann June 17, 2014

Testing with Docker

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