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<!doctype html>
<html>
<head>
<!-- Use with reveal.js 3.6.0 -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>CRDs, Operators and you</title>
<link rel="stylesheet" href="reveal.js-3.6.0/css/reveal.css">
<link rel="stylesheet" href="reveal.js-3.6.0/css/theme/black.css">
<link rel="stylesheet" href="css/custom.css">
<!-- Theme used for syntax highlighting of code -->
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<script>
var link = document.createElement( 'link' );
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document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
</head>
<body>
<div class="reveal">
<div class="slides" >
<section>
<section>
<h1>CRDs, Operators and you</h1>
<p/>
<img src="img/k8s.png" style="border:none; background:none;width:25%;"/><br/>
</section>
<section>
<h3>whoami</h3>
<div id="left">
<ul>
<li>Pieter Lange</li>
<li>IT infrastructure technician</li>
<li>[email protected]</li>
<li><a href="https://github.com/pieterlange/">github.com/pieterlange</a></li>
<li class="fragment" style="font-family: 'Lucida Console', Monaco, monospace;">eat, sleep, <img src="img/k8sparty.gif" style="border:none; background:none;width:10%;"/>, repeat</li>
</ul>
</div>
<div id="right">
<img src="img/profile.jpg" style="border:none; background:none;width:60%;"/><br/>
</div>
</section>
<section>
<a href="https://www.meetup.com/Kubernetes-Addicts-Support-Group/">kubernetes addicts support group</a><br/>
<img src="img/k8saddicts.jpg" style="border:none; background:none;width:65%;"/><br/>
</section>
<section>
<h1>Quick poll</h1>
<ul>
<li class="fragment">Who is NOT using docker?</li>
<li class="fragment">Who is using kubernetes?</li>
<li class="fragment">Who is using kubernetes in production? :-D</li>
<li class="fragment">Who's been to kubecon?!</li>
<ul>
</section>
<section>
<h3>Agenda</h3>
<small class="fragment"><em>"Robots will be able to do everything better than us" - Elon Musk</em></small><br/>
<ol>
<li>API's and CRD's</li>
<li>Some operator examples</li>
<li>Demo</li>
<li>Some observations</li>
<li>You</li>
</ol>
</section>
</section>
<section>
<section>
<h1>The kubernetes API</h1>
</section>
<section tagcloud data-transition="fade-in">
Cloud portability
Declarative configuration
Strong primitives
Versioned
Extensible
Vendor neutral
</section>
<section>
<h1>Kubernetes objects</h3>
<ul>
<li><a href="https://github.com/pieterlange/secretlifeofpods">Pods</a></li>
<li>Services</li>
<li>Volumes</li>
<li>Namespaces</li>
</ul>
</section>
<section>
<h1>Higher level Kubernetes objects</h3>
<ul>
<li>Deployments</li>
<li>Jobs</li>
<li>StatefulSets</li>
<li>DaemonSets</li>
<li class="fragment">Ingresses</li>
</ul>
</section>
<section>
<img src="img/depreppodnode.png" style="border:none; background:none;width:40%;margin: auto;display: block;"/><br/>
</section>
<section>
<h2>Pods</h2>
<pre>
<code data-trim>
apiVersion: v1
kind: Pod
metadata:
name: ptlcdebug
namespace: default
labels:
app: k8sday
spec:
containers:
- command:
- sleep
- "86400"
image: alpine:3.7
name: alpine
</code>
</pre>
</section>
<section data-transition="fade-out">
<h2>Services</h2>
<pre>
<code data-trim>
apiVersion: v1
kind: Service
metadata:
name: ptlc
namespace: default
spec:
ports:
- port: 80
targetPort: 3000
selector:
app: k8sday
status:
loadBalancer: {}
</code>
</pre>
</section>
<section data-transition="fade-in">
<h2>Services</h2>
<pre>
<code data-trim data-noescape>
<mark>apiVersion:</mark> v1
<mark>kind:</mark> Service
<mark>metadata:</mark>
<mark>name:</mark> ptlc
namespace: default
<mark>spec:</mark>
ports:
- port: 80
targetPort: 3000
selector:
app: k8sday
