Vers des applications twelve-factor

88b8138397e1d1441f4e4a54348bde09?s=47 ubermuda
October 24, 2014
Technology
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Vers des applications twelve-factor

La méthodologie "12 factor" (http://12factor.net/) promet des applications SaaS (Software-as-a-Service) plus maintenables et scalables.

Comment ? Pourquoi ? Voyons ensemble quelles sont les préconisations de cette méthodologie développée par des ingénieurs d'Heroku, et comment les appliquer dans des applications basées sur le framework Symfony2, avec l'aide de la technologie la plus prometteuse du moment : Docker.

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ubermuda

October 24, 2014
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Transcript

  1. Vers des applications twelve-factor Avec Symfony et Docker Geoffrey Bachelet

    geoffrey.io / @ubermuda

  2. 12factor.net

  3. None

  4. Use declarative formats for setup automation Clean contract with the

    underlying operating system Suitable for deployment on modern cloud platforms Minimize divergence between development and production Can scale up without significant changes ”

  5. Codebase Dependencies Config Backing services Build, release, run Processes Port

    binding Concurrency Disposability Dev/prod parity Logs Admin processes

  6. Codebase

  7. Codebase Question de vocabulaire

  8. Codebase une app = une base de code ("codebase")

  9. Codebase = un repo git/hg/svn

  10. Codebase 2 codebases =! un app

  11. Codebase = un système distribué ("distributed system")

  12. Distributed System Web WS Worker

  13. Codebase 1 codebase -> plusieurs déploiements ("deploy")

  14. Codebase Prod Pré-prod Dev C.I.

  15. Codebase one app = one codebase multiple codebases = a

    distributed system one codebase -> many deploys

  16. Dependencies

  17. System-wide vs Project-wide

  18. None

  19. Dependencies Declaration composer.json bower.json packages.json ...

  20. Dependencies Isolation bin/ autoload ...

  21. Outils système ? curl, imagemagick, ...

  22. Pas de "shell out" ! si obligatoire, inclure le binaire

    dans les dépendances

  23. Config

  24. Resource handles to the database, Memcached Credentials to external services

    such as Amazon S3 or Twitter Per-deploy values such as the canonical hostname for the deploy ”

  25. Séparation stricte de la config et du code.

  26. app/config/parameters.yml

  27. Il est possible de créer d'autres fichiers ! app/config/apis.yml

  28. 12 factor recommande les variables d'environnement

  29. Incenteev/ParameterHandler env-map

  30. docker run -e FOO=bar -e TOTO Docker

  31. web: image: debian:wheezy environnement: - FOO=bar - TOTO Fig

  32. Backing services

  33. A backing service is any service the app consumes over

    the network as part of its normal operation. ”

  34. Datastore (MySQL, PgSQL, Redis, ...) SMTP (Postfix, Mandril, ...) Message

    Queue (RabbitMQ, ZeroMQ, ...) API tierce (Twitter, Facebook, etc)

  35. App Ambassador MySQL Redis MySQL Ambassador Ambassador Ambassador

  36. App Ambassador Ambassador Facebook Twitter Health check, Cache, etc.

  37. Build, release, run

  38. The twelve-factor app uses strict separation between the build, release,

    and run stages. ”

  39. Téléchargement des dépendances Construction des assets Build

  40. Build docker build

  41. composer install ...et la méchante "GitHub API Rate"

  42. FROM debian:wheezy Dockerfile

  43. - FROM debian:wheezy + FROM acme/base Dockerfile

  44. FROM debian:wheezy RUN composer config -g \ github-oauth.github.com \ a1b2c3d4e5...

    acme/base Attention à la sécurité !

