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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>reveal.js</title>
<link rel="stylesheet" href="dist/reset.css">
<link rel="stylesheet" href="dist/reveal.css">
<link rel="stylesheet" href="dist/theme/si.css">
<!-- Theme used for syntax highlighted code -->
<link rel="stylesheet" href="plugin/highlight/monokai.css">
</head>
<body>
<div class="reveal">
<div class="slides">
<section data-background-image="assets/route1.jpg" data-background-opacity="0.2">
<h1>What if Infrastructure as Code never existed?</h1>
<h2>Adam Jacob, CEO, System Initiative</h2>
<small>([email protected], @adamhjk, @[email protected])</small>
<aside class="notes">
<ul>
<li>Wrote a thing called Chef</li>
<li>CEO of System Initiative</li>
<li>I didn't come up with this talk title</li>
<li>Paul Stack did</li>
<li>But then I had to figure out how to live up to the title</li>
<li>And to explain how I did that, I have to tell you a story</li>
</ul>
</aside>
</section>
<section data-background-image="assets/route1.jpg" data-background-opacity="0.2">
<h1 class="r-fit-text">30 Years</h1>
<aside class="notes">
<ul>
<li>First job in tech was ISP<li>
<li>Dentists office 15</li>
<li>BSDI servers</li>
<li>BBSes since I was 8</li>
<li>Sysadmin was cool</li>
<li>Now 45</li>
<li>Saw web 1, the internet, web 2, dot bomb, started chef, velocity, devops</li>
<li>Saw a lot happen</li>
</ul>
</aside>
</section>
<section data-background-image="assets/route1.jpg" data-background-opacity="0.2">
<h1 class="r-fit-text">22</h1>
<aside class="notes">
<ul>
<li>22 years ago, different internet company</li>
<li>Just moved to Seattle</li>
<li>Just discovered alcohol</li>
<li>Really quite drunk</li>
</ul>
</aside>
</section>
<section data-background-image="assets/pager.jpg" data-background-size="cover">
<aside class="notes">
<ul>
<li>This thing goes off</li>
<li>How many of you had one of these?</li>
<li>Roll myself out of bed</li>
<li>Call my boss back on a land line, because thats what we had then</li>
</ul>
</aside>
</section>
<section data-background-image="assets/john_boyd.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Important note is my boss was a retired marine corps colonel</li>
<li>not this guy, who knows who this is?</li>
<li>the ooda loop guy</li>
<li>he's in a panic</li>
<li>sites down, fix it right now</li>
</ul>
</aside>
</section>
<section data-background-image="assets/drunk.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Full drill sargent</li>
<li>soldier, get out of bed, 15 minutes, fix that server</li>
<li>sober up</li>
</ul>
</aside>
</section>
<section data-background-image="assets/suburban.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Shows up at my apartment in one of these</li>
<li>pops out of the car</li>
<li>hands me a cup of coffee</li>
<li>marine corps pep, piles me into his car</li>
<li>hauls ass to the data center</li>
</ul>
</aside>
</section>
<section data-background-image="assets/datacenter.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>grab a crash cart</li>
<li>plug in to the servers</li>
<li>gives me a full on pep talk</li>
<li>going to fix the servers, marches me through it</li>
<li>we're not gonna die here</li>
<li>I fix the servers</li>
<li>great job, nobody died here, lets get breakfast</li>
<li>shakes my hand, says I did a good job, drops me off</li>
</ul>
</aside>
</section>
<section data-background-image="assets/crisis.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- From Flickr, used by CC: https://flic.kr/p/e3919p -->
<h1 class="r-fit-text">Crisitunities</h1>
<ul>
<li>Internet for everyone!</li>
<li>Content on the Internet!</li>
<li>Build applications on the internet!</li>
<li>Social Media!</li>
<li>Digital Transformation!</li>
</ul>
<aside class="notes">
<ul>
<li>And that, pretty much, is what the last 30 years was like</li>
<li>for everyone!</li>
<li>over and over again for 30 years</li>
<li>some version of that colonel begging us to figure it out<li>
</ul>
</aside>
</section>
<section data-background-image="assets/creative-act.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>It was a very creative time</li>
<li>Not just for me, for everyone</li>
