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cicd/cicd.md
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# CI/CD at TrackCode
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### Using Jenkins, Helm and Kubernetes
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---
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### Content
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- About me
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- Definition of CI/CD
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- Existing Stack
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- Implementation
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- Pros and Cons
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- Whats next?
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---
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### About me
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Julian Tölle
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Developer @ <span style="color: #e74c3c">narando</span> & <span style="color: #f2f2f2">TrackCode</span>
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Backend Development & Devops
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---
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### Definition of CI/CD
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#### Continuous Integration
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> Continuous Integration (CI) is a development practice that requires
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> developers to integrate code into a shared repository several times a day.
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>
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> Each check-in is then verified by an automated build, allowing teams to
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> detect problems early.
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<small>From [ThoughWorks](thoughtworks.com/continuous-integration)</small>
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--
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### Definition of CI/CD
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#### Continuous Delivery
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> Continuous Delivery (CD) is a software development discipline where you build
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> software in such a way that the software can be released to production at any
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> time.
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<small>From [Martin Fowler](https://martinfowler.com/bliki/ContinuousDelivery.html)</small>
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--
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### Definition of CI/CD
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#### Summary
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- Merge often
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- Test everything
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- Deploy quickly
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---
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### Existing Stack
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- Bitbucket Server
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- Jenkins
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- Dedicated machines for each service
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--
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### Existing Stack
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#### Jenkins
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- Seperate jobs per service instance and environment
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- Polling for SCM changes
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- Freestyle jobs executing shell:
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```bash
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rsync -avz . jenkins@SERVICE-MACHINE:/var/www/
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ssh jenkins@SERVICE-MACHINE "./deploy.sh production"
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```
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--
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### Existing Stacks
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#### Pain Points
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- Configuration only in Jenkins
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- No hermetic builds
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- Deploying means capacity reduction
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- Only application, no infrastructure
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---
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### Implementation
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#### Premise
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<table>
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<tr>
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<td>Deployment Target</td>
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<td>Kubernetes</td>
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</tr>
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<tr>
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<td>Build Tool</td>
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<td>Jenkins</td>
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</tr>
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</table>
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--
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### Implementation
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#### Workflow
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1. Make changes and commit
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1. Create PR from feature branch to `master`
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1. Automatic tests and linting provide inline feedback
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1. Code Review from peers
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1. Act upon test and review feedback
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1. Merge
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1. Deployment is triggered
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--
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### Implementation / Build
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- Triggered by Webhook
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- On every push/pr
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- Steps defined in `Jenkinsfile`
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- Build defined in `Dockerfile`
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--
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### Implementation / Build
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#### Jenkinsfile Build Steps
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 <!-- .element height="66%" width="66%" -->
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--
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### Implementation / Build
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#### Jenkins Blue Ocean UI
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--
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### Implemenation / Deployment
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- Defined in same `Jenkinsfile`
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- Executed when `branch IN (master, dev)`
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--
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### Implementation / Deployment
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#### Helm
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- Incubating CNCF Project
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- "Package Manager for Clusters"
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- CLI Tool (`helm`) and in-cluster Operator (`tiller`)
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- Only used for templating
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- Alternatives: ksonnet, kubetpl, ...
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--
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### Implementation / Deployment
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#### Helm Workflow
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- Render Helm Chart to Kubernetes Manifest
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- Apply Manifest against cluster
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- ???
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- Profit!
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--
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### Implementation / Deployment
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#### Folder Structure
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```
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app-web
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└── ops
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├── chart
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│ ├── Chart.yaml
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│ ├── templates
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│ │ ├── configmap.yaml
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│ │ ├── deployment.yaml
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│ │ ├── _helpers.tpl
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│ │ ├── ingress.yaml
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│ │ └── service.yaml
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│ └── values.yaml
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└── nginx
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└── default.conf
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```
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--
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### Implementation / Deployment
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#### Jenkinsfile Deploy Steps
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---
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## Pros and Cons
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### Pros
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- Explicit, reviewed, tracked configuration
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- Infrastructure also deployed
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- Clean builds
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- Every commit/pr is build
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--
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## Pros and Cons
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### Cons
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- Dependency on local tools
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- `kubectl`, `helm`, `docker`, `npm`, `node`
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- Leftover build artifacts
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- Groovy is more verbose than necessary
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- Missing clean up of orphaned k8s resources
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---
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### Whats next?
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- Container native build tools
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- e.g. Drone.io, Jenkins X, Concourse
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- explicit tool dependencies
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- built-in docker garbage collection
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- Helm v3
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- deprecation of `tiller` in favor of `CRDs`
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- still allowing clean up of orphaned resources
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cicd/index.html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
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<title>CI/CD at TrackCode</title>
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<link rel="stylesheet" href="../reveal/css/reveal.css">
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<link rel="stylesheet" href="../reveal/css/theme/moon.css" id="theme">
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<link rel="stylesheet" href="../reveal/lib/css/atom-one-dark.css">
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<link rel="shortcut icon" href="favicon.png">
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<style>
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@import url(https://cdn.rawgit.com/tonsky/FiraCode/1.204/distr/fira_code.css);
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.reveal code {
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font-family: 'Fira Code', monospace;
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}
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</style>
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</head>
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<body>
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<div class="reveal">
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<div class="slides">
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<!-- Use external markdown resource, separate slides by three newlines; vertical slides by two newlines -->
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<section data-markdown="cicd.md" data-separator-vertical="^\n--\n$"></section>
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</div>
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</div>
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<script src=" ../reveal/lib/js/head.min.js "></script>
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<script src="../reveal/js/reveal.js "></script>
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<script>
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Reveal.initialize({
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controlsTutorial: false,
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center: false,
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history: true,
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// Optional libraries used to extend on reveal.js
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dependencies: [
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{ src: '../reveal/lib/js/classList.js', condition: function () { return !document.body.classList; } },
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{ src: '../reveal/plugin/markdown/marked.js', condition: function () { return !!document.querySelector('[data-markdown]'); } },
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{ src: '../reveal/plugin/markdown/markdown.js', condition: function () { return !!document.querySelector('[data-markdown]'); } },
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{ src: '../reveal/plugin/highlight/highlight.js', async: true, callback: function () { hljs.initHighlightingOnLoad(); } }
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]
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});
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</script>
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</body>
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</html>
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