Rails meetup deployments tricks
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This document discusses tips for deployments, which can cause downtime and wasted time. It recommends having a staging server to test deployments. Specific tips include deploying without downtime, handling migrations carefully as data size increases, avoiding deleting columns and renaming columns, and using tools like Postgres' CREATE INDEX CONCURRENTLY and Percona Toolkit to add indexes without locking tables. The conclusion is that continuous integration should handle deployments and no-downtime is harder but possible with the right processes.
Rails meetup deployments tricks
- 2. @smathieurainforest Why? Deployments are scary Major cause of downtime Wasted time
- 5. We only deploy 20 times per day
- 9. @smathieurainforest Have a staging server
- 15. @smathieurainforest Migrations Major challenge to get right It gets harder with data
- 18. @smathieurainforest Dont delete columns rename_column :users, :notes, :deprecated_notes _2014_01_01
- 19. @smathieurainforest Adding Indexes Slows on large tables Locks the table
- 21. @smathieurainforest MySQL Percona Toolkit: http://www.percona.com/software/percona-toolkit Facebooks Online Schema Change: https://www.facebook.com/notes/mysql-at- facebook/online-schema-change-for-mysql/ 430801045932
- 25. @smathieurainforest Having a staging server is nice, but
- 26. @smathieurainforest on demand staging is better
- 29. @smathieurainforest Conclusion Your CI should be the only thing deploying your code No-Downtime Deployments are harder, but possible Invest in your deployment processes