<li>Like musicians swept up in a cultural movement, we just made it up as we went along</li>
</ul>
</aside>
</section>
<section data-background-image="assets/rules.jpg" data-background-size="cover" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/2goppRx -->
<h1 class="r-fit-text">Rules</h1>
<aside class="notes">
<ul>
<li>When we started, there were no rules</li>
<li>The few books on sysadmin gave bad advice!</li>
<li>loaded with lies - plug a printer in to the server to print syslog for hard copy in case you get hacked</li>
<li>I did - we came in the next day room full of paper</li>
<li>Rule after Rule, we made them up<li>
</ul>
</aside>
</section>
<section data-background-image="assets/nature.jpg" data-background-size="cover" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/2euif8o -->
<h1 class="r-fit-text">Laws of Nature</h1>
<aside class="notes">
<ul>
<li>30 years in, you accept those rules like laws of nature</li>
<li>Well of course we do it that way, its the only way it could've worked.<li>
<li>I assure you, they are not; at best, guiding priciples</li>
<li>Maybe creative criteria - the box in which you can create</li>
</ul>
</aside>
</section>
<section data-background-image="assets/rules.jpg" data-background-size="cover" data-background-opacity="0.2">
<blockquote><q>Rules direct us to <span class="orange">average behaviors</span>. If we're aiming to create works
that are exceptional, most rules don't apply. <span class="green">Average is nothing to aspire to</span>.</q></blockquote>
<small> -- Rick Rubin, The Creative Act, Page 98</small>
<aside class="notes">
<ul>
<li>And that is why Paul Stack wrote an incredible talk title<li>
</ul>
</aside>
</section>
<section data-background-image="assets/break-rules.jpg" data-background-size="contain">
<!-- From flickr: https://flic.kr/p/2nx7c7Z -->
<aside class="notes">
<ul>
<li>Because it's an invitation to break the rules</li>
<li>An invitation to explore and create</li>
<li>as a movement we're stuck in a rut, playing our own greatest hits</li>
<li>why I left chef</li>
<li>playing myself on tv</li>
<li>small variations on the theme for the same essential outcomes</li>
<li>average; its boring.</li>
<li>so that's what we're going to do - break some rules</li>
</ul>
</aside>
</section>
<section id="choose" data-background-image="assets/judas.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>Break a rule!</h1>
<table>
<tr>
<td colspan=2>
-----> <a href="#/configuration-as-code">Configuration as Code</a> <-----
</td>
</tr>
<tr>
<td><center><a href="#/source-control">Source Control</a></center></td>
<td><center><a href="#/declarative">Declarative</a></center></td>
</tr>
<tr>
<td><center><a href="#/variables">Variables</a></center></td>
<td><center><a href="#/testing">Testing</a></center></td>
</tr>
<tr>
<td colspan=2><center><a href="#/truth">Single Source of Truth</a></center></td>
</tr>
<tr>
<td colspan=2><center><small><a href="#/wrap-up">Wrap up!</a></small></center></td>
</tr>
</table>
<aside class="notes">
<ul>
<li>You shout out which rule you want me to break</li>
<li>Then I will break it, and we will do it again</li>
<li>Won't be able to break them all before the end</li>
<li>Which rule do you want to break</li>
</ul>
</aside>
</section>
<!-- Begin Configuration As Code -->
<section id="configuration-as-code" data-background-image="assets/config.jpg" data-background-size="cover" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/DqoFyV -->
<h1>Configuration as Code</h1>
<aside class="notes">
<ul>
<li>Very thoughtful of you</li>
<li>Have to break this rule first</li>
<li>Nearly impossible to imagine breaking the others</li>
<li>Everything we do stems from this one historical decision</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>sendmail.cf</h1>
<pre>
<code>
Mlocal, P=/usr/bin/procmail,
F=lsDFMAw5:/|@ShP, S=10/30,
R=20/40, T=DNS/RFC822/X-Unix,
A=procmail -a $h -d $u
Mprog, P=/bin/sh, F=lsDFMoeu, S=10/30,
R=20/40, D=$z:/,
T=X-Unix, A=sh -c $u
Msmtp, P=[IPC], F=mDFMuX, S=11/31, R=21,
E=\r\n, L=990,
T=DNs/RFC822/SMTP, A=IPC $h
</code>
</pre>
<aside class="notes">
<ul>
<li>Original configuraiton syntax for sendmail</li>
<li>First one was written 41 years ago</li>