<mark>status:</mark>
loadBalancer: {}
</code>
</pre>
</section>
<section data-transition="fade-in">
<h2>Pod</h2>
<pre>
<code data-trim data-noescape>
<mark>apiVersion:</mark> v1
<mark>kind:</mark> Pod
<mark>metadata:</mark>
<mark>name:</mark> ptlcdebug
namespace: default
labels:
app: k8sday
<mark>spec:</mark>
containers:
- command:
- sleep
- "86400"
image: alpine:3.7
name: alpine
<mark>status:</mark>
podPhase: Running
</code>
</pre>
</section>
<section data-transition="fade-in">
<h2>Deployment</h2>
<pre>
<code data-trim data-noescape>
<mark>apiVersion:</mark> apps/v1
<mark>kind:</mark> Deployment
<mark>metadata:</mark>
<mark>name:</mark> ptlcdebug
namespace: default
<mark>spec:</mark>
replicas: 2
selector:
matchLabels:
app: k8sday
template:
metadata:
labels:
app: k8sday
containers:
- command:
- sleep
- "86400"
image: alpine:3.7
name: alpine
<mark>status:</mark>
readyReplicas: 2
</code>
</pre>
</section>
<section>
<img src="img/monkey.gif" style="border:none; background:none;width:40%;margin: auto;display: block;" /><br/>
</section>
<section>
<h2>Takeaways</h2>
<ul>
<li>Declarative configuration</li>
<li>Reconciliation loops</li>
<li>API groups and API versioning</li>
<li>Metadata</li>
<li>[spec]</li>
<li>[status]</li>
</ul>
</section>
</section>
<section>
<section>
<h3>Custom Resources</h3>
<ol>
<li>CustomResourceDefinitions</li>
<li>API Aggregation</li>
</ol>
</section>
<section>
<h3>CustomResourceDefinition</h3>
<pre>
<code data-trim data-noescape>
apiVersion: <span class="fragment" data-fragment-index="3">apiextensions.k8s.io/v1beta1</span>
kind: <span class="fragment" data-fragment-index="2">CustomResourceDefinition</span>
metadata:
name: <span class="fragment" data-fragment-index="4">openvpns.ptlc.nl</span>
spec:
group: <span class="fragment" data-fragment-index="4">ptlc.nl</span>
names:
kind: <span class="fragment" data-fragment-index="5">OpenVPN</span>
listKind: <span class="fragment" data-fragment-index="5">OpenVPNList</span>
plural: <span class="fragment" data-fragment-index="4">openvpns</span>
singular: <span class="fragment" data-fragment-index="4">openvpn</span>
scope: <span class="fragment" data-fragment-index="3">Namespaced</span>
version: <span class="fragment" data-fragment-index="6">v1alpha1</span>
</code>
</pre>
</section>
<section>
<h3>Custom Resource</h3>
<pre>
<code data-trim data-noescape>
apiVersion: <span class="fragment" data-fragment-index="1">ptlc.nl/v1alpha1</span>
kind: <span class="fragment" data-fragment-index="2">OpenVPN</span>
<span class="fragment" data-fragment-index="3">metadata:
name: k8sday
namespace: default</span>
<span class="fragment" data-fragment-index="4">spec:
podCIDR: 172.30.0.0/16
publicEndpoint:
hostname: vpn.ptlc.nl
port: 1194
protocol: tcp
serviceCIDR: 172.21.0.0/16</span>
</code>
</pre>
</section>
<section>
<h2>What's missing here?</h2>
<b class="fragment">input validation!</b>
<pre class="fragment">
<code data-trim data-noescape>
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: openvpns.ptlc.nl
spec:
group: ptlc.nl
version: v1alpha1
scope: Namespaced
names:
kind: OpenVPN
listKind: OpenVPNList
plural: openvpns
singular: openvpn
validation:
openAPIV3Schema:
properties:
spec:
properties:
pidCIDR
type: string
pattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
serviceCIDR:
type: string
pattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
</code>
</pre>
</section>
<section>
<h2>Tools for managing these things</h2>
<h3><a href="https://github.com/GoogleCloudPlatform/metacontroller">metacontroller</a></h3>
<p>Lightweight kubernetes controllers as a service</p>
<ul>
<li class="fragment">Basically a JSON generator/exploder</li>
