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Deploying with Docker (SymfonyTN)

Deploying with Docker (SymfonyTN)

Docker, l'une des technologies les plus en vogue ces derniers temps, permet de créer des conteneurs logiciels. Retour sur mon utilisation pour le développement mais également pour la production, avec en ligne de mire : une architecture micro-services, quelques principes 12 Factors et un déploiement en (presque) "zero-downtime".

Online slides: http://slides.williamdurand.fr/deploying-with-docker/
Sources: https://github.com/willdurand-slides/deploying-with-docker

William Durand

April 17, 2015

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  1. Containers A container is an operating‑system level virtualization method that

    provides a completely isolated environment, simulating a closed system running on a single host. chroot, OpenVZ, Jail, LXC, etc.
  2. Docker Developed by Docker.inc (formerly DotCloud) Open platform for developing,

    shipping, and running applications Use as execution driver libcontainer
  3. Docker's Architecture Host Container 1 Container 2 Container 3 Container

    ... Docker Client docker pull docker run docker ... Docker Index Docker Daemon
  4. The Plan Simple solution to deploy my application Idempotent and

    reliable process No need for rollbacks Targetting zero downtime Single host
  5. Twelve Factors One codebase tracked in revision control, many deploys

    Store config in the environment Keep development, staging, and production as similar as possible 12factor.net
  6. Services Reverse proxy: (+ ) Backend: + + application Sessions

    are stored into Database (MySQL) Hipache Redis Nginx HHVM memcached
  7. Application's fig.yml web: build: . # No support for `env-file`

    yet... # See: https://github.com/docker/fig/pull/665 environment: - SYMFONY_ENV=dev - SYMFONY_DEBUG=1 - SYMFONY__MEMCACHED_HOST=memcached - SYMFONY__MEMCACHED_PORT=11211 - SYMFONY__SESSION_MEMCACHED_PREFIX=session - SYMFONY__SESSION_MEMCACHED_EXPIRE=604800 links: - memcached - database
  8. Data Only Containers Data, logs, etc. MUST live in data

    only containers: # fig.yml redis: image: redis volumes_from: - dataredis dataredis: image: busybox volumes: - /data Wanna backup? ė docker run --rm \ --volumes-from dataredis \ -v $(pwd):/backup \ busybox \ tar cvf /backup/dataredis.tgz /data
  9. Application's Dockerfile FROM debian:wheezy MAINTAINER William Durand <[email protected]> ENV DEBIAN_FRONTEND

    noninteractive # Let APT know about HHVM repo... RUN apt-get update -y RUN apt-get install -y nginx hhvm supervisor # Configure Nginx, HHVM, Supervisor here... ADD . /app WORKDIR /app EXPOSE 80 CMD [ "/usr/bin/supervisord" ]
  10. DNS example.org w www.example.org Configured at the DNS level. Faster

    than making this redirection using the load balancer.
  11. SSL Hipache listens on ports 80 and 443. Patched version

    of Hipache to redirect HTTP traffic to HTTPS. Sort of SSL offloading. ® willdurand/docker‑hipache
  12. 1. Build Artifact git archive --format tar --prefix myapp/ <SHA>

    | (cd /tmp && tar xf -) Protip: use a Docker container to run : build tools cd /tmp/myapp docker run --rm -v `pwd`:/srv buildtools composer install docker run --rm -v `pwd`:/srv buildtools bundle install docker run --rm -v `pwd`:/srv buildtools bower install rm <USELESS/TEMP FILES>
  13. 3. Push It docker push q Or whatever that makes

    the image available on the production server.
  14. 5. Run The New Container fig run -d --no-deps --rm

    web † Booting the container may take a few seconds, wait.
  15. 6. Register It As Backend IP=$(docker inspect --format='{{ .NetworkSettings.IPAddress }}'

    <CID>) fig run --rm rediscli rpush frontend:www.example.com "http://$IP:80" # fig.yml rediscli: image: redis entrypoint: [ redis-cli, -h, redis ] links: - redis
  16. 7. Unregister Previous Backends For each container id CID in

    $RUNNING_CIDS, do: IP=$(docker inspect --format='{{ .NetworkSettings.IPAddress }}' <CID>) fig run --rm rediscli lrem frontend:www.example.com 0 "http://$IP:80" † New backend is up and serves requests. However, previous backends may still process requests. Wait.
  17. 8. Stop Previous Containers For each container id CID in

