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CPU example usage

This document describes an example use of the cpu command.

Introduction

The cpu command allows you to log in to a remote system (in this case RTE) and mount parts of your host file system so that they are visible as if they were part of the remote system. This allows you to execute programs present in your local system in the remote environment without having to install them there. Another use case is executing minicom on RTE and storing the logs on your host PC without having to scp them and without worrying about RTE running out of space. This use case is demonstrated in this document.

Prerequisites

  • RTE with system version 0.7.4 or later connected to your local network
  • Some bootable platform connected to the RTE via serial
  • The cpu command installed on your host PC

Using cpu

This section describes how to use the cpu command to execute minicom on RTE and store the logs on your host PC without them ever appearing on the RTE. As mentioned in the introduction, the main advantage of this approach are that you do not have to fear running out of storage place. Also, it saves time in case you prefer to analyze the logs on your local machine.

First you must generate an SSH key pair on your host.

$ ssh-keygen
Generating public/private rsa key pair
Enter file in which to save the key

Store it wherever you would like. In this example it is saved as ~/.ssh/key. Next, send the public key to the RTE. You can use scp to do it.

$ scp ~/.ssh/key.pub root@<rte_ip>:.ssh

The key will appear on RTE under /home/root/.ssh/key.pub.

Then you must access the RTE and run cpud, which will listen for incoming connections. Make sure that the RTE is in your local network because cpu utilizes SSH.

(rte)# cpud -pk /home/root/.ssh/key.pub

On your host PC navigate to your working directory and run minicom using cpu.

$ cpu -key ~/.ssh/key -namespace /home <rte_ip> /usr/bin/minicom -D <dev>  -b <baud rate> -C capturefile

minicom should open. Boot the platform that is connected to the RTE. You will see the output from the platform. When you're finished, close minicom. The capture file will appear on the host instead of the RTE.