<li>Who wrote one of these by hand</li>
<li>Most straightforword I could find; rewrite rules were line noise</li>
<li>So 31 years ago they switched to this</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>sendmail.mc</h1>
<pre>
<code>
include('../m4/cf.m4')
OSTYPE(unknown)
FEATURE(always_add_domain)
define(`UUCP_RELAY`, `smtp:uunet.uu.net`)
define(`LUSER_RELAY`, `smtp:indiana.edu`)
MAILER(local)
MAILER(smtp)
</code>
</pre>
<aside class="notes">
<ul>
<li>Used the m4 macro pre-processing language</li>
<li>to generate the sendmail.cf file - 31 years ago</li>
<li>Some had sendmail mc - but we had a few years to go</li>
<li>So much easier, so much more dynamic</li>
<li>First time I wrote code for configuation - program that generated the config file</li>
<li>Helm is sendmail.mc for your yaml</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>Terraform</h1>
<pre>
<code>
resource "aws_instance" "whiskers" {
ami = "ami-0bde60638be9bb870"
instance_type = "t3.micro"
subnet_id = "subnet-07d580fee7a806230"
vpc_security_group_ids =
[aws_security_group.a.id]
key_name = "si_key"
associate_public_ip_address = true
}
</code>
</pre>
<aside class="notes">
<ul>
<li>A direct line from sendmail.mc to terraform</li>
<li>its really complicated to make all the api calls</li>
<li>so we wrote a little language, a macro preprocessor if you will</li>
<li>that took in the high level description and then generated the config</li>
<li>changed the syntax, gained some power, changed the domain</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config-as-code-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Someone writes code</li>
<li>ships it to an interpreter</li>
<li>interpreter reads it in, does some junk</li>
<li>then does some stuff to the world - AWS for terraform, pulumi, cdk</li>
<li>store some intermediate state somehow - so we can come back to it later</li>
</ul>
</aside>
</section>
<section data-background-image="assets/good.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/psmEPb -->
<h1>What's Good</h1>
<ul>
<li>Flexible</li>
<li>Less verbose</li>
<li>Sometimes refactorable</li>
<li>Can abstract anything</li>
</ul>
<aside class="notes">
<ul>
<li>flexible - say anything you want</li>
<li>usually less verbose</li>
<li>sometimes you can refactor - refactoring terraform is not fun</li>
<li>didn't like refactoring puppet either - that's why I wrote chef</li>
<li>can abstract whatever it is</li>
</ul>
</aside>
</section>
<section data-background-image="assets/sucks.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/7zfzWz -->
<h1>What Sucks</h1>
<ul>
<li>Static</li>
<li>Unidirectional</li>
<li>Abstract</li>
<li>No behavior</li>
<li>No relationships</li>
</ul>
<aside class="notes">
<ul>
<li>It's static - you write it, not a lot you can do with it</li>
<li>unidirectional - all the arrows go one way - one way flow</li>
<li>abstract - good and bad. great until you don't have a macro for what you need</li>
<li>no bheavior - you can't ask your code to do things, to change itself</li>
<li>only relationships it understands are code relationships</li>
<li>So what would be better?</li>
</ul>
</aside>
</section>
<section data-background-image="assets/ideas.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/aqn7Ay -->
<h1>Infrastructure as Model</h1>
<ul>
<li>Actors</li>
<li>State and Mutations</li>
<li>Message Passing</li>
<li>Behaviors</li>
<li>Relationships</li>
</ul>
<aside class="notes">
<ul>
<li>What if they were actors, not code (elixir, erlang)</li>
<li>Store state, take mutations</li>
<li>trigger behaviors - start, stop, update your list of tags</li>
<li>Relationships between actors - this one requires that</li>
<li>Pass a message to another actor when you change</li>
<li>That would change the world like this</li>
</ul>
</aside>
</section>
<section data-background-image="assets/infra-as-model-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Person can interact with a representation of the model</li>
<li>Code or UI or whatever</li>
<li>Making a call to a persistent runtime<li>
<li>syncs model to your inputs over a message</li>
<li>aware of relationships, different actors</li>
<li>model could be responsible for syncronizing itself</li>
