Update slides

deployment/.gitignore

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+*.js
+!jest.config.js
+*.d.ts
+node_modules
+
+# CDK asset staging directory
+.cdk.staging
+cdk.out

deployment/.npmignore

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+*.ts
+!*.d.ts
+
+# CDK asset staging directory
+.cdk.staging
+cdk.out

deployment/README.md

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+# Welcome to your CDK TypeScript project
+
+This is a blank project for CDK development with TypeScript.
+
+The `cdk.json` file tells the CDK Toolkit how to execute your app.
+
+## Useful commands
+
+* `npm run build`   compile typescript to js
+* `npm run watch`   watch for changes and compile
+* `npm run test`    perform the jest unit tests
+* `npx cdk deploy`  deploy this stack to your default AWS account/region
+* `npx cdk diff`    compare deployed stack with current state
+* `npx cdk synth`   emits the synthesized CloudFormation template

deployment/bin/deployment.ts

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+#!/usr/bin/env node
+import 'source-map-support/register';
+import * as cdk from 'aws-cdk-lib';
+import { DeploymentStack } from '../lib/deployment-stack';
+
+const app = new cdk.App();
+new DeploymentStack(app, 'DeploymentStack', {
+  /* If you don't specify 'env', this stack will be environment-agnostic.
+   * Account/Region-dependent features and context lookups will not work,
+   * but a single synthesized template can be deployed anywhere. */
+
+  /* Uncomment the next line to specialize this stack for the AWS Account
+   * and Region that are implied by the current CLI configuration. */
+  // env: { account: process.env.CDK_DEFAULT_ACCOUNT, region: process.env.CDK_DEFAULT_REGION },
+
+  /* Uncomment the next line if you know exactly what Account and Region you
+   * want to deploy the stack to. */
+  // env: { account: '123456789012', region: 'us-east-1' },
+
+  /* For more information, see https://docs.aws.amazon.com/cdk/latest/guide/environments.html */
+});

deployment/cdk.json

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+{
+  "app": "npx ts-node --prefer-ts-exts bin/deployment.ts",
+  "watch": {
+    "include": [
+      "**"
+    ],
+    "exclude": [
+      "README.md",
+      "cdk*.json",
+      "**/*.d.ts",
+      "**/*.js",
+      "tsconfig.json",
+      "package*.json",
+      "yarn.lock",
+      "node_modules",
+      "test"
+    ]
+  },
+  "context": {
+    "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
+    "@aws-cdk/core:checkSecretUsage": true,
+    "@aws-cdk/core:target-partitions": [
+      "aws",
+      "aws-cn"
+    ],
+    "@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver": true,
+    "@aws-cdk/aws-ec2:uniqueImdsv2TemplateName": true,
+    "@aws-cdk/aws-ecs:arnFormatIncludesClusterName": true,
+    "@aws-cdk/aws-iam:minimizePolicies": true,
+    "@aws-cdk/core:validateSnapshotRemovalPolicy": true,
+    "@aws-cdk/aws-codepipeline:crossAccountKeyAliasStackSafeResourceName": true,
+    "@aws-cdk/aws-s3:createDefaultLoggingPolicy": true,
+    "@aws-cdk/aws-sns-subscriptions:restrictSqsDescryption": true,
+    "@aws-cdk/aws-apigateway:disableCloudWatchRole": true,
+    "@aws-cdk/core:enablePartitionLiterals": true,
+    "@aws-cdk/aws-events:eventsTargetQueueSameAccount": true,
+    "@aws-cdk/aws-iam:standardizedServicePrincipals": true,
+    "@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker": true,
+    "@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName": true,
+    "@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy": true,
+    "@aws-cdk/aws-route53-patters:useCertificate": true,
+    "@aws-cdk/customresources:installLatestAwsSdkDefault": false,
+    "@aws-cdk/aws-rds:databaseProxyUniqueResourceName": true,
+    "@aws-cdk/aws-codedeploy:removeAlarmsFromDeploymentGroup": true,
+    "@aws-cdk/aws-apigateway:authorizerChangeDeploymentLogicalId": true,
+    "@aws-cdk/aws-ec2:launchTemplateDefaultUserData": true,
+    "@aws-cdk/aws-secretsmanager:useAttachedSecretResourcePolicyForSecretTargetAttachments": true,
+    "@aws-cdk/aws-redshift:columnId": true,
+    "@aws-cdk/aws-stepfunctions-tasks:enableEmrServicePolicyV2": true,
+    "@aws-cdk/aws-ec2:restrictDefaultSecurityGroup": true,
+    "@aws-cdk/aws-apigateway:requestValidatorUniqueId": true,
+    "@aws-cdk/aws-kms:aliasNameRef": true,
+    "@aws-cdk/aws-autoscaling:generateLaunchTemplateInsteadOfLaunchConfig": true,
+    "@aws-cdk/core:includePrefixInUniqueNameGeneration": true,
+    "@aws-cdk/aws-efs:denyAnonymousAccess": true,
+    "@aws-cdk/aws-opensearchservice:enableOpensearchMultiAzWithStandby": true,
+    "@aws-cdk/aws-lambda-nodejs:useLatestRuntimeVersion": true,
+    "@aws-cdk/aws-efs:mountTargetOrderInsensitiveLogicalId": true,
+    "@aws-cdk/aws-rds:auroraClusterChangeScopeOfInstanceParameterGroupWithEachParameters": true,
+    "@aws-cdk/aws-appsync:useArnForSourceApiAssociationIdentifier": true,
+    "@aws-cdk/aws-rds:preventRenderingDeprecatedCredentials": true,
+    "@aws-cdk/aws-codepipeline-actions:useNewDefaultBranchForCodeCommitSource": true
+  }
+}

deployment/jest.config.js

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+module.exports = {
+  testEnvironment: 'node',
+  roots: ['<rootDir>/test'],
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  }
+};

deployment/lib/deployment-stack.ts

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+import * as cdk from 'aws-cdk-lib';
+import * as s3 from 'aws-cdk-lib/aws-s3';
+import * as cloudfront from 'aws-cdk-lib/aws-cloudfront';
+import * as origins from 'aws-cdk-lib/aws-cloudfront-origins';
+import * as s3deploy from 'aws-cdk-lib/aws-s3-deployment';
+import { Construct } from 'constructs';
+import path = require('path');
+
+export class DeploymentStack extends cdk.Stack {
+  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
+    super(scope, id, props);
+
+    const staticBucket = new s3.Bucket(this, 'StaticBucket', {
+      autoDeleteObjects: true,
+      removalPolicy: cdk.RemovalPolicy.DESTROY,
+    });
+
+    const distribution = new cloudfront.Distribution(this, 'CDNServer', {
+      defaultBehavior: { origin: new origins.S3Origin(staticBucket) },
+      defaultRootObject: 'index.html'
+    });
+
+    new cdk.CfnOutput(this, 'URL', {
+      value: `https://${distribution.domainName}`
+    });
+
+    new s3deploy.BucketDeployment(this, 'DeployWithInvalidation', {
+      sources: [s3deploy.Source.asset(path.join(__dirname, '../../dist'))],
+      destinationBucket: staticBucket,
+      distribution: distribution,
+    });
+  }
+}

deployment/package.json

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+{
+  "name": "deployment",
+  "version": "0.1.0",
+  "bin": {
+    "deployment": "bin/deployment.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc -w",
+    "test": "jest",
+    "cdk": "cdk"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.5.11",
+    "@types/node": "20.11.5",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.1.1",
+    "aws-cdk": "2.122.0",
+    "ts-node": "^10.9.2",
+    "typescript": "~5.3.3"
+  },
+  "dependencies": {
+    "aws-cdk-lib": "2.122.0",
+    "constructs": "^10.0.0",
+    "source-map-support": "^0.5.21"
+  }
+}

deployment/test/deployment.test.ts

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+// import * as cdk from 'aws-cdk-lib';
+// import { Template } from 'aws-cdk-lib/assertions';
+// import * as Deployment from '../lib/deployment-stack';
+
+// example test. To run these tests, uncomment this file along with the
+// example resource in lib/deployment-stack.ts
+test('SQS Queue Created', () => {
+//   const app = new cdk.App();
+//     // WHEN
+//   const stack = new Deployment.DeploymentStack(app, 'MyTestStack');
+//     // THEN
+//   const template = Template.fromStack(stack);
+
+//   template.hasResourceProperties('AWS::SQS::Queue', {
+//     VisibilityTimeout: 300
+//   });
+});

