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ArchitectureGroup

Thanks for many helpful hints from Corrado Santoro.

Introduction

Etherboot 4.0 downloads a boot image using the TFTP protocol. A TFTP service must be running on at least one machine on your network. Etherboot 4.0 is part of the non-Java development tools for JJOS/decaf.

Linux

What is the connection between Linux and JJOS? JJOS is compiled with the Linux compiler. The JJOS/decaf boot image is jjos-nbi and is installed in /tftpboot.

On a JOS machine, the jjos-nbi boot image is typically downloaded across the network from a TFTP service running on that Linux machine.

Testing

Before booting your first JOS machine, make sure the TFTP service is running. You should test the TFTP service, like this:

prompt# cd /home/<EM>user</EM>
prompt# tftp
tftp> connect localhost
tftp> binary
tftp> get jjos-nbi
:
tftp> quit
prompt#

Transfer time out

If you get a transfer time out message, your machine is not running the TFTP service. You will need to configure it for TFTP.

Configuring TFTP

When a TFTP request is made at port 69/udp, the inetd program runs the tpcd program. In turn, the tcpd program runs the in.tftp program. In turn, the in.tftp program runs the real in.tftp program.

The real in.tftp program provides the TFTP service. The tcpd program provides additional security for TCP/UDP services, like TFTP. Your Linux machine should use the inetd daemon to start TFTP automatically when it is used.

Inside your /etc/inetd.conf file, your TFTP service is typically disabled, like this:

#tftp  dgram  udp  wait  nobody  /usr/sbin/tcpd  in.tftp

To enable TFTP,

1. Remove the comment character (#) from the beginning of this line. It should look like this:

   tftp  dgram  udp  wait  nobody  /usr/sbin/tcpd  in.tftp
   

   or this:

   tftp  dgram  udp  wait  root  /usr/sbin/tcpd  in.tftp
   

2. Restart your inetd service.

   This step is important for your configuration changes to go into effect.

Default

By default, the in.tftp program reads files from the /tftpboot directory.

To create the /tftpboot directory,

1. Log in as root.

2. Create the directory with something like

   mkdir /tftpboot
   

3. Change permissions on /tftpboot directory to -rwxr-xr-x with something like

   chmod ugo+rx /tftpboot
   

4. Log out as root.

   
   
   

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