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Deploy like nobody is watching
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bascht
March 11, 2015
Technology
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Deploy like nobody is watching
Re-Run of my »Deployment« Talk for RubyShift Munich.
bascht
March 11, 2015
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Transcript
Deploy like nobody is watching. March 11th, 2015 @bascht
Ye olde DevOps
None
Silos
Distribution of roles
Creative Commons Attribution 4.0 International (http://commons.wikimedia.org/wiki/File:The_Devil_and_Dr._Faustus_meet._Wellcome_L0031469.jpg)
…the »old world« software developer…
…the »old world« system administrator…
So – let's swap roles. (Can't be that hard, no?)
* { /* No idea what I'm cascading here… */
color: 'Kornblumenblau' !important; }
$$('I'){ $('will#wrap').each(function('until'){ return this.self._self.that['crap'].works; }); };;;; // eat ._this, jslint!
$ sudo sudo su -c "sudo do --what 'I want'"
Small castles CC BY-NC-ND 2.0 — Jos van Wunnik
Galileo Galilei - 1636
nginx::resource::upstream { 'here_be_dragons': members => [ 'lolcathost:8080', 'lolcathost:8081', 'lolcathost:8082', ],
} nginx::resource::vhost { 'app.yournextstartup.com': proxy => 'http://here_be_dragons', }
Tools ansiblebcfg2cdistchefcfengineisconfjujulcfg ocsinventoryngwithglpiopsipikt puppetquattorradmindrex rundecksmartfrogsaltspacewalk
docker docker docker docker docker docker docker docker docker docker
docker docker docker docker
Being responsible for the artefact that is shipped. Every step
of the pipeline.
None
MANAGEMENT = :mediocre CUSTOMER = :opinionated def my_little_farm(requirements) engineering =
:truly_optimistic trap("SIGINT") { ignore_those_admins } pray_for(some.kind_of? Wonder) ship! end
Releases.
Imagine… …it's friday.
Your deployment plan… …doesn't scale very well.
gut metrics Who truly understands every base / helper /
tools / domain class? Who understands your deployment process?
busnumber
Why not… deploy as often as possible? let the new
employee deploy on her first day? deploy when nobody is watching?
2015 Infrastructure code is code as well!
Are your problems bubbling up… …from app code? …from your
server configuration? …during rollout? …because of poor orchestration?
© 2013 — theprofoundprogrammer.com
No more excuses. Infrastructure problem? File an issue Infrastructure change?
Hand in a story App Changes need infrastructure changes? Orchestrate your rollouts.
No commit without an issue id / feature branch. No
major release without documentation in an issue.
Do code reviews. Yes. for infrastructure. Yes. Even for infrastructure.
Sorry, but there is no one-size-fits-all solution. Quelle: GFDL image
by user Fanghong. Creative Commons Attribution-Share Alike 3.0 Unported
Well, turns out there is.
Documentation (imagine rolling thunder)
CLI > Code > Wiki $ bin/deploy --wat?
Actually use your Wiki! New employees? Old hostnames? Cross references!
Macros? Copy / Paste commands?
Your toolchain? in version control useful names well documented self-explanatory
independent from the environment
Use some nice wrapping.
#!/bin/(da|ba)sh #nope
#!/usr/bin/env ruby
--Chet Ramey “ ... there are dark corners in the
Bourne shell, and people use all of them. ”
Build for the worst. Do your error pages cover every
layer? Will every layer fail gracefully? Can you roll back? Should you roll back? Can you deactivate features? Can you afford to deliver stale content?
restore > backup
employee of the month
Updating artefacts isn't the last step!
Monitor every deployment. Gather health checks.
Steal good ideas! $ curl -XGET 'lolcathost:9200/_cluster/health?pretty=true' { "cluster_name" :
"prism_europe", "status" : "green", "timed_out" : false, "number_of_nodes" : 242, "number_of_data_nerds" : 242 "active_primary_shards" : 50, "active_shards" : 100, "people_actually_reading_this_slide": 1, "relocating_shards" : 0, "initializing_shards" : 0 }
Use obvious tools. var casper = require('casper').create(); var baseurl =
casper.cli.get("baseurl") || 'http://bascht.com'; casper.start(baseurl, function() { this.capture('shots/homepage.png'); this.test.assertTitle('bascht.com'); this.test.assertExists('input[action$="/search"]', 'Yay!'); this.clickLabel('Blog', 'a'); });
— Timothy Fitz (IMVU) “Treat staging failures like as if
they were production failures.”
We're almost done.
-- Robert A. Heinlein “Specialization is for insects.”
See how things work out. # ~/.bash_login rm ~/.bash_history &&
sync; echo "They never fail who die, In a great cause! Lord Byron"; echo "Welcome to $(hostname).";
Sebastian Schulze (@bascht / @bscht) , 29.years Software- & infrastructure
developer Vogtland, Leipzig, Köln, Berlin, Munich Thank you! Twitter / Github / ADN: @bascht