Let's Get Acquainted: Ansible! / Symfony Camp UA 2014

Let's Get Acquainted: Ansible!

Transcript

1. Igor Brovchenko Let's Get Acquainted:
2. About me • Engineer • Chief Software Engineer at Swivl • Symfony Camp UA Igor Brovchenko igor.Brovchenko@gmail.com @tigordev
3. What is Ansible? • Ansible is an IT automation tool (Python) • Free, open source (github) • Simply • Clear (anyone) • Fast (to learn, setup) • Complete (modules) • Efficient (runs on OpenSSH) • Secure (without agents)
4. Use cases • Server provisioning • Server orchestration • Application deployment • Continues Integration • …
5. Who uses Ansible? Over 1 Million Downloads Over 900 contributors and 8000 ★s on GitHub
6. Other tools • fabric • capistrano (capifony) • puppet • chef • saltstack
7. Ansible 1.7.2 • Development - 1.8 • A new major release of Ansible approximately every 2 months.
8. Control Machine Requirements • Red Hat • Debian • CentOS • OS X • any of the BSDs • Windows isn’t supported for the control machine • Ansible 1.8: Windows will be fully supported Python 2.6
9. Managed Node Requirements • Python 2.4 • Starting in version 1.7, Ansible contains support for managing Windows machines
10. https://galaxy.ansible.com/
12. http://www.ansible.com/tower
14. Symfony Deployment 1. Update the code 2. Update vendor dependencies 3. Running database migrations 4. Update Assetic Assets 5. Clearing the cache 6. Other Things…
15. Symfony Deployment $ git pull $ php composer.phar install $ php app/console doctrine:migrations:migrate —no-interaction $ php app/console assets:install web —symlink $ php app/console assetic:dump --env=prod $ php app/console cache:clear
16. Directory Structure `-- /var/www/example.com |-- current → /var/www/example.com/releases/20141012131539 |-- releases | `-- 20141012131539 | `-- 20141009150741 | `-- 20141031145325 `-- shared |-- web | `-- uploads |-- logs `-- config `-- parameters.yml
17. Installing the Control Machine (Mac OSX) $ brew update $ brew install ansible $ ansible-galaxy install servergrove.symfony2
18. Installing the Control Machine (Mac OSX) $ ls /usr/local/etc/ansible hosts roles $ ls /usr/local/etc/ansible/hosts/roles servergrove.symfony2
19. Deploy $ ansible-playbook app/config/playbook_deploy.yml $ ansible-playbook -l localhost app/config/playbook_deploy.yml -vvv
20. playbook_deploy.yml - hosts: stage-app vars: symfony2_project_name: Deploy the application symfony2_project_root: /var/www/example.com symfony2_project_release: '{{ current_timestamp.stdout }}' symfony2_project_repo: git@github.com:ingvar/ExampleApp.git symfony2_project_branch: release symfony2_project_php_path: /usr/local/php55/bin/php symfony2_project_env: prod symfony2_project_console_opts: '--no-debug' symfony2_project_composer_opts: '--no-dev --optimize-autoloader' roles: - servergrove.symfony2 tasks: - local_action: osx_say msg="Deployment complete." voice=Zarvox
21. Inventory (hosts) [localhost] localhost ansible_connection=local [stage-app] stage.example.com ansible_connection=ssh [prod-app] www1.example.com www2.example.com www[10:50].example.com [databases] db-[a:f].example.com
22. Inventory (hosts) $ ansible localhost -m command "echo \"Hello World\" " $ ansible prod-app -m ping
23. Ansible Structure • Inventory • Modules • Ad Hoc Commands • Playbooks • Tasks • Variables • Templates • Handlers • Roles
24. Modules • Cloud • Commands • Database • Files • Internal • Inventory • Messaging • Monitoring • Net Infrastructure • Network • Notification • Packaging • Source Control • System • Utilities • Web Infrastructure • Windows
25. Modules • Cloud (DO, AWS, Azure, GCE, Docker) • DB (Mongo, MySQL, Postgres, Redis, Riak) • Messaging (RabbitMQ) • Monitoring (Zabbix, Monit, Nagios, New Relic…) • Web (apache, supervisord…) • Docker • Vagrant • …
26. Notification Modules • flowdock • hipchat • irc • jabber • slac • sns • twilio • …
27. Cron module # Ensure a job that runs at 2 and 5 exists. # Creates an entry like "* 5,2 * * ls -alh > /dev/null" - cron: name="check dirs" hour="5,2" job="ls -alh > /dev/null" # Ensure an old job is no longer present. Removes any job that is prefixed # by "#Ansible: an old job" from the crontab - cron: name="an old job" state=absent # Creates an entry like "@reboot /some/job.sh" - cron: name="a job for reboot" special_time=reboot job="/some/job.sh" # Creates a cron file under /etc/cron.d - cron: name="yum autoupdate" weekday="2" minute=0 hour=12 user="root" job="YUMINTERACTIVE=0 /usr/sbin/yum-autoupdate" cron_file=ansible_yum-autoupdate # Removes a cron file from under /etc/cron.d
28. http://docs.ansible.com/guide_vagrant.html
29. Roles • YAML • Documentation • Modules (task) • Ansible Galaxy
30. Tasks (main.yml)
31. Templates • Templates are processed by the Jinja2 templating language (http://jinja.pocoo.org/docs/dev/templates/) • Powerful conditionals • Loops and iterators
32. Example templates • Apache VirtualHost configuration file • HAProxy configuration • …
33. Rollback? • http://www.servermanaged.it/ansible/ansible-simple- rollback-strategy/ • http://www.future500.nl/articles/2014/07/thoughts- on-deploying-with-ansible/
34. Resources • http://docs.ansible.com/ • http://docs.ansible.com/ playbooks_best_practices.html • https://galaxy.ansible.com/ • https://github.com/ansible/ansible-examples • https://github.com/leucos/ansible-tuto
35. Books
37. Real world app 1 app 2 app 3 DB - master DB - slave RabbitMQ Redis app 4 storage transcoder logs monitoring
39. Questions? • Igor Brovchenko • @tigordev • igor.Brovchenko@gmail.com • http://ua.linkedin.com/in/IgorBrovchenko