Deployment within a traditional IT environment

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Deployment Within a Traditional IT environment Rob Allen akrabat.com ~ @akrabat ~ November 2016

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What? Software deployment is all of the activities that make a software system available for use. Wikipedia Rob Allen ~ @akrabat

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Traditional IT environment Rob Allen ~ @akrabat

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Not in this talk • Cloud deployments • Provisioning of servers • Continuous Delivery • Chat Ops Rob Allen ~ @akrabat

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Fundamentals Rob Allen ~ @akrabat

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Development processes Rob Allen ~ @akrabat

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Code organisation • Isolate work • Work on branches • Always have a way to bugfix live Rob Allen ~ @akrabat

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Feature branches Rob Allen ~ @akrabat

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Git flow Rob Allen ~ @akrabat

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Automatic testing Automatically test every PR • Coding style • Unit tests • Functional tests • Acceptance tests Rob Allen ~ @akrabat

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DB schema management Rob Allen ~ @akrabat

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Migrations • Schema changes stored in individual files • delta files with UP and DOWN functionality • It really doesn't matter which tool you use Rob Allen ~ @akrabat

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Configuration data Rob Allen ~ @akrabat

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Context awareness Each instance needs different configuration • Environment variables (12factor.net/config) • Local configuration file Rob Allen ~ @akrabat

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Deployment Rob Allen ~ @akrabat

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Manual deployment Simply copy the files to the right place (S)FTP / rsync / Remote Desktop Rob Allen ~ @akrabat

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Manual deployment • Slow • Inconsistencies between each deploy • Failures in production • No records. Who deployed what, when (or where)? Rob Allen ~ @akrabat

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It's more than just code Rob Allen ~ @akrabat

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Other things to think about • File permissions • Preserve user uploaded files • After upload • Stale cache? • Cache priming? • Keeping records Rob Allen ~ @akrabat

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People aren't machines! Rob Allen ~ @akrabat

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Automation People: good at creative judgement Machines: good at doing the same thing over and over Rob Allen ~ @akrabat

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Benefits • Deferred deployments • Self-service deployments • Automatically triggered deployments • Smoke tests • Automatic rollbacks Rob Allen ~ @akrabat

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Scripts • Provide consistency • Provide a platform for additional abilities • No need to wait for other people • Faster and less hassle. Rob Allen ~ @akrabat

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Deployment checklist • Copy files & folders • Database schema & content updates • Configuration updates • File permissions • Clear caches Rob Allen ~ @akrabat

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Tooling • Simple script • Make-like tool • Specialist tool Rob Allen ~ @akrabat

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Simple script • Bash • Powershell • Usually runs on the server Rob Allen ~ @akrabat

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Make-like tool • Abstracted script • Easier to make cross platform • Make/Phing/Ant/Rake • More likely to push to server Rob Allen ~ @akrabat

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Specialist tools • Fabric/Capistrano • Ansible/Chef/Puppet/Salt • Deploybot • More likely to be automated Rob Allen ~ @akrabat

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Challenges Rob Allen ~ @akrabat

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Technical Infrastructure challenges • Platform • Permissions Rob Allen ~ @akrabat

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Political • What is acceptable? • What are you allowed to do? • Does IT change things for you? • Does IT change things unexpectedly? • Change request documentation? Rob Allen ~ @akrabat

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Case studies Rob Allen ~ @akrabat

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Case study 1: Internal • Self-hosted by client • Within company network • Windows/IIS/SQL Server Rob Allen ~ @akrabat

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Case study 1: Internal Multi-script solution 1. Script to tag code & build tarball 2. Ship tarball to UAT server via VPN 3. IT copy tarball from UAT to Live 4. Script to untar & run deploy steps Rob Allen ~ @akrabat

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Case study 2: Minicomputer • Self-hosted by client • Some access to Internet • IBM i-series/DB2 Rob Allen ~ @akrabat

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Case study 2: Minicomputer • CI tooling • Checklist • Manual tag creation for release • Automatic script to deploy Rob Allen ~ @akrabat