The document discusses how to write a scalable Symfony application in the cloud. It covers upgrading points like database connections, file uploads, session storage, local development, and deploying. Database connections should use a master-slave configuration. File uploads can use Amazon S3 for storage. Sessions can be stored in a database. Local development differs from production. Deploying can use SVN update or checkout with symlinking. Automation helps deployment.

1. Symfony in the Cloud
Kris Wallsmith
February 17, 2010
Wednesday, February 17, 2010

2. Kris Wallsmith
• Freelance web developer, • JavaScript (moo)
consultant, training, audits...
• @kriswallsmith
• 10 years using PHP
• CTO of Nebul.us
• 3 years using symfony
• Author of (too) many plugins
• 1 year on symfony core team
Wednesday, February 17, 2010

3. Wednesday, February 17, 2010

4. What is Nebul.us ?
• Nebul.us is a vibrant and visual life aggregator. In real time you can see
what your friends and the public are sharing and discovering online!
• Passively share what you’re doing online
• Show don’t tell
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7. What is Nebul.us really?
• Symfony Framework
• Doctrine ORM
• Zend Framework
• Swift mailer
• and more…
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8. What is Nebul.us really?
• Web site
• XML services (Flash and Atom)
• JSON services (browser plugins)
• Up to 12 requests per minute when browsing
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9. Prototype
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10. Prototype
HTTP
PHP
Local Filesystem
Sessions
Uploads
MySQL
ServerGrove VPS
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11. What is “The Cloud”?
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12. I don’t know.
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13. What is “The Cloud”?
• Adds a (big) black box to your stack
• Several virtualized resources
• Scale based on the level of traffic
• Pay only for what you use
• Elastic!
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14. It’s cloudy out there
• Amazon
• Rackspace
• Microsoft
• Rightscale
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16. Production
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17. Production
HTTP
PHP
Local Filesystem
Sessions
Uploads
MySQL
ServerGrove VPS
Wednesday, February 17, 2010

18. Production
HTTP
PHP
Local Filesystem
Sessions
Uploads
MySQL
ServerGrove VPS
Wednesday, February 17, 2010

19. No really, it’s that easy.
Wednesday, February 17, 2010

20. Writing a scalable
symfony application
Kris Wallsmith
February 17, 2010
Wednesday, February 17, 2010

21. Upgrade Points
• Database connections
• File uploads
• Session storage
• Local development
• Deploying
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22. Database Connections
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23. Database Connections
• Typical database configuration
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26. Database Connections
• One writable “master” connection
• One or more read-only “slave”
connections
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27. Managing Connections
• Organize read and write connections
using a naming convention
• Choose a random read connection
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30. Extend the Doctrine ORM
• Use the appropriate connection
• Doctrine_Query
• Doctrine_Record
• Doctrine_Collection
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34. Configure Doctrine
• Set custom query and collection class
attributes in manager
• Set custom record class in builder
options
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36. Using the Doctrine DBAL
• Doctrine_Manager::connection()
• $table->getConnection()
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39. Using the Doctrine DBAL
• Doctrine_Manager::getInstance()
->getConnection('master')
• $context->getDatabaseManager()
->getDatabase('master')
->getDoctrineConnection()
• $configuration
->getWriteConnection()
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40. How do we test this?
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41. Connection Listener
• Listen to every connection
• Compare type of query to type of
connection
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44. Connection Listener
• Add connection listener to debug
mode and test suite
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46. Multiple Connections
• Configure multiple connections to the
same database
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48. Do you want it?
Introducing sfDoctrineMasterSlavePlugin
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49. File Uploads
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50. File Uploads
• Typical upload form
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53. View Layer
• Render the uploaded image
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55. Amazon S3 Integration
• Must handle file uploads
• Must integrate with the view layer
• Must be disable-able
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56. Stream Wrapper
• Zend Amazon S3 stream wrapper
• s3://mybucket/image.jpg
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58. Read / write paths
• Configure read and write upload
paths
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60. Configure Amazon S3
• Toggle integration on/off
• Environment buckets
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62. Configure File Uploads
• Upload to the write directory
• Custom validated file class
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65. Amazon S3 ACL
• ACL defaults to private
• Extend and change to public-read
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66. t, ...
ss ew
Ps th
M at
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69. View Layer
• Nothing magic
• Custom helper function that uses the
configured upload read path
• Search and replace…
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73. Session Storage
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74. Session Storage
• Default factories configuration
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77. Session Storage
• Store session data in the database
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78. Database Session Storage
• Migrate the database
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80. Local Development
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81. Local Development
• One database
• Save uploads to the local filesystem
• Present correct upload path in view layer
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82. Deploying
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83. Deploying
• Subversion
• svn update
• svn checkout + symlink
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84. Deploy with svn update
1. Disable
2. Update the working copy
3. Rebuild model files
4. Migrate the database
5. Enable
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85. Deploy with svn checkout
1. Checkout a fresh working copy
2. Setup files not in the repository
3. Build model files
4. Disable current working copy
5. Migrate the database
6. Update symlink
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86. Deploy with svn update
1. Disable
2. Update the working copy
3. Build model files
4. Migrate the database
5. Enable
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87. Deploy with svn checkout
1. Checkout a fresh working copy
2. Setup files not in the repository
3. Build model files
4. Disable current working copy
5. Migrate the database
6. Symlink the new working copy
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88. Deployment Strategies
• svn update
• fewer steps
• svn checkout + symlink
• less downtime
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89. Automated Deployment
• Rightscale API
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92. Questions?
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