  45. Release docker push Possiblement sur un registry privé

  46. RUN docker run / fig up

  47. Processes

  48. Twelve-factor processes are stateless and share-nothing. ”

  49. App App Volumes Cache, Sessions, etc.

  50. App App Volumes Cache, Sessions, etc. NOPE

  51. App Volumes App Volumes Redis Ambassador

  52. App Volumes App Volumes Redis Ambassador Sessions Cache

  53. Assets ?! uploads, avatars, etc.

  54. Amazon S3 ou autre

  55. Port binding

  56. The twelve-factor app is completely self-contained

  57. Self-contained?!

  58. That's my fetish.

  59. Docker docker run -P

  60. Chaque application peut devenir un "backing service".

  61. Concurrency

  62. stateless + share-nothing = scalable

  63. Web Reverse Proxy App App Ambassador MySQL

  64. Reverse Proxy App App App Ambassador MySQL Let's rock.

  65. Background jobs AMQP App Worker Worker Worker

  66. Disposability

  67. Web Reverse Proxy App App App Ambassador MySQL

  68. Reverse Proxy App App App Ambassador MySQL J'ai piscine

  69. ChaosMonkey https://github.com/Netflix/SimianArmy/wiki/Chaos-Monkey

  70. App Ambassador MySQL Redis MySQL Ambassador Ambassador Ambassador

  71. App Ambassador MySQL Redis MySQL Ambassador Ambassador Ambassador PG M'A

    TUER

  72. App Ambassador MySQL Redis MySQL Ambassador Ambassador Ambassador LOL

  73. App Ambassador MySQL Redis MySQL Ambassador Ambassador Ambassador MySQuoi ?

  74. Dev/prod parity

  75. Objectifs Réduire la friction entre le dev et la prod

    Réduire le "time-to-first-deploy" Faciliter l'intégration continue

  76. Docker Permet d'avoir des environnements de dev très proches de

    la production.

  77. Fig Facilite l'orchestration.

  78. web: image: mytepee/web ports: [80] links: [db:db] volumes_from: [cache, config,

    data] environment: [...] db: image: orchardup/mysql environment: [...] cache: image: busybox command: /bin/true volumes: [/root/.composer/cache, /root/.cache/bower] config: image: busybox command: /bin/true volumes: [/app/config] data: image: busybox command: /bin/true volumes: [/app/web/uploads, /app/web/media, ..., /app/app/cache, /app/app/logs] fig.yml Attention à la sécurité !

  79. Fig Pas (encore) d'orchestration "remote". Outils tierce (Flocker, Panamax, etc.)

  80. Logs

  81. A twelve-factor app never concerns itself with routing or storage

    of its output stream. ”

  82. ...each running process writes its event stream, unbuffered, to stdout

    ”

  83. Difficile d'être twelve-factor avec Symfony.

  84. ELK Elasticsearch + Logstash + Kibana

  85. David Pilato @dadoonet Atelier : Hands on Elasticsearch & Kibana

  86. David Pilato @dadoonet Atelier : Hands on Elasticsearch & Kibana

    HIER

  87. Olivier Dolbeau @odolbeau Talk : Laisse pas trainer ton log

    !

  88. Olivier Dolbeau @odolbeau Talk : Laisse pas trainer ton log

    ! HIER

  89. Olivier Dolbeau @odolbeau http://odolbeau.fr/blog/when-monolog-meet-elk.html When Monolog meet ELK

  90. Admin processes

  91. One-off admin processes should be run in an identical environment

    as the regular long-running processes of the app. ”

  92. Container spécialisé ? docker run acme/cli ...

  93. docker exec docker exec acme_web ... 1.3

  94. Fig fig run

  95. Run a one-off command on a service. For example: $

    fig run web python manage.py shell By default, linked services will be started, unless they are already running. If you do not want to start linked services, use `fig run --no-deps SERVICE COMMAND [ARGS...]`. fig.yml

  96. Ce qu'il faut retenir.

  97. Twelve-factor = Recommandations

  98. stateless / share-nothing

  99. ELK http://odolbeau.fr/blog/when-monolog-meet-elk.html

  100. Fig http://www.fig.sh/

  101. Ambassador pattern https://docs.docker.com/articles/ambassador_pattern_linking/

  102. Questions ? geoffrey.io / @ubermuda geoffrey.io/books/discovering-docker.html Merci !