net/http/pprof over UNIX sockets

[Albert Strasheim]

Hello all

Sometimes when you have many services, it can be hard to pick port numbers where you want to expose net/http/pprof info. And sometimes you don't want to expose this info outside your server (you can set up a firewall, of course).

On Linux, another option is to use UNIX sockets with abstract paths containing the process PID instead:

Call the following function from your main:

func ListenPprof() {

path := "@/pprof/" + strconv.Itoa(os.Getpid())

l, err := net.Listen("unix", path)

if err != nil {

panic(err)

}

mux := http.NewServeMux()

mux.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))

mux.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))

mux.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))

mux.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))

// ignore errors from Serve

go http.Serve(l, mux)

}

and then do

echo -e "GET /debug/pprof/goroutine?debug=2 HTTP/1.1\n" | socat STDIO ABSTRACT:/pprof/<pid>

This seems to work well for everything except the CPU profiles, but that's probably a socat issue I haven't figured out yet.

Maybe this is useful for someone.

Cheers

Albert