    $RUNNING_CIDS, do: docker stop <CID>
  18. This Is My Vision Use (or ) to write your

    migration scripts Put you migration scripts under version control Test your migration scripts Applying your migration scripts should be done asynchronously (i.e. not tied to a deployment) This is tricky (i.e. not easy) You need a plan! Phinx Flyway
  19. Adding A New Column/Table 1. Prepare your migration before modifying

    your code 2. Apply your migration 3. Update your code
  20. Modifying A Column Type 1. Create a new column with

    the new type as a migration 2. Apply your migration 3. Create a migration to populate the new column 4. Apply your second migration 5. Update your code to use this new column (your code should deal with both columns) 6. Rename the first column as "deprecated", and the new one using the original name 7. Remove hacks introduced in 5
  21. Renaming A Column/Table 1. Create a new column or table

    with the new name rather than "renaming" it 2. Apply your migration 3. Update your code to use the new column/table but keep using the former 4. Create a migration to populate the new column/table 5. Apply your migration 6. Update your code to use the new column/table 7. Rename the former column/table as "deprecated" 8. Remove hacks introduced in 3
  22. Deleting A Column/Table Rename it rather than deleting it. Wait

    for a maintenance party to delete *_deprecated columns and/or tables. Protip: when marking a column/table as deprecated, add the date too: _deprecated_2015_01_01.
  23. Making Changes On The Data Avoid it as long as

    you can, but sometimes, there are no other alternatives. This implies a maintenance mode: be careful! 1. Put your service in maintenance mode 2. Apply your changes 3. Put your service back online
  24. 1. Run boom boom https://www.example.org/ -n 2000 -c 50 Server

    Software: nginx/1.2.1 Running GET https://www.example.org/ Running 2000 times per 50 workers. [====================================================>.] 99% Done -------- Results -------- Successful calls 2000 Total time 137.1827 s Average 6.7114 s Fastest 2.3701 s Slowest 9.4738 s Amplitude 7.1037 s -------- Status codes -------- Code 200 2000 times.
  25. 2. Deploy fab deploy --hide=running,stdout,stderr ---> Deploying branch "awesome-feature" --->

    Building artifact ---> Artifact id is: "build-8fe47fc" ---> Pushing artifact to the server ---> Building container ---> Finding running containers ---> Starting new container ---> Waiting while container is booting ---> Registering new backend to Hipache ---> Unregistering the previous backends from Hipache ---> Waiting before stopping the previous backends Done. q I use . Fabric
  26. 3. Monitor Elasticsearch, Logstash, Kibana + Logstash Forwarder (lumberjack) ®

    willdurand/docker‑elk ® willdurand/docker‑logstash‑forwarder
  27. wercker.yml box: wercker-labs/docker build: steps: - script: name: install Fig

    code: | curl -L https://.../fig-`uname -s`-`uname -m` > fig ; chmod +x fig sudo mv fig /usr/local/bin/fig - ...
  28. 1. Build Artifact - script: name: build artifact code: |

    FAB_DIST_DIR="$WERCKER_OUTPUT_DIR" \ bin/fabric build:commit="$WERCKER_GIT_COMMIT"
  29. 2. Build a Docker Image - script: name: build image

    code: | cd "$WERCKER_OUTPUT_DIR/build-$WERCKER_GIT_COMMIT" fig -f "$WERCKER_SOURCE_DIR/fig.yml.dist" build web
  30. 3. Run a Container - script: name: run container code:

    | cd "$WERCKER_OUTPUT_DIR/build-$WERCKER_GIT_COMMIT" fig -f "$WERCKER_SOURCE_DIR/fig.yml.dist" run -d web sleep 20
  31. 4. Run Tests \o/ - script: name: run test suite

    code: | export IP=$(docker inspect --format='{{ .NetworkSettings.IPAddress }}'\ "$(docker ps -q | head -n 1)") echo "IP address is: $IP" | tee "$WERCKER_REPORT_MESSAGE_FILE" bin/test
  32. Smoke Testing require "httparty" describe "The web server" do before(:all)

    do ip = ENV["IP"] or 'localhost' @response = HTTParty.get( "http://#{ip}:80", :basic_auth => { :username => "privatedemo", :password => "please" } ) end it "should return a 200 status code" do @response.code.should == 200 end end + = 쁥 RSpec httparty
  33. Fig & Environments Keep development, staging, and production as similar

    as possible X. Dev/prod parity — 12 Factors # fig.yml.dist web: # In PRODUCTION, the line below MUST be COMMENTED: build: . # In PRODUCTION, the line below must be UNCOMMENTED: # image: myapp # ...