</ul>
</aside>
</section>
<section data-background-image="assets/benefits.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/an31au -->
<h1>Benefits</h1>
<ul>
<li>Many representations, including code</li>
<li>Relationship aware</li>
<li>Easily encapsulate runtime behavior</li>
<li>No more state management </li>
<li>Bidirectional data flow</li>
<li>Easier to model; it's 1:1 (real world is model)</li>
</ul>
<aside class="notes">
<ul>
<li>Code could be one of many representations</li>
<li>So much of what we do is describe relationships</li>
<li>You can now ask your actor to do things for you</li>
<li>STate management is removed; nobody loves it anyway</li>
<li>Bidirectional data flow - the actor handles transitions, drive it from anywhere</li>
<li>Easier to model, because we aren't modeling an abstraction - no mapping domain to language</li>
<li>Just roll up the behavior of the real world</li>
</ul>
</aside>
</section>
<!-- End Configuration as Code -->
<section data-background-image="assets/again.jpg" data-background-size="contain" data-background-opacity="0.4">
<!-- from flickr: https://flic.kr/p/u5THCv -->
<h1><a href="#/choose">Choose Again</a></h1>
</section>
<!-- Begin Change Sets -->
<section id="source-control" data-background-image="assets/control.jpg" data-background-size="contain" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/79gMin -->
<h1>Source Control</h1>
</section>
<section data-background-image="assets/control.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>RCS</h1>
<h1>CVS</h1>
<aside class="notes">
<ul>
<li>RCS was my first source control system - 41 years ago</li>
<li>RCS individual files</li>
<li>CVS neworked version of RCS, multiple files in one commit</li>
<li>RCS for config, CVS for app code</li>
</ul>
</aside>
</section>
<section data-background-image="assets/control.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Git</h1>
<aside class="notes">
<ul>
<li>Most of you have probably only used Git</li>
<li>Which works quite similarly</li>
<li>Except we distributed it; and then we centralized it again</li>
<li>In many ways the UX took a step backwards</li>
</ul>
</aside>
</section>
<section data-background-image="assets/source-control-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>A person writes some code</li>
<li>Checks it in to source control</li>
<li>Other people can check it out</li>
<li>Essentially unchanged since RCS</li>
</ul>
</aside>
</section>
<section data-background-image="assets/good.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What's Good</h1>
<ul>
<li>Save a copy, revert</li>
<li>History of changes</li>
<li>Diff</li>
<li>Share with others; work in parallel</li>
<li>Branches</li>
<li>Complex capabilities for managing conflict</li>
</ul>
<aside class="notes">
<ul>
<li>Source control is "text"</li>
<li>Rebase</li>
</ul>
</aside>
</section>
<section data-background-image="assets/sucks.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What Sucks</h1>
<ul>
<li>Only good for text</li>
<li>No context about impact; only text delta</li>
<li>No policy</li>
<li>A real pain to automate</li>
<li>Rebasing</li>
</ul>
<aside class="notes">
<ul>
<li>Only the text delta; can't say what will happen</li>
<li>GitOps and policy; many repositories as splitter for policy</li>
<li>Automating source control sucks</li>
</ul>
</aside>
</section>
<section data-background-image="assets/ideas.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Model aware Change Sets</h1>
<ul>
<li>One "HEAD" model</li>
<li>Many hypothetical models</li>
<li>All models aware of the same change set (RCS vs CVS)</li>
<li>Policy embedded in the model</li>
<li>Automatic re-basing</li>
</ul>
<aside class="notes">
<ul>
<li>The model understands it has many hypothetical configurations</li>
<li>Things exist 1:1 in the real world</li>
<li>But we can have lots of them in our head</li>
<li>Embed policy at the model, rather than source</li>
<li>Automatically rebase the model</li>
</ul>
</aside>
</section>
<section data-background-image="assets/change-sets.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Change one part of the model, it might cascade (aware of the context)</li>