<li class="fragment"><a href="https://github.com/GoogleCloudPlatform/metacontroller/tree/master/examples/bluegreen">bluegreen</a> is a nice example</a></li>
</ul>
</section>
<section>
<h2>Its more complicated than that..</h2>
<br>We need a logic engine to automatically respond to Events</br>
<ul>
<li class="fragment">Encode human operations/business logic into software</li>
<li class="fragment">Stateful services are sensitive beasts</li>
<li class="fragment">Scaling, backups, recovery, consensus, ...</li>
<li class="fragment">Cleanup</li>
</ul>
</section>
<section>
<h2>Examples</h2>
<p><a href="https://github.com/upmc-enterprises/elasticsearch-operator">elasticsearch-operator</a></p>
<img src="img/elastic.png" style="border:none; background:none;width:15%;"/>
</section>
<section>
<h2>Examples</h2>
<p><a href="https://github.com/coreos/prometheus-operator">prometheus-operator</a></p>
<img src="img/prometheus.png" style="border:none; background:none;width:15%;"/>
</section>
<section>
<h2>Examples</h2>
<p><a href="https://github.com/coreos/etcd-operator">etcd-operator</a></p>
<img src="img/etcd.png" style="border:none; background:none;width:15%;"/>
</section>
<section>
<h2>Examples</h2>
<p><a href="https://github.com/jetstack/cert-manager">cert-manager</a></p>
<img src="img/jetstack.png" style="border:none; background:none;width:20%;"/>
</section>
<section>
<h2>And many more</h2>
<p><a href="https://github.com/operator-framework/awesome-operators">awesome-operators</a></p>
<img src="img/awesome.png" style="border:none; background:none;width:20%;"/>
</section>
<section>
<h2>Tools for managing these things</h2>
<h3><a href="https://github.com/operator-framework/operator-sdk/">The operator framework</a></h3>
<ul>
<li class="fragment">High level API's</li>
<li class="fragment">Project scaffolding</li>
<li class="fragment">Extensions for common usecases</li>
</ul><br/>
<img src="img/operator-stable.png" class="fragment" style="border:none; background:none;width:60%;"/>
</section>
</section>
<section>
<h1>demo</h1>
<img src="img/openvpn-icon.png" class="fragment" style="border:none; background:none;width:10%;"/>
</section>
<section>
<section data-transition="fade-out">
<h1>Observations</h1>
</section>
<section data-transition="fade-in">
<h1>Observations</h1>
<p>operator-sdk is opinionated</p>
<ul>
<li class="fragment"><a href="https://github.com/operator-framework/operator-sdk/issues/236">operator per namespace</a></li>
<li class="fragment">doesn't encourage good patterns yet</li>
</ul>
</section>
<section>
<h3>abstractions are leaky</h3>
<img src="img/cloud-leaky.jpg" class="fragment" style="border:none; background:none;width:60%;"/>
</section>
</section>
<section>
<h1>you</h1>
<div id="left">
<img src="img/robots.jpg" class="fragment" style="border:none; background:none;width:100%;"/>
</div>
<div id="right">
<ul>
<li class="fragment">Automation makes our lives easier</li>
<li class="fragment">IT operations covers the <i>full stack</i></li>
<li class="fragment">Take back control of SaaS?</li>
</ul>
</div>
</section>
<section>
<section data-transition="fade-out">
<h1>thank you</h1>
<br/>
<img src="img/fullstaq.png" style="border:none; background:none;width:60%;"/><br/>
<ul>
<li><a href="https://github.com/pieterlange/openvpn-operator">https://github.com/pieterlange/<i>openvpn-operator</i></a></li>
<li><a href="https://github.com/pieterlange/kube-openvpn">https://github.com/pieterlange/<i>kube-openvpn</i></a></li>
<li><a href="https://github.com/pieterlange/k8sday">https://github.com/pieterlange/<i>k8sday</i></a></li>
</ul>
</section>
</section>
</div>
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