On 24/02/2013, at 11:38 AM, russell <russ...@dotplan.dyndns.org> wrote:
> On 02/24/2013 11:32 PM, David Gwynne wrote:
>> what are you using the rewrite stuff for?
>>
> netbooting.
me too!
we unconditionally netboot all our labs (and most of our staff machines). by
default we want netboot to fall out back to booting off the disk, but if we
want to push a new image we click stuff on a webpage and the netboot config
gets pointed at alternate config that reimages the machine.
it is kind of fun to wol a lab of 60 machines and have them pxeboot
simultaneously. ive seen tftpd push over 50MB/s in situations like that.
dlg
>
> pxeboot is unable to pick a kernel based on machine.
> and as I run an oddball mix of current/stable
> i386/amd64 (and sparc64 but it does not count as ofwboot.net does specify
> kernel)
>
> so I use tftpd rewrite rules to load the correct kernel.
>
> I use my constantly growing collection of old machines sort of in the manner
> you would use a vm.
> copy tree, send wol, have new server.
>
> In all honesty it is sort of stupid, but I am having fun setting it up.
>
> And just for grins and giggles this is what I am using to rewrite
> I am sure my inexperience shows but it is good to learn somthing new
>
> #!/usr/local/bin/python
> #rewrite tftp requests
> import socket, os
> tftpd_rewrite_address = '/var/run/tftpd.sock'
> tftpd_rewrite_address = '/tmp/tftpd.sock'
> tftpd_base = '/tftpboot'
> if os.path.exists(tftpd_rewrite_address):
> os.unlink(tftpd_rewrite_address)
> listen_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
> listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
> listen_socket.bind(tftpd_rewrite_address)
> listen_socket.listen(1)
> tftpd_socket, addr = listen_socket.accept()
> REQUEST_ADDR = 0
> REQUEST_CMD = 1
> REQUEST_FILE = 2
> cmd_list = ['quit']
> cmd = ''
> while cmd != 'quit':
> tftp_request = tftpd_socket.recv(1024)
> for request in tftp_request.strip().split('\n'):
> if request in cmd_list:
> cmd = request
> else:
> request_data = request.split(' ', 3)
> if len(request_data) == 3:
> response = request_data[REQUEST_FILE] + '\n'
> host_name = socket.gethostbyaddr(request_data[REQUEST_ADDR])
> short_name = host_name[0].split('.')[0]
> if os.path.isdir(os.path.join(tftpd_base, short_name)):
> if os.path.isabs(response):
> response = response[1:] #remove leading /
> short_name = '/' + short_name
> response = os.path.join(short_name, response)
> send_size = tftpd_socket.send(response)
>
> tftpd_socket.close()
> listen_socket.close()
