@Deepak Chokkadi

This is the function that I use:

def mountBucket(dstBucketName:String, dstMountName:String) {
  import java.lang.IllegalArgumentException
  val accessKey = "YOUR ACCESS KEY"
  val encodedSecretKey = "YOUR SECRET".replace("/", "%2F")
  try {
    dbutils.fs.mount(s"s3a://$accessKey:$encodedSecretKey@$dstBucketName", dstMountName) 
    println("All done!")
  } catch {
    case e: java.rmi.RemoteException => {
      println("Directory is Already Mounted")
      dbutils.fs.unmount(dstMountName)
      mountBucket(dstBucketName, dstMountName)
    }
    case e: Exception => {
      println("There was some other error")
    }
  }
}

I've put it in a simple accessible notebook, then just run that notebook using %run. Then to mount a bucket I use that function and it automatically remount it.