Golang package to daemonize server application

Create new daemon

func main(){
    if len(os.Args) < 2 {
        return
    }

    err := daemon.Init(os.Args[0], map[string]interface{}{}, "./app.pid")
    if err != nil {
        return
    }

    var cmd string
    if len(os.Args) > 1 {
        cmd = os.Args[1]
    }
    
    switch cmd {
    case "start":
        err = daemon.Start()
    case "stop":
        err = daemon.Stop()
    case "restart":
        err = daemon.Stop()
        err = daemon.Start()
    case "status":
        status := "stopped"
        if daemon.IsRun() {
            status = "started"
        }
    
        fmt.Printf("Application is %s\n", status)
    
        return
    case "":
		fallthrough
    default:
        mainLoop()
    }
}

func mainLoop(){
    for {
        log.Println("I'm daemon")
        time.Sleep(time.Minute)
    }
}

To start the script as daemon to need:

$ go build -o daemon.app

$ ./daemon.app start

To stop:

$ ./daemon.app stop

To restart:

$ ./daemon.app restart

To show status:

$ ./daemon.app status

You may see the code in this example.

Create new daemon with full code control

In the case to start to need just compile code and run as usual: $ go build -o daemon.app $ ./daemon.app

NB The script starts as daemon from beginning and will be stopped after 1 minute.

List all methods

• daemon.Init - initializes daemon
• daemon.Start - to daemonize script
• daemon.Stop - to stop of daemonization
• daemon.IsRun - returns flag of the running
• daemon.RemovePIDFile() - removes autocreated PID file