deployment/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": [
+      "es2020",
+      "dom"
+    ],
+    "declaration": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "noImplicitThis": true,
+    "alwaysStrict": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": false,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "experimentalDecorators": true,
+    "strictPropertyInitialization": false,
+    "typeRoots": [
+      "./node_modules/@types"
+    ]
+  },
+  "exclude": [
+    "node_modules",
+    "cdk.out"
+  ]
+}

notes/NOTES.md

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+# Millionen langlebiger TCP-Verbindungen – Herausforderungen und Lösungen bei Update-Prozessen
+
+Neulich stehe ich am Bahnhof, mit gepackten Koffern, und will in meinen Urlaub starten. Beim Warten auf den (natürlich)
+verspäteten Zug hatte ich jede Menge Zeit zum überlegen. Ich habe mich gefragt: "Ist der Herd wirklich abgeschaltet?". Anders
+als in früheren Urlauben hatte ich aber einen smarten Herd daheim. Ich öffne also meine App, stelle fest, dass alles in Ordnung
+ist, und kann beruhigt in den Zug einsteigen.
+
+IoT (also "Internet of Things") beschreibt genau diese Art von Geräten. Mein Name ist Bene. Ich bin Softwareentwickler mit Fokus
+auf Softwarearchitektur bei Scandio. Wir bei Scandio entwickeln für unsere Kunden maßgeschneiderte intelligente und kreative
+Softwarelösungen. Wir haben dabei einen Schwerpunkt unter anderem im Bereich "Internet of Things".
+
+Ein Projekt aus diesem Bereich will ich heute vorstellen. Dabei geht es darum, wie die IoT-Geräte unseres Kunden mit
+verschiedenen Backends kommunizieren und um die Herausforderungen bei der Aktualisierung des Systems, das zwischen den Geräten
+und den Backends liegt.
+
+## Inhalt
+
+Ein kurzer Überblick über den Vortrag: Nach dem Projektsetup (also Hintergrund, Motivation und Ziel des Projekts) beschreibe ich
+euch die Problemstellung etwas genauer und dann natürlich auch die Lösungen, also: wie sieht die Architektur des Systems jetzt
+aus, was genau passiert, wenn das System Updates bekommt, und zum Schluss noch: was wären unsere Wunschträume für die
+Architektur, wenn Zeit und Geld keine Rolle spielen würde oder wir ganz von vorne anfangen würden.
+
+Eine organisatorische Bemerkung: wenn während des Vortrags Fragen aufkommen, stellt sie gerne sofort und ich werde sie so gut
+wie möglich beantworten.
+
+## Über Scandio
+
+Noch kurz ein paar Worte über Scandio: Neben IoT haben wir Stärken in den Bereichen Cloud und Systems Engineering, DevOps und
+Fullstack-Web-Entwicklung. Daneben unterstützen wir mit agilen Coaches und Beratern dabei, Prozesse zu optimieren. Insbesondere
+helfen wir als Atlassian Platinum Solution Partner unseren Kunden bei ihrer agilen Transformation.
+
+## Projektsetup
+
+Das Projekt, von dem ich heute rede, hat den Namen "Heimdall".
+
+Heimdall ist in der nordischen Mythologie der Wächter der Götterbrücke Bifröst (das ist der Regenbogen im Bild) und Heimdall hat
+außergewöhnliche Wahrnehmungsfähigkeiten. Hier im Bild ist das durch das Hören symbolisiert. Genauso wie Heimdall die Verbindung
+zwischen den Welten überwacht, fungiert unser Heimdall-System als ein Gateway, das die Brücke zwischen einer Vielzahl von
+IoT-Geräten und verschiedenen Backend-Systemen bildet. Ähnlich der mythischen Figur hat unser Heimdall die Aufgabe, die
+Sicherheit, Stabilität und Effizienz dieser Verbindungen zu gewährleisten.
+
+Heimdall wird seit 2018 entwickelt und hat ein vollständig extern entwickeltes und verwaltetes System abgelöst. Bei diesem alten
+System hatte unser Kunde keinen Zugriff auf den Source Code oder Entwicklungsdetails. Daher wurde die Entscheidung für eine
+Neuentwicklung getroffen. Die fehlenden Informationen über das alte System gingen sogar so weit, dass wir bei der Migration zu
+unserem neuen System regelmäßig das alte System überlastet haben, da wir einfach keine Informationen bekommen konnten, welche
+Last das alte System aushält. Mit diesem Lock-In-Effekt war unser Kunde verständlicherweise unzufrieden und hat uns beauftragt,
+Heimdall neu zu entwickeln.
+
+[5] Ich will hier einmal schematisch zeigen, welche Aufgabe Heimdall hat. Meine smarte Herdplatte von vorhin muss regelmäßig an
+das Herdplattenstatusbackend die Information senden, welche Herdplatten auf welcher Stufe angeschaltet sind. Gleichzeitig
+tauscht das smarte Heizungsthermostat eures Nachbarn Nachrichten mit einem Backend aus, um herauszufinden, ob die Heizung nach
+oben oder unten geregelt werden sollte, und die smarte Dunstabzugshaube eurer Tante meldet an das entsprechende Backend, dass
+die Filter mal wieder eine Reinigung bräuchten. Heimdall sitzt zwischen den Geräten und den Backends und sorgt dafür, dass die
+richtigen Nachrichten das richtige Backend erreichen, und dass umgekehrt auch Nachrichten in die Gegenrichtung versendet werden
+können: beispielsweise kann das Herdplattenbackend die Herdplatte anweisen, sich abzuschalten. Die Geräte halten dazu eine
+Verbindung zu Heimdall aufrecht. Über diese Verbindung werden die Nachrichten dann ausgetauscht. 
+
+## Problemstellung
+
+Das wichtigste Qualitätsziel bei Heimdall ist, dass diese Verbindungen zwischen Gerät und Heimdall so selten wie möglich
+unterbrochen werden. Das hat zwei Gründe: Zum einen kann ich als Nutzer nicht sehen, auf welcher Stufe mein Herd gerade kocht,
+wenn der Herd nicht mit Heimdall verbunden ist. Zum anderen finden einige Prozesse nach jeder Neuverbindung statt. Das kann
+potenziell zu Überlastung von Heimdall oder den Backends führen, wenn die Neuverbindungen zu häufig stattfinden.
+
+Ein Szenario gibt es aber, in dem Verbindungen auf keinen Fall gehalten werden können: nämlich wenn der Server, mit dem die
+Hausgeräte verbunden sind, ein Update bekommt und daher ersetzt werden muss. Deswegen ist eins der größten Ziele bei der
+Entwicklung der Architektur von Heimdall, dass solche Neustarts bei den meisten Konfigurationsänderungen des Systems nicht
+notwendig sind, sondern die Konfigurationsänderungen am Live-System durchgeführt werden können.
+
+## Lösungen
+
+Diesem Prinzip, dass Konfigurationsänderungen ohne Neustarts möglich sein sollen, werden wir bei der Betrachtung der
+Heimdall-Architektur noch öfter begegnen. Wir schauen uns jetzt mal an, wie Heimdall aufgebaut ist.
+
+[10] Das Kernstück von Heimdall ist der sogenannte "Web Socket Manager", kurz WSM. Eure Herdplatte kann über euer heimisches
+WLAN mit dem Internet kommunizieren. Nachdem die Firmware der Herdplatte gestartet und die Verbindung mit dem Internet
+hergestellt wurde, versucht die Herdplatte eine Websocket-Verbindung zum WSM zu öffnen. Dabei handelt es sich um eine dauerhafte
+Verbindung, über die zu beliebigen Zeiten Nachrichten in beide Richtungen entlang der Verbindung geschickt werden können. Die
+Verbindung wird so lange wie möglich aufrecht erhalten. Es gibt im Wesentlichen vier Gründe für den Abbruch der Verbindung: Das
+Gerät wurde abgeschaltet, die Netzwerkverbindung zwischen Gerät und WSM wurde unterbrochen, der WSM wurde beendet oder der WSM
+hat die Verbindung beendet. Im letzten Fall teilt also der WSM dem Gerät mit, dass über die Verbindung keine Daten mehr
+entgegengenommen oder verschickt werden können, ohne dass WSM oder Gerät beendet wurden. Gehen wir also mal davon aus, dass die
+Verbindung geöffnet ist und die Herdplatte mit dem WSM kommuniziert. Dann leitet der WSM die Nachrichten des Geräts an ein
+Backend weiter und umgekehrt werden Nachrichten vom Backend an das Gerät zurückgeleitet. Wenn es nur ein Gerät und nur ein
+Backend geben würde, wäre ich jetzt fertig mit der Präsentation. Das ist aber natürlich nicht alles.
+
+[15] In Wirklichkeit gibt es ja außer eurer Herdplatte auch noch den Thermostat eures Nachbarn, die Dunstabzugshaube eurer Tante
+und noch jede Menge andere Geräte, die mit den Backend-Systemen kommunizieren sollen. Unser Deployment ist in vier verschiedene
+Regionen aufgeteilt, und in der größten Region, der Region Europa, haben wir aktuell etwa 2,5 Millionen Geräte, die zur gleichen
+Zeit mit Heimdall verbunden sind. Deshalb gibt es auch mehrere WSM-Pods, also mehrere Instanzen des WSM. Zum einen wird dadurch
+die Skalierbarkeit des Systems verbessert, und zum anderen verlieren im Falle eines Crashs nicht alle Geräte gleichzeitig die
+Verbindung. Vor diesen Instanzen liegt ein Load Balancer, der versucht, die Verbindungslast möglichst gleichmäßig zu verteilen,
+um Rechenressourcen möglichst effizient nutzen zu können. Der Load Balancer routet die Verbindungen von den Geräten zum WSM im
+Round-Robin-Algorithmus, also: eure Herdplatte verbindet sich zuerst und wird an die erste Instanz geroutet, danach kommt die