<li>Map the relationships; opaque in source code</li>
<li>Lots of change sets is a question of perspective</li>
<li>Like an overlay to the real world</li>
</ul>
</aside>
</section>
<section data-background-image="assets/benefits.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Benefits</h1>
<ul>
<li>Easy to collaborate</li>
<li>Contextual diffs!</li>
<li>Automatic rebasing</li>
<li>Policy is easy to add</li>
<li>Extremely light weight</li>
</ul>
</section>
<!-- End Source Control -->
<section data-background-image="assets/again.jpg" data-background-size="contain" data-background-opacity="0.4">
<h1><a href="#/choose">Choose Again</a></h1>
</section>
<!-- Begin Testing -->
<section id="testing" data-background-image="assets/test.jpg" data-background-size="cover" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/aaawpX -->
<h1>Testing</h1>
</section>
<section data-background-image="assets/juran.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Joseph Juran, wrote Jurans Quality Handbook in 1951</li>
<li>Obsessed with quality generally and specifically</li>
<li>Not just software; quality in general</li>
<li>He defines quality in two ways</li>
</ul>
</aside>
</section>
<section id="testing" data-background-image="assets/test.jpg" data-background-size="cover" data-background-opacity="0.2">
<ol>
<li>Quality means those features of products which <span class="green">meet customer needs </span>
and thereby provide customer satisfaction.</li>
<li>Quality means <span class="orange">freedom from deficiencies</span></li>
</ol >
<aside class="notes">
<ul>
<li>Does the product do what its supposed to do</li>
<li>Is it free from deficiencies</li>
</ul>
</aside>
</section>
<section id="testing" data-background-image="assets/test.jpg" data-background-size="cover" data-background-opacity="0.2">
<h2>Pulumi Unit Test</h2>
<pre>
<code>
it("must have a name tag", function(done) {
pulumi.all([
infra.server.urn,
infra.server.tags
]).apply(([urn, tags]) => {
if (!tags || !tags["Name"]) {
done(new Error(`Missing a name tag on server ${urn}`));
} else {
done();
}
});
});
</code>
</pre>
<aside class="notes">
<ul>
<li>Unit test for pulumi, uses jest</li>
<li>lightly modified for space</li>
<li>Typical of infra as code; not picking on pulumi</li>
<li>Obsessed with how pulumi works</li>
<li>Wait for those variables, then apply them to the function, then check</li>
</ul>
</aside>
</section>
<section data-background-image="assets/good.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What's Good</h1>
<ul>
<li>Catch regressions!</li>
<li>Flexible across different layers</li>
<li>More context aware</li>
<li>Can enforce policy</li>
</ul>
<aside class="notes">
<ul>
<li>If you didn't have a name tag, it would catch it</li>
<li>Gives us back some of that policy</li>
<li>
</ul>
</aside>
</section>
<section data-background-image="assets/sucks.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What Sucks</h1>
<ul>
<li>Slow feedback loops</li>
<li>Mocks and stubs</li>
<li>Not fit for purpose - testing the code, not the world</li>
</ul>
<aside class="notes">
<ul>
<li>Slow feedback loops; takes a while, the more you have, the longer it takes</li>
<li>Mocks and stubs for infra</li>
<li>Testing code makes tons of sense</li>
<li>Testing infrastructure isn't testing the outcomes; impedence mismatch</li>
</ul>
</aside>
</section>
<section data-background-image="assets/ideas.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Build tests into the model</h1>
<ul>
<li>Attach functions to lifecycle events</li>
<li>Validations</li>
<li>Qualifications</li>
<li>Confirmations</li>
<li>Reactive to inputs</li>
</ul>
<aside class="notes">
</aside>
</section>
<section data-background-image="assets/ideas.jpg" data-background-size="contain" data-background-opacity="0.2">
<h2>SI Qualification</h2>
<pre>
<code data-trim data-noescape>
async function dockerImageExists(component: Input) {
const c = await siExec.waitUntilEnd("skopeo", [
"inspect",
`docker://${component.domain.image}`,
]);
return {
result: c.exitCode === 0 ? "success" : "failure",
message: c.exitCode === 0 ? c.stdout : c.stderr,
};
}
</code>
</pre>
<aside class="notes">
<ul>
<li>Simplified qualification from System Initiative</li>
