How to properly manage configuration in Go: env, flags or files?

Hi everyone! I'm new to Go and trying to figure out how to properly store application settings. I started writing a small web server, and I ran into a problem: I want the application to be configurable without recompilation — to change the port, database connection string, logging level. So far I'm doing this: I create a config package where I read environment variables in init(). But this seems like a hack, especially when there are many settings (about 20). Plus I don't know how to set default values and how to conveniently pass the config to other packages. Here's my current code: ```go package config import "os" var Port string var DBHost string func init() { Port = os.Getenv("PORT") if Port == "" { Port = "8080" } DBHost = os.Getenv("DB_HOST") if DBHost == "" {