+smarte Glühbirne eures Freunds, die wird dann an die zweite Instanz geroutet, und nach der letzten Instanz beginnt das Spiel von
+vorne. Bei synchronen Aufrufen an das Backend kommt die Antwort an die richtige WSM-Instanz zurück. Allerdings führen synchrone
+Aufrufe zu zwei Nachteilen: zum einen muss der WSM auf die Antwort des Backends warten und so lange die Verbindung zum Backend
+offen halten. Wenn sehr viele Nachrichten auf einmal verschickt werden und das Backend langsam arbeitet, kann das zur
+Überlastung des WSM führen. Ein zweiter Nachteil von synchronen Aufrufen ist die stärkere Kopplung: die Verarbeitung der
+Nachricht schlägt nämlich fehl, wenn das Backend oder weiter innen liegende Systeme bei der Verarbeitung der Nachricht
+scheitern. Da sind asynchrone Aufrufe die bessere Lösung. Das heißt, dass entweder das Backend die Nachricht entgegennimmt und
+erst im Nachgang verarbeitet, oder dass der WSM die Nachricht an einen hochverfügbaren Message Broker schickt und die Backends
+die Nachricht in ihrer Geschwindigkeit zu einer späteren Zeit konsumieren können. Egal, für welche Lösung man sich hier
+entscheidet: das Backend muss eine Nachricht zurück an das Gerät senden, weiß aber noch nicht, mit welcher WSM-Instanz das Gerät
+verbunden ist. Übrigens hätten wir das selbe Problem auch ganz ohne asynchrone Aufrufe: sagen wir mal, euer Nachbar möchte seiner
+Heizung mitteilen, dass sie die Temperatur in der Wohnung auf 22 Grad hochregeln soll, weil er jetzt auf dem Heimweg ist. Dann
+muss das Heizungsbackend eine Nachricht an den Thermostat schicken. Wenn das Backend versucht, die Nachricht über eine zufällige
+Instanz des WSM zu schicken, ist die Chance nicht sehr hoch, dass der Thermostat gerade mit dieser Instanz verbunden ist.
+
+Hier kommen der Forwarding-Service (kurz FORS) und eine Adress-Datenbank ins Spiel. Jeder WSM-Pod schreibt nach einer geöffneten
+Verbindung mit einem Gerät die Geräte-ID zusammen mit der eigenen Adresse in die Adress-Datenbank. Der FORS fragt jetzt für ein
+Gerät die richtige Adresse ab und kann Nachrichten vom Backend an die richtige WSM-Instanz weiterleiten. Konkret schaut der
+Ablauf also so aus: Gerät 1 baut eine Websocket-Verbindung zu WSM-Pod 1 auf. In der Folge teilt WSM-Pod 1 der Adress-Datenbank
+mit: Gerät 1 ist mit dem Pod verbunden, der Adresse 1 besitzt. An der Kommunikation vom Gerät zum Backend hat sich nichts
+geändert. Wenn jetzt aber das Backend eine Nachricht an das Gerät senden möchte, dann wird die Nachricht an unseren
+Forwarding-Service geschickt. Der Forwarding-Service fragt die konkrete Adresse des richtigen WSM-Pods bei der Adress-Datenbank
+an und leitet die Nachricht entsprechend weiter. Dann ist die Nachricht beim richtigen WSM gelandet und kann an das Gerät über
+die Websocket-Verbindung geschickt werden.
+
+[20] Dazu kommt, dass es in Wirklichkeit nicht nur ein Backend gibt. Ein Message Mapping kann vom WSM genutzt werden, um zu
+entscheiden, an welches Backend ein konkreter Nachrichtentyp mit einer konkreten Version gesendet werden soll. Der Ablauf hier
+ist also: Das Gerät (der Einfachheit halber habe ich in diesem Bild nur noch ein Gerät) schickt die Nachricht mit dem Typ
+"/foo/config" und der Version 1 an den WSM. Der WSM findet mit Hilfe des Message Mappings heraus, dass Backend 1 für die
+Verarbeitung der entsprechenden Nachrichten verantwortlich ist und leitet die Nachricht entsprechend weiter. Wir sind also wie
+ein Postunternehmen dafür zuständig, dass die richtigen Nachrichten an den richtigen Empfänger gelangen, aber nicht dafür, dass
+die Nachrichten inhaltlich auch sinnvoll sind. Es findet also bei Heimdall keinerlei Validierung der Nachrichten statt. Das
+Message Mapping ändert sich regelmäßig. Deshalb ist es wichtig, dass eine Rekonfiguration ohne Neustart der WSM-Pods möglich
+ist, da sonst ja Verbindungen gekappt werden müssten.
+
+Der WSM hat noch diverse andere Aufgaben:
+
+* Er führt den TLS-Handshake durch. Das heißt: alle Informationen, die zwischen Gerät und WSM ausgetauscht werden, werden
+  verschlüsselt ausgetauscht. Dabei muss sich sowohl der Server, also der WSM, beim Gerät authentifizieren, als auch das Gerät
+  nachweisen, dass es sich tatsächlich um ein Gerät unseres Kunden handelt. Die Authentifizierungen finden statt, indem
+  überprüft wird, dass Gerät und WSM beide Zertifikate besitzen, die von einer vertrauenswürdigen Entität, also einer
+  Certificate Authority (kurz CA) des Kunden signiert wurden.
+* Bei der Validierung des Zertifikats, das das Gerät ausweist, gibt es noch ein paar Details zu beachten. Nämlich gibt es etwa
+  10 verschiedene ausstellende CAs, also Certificate Authorities, denen der WSM vertrauen soll. Manche dieser CAs haben
+  Zertifikate ausgestellt, die inzwischen abgelaufen sind und die daher von einer Standard-Validierung nicht akzeptiert werden
+  würden. Das Problem dabei: für Firmware-Updates müssen auch Nachrichten über Heimdall ausgetauscht werden, und die
+  entsprechenden Geräte-Zertifikate können ohne ein Firmware-Update nicht aktualisiert werden. Deshalb muss Heimdall auf die
+  Validierung des Gültigkeitszeitraums für die entsprechenden CAs verzichten.
+* Manche Geräte-Zertifikate sollen außerdem sofort abgelehnt werden, weil die entsprechenden Geräte defekt sind. Das wird über
+  eine Datenbank mit blockierten Zertifikaten geregelt. Für das Blockieren eines Zertifikats ist wie beim Message Mapping kein
+  Neustart des WSM notwendig, sodass auch hier Neuverbindungen vermieden werden.
+* Noch einmal andere Geräte sind in einem Quarantäne-Status. Für diese Geräte dürfen nur bestimmte Nachrichten versendet und
+  empfangen werden, beispielsweise wieder Nachrichten im Zusammenhang mit Firmware-Updates. Wie die blockierten Zertifikate wird
+  das über eine eigene Datenbank konfiguriert und benötigt keinen WSM-Neustart.
+* Dann muss der WSM noch den Websocket-Upgrade durchführen (dazu sage ich später noch mehr).
+* Schließlich gibt es noch einen Corporate Handshake, der vom Protokoll unseres Kunden vorgesehen ist. Bevor dieser Handshake
+  abgeschlossen ist, dürfen keine anderen Nachrichten in beide Richtungen gesendet oder weitergeleitet werden.
+
+[25] Hier ist noch einmal eine Zusammenfassung des gesamten Heimdall-Systems, soweit es für den Vortrag relevant ist. Die
+Grundidee ist also, dass der WSM so selten wie möglich neugestartet werden muss. Das erreichen wir, indem Konfiguration, die
+sich regelmäßig ändern könnte, externalisiert wird und ohne Neustarts geändert werden kann. Das sieht man in diesem Bild durch
+das Message Mapping und die beiden Datenbanken zum Blockieren von Zertifikaten und für den Quarantäne-Status.
+
+Was passiert jetzt aber, wenn der WSM doch einmal neugestartet werden muss oder abstürzt? Wenn ein WSM-Pod kontrolliert beendet
+wird, werden die Verbindungen zu den entsprechenden Geräten nacheinander beendet. Dann verbinden sich die Geräte mit anderen
+Instanzen neu. Aktuell dauert dieser Prozess in unserer größten Stage mit etwa 2,5 Millionen Geräten knapp 3 Stunden. Da wir ja
+Round-Robin für das Load Balancing nutzen, hat der Ersatz-Pod, der hier gestartet wurde, danach deutlich weniger offene
+Verbindungen als die alten Pods. In der Praxis führt das nicht zu Problemen, denn die Last ist bei neuen Verbindungen mit
+Abstand am höchsten.
+
+Falls ein Pod (beispielsweise aufgrund eines Bugs) unkontrolliert beendet wird, versuchen sich alle Geräte auf einmal neu zu
+verbinden. Das würde zur Überlastung des Systems führen, daher gibt es einen Rate Limiter, der dafür sorgt, dass sich Geräte
+nicht zu schnell wieder verbinden können. Natürlich ist das ein ungünstiger Zustand, da die Funktionalität der noch nicht wieder
+verbundenen Geräte eine ganze Weile eingeschränkt sein kann.
+
+Jetzt kommen wir mal zum geplanten Fall: eine neue WSM-Version soll deployed werden. Das Deployment läuft dann so ab: In einem
+ersten Schritt werden 1/3 der Instanzen durch Instanzen der neuen Version als Canary-Deployment ersetzt. Diese neue Version
+läuft parallel zu der alten für eine Woche, bevor auch die übrigen Instanzen ersetzt werden. So können Fehler frühzeitig erkannt
+und behoben werden, bevor alle Geräte betroffen sind.
+
+[30] Das bedeutet übrigens nicht, dass nach dem Canary-Deployment 1/3 der Verbindungen auf der neuen Version stattfinden. Die
+Wahrheit ist hier etwas komplizierter: die Geräte, die sich nach dem Abschalten mancher der alten Instanzen neu verbinden,
+verbinden sich ja genauso häufig mit jeder der Canary-Instanzen wie mit jeder der alten Stable-Instanzen. In dem 7-Tage-Zeitraum
+gleichen sich die Anzahl der verbundenen Geräte dann etwas aus, weil Geräte regelmäßig auch aus anderen Gründen die Verbindung
+verlieren und sich neu verbinden. Nach einer Woche werden die übrigen 2/3 der Instanzen ersetzt und wie vorhin haben dann die