<li>Checks that an image exists in a registry</li>
<li>Reruns every time the image name changes, this runs</li>
<li>Focused on its purpose - not with how the program works</li>
</ul>
</aside>
</section>
<section data-background-image="assets/benefits.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Benefits</h1>
<ul>
<li>Immediate feedback!</li>
<li>Triggered only when needed</li>
<li>Easier to write, because the 'harness' is defined</li>
<li>No need to mock or stub</li>
</ul>
</section>
<!-- End Testing -->
<section data-background-image="assets/again.jpg" data-background-size="contain" data-background-opacity="0.4">
<h1><a href="#/choose">Choose Again</a></h1>
</section>
<!-- Begin Declarative -->
<section id="declarative" data-background-image="assets/declarative.jpg" data-background-size="cover" data-background-opacity="0.2">
<!-- from flickr: https://flic.kr/p/oQXc2V -->
<h1>Declarative</h1>
</section>
<section data-background-image="assets/mark-burgess.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Mark Burgess; handsomest man in devops, round of applause</li>
<li>author of cfgengine, promise theory; we're all standing on his shoulders</li>
<li>25 years ago, configuration should be declarative</li>
<li>round of applause</li>
</ul>
</aside>
</section>
<section data-background-image="assets/declarative.jpg" data-background-size="cover" data-background-opacity="0.2">
<h2>Shell</h2>
<pre>
<code data-trim data-noescape>
#!/bin/bash
OS=`cat /etc/os-release | grep ^ID | cut -d '=' -f 2`
case $OS in
"arch")
pacman -Syu apache
;;
"redhat")
yum install httpd
;;
*)
echo "Unknown OS: $OS"
;;
esac
</code>
</pre>
<aside class="notes">
<ul>
<li>He moved us from scripts that describe how to do something</li>
</ul>
</aside>
</section>
<section data-background-image="assets/declarative.jpg" data-background-size="cover" data-background-opacity="0.2">
<h2>Cfengine 2</h2>
<pre>
<code data-trim data-noescape>
control:
actionsequence = ( packages )
redhat::
httpd action=install
arch::
apache action=install
</code>
</pre>
<aside class="notes">
<ul>
<li>To a declaration that says what should happen</li>
<li>And lets the system figure out how</li>
</ul>
</aside>
</section>
<section data-background-image="assets/declarative.jpg" data-background-size="cover" data-background-opacity="0.2">
<h2>Kubernetes</h2>
<pre>
<code data-trim data-noescape>
spec:
replicas: 3
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80
</code>
</pre>
<aside class="notes">
<ul>
<li>Poster child for being declarative</li>
<li>a snippet of a full k8s deployment manifest</li>
<li>Write our yaml, hand it to k8s, it reconciles</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config-as-code-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Remember this diagram?</li>
<li>This is kubernetes too</li>
<li>We write out code, ship it to k8s to interpret and reconcile</li>
<li>State gets written to etcd</li>
<li>On and on we go</li>
<li>How much and how often we reconcile is different</li>
</ul>
</aside>
</section>
<section data-background-image="assets/good.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What's Good</h1>
<ul>
<li>Declare what you want</li>
<li>Can be significantly less verbose</li>
<li>Easier to deal with failure</li>
<li>Focused on the vocabulary of the domain</li>
</ul>
<aside class="notes">
<ul>
<li>Easier to say you want a chair vs all the steps to build it</li>
<li>Failure happens in the interpreter</li>
</ul>
</aside>
</section>
<section data-background-image="assets/sucks.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What Sucks</h1>
<ul>
<li>Generally 1 state</li>
<li>200% Knowledge Problem</li>
<li>Difficult to extend</li>
<li>Sucks at modeling workflow</li>
<li>Takes as long as it takes</li>
</ul>
<aside class="notes">
<ul>
<li>Only say you want it installed; not installed, then something else, then uninstalled</li>
<li>Knowledge of the underlying system + the abstraction ("easier to use")</li>
<li>Hard to extend; do it in a different language</li>
<li>Moving through multiple states sucks for workflow</li>
<li>Takes as long as it takes</li>
</ul>
</aside>
</section>
<section data-background-image="assets/ideas.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Infrastructure as Model</h1>
