It looks like you have a comprehensive guide on using Docker multi-stage builds to optimize your Go application. Let's break down each part of this example, ensuring clarity and completeness.
Step-by-Step Guide
1. Application Code (main.go)
Your main.go file sets up a simple HTTP server that responds with the version number passed as an environment variable:
go1package main 2 3import ( 4 "fmt" 5 "log" 6 "net/http" 7 "os" 8) 9 10func main() { 11 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { 12 appVersion := os.Getenv("APP_VERSION") 13 if appVersion == "" { 14 appVersion = "unknown" 15 } 16 fmt.Fprintf(w, "Hello from Go, version %s!\n", appVersion) 17 }) 18 19 port := os.Getenv("PORT") 20 if port == "" { 21 port = "8080" 22 } 23 log.Printf("Server starting on port %s...", port) 24 log.Fatal(http.ListenAndServe(":"+port, nil)) 25}
2. Dockerfile
Your Dockerfile is divided into two stages: a build stage and a release/runtime stage.
Build Stage
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