+zuerst deployeten Canary-Instanzen mehr offene Verbindungen als die zuletzt deployeten. Wie gesagt führt das allerdings in der
+Praxis zu keinen Problemen und gleicht sich auf Dauer von selbst aus.
+
+Jetzt habt ihr gesehen, wie das System tatsächlich aussieht. Natürlich haben wir in den gut 5 Jahren, in denen das Projekt
+existiert, auch dazugelernt und würden einige Dinge anders gestalten. Am Anfang des Vortrags habe ich ja schon gesagt, dass das
+Ziel wäre, den WSM so selten wie möglich updaten zu müssen. Dafür ist es hilfreich, wenn der WSM so wenige Aufgaben wie möglich
+bekommt. In einer idealen Welt sollte daher der WSM der kleinste Service im gesamten System sein. Die Realität ist: der WSM ist
+der mit Abstand größte Service des Heimdall-Systems.
+
+Woran liegt das? Aktuell hat der WSM einige Aufgaben:
+
+* TLS und alles, was dazugehört: die Terminierung der TLS-Verbindung, die Validierung der Geräte-Zertifikate, die Ausnahmen zur
+  Validierung der Zertifikate und das Blocklisting von Zertifikaten.
+* Der Websocket-Upgrade, also die Entgegennahme der initialen HTTP-Verbindung und der Wechsel zum Websocket-Protokoll
+* Der Corporate Handshake, der zu Beginn jeder Verbindung stattfinden muss
+* Das Message Routing an die Backends inklusive Offenhalten der Verbindungen und Warten auf Antworten
+* Die Quarantäne-Logik
+* Einige andere Workarounds, die im WSM diverse Spezialfälle abhandeln
+
+Um also den WSM möiglichst klein zu bekommen, müssen möglichst viele dieser Aufgaben ausgelagert werden. Oder umgekehrt: die
+Aufgaben, die unbedingt notwendig zum Halten der Verbindung sind, sollten aus dem WSM extrahiert werden.
+
+[35] Bevor ich einen Vorschlag vorstelle, wie wir das erreichen könnten, will ich noch einmal ein bisschen detaillierter
+erklären, wie das Websocket-Protokoll funktioniert. Das Gerät eröffnet zu Beginn eine TCP-Verbindung zum WSM. Es ist nicht
+besonders wichtig zu wissen, was TCP genau macht, sondern nur, dass man bei einer TCP-Verbindung Daten in beide Richtungen
+verschicken kann und dass die TCP-Verbindung jederzeit auf beiden Seiten geschlossen werden kann. Nach Öffnung der
+zugrundeliegenden Verbindung findet der TLS-Handshake mit Verschlüsselung und Authentifizierung statt. Ab diesem Zeitpunkt
+verläuft die Kommunikation verschlüsselt und der WSM kennt ein Zertifikat, das das jeweilige Gerät ausweist. Als nächstes wird
+vom Gerät der Websocket-Endpunkt aufgerufen und der WSM wechselt das Protokoll zum Websocket-Protokoll. Ab hier können beliebige
+Daten im Websocket-Protokoll zwischen Gerät und WSM hin und her geschickt werden. Dann passiert der Corporate Handshake und
+schließlich der Austausch von beliebigen anderen Nachrichten, beispielsweise über den Status der Geräte. Die Verbindung
+inklusive TLS-Terminierung muss von einem einzigen Server gehalten werden, wenn wir nicht komische Nichtstandard-Dinge mit
+Verschlüsselung tun wollen, was aus Security-Gesichtspunkten natürlich keine gute Idee ist. Allerdings könnte die gesamte
+Kommunikation, die nach der Entschlüsselung der Nachrichten, also unterhalb der ersten gestrichelten Linie, stattfindet,
+außerhalb des Services stattfinden, der die Verbindung hält.
+
+Hier wäre daher unser Vorschlag, um die Verbindungen noch länger halten zu können. Vor die übrigen Systeme wird ein Service
+gesetzt, den ich hier "Connection Holder" genannt habe und der nur dafür zuständig ist, die TCP-Verbindung zu den Geräten zu
+halten, die TLS-Verschlüsselung zu terminieren und zu Validieren, dass die Geräte-Zertifikate von einem bekannten Issuer
+ausgestellt wurden. Nach der TLS-Terminierung wird die TCP-Verbindung einfach an das Äquivalent des jetzigen WSMs
+weitergetunnelt. Wenn die WSM-Instanz beendet wird, kann der Tunnel an eine andere WSM-Instanz weitergeroutet werden, ohne die
+Verbindung zum Gerät abzubrechen. Damit der WSM Zertifikatslogik wie Blocklisting durchführen kann, muss zu Beginn des
+Verbindungsaufbaus zwischen Connection Holder und WSM das validierte Geräte-Zertifikat mitgeschickt werden. Außerdem müssen die
+Verbindungen eine eindeutige ID bekommen, sodass die WSM-Instanzen beispielsweise persistieren können, ob für eine gegebene
+Verbindung bereits der Corporate Handshake durchgeführt wurde. Natürlich könnten auch andere Aufgaben aus dem WSM ausgelagert
+werden, hier mal exemplarisch das Message Routing inklusive Warten auf die Antwort des Backends.
+
+[40] Schauen wir uns das ganze in der Laufzeitsicht etwas genauer an. Das Gerät öffnet also eine TCP-Verbindung inklusive TLS
+zum Connection Holder. Diese Verbindung soll jetzt möglichst lange bestehen bleiben. Der Connection Holder erstellt eine
+eindeutige Verbindungs-ID, die der WSM später nutzen kann, um Verbindungen zu identifizieren und ihren Status zu vergleichen.
+Der Connection Holder sucht sich per Load Balancing eine WSM-Instanz, zu der er eine TCP-Verbindung öffnet. Das Gerät öffnet
+eine Websocket-Verbindung zum Connection Holder, der wiederum eine Websocket-Verbindung zum WSM öffnet. Dort wird überprüft, ob
+das validierte Geräte-Zertifikat akzeptiert werden soll und gegebenenfalls kann der WSM an dieser Stelle die Verbindung sofort
+beenden. Andernfalls wird die Connection-ID persistiert, mit dem Status "hier existiert eine Verbindung, für die aber noch kein
+Corporate Handshake durchgeführt wurde". Die Antworten "101 Switching Protocols" sorgen dafür, dass die jeweiligen
+Websocket-Verbindungen geöffnet sind. Alle weiteren Nachrichten werden vom Connection Holder zwischen Gerät und WSM
+weitergetunnelt. Jetzt kann der WSM also wie gehabt den Corporate Handshake durchführen, würde danach auch wieder einen Status
+für die jeweilige Verbindung persistieren, und könnte dann Nachrichten wie zuvor weiterleiten. Wenn jetzt die TCP-Verbindung vom
+WSM beendet wird, öffnet der Connection Holder eine TCP-Verbindung zu einer anderen WSM-Instanz und versucht, auch dorthin eine
+Websocket-Verbindung zu etablieren. Durch die persistierte Connection-ID erkennt die zweite WSM-Instanz, dass der Corporate
+Handshake bereits durchgeführt wurde und behandelt die Verbindung entsprechend. Ab diesem Zeitpunkt werden Nachrichten an die
+zweite WSM-Instanz weitergetunnelt. Das Gerät merkt davon nichts.
+
+Von innen betrachtet würde der Connection Holder so aussehen: Außen liegt der TCP Connector, der die TCP-Verbindung zum Gerät
+entgegennimmt und die Connection-ID erstellt. Dann kommt ein Filter, der für die TLS-Terminierung inklusive Extraktion des
+Geräte-Zertifikats zuständig ist. Zum Schluss noch der Websocket-Filter, der die Websocket-Verbindungen zum WSM verwaltet.
+
+Was wären die Nachteile des vorgeschlagenen Refactorings? Zum einen natürlich die Entwicklungskosten, bestehend aus den
+Entwicklungskosten des Connection Holders, den notwendigen Refactorings im WSM sowie den notwendigen ausführlichen Tests, um zu
+gewährleisten, dass das System funktioniert wie geplant. Zum anderen käme in die Servicelandschaft bei Heimdall ein weiterer
+Service hinzu, der potenziell gewartet und beim Onboarding neuer Entwickler:innen berücksichtigt werden muss. Allerdings können
+die Nachteile relativiert werden, und es gibt auch einige Vorteile: zum einen ist das notwendige Refactoring im WSM minimal,
+denn nur die Logik für das Persistieren und Überprüfen des Verbindungsstatus kommt hinzu. Die Entwicklung des Connection Holder
+ist auch nicht sonderlich aufwändig, da er relativ wenige Aufgaben hat. Entsprechend hält sich auch der Overhead beim Onboarding
+in Grenzen. Der große Vorteil allerdings ist, dass der Connection Holder äußerst selten Updates benötigt. Hier ist zu erwarten,
+dass die Businesslogik sich sehr selten ändert, also werden Updates hauptsächlich aus Security-Gründen nötig werden. Der große
+Vorteil ist jetzt, dass WSM-Updates ohne Verbindungsneustarts möglich werden. Insbesondere führt das dazu, dass die Updates des
+WSM deutlich schneller stattfinden können und außen liegende Systeme weniger beeinflussen. Das führt zu einer verbesserten
+Time-To-Market bei neuen Features und zu verringerten Abhängigkeiten und Kommunikations-Overheads zu anderen Teams.
+
+Zusammenfassend können wir schon im aktuellen System zuverlässig dafür sorgen, dass Konfiguration schnell und unkompliziert ohne
+Neuverbindungen geändert werden kann. Neuverbindungen komplett zu vermeiden dürfte nicht möglich sein, aber wir haben Ideen, wie
+wir uns in diese Richtung verbessern können. Ich hoffe, ich konnte euch einen guten Einblick in die Herausforderungen geben, vor
+die uns die langlaufenden Verbindungen in Zusammenhang mit Systemupdates stellen.
+
+Hier seht ihr noch einmal, wie ihr mich erreichen könnt. Danke fürs Zuhören!

