12 Factor App - Speaker Deck

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The principles for SaaS apps THE TWELVE-FACTOR APP Erkan Erol Apprentice Software Craftsman http://bit.ly/erkanerol-12factor

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Erkan Erol Apprentice Software Craftsman erkan_erol_ erkanerol erkanerol.github.io Software Developer @ SAP Development Center Turkey Co-Organizer @ Software Craftsmanship Turkey Java k8s Linux Web

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Disclosure

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http://www.oreilly.com/webops-perf/free/beyond-the-twelve-factor-app.csp

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http://www.flaticon.com/

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manifesto describing the rules and guidelines that needed to be followed to build a cloud-native application 2012

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What is the target?

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minimize time and cost for new developers joining the project declarative formats for setup automation

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offering maximum portability between execution environments have a clean contract with the underlying operating system

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obviating the need for servers and systems administration are suitable for deployment on modern cloud platforms

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enabling continuous deployment for maximum agility minimize divergence between development and production

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scale up without significant changes to tooling, architecture, or development practices

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any language

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any backing services

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TWELVE FACTORS

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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ONE APP ONE REPO

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USELESS

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DISTRIBUTED SYSTEM

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No content

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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never relies on implicit existence of system-wide packages

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explicitly declare

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isolate dependencies

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Ansible Playbook

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pom.xml

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Mommy Server Bootstrapped

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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DEV QA PROD what varies between deploys?

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Code Configuration Credentials

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treat your apps like open source

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externalize your configuration Consul ZooKeeper Config Server

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protect credentials

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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No content

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the filesystem must be considered ephemeral

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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BUILD ✓ Complex processes ✓ Deterministic ✓ Central Build ❌ Configuration ❌ Environment specific ❌ Local Build

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+ ✓ Versioning ✓ Configuration ✓ Deploying different environments ✓ Ready to run ✓ Storing releases ❌ Changing executables RELEASE

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✓ Simple ✓ At any time ❌ Live code fixes ❌ Live config changes RUN

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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stateless

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externalize states

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share nothing

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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8080 /app1 /app2 /app3 8080 8081 8082 exports service by binding to a port

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everything is a file everything is accessed via its port

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Scaling is the root cause of all evil Scaling is bliss Something is wrong

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Scaling is bliss

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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use and throw

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short startup time

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graceful shutdown

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sensitive to signals

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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TIME GAP

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PERSONAL GAP

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DEV PROD TOOL GAP

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Logs Are Streams, Not Files

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♥stdout♥

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● Finding specific events in the past. ● Large-scale graphing of trends ● Active alerting according to user-defined heuristics

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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use tool for migrations

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Codebase Dependencies Config Backing Services Build, Release, Run Processes Port Binding Concurrency Logs Dev/Prod Parity Disposability Admin Processes

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Thank you for listening...