lrwxrwxrwx 1 root root 12 Jul 22 21:04 /dev/random -> /dev/urandom

package main

import (
    "fmt"
    "os"
)

func main() {

    f, err := os.Open("/dev/random")
    if err != nil {
        panic(err)
    }

    chunk := make([]byte, 1024)
    index := 0
    for {
        index = index + 1
        _, err := f.Read(chunk)
        if err != nil {
            panic(err)
        }
        fmt.Println("iteration ", index)
    }
}

docker run -it --rm -v /dev/random:/dev/random bla