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src/diagrams/arch1.tex

@@ -6,8 +6,9 @@
   \node (WSM) at (4,4) [component, inner sep=12px] { WSM };
   \node (Backend) at (4,7) [component,external] { Backend };
   \draw[very thick, rounded corners=6px] (0,2) rectangle (8,6) ++(0, 0.1) node [label, anchor=south east] { \large Heimdall };
-  \draw (Device) edge [<->] (WSM);
+  \draw (Device) edge [<->] node (Websocket) {} (WSM);
   \draw (WSM) edge [->, bend left=10] (Backend) (Backend) edge [->, response, bend left=10] (WSM);
   \node at (5.5,4.5) [stickynote, callout absolute pointer=(WSM.20), anchor=south west] { Web Socket\\Manager };
+  \node at (2.5,3.5) [stickynote, callout absolute pointer=(Websocket.center), anchor=north east] { Websocket-\\Verbindung };
 \end{tikzpicture}
 \end{document}

src/diagrams/arch4.tex

@@ -17,7 +17,7 @@
   \draw (Device) edge [<->] (WSM);
 
   \draw (WSM) edge [->, bend left=10] node [auto, sloped, swap] { \scriptsize /foo/config;v1 } (Message Mapping.325)
-        (Message Mapping.0) edge [->, response, bend left=10] node [auto, sloped] { \scriptsize Backend 2 } (WSM);
+        (Message Mapping.0) edge [->, response, bend left=10] node [auto, sloped] { \scriptsize Backend 1 } (WSM);
 
   \draw (WSM) edge [->] (Backend1);
   \draw (Backend1) edge [->,response] (FORS);

src/diagrams/connection-holder-internal.tex

@@ -0,0 +1,16 @@
+\input{lib/preamble.tex}
+
+\begin{document}
+\begin{tikzpicture}
+  \node (Device) at (4,1) [component,external] { Gerät };
+  \node (WSM) at (4,9) [component,external] { WSM };
+  \node (TCPConn) at (4,3.5) [component] { TCP Connector };
+  \node (TLSFilter) at (4,5) [component] { TLS Filter };
+  \node (WSFilter) at (4,6.5) [component] { Websocket Filter };
+  \draw[very thick, rounded corners=6px] (0,2) rectangle (8,8) ++(0, 0.1) node [label, anchor=south east] { Connection Holder };
+  \draw (Device) edge [<->] (TCPConn)
+        (TCPConn) edge [<->] (TLSFilter)
+        (TLSFilter) edge [<->] (WSFilter)
+        (WSFilter) edge [<->] (WSM);
+\end{tikzpicture}
+\end{document}

