Go as a Tooling Language for the Cloud

There is ‚as Code’ for everything! We use CloudFormation or Terraform for Infrastructure as Code, various different file formats for Pipeline as Code and of course describe our application definitions as code with Helm Charts. Usually lots of copy’n paste and bash script is necessary to spin up another environment for your application. With Go you have the ease of using just your command line combined with the power of a strongly typed language with official libraries for nearly every cloud service you can think of. The only requirement to start developing is your favorite text editor and the Go compiler. In this talk you will learn how to use the programming language most of your favorite cloud tools are made of, to write small and easy to use customized command line tools. We will take a look at Go and its built-in features like the templating engine, concurrency and static compilation to do repetitive tasks much more efficiently and less error prone.

Transcript

1. Jannis Schaefer | cosee jannis.schaefer@cosee.biz | @jannisschaefer How Go can save a DevOps day It’s all about your tooling
2. Jannis Schaefer | cosee jannis.schaefer@cosee.biz | @jannisschaefer How Go can save a DevOps day It’s all about your tooling We are Cloud Native!
3. Jannis Schaefer | cosee jannis.schaefer@cosee.biz | @jannisschaefer How Go can save a DevOps day It’s all about your tooling A tailor-made team for your needs! Cloud Backend Mobile Frontend DevOps Agile Marketing Design
4. Why script when you could Go? • Clean syntax = No magic™ • Concurrency in mind • Powerful tooling • Quickly compiled to assembly • Static binaries for all mayor platforms • Garbage Collection medium.com/@kevalpatel2106/why-should-you-learn-go-f607681fad65
5. Feels like home > go run main.go
6. Standard Library https://golang.org/pkg/#stdlib archive bufio compress context crypto database/sql encoding errors expvar flag fmt html image io log math net/http net net/mail os path reflect regexp sort strings testing text text/template time encoding/json encoding/xml
7. Everything is a library github.com/gin-gonic/gin
8. Typed / generated clients k8s.io/client-go aws/aws-sdk-go docker/client googleapi/google-api-go-client
9. Looking for the perfect lib? https://github.com/avelino/awesome-go
10. > go get $CLI_TOOL
11. git config !--global url."git@github.com:".insteadOf "https:!//github.com/" Free #1 Stackoverflow Answer > go get $PRIVATE_REPO
12. How to start Going?
13. Whaaat? No classes?
14. At least we have interfaces
15. When things Go wrong
16. Multiple return values?
17. Close files reliable with defer
18. Test all the things! $ stuff_test.go
19. Go concurrent
20. Goroutines - Fire and forget?
21. We need to talk. - channels
22. Example: channels
23. % Example: Worker pattern & ' gobyexample.com/worker-pools
24. Receiving isn’t always a blocker
25. Things you need to Go • Go installation from golang.org/dl/ • Some text editor or IDE (VSCode, GoLand, vim) • Built-in tools you heard of today
26. Let’s Go… Sourcecode: github.com/schjan/image-converter
27. Go for what? • Server applications and micro services • http/2 support built-in • small size Docker containers
 • CLI tools for different platforms & Automatization • Easy cross compilation • Official library for almost every cloud service
28. Where to Go now? Effective Go „Offical Guide“ golang.org/doc/effective_go.html Links to learning resources github.com/golang/go/wiki/Learn Small code examples gobyexample.com Awesome contributed libraries github.com/avelino/awesome-go Democode github.com/schjan/image-converter
29. Jannis Schaefer | cosee GmbH jannis.schaefer@cosee.biz | @jannisschaefer > blog.cosee.biz > jobs.cosee.biz > cosee.biz github.com/ashleymcnamara/gophers