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We’re headed back to the Twelve-Factor app territory and this time we’re picking up with the next three chapters – backing services, building and releasing and processes. Jump in to get the shownotes and listen to the next three pieces of building a manageable and scalable twelve-factor app.
Survey
News
Mark Tinsley – PHP Composer – thanks for the tip!
https://getcomposer.org/
Joe made a game in Javascript (using dozens of libraries):
Box Pusher! (game name of the year)
https://github.com/THEjoezack/BoxPusher
Allen’s cry for writing black-boxed, encapsulated code…
Episode on Encapsulation: http://www.codingblocks.net/episode23
Episode on SOLID Design: http://www.codingblocks.net/episode7
Probably want to listen to the first three parts of the 12 Factor App if you missed it:
http://www.codingblocks.net/episode32
IV. Backing Services
- Any resource consumed over the network: databases, mail servers, cloud services, etc.
- Anything external to your app (but could be local to your environment)
- Should not have to change any code to redeploy – should be config changes if anything
- Clearly Tech – Importance Rating: High
We’ve mentioned Splunk, and if you’re not familiar, it’s an enterprise piece of software that will aggregate logs from multiple sources (servers, computers, etc):
http://www.splunk.com/en_us/products/splunk-enterprise.html
Bug in Visual Studio that cost one person $6,500 in a few hours:
V. Build, Release, Run
- Build stage – transform which converts the code repo into an executable bundle
- Release stage – combines the build with the required config and deposits it somewhere
- Run – runs the app in the execution environment (development, staging, production, other)
- Rolling back may be more complicated when you start talking about database schemas / data changes
- Clearly Tech – Importance Rating: Conceptual???
Version numbers? What do you prefer? Version numbers with major and minor revisions? Or do you prefer timestamps?
VI. Processes
- Stateless and Share Nothing
- No local session
- Make sure saving files go to an available repository
- Clearly Tech – Importance Rating: High (Joe wants higher than high)
Share Nothing Architecture
https://en.wikipedia.org/wiki/Shared_nothing_architecture
Resources We Like
- http://www.12factor.net
- http://www.clearlytech.com/2014/01/04/12-factor-apps-plain-english/
- http://devcenter.heroku.com/articles/architecting-apps
Tips
Allen: Find problematic queries that are killing your SQL Server…replace 123 with the spid from sp_who2.
sp_who2 ‘active’
DBCC INPUTBUFFER(123)
If you want to be mean….replace 123 with the spid from sp_who2
KILL 123
Additionally, if there’s high CPU and low I/O, it’s likely either a missing or a fragmented index.
Joe: Tortoise Git
Mike: Tip of the week is the Pseudocode podcast
And…don’t be lazy. We can’t seem to get off our tails and get a business card made!