src/diagrams/connection-holder-runtime.tex

@@ -0,0 +1,84 @@
+\input{lib/preamble.tex}
+
+\begin{document}
+\begin{tikzpicture}[scale=1.35]
+  \node (Device) at (0,10) [component] { Gerät };
+  \node (CH) at (4,10) [component] { CH };
+  \node (WSM1) at (8,10) [component] { WSM 1 };
+  \node (WSM2) at (10,10) [component] { WSM 2 };
+  \path (Device) edge [dashed]
+        node[pos=0.1] (TCP-Device) {}
+        node[pos=0.28] (HTTP-Device) {}
+        node[pos=0.48] (Switch-Device) {}
+        node[pos=0.55] (WSEx1-Device) {}
+        node[pos=0.95] (WSEx2-Device) {}
+        node[pos=1] (Device-End) {}
+        ++(0,-10);
+  \path (CH) edge [dashed]
+        node[pos=0.1] (TCP-CH) {}
+        node[pos=0.13] (Conn-Id-Create1) {}
+        node[pos=0.16] (Conn-Id-Create2) {}
+        node[pos=0.22] (TCP2-CH) {}
+        node[pos=0.28] (HTTP-CH) {}
+        node[pos=0.33] (HTTP2-CH) {}
+        node[pos=0.43] (Switch2-CH) {}
+        node[pos=0.48] (Switch-CH) {}
+        node[pos=0.55] (WSEx1-Tunnel) {}
+        node[pos=0.62] (ConnEnd-CH) {}
+        node[pos=0.69] (TCP3-CH) {}
+        node[pos=0.77] (HTTP3-CH) {}
+        node[pos=0.88] (Switch3-CH) {}
+        node[pos=0.95] (WSEx2-Tunnel) {}
+        node[pos=1] (CH-End) {}
+        ++(0,-10);
+  \path (WSM1) edge [dashed]
+        node[pos=0.22] (TCP2-WSM1) {}
+        node[pos=0.33] (HTTP2-WSM1) {}
+        node[pos=0.365] (Conn-Id-Persist1) {}
+        node[pos=0.395] (Conn-Id-Persist2) {}
+        node[pos=0.43] (Switch2-WSM1) {}
+        node[pos=0.55] (WSEx1-WSM1) {}
+        node[pos=0.62] (ConnEnd-WSM1) {}
+        node[pos=1] (WSM1-End) {}
+        ++(0,-10);
+  \path (WSM2) edge [dashed]
+        node[pos=0.69] (TCP3-WSM2) {}
+        node[pos=0.77] (HTTP3-WSM2) {}
+        node[pos=0.81] (Conn-Id-Status1) {}
+        node[pos=0.84] (Conn-Id-Status2) {}
+        node[pos=0.88] (Switch3-WSM2) {}
+        node[pos=0.95] (WSEx2-WSM2) {}
+        node[pos=1] (WSM2-End) {}
+        ++(0,-10);
+
+  \draw (TCP-Device.center) edge [<->] node [above] { TCP-Verbindung } node [below] { TLS } (TCP-CH.center)
+        (HTTP-Device.center) edge [->] node [above] { HTTP GET Websocket-Endpunkt } (HTTP-CH.center)
+        (Switch-Device.center) edge [<-,dashed] node [above] { 101 Switching Protocols } (Switch-CH.center)
+        (WSEx1-Device.center) edge [<->] node [above=0.1,fill=white] { Websocket-Austausch } (WSEx1-WSM1.center)
+        (WSEx2-Device.center) edge [<->] node [pos=0.6,below,fill=white] { Websocket-Austausch } (WSEx2-WSM2.center)
+        ;
+
+  \draw (Conn-Id-Create1.center) edge [->,bend left=90,looseness=2]
+                                 node [anchor=west] { \small erstelle connection ID } (Conn-Id-Create2.center)
+        (TCP2-CH.center) edge [<->] node [above] { TCP-Verbindung } (TCP2-WSM1.center)
+        (HTTP2-CH.center) edge [->] node [above] { HTTP GET Websocket-Endpunkt }
+                                    node [below] { \scriptsize inkl. Connection-ID + Geräte-Zertifikat } (HTTP2-WSM1.center)
+        (Switch2-CH.center) edge [<-,dashed] node [above] { 101 Switching Protocols } (Switch2-WSM1.center)
+        (ConnEnd-CH.center) edge [<-] node [above] { Verbindung wird beendet } (ConnEnd-WSM1.center)
+        (TCP3-CH.center) edge [<->] node [above,fill=white,pos=0.4] { TCP-Verbindung } (TCP3-WSM2.center)
+        (HTTP3-CH.center) edge [->] node [above,fill=white] { HTTP GET Websocket-Endpunkt }
+                                    node [below,fill=white] { \scriptsize inkl. Connection-ID + Geräte-Zertifikat } (HTTP3-WSM2.center)
+        (Switch3-CH.center) edge [<-,dashed] node [above,fill=white] { 101 Switching Protocols } (Switch3-WSM2.center)
+        ;
+
+  \draw (Conn-Id-Persist1.center) edge [->,bend left=90,looseness=2]
+                                  node [anchor=west,align=left] { \small persistiere\\\small Connection-ID } (Conn-Id-Persist2.center)
+        (Conn-Id-Status1.center) edge [->,bend left=90,looseness=2]
+                                 node [anchor=west,align=left] { \small hole persistierten\\\small Status zu\\\small Connection-ID } (Conn-Id-Status2.center)
+        ;
+
+
+  \node[shape=rectangle,fill=white,draw=black] at (WSEx1-Tunnel) {};
+  \node[shape=rectangle,fill=white,draw=black] at (WSEx2-Tunnel) {};
+\end{tikzpicture}
+\end{document}

src/diagrams/deployment1.tex

@@ -3,14 +3,15 @@
 \begin{document}
 \begin{tikzpicture}[decoration={random steps,amplitude=0.15mm,segment length=0.3mm}]
   \draw[->] (-0.2,0) -- (8.2,0) node[anchor=north] {t};
-  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\#};
+  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\# Geräte};
 
   \draw[help lines, dashed] (3,-0.4)--(3,3.8) (6,-0.4)--(6,3.8);
 
   \draw[color=scandioblue,decorate] (0,3.13)--(3,3.13)--(6,4.13)--(8,4.13);
   \draw[color=green!60!black,decorate] (0,2.8)--(3,2.8)--(6,3.8)--(8,3.8);
 
-  \draw[color=scandiored,decorate] (0,3)--(3,3)--(6,0) (3,0)--(6,1)--(8,1);
+  \draw[color=scandiored,decorate] (0,3)--(3,3) (3,0)--(6,1)--(8,1);
+  \draw[color=scandiored] (3,3)--(6,0);
   \draw[color=scandiored, thick] (3,2.9)--(3,3.1) (3,-0.1)--(3,0.1);
 \end{tikzpicture}
 \end{document}

src/diagrams/deployment2.tex

@@ -3,7 +3,7 @@
 \begin{document}
 \begin{tikzpicture}[decoration={random steps,amplitude=0.15mm,segment length=0.3mm}]
   \draw[->] (-0.2,0) -- (8.2,0) node[anchor=north] {t};
-  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\#};
+  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\# Geräte};
 
   \draw[help lines, dashed] (3,-0.4)--(3,3.8) (6,-0.4)--(6,3.8);
 

src/diagrams/deployment3.tex

@@ -1,15 +1,15 @@
 \input{lib/preamble.tex}
 
 \begin{document}
-\begin{tikzpicture}[decoration={random steps,amplitude=0.15mm,segment length=0.3mm}]
+\begin{tikzpicture}
   \draw[->] (-0.2,0) -- (8.2,0) node[anchor=north] {t};
-  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\#};
+  \draw[->] (0,-0.2) -- (0,4.2) node[anchor=east] {\# Pods};
 
   \draw[help lines, dashed] (2,-0.4)--(2,3.8) (3,-0.4)--(3,3.8) (6,-0.4)--(6,3.8) (7,-0.4)--(7,3.8);
 
-  \draw[color=scandiored,decorate] (0,3.6)--(2,3.6)--(3,2.4)--(6,2.4)--(7,0);
+  \draw[color=scandiored] (0,3.6)--(2,3.6)--(3,2.4)--(6,2.4)--(7,0);
   \node[anchor=south, color=scandiored] at (1,3.6) { \scriptsize stable };
-  \draw[color=scandioblue,decorate] (2,0)--(3,1.2)--(6,1.2)--(7,3.6)--(8,3.6);
+  \draw[color=scandioblue] (2,0)--(3,1.2)--(6,1.2)--(7,3.6)--(8,3.6);
   \node[anchor=south, color=scandioblue] at (4.5,1.2) { \scriptsize canary };
   \node[anchor=south, color=scandioblue] at (7.5,3.6) { \scriptsize stable };
 \end{tikzpicture}

src/diagrams/deployment4.tex

@@ -1,29 +1,27 @@
 \input{lib/preamble.tex}
 
 \begin{document}
-\begin{tikzpicture}[decoration={random steps,amplitude=0.15mm,segment length=0.3mm}]
-  \draw[->] (-0.2,0) -- (8.2,0) node[anchor=north] {t};
-  \draw[->] (0,-0.2) -- (0,5.2) node[anchor=east] {\#};
+\begin{tikzpicture}[every node/.style={inner sep=2px}]
+  \draw[->] (-0.2,0) -- (10.2,0) node[anchor=north] {t};
+  \draw[->] (0,-0.2) -- (0,5.7) node[anchor=south] {\# Geräte pro Instanz};
 
-  \draw[help lines, dashed] (2,-0.4)--(2,3.8) (3,-0.4)--(3,3.8) (6,-0.4)--(6,3.8) (7,-0.4)--(7,3.8);
+  \draw[help lines, dashed] (2,-0.4)--(2,5.3) (3,-0.4)--(3,5.3) (6,-0.4)--(6,5.3) (7,-0.4)--(7,5.3);
 
