{"id":3093,"date":"2017-01-17T12:59:49","date_gmt":"2017-01-17T12:59:49","guid":{"rendered":"http:\/\/www.nikola-breznjak.com\/blog\/?p=3093"},"modified":"2017-01-18T21:25:32","modified_gmt":"2017-01-18T21:25:32","slug":"dockerize-simple-go-app","status":"publish","type":"post","link":"https:\/\/nikola-breznjak.com\/blog\/go\/dockerize-simple-go-app\/","title":{"rendered":"How to dockerize a simple Go app"},"content":{"rendered":"

In this tutorial, I’m going to show you how to dockerize a simple app (written in Go) that shows the current time. Github repo is here<\/a>, in case you’re interested.<\/p>\n

Dockerfile<\/h2>\n

So, if you haven’t played with Docker before, official docs<\/a> would be a good start.<\/p>\n

For our Go app, we need to create a file named Dockerfile<\/code> with the following content:<\/p>\n

FROM golang:onbuild\nEXPOSE 8080\n<\/code><\/pre>\n
Go code<\/h2>\n
As for our app, the code is rather short and simple:<\/p>\n
package main\n\nimport (\n    \"fmt\"\n    \"net\/http\"\n    \"time\"\n)\n\nfunc main() {\n    http.HandleFunc(\"\/\", handler)\n    http.ListenAndServe(\":8080\", nil)\n}\n\nfunc handler(w http.ResponseWriter, r *http.Request) {\n    curTime := time.Now().Format(\"02.01.2006 15:04:05\")\n\n    fmt.Fprintf(w, \"%s\", curTime)\n}\n<\/code><\/pre>\n
If you haven’t played with Go before, official docs<\/a> would be a good place to start.<\/p>\n
The only important thing to note here is that we’re listening on port 8080, which we need to set in the Dockerfile through EXPOSE<\/code>.<\/p>\n
Steps on how to make this yourself<\/h2>\n
Go code<\/h3>\n