<ul>
<li>Digital twin (Component <-> Resource)</li>
<li>1:1 to the Domain</li>
<li>Real world state as part of the model</li>
<li>Properties</li>
<li>Behavior</li>
</ul>
<aside class="notes">
<ul>
<li>Think of it as a digital twin</li>
<li>Digital (hypothetical) and real world (resource)</li>
<li>Heart lung machine</li>
<li>Avoids the 200% knowledge problem with 1:1 modeling<li>
<li>Describe the full properties and behaviors</li>
</ul>
</aside>
</section>
<section data-background-image="assets/declarative-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>A person sets properties on a component; hypothetical</li>
<li>They could call a behavior; create it</li>
<li>Creates a resource, the "real world" twin</li>
<li>Another person can change the resource directly</li>
<li>Go back the other way; no patching source, not git</li>
<li>Behaviors string into workflows; multi-step processes</li>
</ul>
</aside>
</section>
<section data-background-image="assets/benefits.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>Benefits</h1>
<ul>
<li>More control, more power</li>
<li>No 200% problem</li>
<li>Re-use configuration for behaviors</li>
<li>Workflows become trivial</li>
<li>Model declarative domains</li>
<li>Faster!</li>
</ul>
</section>
<!-- End of Declarative -->
<section data-background-image="assets/again.jpg" data-background-size="contain" data-background-opacity="0.4">
<h1><a href="#/choose">Choose Again</a></h1>
</section>
<!-- Single source of Truth -->
<section id="truth" data-background-image="assets/truth.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>Single Source of Truth</h1>
</section>
<section data-background-image="assets/truth.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>Tom Siebel</h1>
<aside class="notes">
<ul>
<li>Hard to say if Tom Siebel came up with this, or just popularized it</li>
<li>Sometime in the 90s</li>
<li>Driving for a single golden database</li>
<li>All your data accessible to everyone, perfectly related</li>
<li>Great idea for selling databases</li>
<li>Enterprise Service Bus, MDM</li>
</ul>
</aside>
</section>
<section data-background-image="assets/truth.jpg" data-background-size="cover" data-background-opacity="0.2">
<h1>Novell</h1>
<aside class="notes">
<ul>
<li>Novell's Identity Manager product</li>
<li>Single source of truth for all your employee data</li>
<li>Bobo T Clown</li>
</ul>
</aside>
</section>
<section data-background-image="assets/single-source-of-truth.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>People interact with services</li>
<li>Different services are "canonical" for thier data</li>
<li>Dump all their data on to an enterprise service bus</li>
<li>Services tap on the bus</li>
<li>We dump all the data into a big database</li>
<li>Now we have a holistic view of the data and a "single source of truth"</li>
</ul>
</aside>
</section>
<section data-background-image="assets/config-as-code-diagram.jpg" data-background-size="contain">
<aside class="notes">
<ul>
<li>Infrastructure as code though</li>
<li>We say the code on the left, your k8s yaml, your pulumui, your terraform, is the truth</li>
<li>and the interpreters job is to manipulate reality</li>
<li>Usually from a declaration</li>
<li>No bidirectionality</li>
<li>This is a terrible design for a single source of truth</li>
</ul>
</aside>
</section>
<section data-background-image="assets/good.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What's Good</h1>
<ul>
<li>Simplifies changes</li>
<li>Data flows one way</li>
<li>Easy to reason about</li>
</ul>
</section>
<section data-background-image="assets/sucks.jpg" data-background-size="contain" data-background-opacity="0.2">
<h1>What Sucks</h1>
<ul>
<li>Conflict resolution</li>
<li>Cannot resolve issues at the source</li>
<li>Poor mapping to this domain</li>
<li>It is a <span class="orange">lie</span></li>
</ul>
<aside class="notes">
<ul>
<li>What happens when reality diverges?</li>
<li>What are modeling changes too much outside the system</li>
<li>The truth is not your source code</li>
<li>The truth is obviously the infrastructure</li>
<li>How do we make it less of a lie?</li>
</ul>
</aside>