-  \draw[color=scandiored,decorate] (0,3.7)--(2,3.7)--(3,4.884)--(6,4.884)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.4)--(2,3.4)--(3,4.584)--(6,4.584)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.62)--(2,3.62)--(3,4.804)--(6,4.804)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.65)--(2,3.65)--(3,4.834)--(6,4.834)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.49)--(2,3.49)--(3,4.674)--(6,4.674)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.52)--(2,3.52)--(3,4.704)--(6,4.704)--(7,0);
-  \draw[color=scandiored,decorate] (0,3.6)--(2,3.6)--(3,0);
-  \draw[color=scandiored,decorate] (0,3.23)--(2,3.23)--(3,0);
-  \draw[color=scandiored,decorate] (0,3.83)--(2,3.83)--(3,0);
-  \draw[color=scandioblue,decorate] (2,0)--(3,1.16)--(6,1.16)--(7,4.325)--(8,4.325);
-  \draw[color=scandioblue,decorate] (2,0)--(3,1.18)--(6,1.18)--(7,4.345)--(8,4.345);
-  \draw[color=scandioblue,decorate] (2,0)--(3,1.2)--(6,1.2)--(7,4.365)--(8,4.365);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.165)--(8,3.165);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.18)--(8,3.18);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.2)--(8,3.2);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.15)--(8,3.15);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.1)--(8,3.1);
-  \draw[color=scandioblue,decorate] (6,0)--(7,3.22)--(8,3.22);
+  \draw[color=scandiored] (0,3.15)--(2,3.15)--(3,4.2) plot[domain=0:3] (\x + 3, {3.15 + 1.05*0.85^(\x * 7/3)}) (6,3.487)--(7,0);
+  \draw[color=scandiored] (0,3.15)--(2,3.15)--(3,0);
+
+  \node[color=scandiored,anchor=south] at (1,3.15) { \tiny stable (9x) };
+  \node[color=scandiored,anchor=south west,fill=white] at (2.5,1.55) { \tiny stable (3x) };
+  \node[color=scandiored,anchor=north] at (4.5,4.2) { \tiny stable (6x) };
+
+  \draw[color=scandioblue] (2,0)--(3,1.05) plot[domain=0:3] (\x + 3, {3.15 - 2.1*0.85^(\x * 7/3)}) -- (6,2.477)--(7,4.802)
+  plot[domain=0:3] (\x + 7, {3.15 + 1.652*0.85^(\x * 7/3)});
+  \draw[color=scandioblue] (6,0)--(7,2.324) plot[domain=0:3] (\x + 7, {3.15 - 0.826*0.85^(\x * 7/3)});
+
+  \node[color=scandioblue,anchor=south] at (4.5,1.5) { \tiny canary (3x) };
+  \node[color=scandioblue,anchor=west,fill=white] at (7,2.1) { \tiny canary (6x) };
+
+  \draw[<->] (3,-0.3)--(6,-0.3);
+  \node[fill=white] at (4.5,-0.3) { \scriptsize 7 Tage };
 \end{tikzpicture}
 \end{document}

src/diagrams/future-arch.tex

@@ -0,0 +1,85 @@
+\input{lib/preamble.tex}
+\usepackage{enumitem}
+\setlist{leftmargin=*, itemsep=0.5ex, parsep=0px}
+
+\begin{document}
+\begin{tikzpicture}
+  \node (dev1) at (3,0.5) [component,external] { Gerät 1 };
+  \node (dev2) at (6,0.5) [component,external] { Gerät 2 };
+  \node (devX) at (9,0.5) [component,external] { Gerät \dots };
+  \draw[very thick, rounded corners=6px] (-1.5,2) rectangle (14,9) ++(0, 0.1) node [label, anchor=south east] { \large Heimdall };
+  \fill[color=scandiored!10] (1.5,2.5) rectangle (10.5,4.5);
+  \fill[color=black!10] (2,5) rectangle (10,7);
+  \node (CH1) at (3,3.5) [component] { Connection\\Holder\\ \small Pod 1 };
+  \node (CH2) at (6,3.5) [component] { Connection\\Holder\\ \small Pod 2 };
+  \node (CHX) at (9,3.5) [component] { Connection\\Holder\\ \small Pod \dots };
+  \node (WSM1) at (3,6) [component] { WSM\\ \small Pod 1 };
+  \node (WSM2) at (6,6) [component] { WSM\\ \small Pod 2 };
+  \node (WSMX) at (9,6) [component] { WSM\\ \small Pod \dots };
+  \node (WSM1 port) at (WSM1.30) [port] {};
+  \node at (WSM1 port) [label, below right=3px] { \scriptsize addr1 };
+  \node (WSM2 port) at (WSM2.30) [port] {};
+  \node at (WSM2 port) [label, below right=3px] { \scriptsize addr2 };
+  \node (FORS) at (8,8) [component, inner sep=12px] { FORS }; 
+  \node (Router) at (3,8) [component, inner sep] { Message\\Router };
+  \node (backend1) at (3, 10) [component,external] { Backend 1 };
+  \node (backend2) at (6, 10) [component,external] { Backend 2 };
+  \node (backendX) at (9, 10) [component,external] { Backend \dots };
+
+  \node at (1.8, 7) [stickynote, callout absolute pointer=(Router.190), anchor=east] {
+    \begin{minipage}{2.6cm}
+      \scriptsize\raggedright
+      Dieser Service wartet ggf. auf die Beendigung des Requests zum Backend
+    \end{minipage}
+  };
+  \node at (10.5, 8.5) [stickynote, callout absolute pointer=(WSMX.east), anchor=north west] {
+    \begin{minipage}{2.8cm}
+      \scriptsize\raggedright
+      \begin{itemize}
+        \item Client-Zertifikat: Expiry und Blocklisting
+        \item Websocket-Upgrade
+        \item Corporate Handshake
+        \item Quarantäne
+        \item Nachrichtenformatierung
+      \end{itemize}
+    \end{minipage}
+  };
+  \node at (10.8, 5.5) [stickynote, callout absolute pointer=(CHX.350), anchor=north west] {
+    \begin{minipage}{2.5cm}
+      \scriptsize\raggedright
+      \begin{itemize}
+        \item TCP-Verbindung
+        \item TLS-Terminierung
+        \item Validierung von Client-Zertifikaten ohne Expiry-Timestamp
+      \end{itemize}
+    \end{minipage}
+  };
+
+  \draw (dev1) edge [<->] (CH1)
+        (dev2) edge [<->] (CH2)
+        (devX) edge [<->] (CHX);
+
+  \draw (CH1) edge [<->] node [midway] (CH to WSM) {} (WSM1)
+        (CH2) edge [<->] (WSM2)
+        (CHX) edge [<->] (WSMX);
+
+  \draw (WSM1) edge [->, bend left=10] (Router)
+        (Router) edge [->, response, bend left=10] (WSM1);
+
+  \draw (Router) edge [->, bend left=10] (backend2)
+        (backend2) edge [->, response, bend left=10] (Router);
+
+  \draw (backend2) edge [->, response] (FORS);
+  \draw (FORS) edge [->, response] (WSM1 port);
+
+  \node at (1.4, 6) [stickynote, callout absolute pointer=(CH to WSM.west), anchor=north east] {
+    \begin{minipage}{2.2cm}
+      \scriptsize\raggedright
+      \begin{itemize}
+        \item TCP-Tunnel
+        \item vor Eröffnung des Tunnels wird das validierte Zertifikat mitgesendet
+      \end{itemize}
+    \end{minipage}
+  };
+\end{tikzpicture}
+\end{document}

