Managing Databases In A DevOps Environment 2016
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Given at #pgdayphilly2016, this talk covers how configuration management, monitoring, and rapid deployments are impacting how we think about database management.
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Managing Databases In A DevOps Environment 2016
- 1. / Robert Treat Managing Databases in a {DEVOPS} Environment
- 3. OmniTI Who Am I? “we offer a full suite of operational, database, and development services. whether you need help with an existing architecture, are looking to build out a new service, or just need a second opinion, we would love to help”
- 4. Who Am I? Highly Scaled Big Data Heavy Transactions
- 5. What Is “DevOps” ?
- 6. putting your development in my ops
- 7. putting your ops in my development
- 8. mindmeld
- 9. not a talk about devops per se
- 10. let’s focus on three things
- 12. monitoring
- 14. yes, I just offended everyone with a “kanban” t-shirt
- 15. moving on
- 17. some sysadmins get very excited about systems automation
- 19. *yawns*
- 20. many DBA’s have like ONE BOX to manage
- 22. this makes server automation seem like a hassle
- 23. now you have two problems
- 24. even with one box, there are many things to configure
- 25. database configs, cron jobs, packages, monitoring, scripts, binaries, shell config, pooler?
- 27. it’s a lot to configure
- 28. and it needs to be documented, or at least reproducible
- 29. and it would be nice to know when changes occur within your environment
- 30. these tools can help you with that
- 34. track changes
- 36. also consider
- 38. is probably more than just one database
- 39. webservers data loading script load balancer primary replay node B writes writes reads reads writes replay node A a1 a2 a3 b1 b2 b3
- 40. failover, reporting, staging, development, read replicas, and more!
- 41. and then someone sets up a new service
- 42. now you have to configure everything again on multiple machines
- 43. how long does it take you to stand up a new copy of your database?
- 44. how confident are you that everything has been configured correctly?
- 47. system stuff
- 48. disk i/o, disk space, cpu, network traffic, load
- 49. database stuff
- 52. transactions per second, connections, index scans, seq scans, table size
- 53. transactions per second, connections, index scans, seq scans, table size, cache hit ratios
- 54. don’t get hung up on details
- 55. DBA’s are sometimes finicky about data quality
- 56. it is better to have useful metrics than to have accurate metrics
- 57. metrics enable capacity planning
- 59. metrics let you know what good looks like
- 62. why did my site break?
- 63. changes
- 64. configuration parameters code pushes traffic spikes
- 65. make it easy to correlate changes
- 66. expose this to everyone!
- 67. dba’s, devs, sa’s, finance, marketing, everyone!
- 71. a bazillion deploys a day!
- 72. from idea to code in the blink of an eye
- 74. this doesn’t work well for databases
- 75. databases are fundamentally different
- 76. they have data
- 78. and hard to replace
- 79. you can always rewrite your code
- 81. you can’t get everyone to give you their data again
- 82. cf.
- 83. furthermore
- 84. code is static
- 88. data is often dynamic
- 89. control is in the hands of users
- 90. this makes database administration more difficult
- 91. we cannot eliminate change
- 92. we need to manage change
- 93. ideally, we want to enable change
- 94. back in the day
- 95. DBA’s lived in walled gardens
- 97. you send them requirements
- 99. they send you a schema
- 101. send them updated requirements
- 103. different schema
- 104. this goes back and forth
- 106. dev keeps pushing just to get it done
- 107. dba pushing to minimize change
- 108. in order to minimize risk
- 109. eventually something is agreed upon
- 110. but this takes a long time
- 111. forget you!
- 113. many shops bypass dba’s
- 114. where bypass means “don’t have”
- 115. but you still need someone to make it work
- 116. you need balance
- 118. devs design schema
- 119. BLASPHEMY!
- 120. (devs) meet with project managers
- 122. (devs) understand the app
- 123. confer with dba’s if you have questions!
- 124. if you had a {perl|php|ruby|python|javascript} python question, you would ask a senior dev
- 125. dba’s are your senior devs wrt databases
- 126. have a style guide for schema design
- 127. schema changes become migrations
- 128. new stuff, changed stuff
- 129. all migrations must be reviewed
- 130. look for red flags
- 131. nulls, indexes, datatypes, constraints
- 132. what’s the impact?
- 133. locking, data rewrites, other stuff that sucks
- 134. 1000 Pushes A Day?
- 135. No
- 136. remember locking?
- 137. you have peak times
- 138. build schema change windows around off-peak hours
- 139. once a week
- 140. once a day
- 141. just not during lunch
- 142. you can’t eliminate risk
- 143. minimize the unnecessary risk
- 144. and it’s worth pointing out
- 145. schema changes should not be married to code changes
- 146. if your feature launches next week, push the schema changes this week
- 147. add columns well in advance of writing to them
- 148. stop writing to columns well before dropping them
- 149. like development, it is easier to digest small, incremental changes
- 150. devops has changed the way we think
- 151. dba’s are the original devops
- 152. it’s time we all got on the same team