src/diagrams/websocket.tex

@@ -0,0 +1,37 @@
+\input{lib/preamble.tex}
+
+\begin{document}
+\begin{tikzpicture}
+  \node (Device) at (0,8) [component] { Gerät };
+  \node (WSM) at (10,8) [component] { WSM };
+  \draw (Device) edge [dashed]
+        node[pos=0.1] (TCP1) {}
+        node[pos=0.2] (TLS1) {}
+        node[pos=0.3] (Encrypted1) {}
+        node[pos=0.45] (WSGet1) {}
+        node[pos=0.55] (WSSwitch1) {}
+        node[pos=0.65] (WSComm1) {}
+        node[pos=0.8] (CorpHS1) {}
+        node[pos=0.9] (Exchange1) {}
+        ++(0,-8);
+  \draw (WSM) edge [dashed]
+        node[pos=0.1] (TCP2) {}
+        node[pos=0.2] (TLS2) {}
+        node[pos=0.3] (Encrypted2) {}
+        node[pos=0.45] (WSGet2) {}
+        node[pos=0.55] (WSSwitch2) {}
+        node[pos=0.65] (WSComm2) {}
+        node[pos=0.8] (CorpHS2) {}
+        node[pos=0.9] (Exchange2) {}
+        ++(0,-8);
+  \draw (TCP1.center) edge [->] node [above] {TCP-Verbindung öffnen} (TCP2.center)
+        (TLS1.center) edge [<->] node [above] {TLS-Handshake} node [below] {\small Verschlüsselung und Authentifizierung} (TLS2.center)
+        (Encrypted1.west) edge[dotted, thick] node [fill=white] {\scriptsize (ab hier ist die Kommunikation verschlüsselt)} (Encrypted2.east)
+        (WSGet1.center) edge [->] node [above] {HTTP GET Websocket-Endpunkt} (WSGet2.center)
+        (WSSwitch1.center) edge [<-,dashed] node [above] {101 Switching Protocols} (WSSwitch2.center)
+        (WSComm1.west) edge[dotted, thick] node [fill=white] {\scriptsize (ab hier verläuft die Kommunikation im Websocket-Protokoll)} (WSComm2.east)
+        (CorpHS1.center) edge[<->] node [above] {Corporate Handshake} (CorpHS2.center)
+        (Exchange1.center) edge[<->] node [above] {Austausch von Nachrichten} (Exchange2.center)
+        ;
+\end{tikzpicture}
+\end{document}

src/slides.html

@@ -1,8 +1,8 @@
 <section class="sc-left-and-right" data-background-image="/backgrounds/title.svg">
   <div class="sc-right">
     <img src="/logo_scandio.svg" style="width: 50%;">
-    <h4>Millionen langlebiger TCP-Verbindungen – Herausforderungen und Lösungen bei Update-Prozessen</h4>
-    <div class="sc-gray">31.01.2024</div>
+    <h4>Bleeding Edge - wie man ein Edge-Gateway up-to-date hält</h4>
+    <div class="sc-gray">15.05.2024</div>
   </div>
 </section>
 
@@ -19,80 +19,97 @@
     </div>
 </section>
 
+<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
+  <h2 style="margin: 48px;">Über Scandio</h2>
+  <center class="r-stretch" style="display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 36px; justify-items: center;">
+    <img src="consulting.png" style="height: 200px;">
+    <img src="development.png" style="height: 200px;">
+    <img src="operations.png" style="height: 200px;">
+    <small>
+      <b>CONSULTING</b>
+      <p>
+        Wir analysieren und beraten; von Cloud-Architektur über agile Beratung bis hin zu Migrationen in die Atlassian Cloud.
+      </p>
+    </small>
+    <small>
+      <b>DEVELOPMENT</b>
+      <p>
+        Webanwendungen oder Softwarearchitektur, IoT oder Data Science: unsere Teams decken jeden Aspekt von agiler
+        Softwareentwicklung ab.
+      </p>
+    </small>
+    <small>
+      <b>SYSTEMS ENGINEERING</b>
+      <p>
+        Mit Best Practices aus dem DevOps-Bereich and agilen Methoden entwicken unsere Teams maßgeschneiderte
+        Cloud-Architekturen.
+      </p>
+    </small>
+  </center>
+  <p style="margin: 48px;"><a href="https://www.scandio.de/">www.scandio.de</a></p>
+</section>
+
 <section data-background-color="black">
   Projektsetup
 </section>
 
 <section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
   <h2>Heimdall</h2>
-  <ul>
-    <li class="fragment">Gateway zwischen IoT-Geräten und verschiedenen Backends</li>
-    <li class="fragment">Entwickelt seit 2018</li>
-    <li class="fragment">Ablösung eines vollständig extern verwalteten Systems</li>
-  </ul>
+  <img src="/heimdall-bifrost.jpg" style="width: 45%;">
 </section>
 
 <section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h2>Fachlicher Kontext</h2>
   <center>
     <img src="/diagrams/business_context.svg" style="width: 600px;">
   </center>
 </section>
 
-<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h2>Qualitätsanforderungen</h2>
-  <ul>
-    <li class="fragment">Vermeidung von Verbindungsabbrüchen</li>
-    <li class="fragment">Wenige Neuverbindungen zur gleichen Zeit</li>
-    <li class="fragment">Keine Validierung oder Modifikation von Nachrichteninhalten</li>
-    <li class="fragment">Verbindungsdetails transparent gegenüber Backends</li>
-  </ul>
-</section>
-
 <section data-background-color="black">
   Problemstellung
 </section>
 
-<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h2>Systemupdate</h2>
-  <ul>
-    <li class="fragment">Updates an der Logik und Konfiguration von Heimdall</li>
-    <li class="fragment">Vermeidung von Neuverbindungen in den meisten Fällen</li>
-    <li class="fragment">Kontrollierte Neuverbindungen, falls Verbindungsabbrüche notwendig</li>
-  </ul>
-</section>
-
 <section data-background-color="black">
   Lösungen
 </section>
 
-<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h3>Softwarearchitektur Heimdall</h3>
-  <center class="r-stack">
-    <img class="diagram fragment fade-out" data-fragment-index="1" src="/diagrams/arch1.svg">
-    <img class="diagram fragment fade-in-then-out" data-fragment-index="1" src="/diagrams/arch2.svg">
-    <img class="diagram fragment fade-in-then-out" src="/diagrams/arch3.svg">
-    <img class="diagram fragment fade-in-then-out" src="/diagrams/arch4.svg">
-    <img class="diagram fragment fade-in-then-out" src="/diagrams/arch5.svg">
-  </center>
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/arch1.svg">
 </section>
 
 <section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
-  <img class="r-stretch" src="/diagrams/arch6.svg">
+  <img class="diagram" src="/diagrams/arch2.svg">
 </section>
 
-<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h3>Deploymentstrategie</h3>
-  <center class="r-stack">
-    <img class="diagram fragment fade-out" data-fragment-index="1" src="/diagrams/deployment1.svg">
-    <img class="diagram fragment fade-in-then-out" data-fragment-index="1" src="/diagrams/deployment2.svg">
-    <img class="diagram fragment fade-in-then-out" src="/diagrams/deployment3.svg">
-    <img class="diagram fragment fade-in-then-out" src="/diagrams/deployment4.svg">
-  </center>
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/arch3.svg">
 </section>
 
-<section data-background-image="/backgrounds/normal.svg" data-background-position="top right">
-  <h3>Ideen zur Verbesserung</h3>
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/arch4.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/arch5.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/arch6.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/deployment1.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/deployment2.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/deployment3.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right">
+  <img class="diagram" src="/diagrams/deployment4.svg">
 </section>
 
 <section class="sc-left-and-right" data-background-color="black">
@@ -106,3 +123,38 @@
   </div>
 </section>
 
+<section data-background-color="black" data-visibility="uncounted">
+</section>
+
+<section data-background-color="black" data-visibility="uncounted">
+  Ideen und Wünsche
+</section>
+
+<section data-background-image="/backgrounds/normal.svg" data-background-position="top right" data-visibility="uncounted">
+  <h2>Aufgaben des WSM</h2>
+  <ul>
+    <li class="fragment">TLS</li>
+    <li class="fragment">Websocket-Upgrade</li>
+    <li class="fragment">Corporate Handshake</li>
+    <li class="fragment">Message Routing</li>
+    <li class="fragment">Quarantäne</li>
+    <li class="fragment">Kleinere spezifische Workarounds</li>
+  </ul>
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right" data-visibility="uncounted">
+  <img class="r-stretch" src="/diagrams/websocket.svg" style="margin: 60px;">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right" data-visibility="uncounted">
+  <img class="r-stretch" src="/diagrams/future-arch.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right" data-visibility="uncounted">
+  <img class="r-stretch" src="/diagrams/connection-holder-runtime.svg">
+</section>
+
+<section data-background-image="/backgrounds/normal-fewer-hexagons.svg" data-background-position="top right" data-visibility="uncounted">
+  <img class="r-stretch" src="/diagrams/connection-holder-internal.svg">
+</section>
+

theme/scandio.scss

@@ -12,7 +12,7 @@
 @import "./colors";
 
 // Include theme-specific fonts
-@import url(https://fonts.googleapis.com/css?family=Raleway:900|Roboto:300);
+@import url(https://fonts.googleapis.com/css?family=Raleway:900|Roboto:300,700);
 
 
 // Override theme settings (see ../template/settings.scss)