Subject:
Re: [Proposal] PXE Server HOWTO
From:
Charles Curley ####@####.####
Date:
27 Jan 2002 04:57:56 -0000
Message-Id: <20020126210855.B23095@trib.com>
On Sun, Jan 27, 2002 at 01:20:55AM +0100, Jason Bechtel wrote:
> On Sat, 26 Jan 2002 13:52:47 -0700
> Charles Curley ####@####.#### wrote:
> > On Sat, Jan 26, 2002 at 07:25:32PM +0100, Jason Bechtel
> > wrote:
> > > <http://etherboot.sourceforge.net>
> > > <http://www.ltsp.org>
> >
> > Cool! One could use this to boot a full Linux disty,
> > which is what the authors intend.
>
> The authors of PXE?
Sorry, no, I meant the LTSP folks. And I was incorrect. They are after
the diskless workstation, as you point out below.
You could, you know. Boot the kernel, mount everything over NFS,
including /home, and let any user log in to any diskless workstation.
The user would have a full up Linux disty available at Ethernet
speeds. You might have to keep a local RAM disk for some stuff, and
having /tmp in local RAM would be possible. You would have no hard
drive locally and universal access to one's account. This is much
better than NT domains.
>
> The LTSP project works using PXE+Etherboot (or just
> Etherboot) to load a Linux kernel over the network, not a
> full distro. The code in the network card's EEPROM (or on a
> floppy) contacts a DHCP server (or a bootp server) to obtain
> its network information (based on its MAC address). Then
> the DHCP/bootp response contains the location of the kernel
> to download (tftp server name + path), which is then
> downloaded and booted.
Believe me, I'm familiar with bootp. :-) The bootp server provides an
executable; it does not have to be a kernel. It could be a second
stage bootstrap, manufacturing test code, manufacturing OS
installation code, or anything else you can compile or assemble for
the target.
>
> If PXE was involved at all, it has now served its purpose
> and is out of the picture. Now, once you boot this
> specially prepared kernel, it again contacts DHCP/bootp for
> its network information (at least it used to need to do
> this; LTSP 3.0 may avoid this, not sure).
I don't think it should avoid it because the bootp server may assign
a temporary address/netmask/gateway/hostname, and the downloaded
executable may "know" its permanent assignments.
> Now the kernel mounts its root filesystem over NFS (see the NFS-Root
> mini-HOWTO, recently reclaimed) and continues to boot, according to
> data stored on the NFS server... Finally, init is executed as the
> first process and again according to the inittab file on the server,
> it either starts a telnet session in console mode or it launches X
> and establishes a XDMCP connection to the applications server.
In other words, once bootp has delivered its executable it's a normal
Unix boot process - assuming it was a Unix kernel bootp delivered.
>
> Sorry for the speech, but I think that LTSP really is
> amazing. The implications for TCO and ongoing maintenance
> costs are staggering. Microsoft should be quaking in their
> boots!
Quite right.
--
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The world's most effective anti-virus software: Linux.
Looking for fine software and/or web pages?
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<type 'exceptions.IOError'> | Python 2.5.2: /usr/bin/python
Mon Jul 1 15:30:03 2024 |
A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.
| /opt/ezmlm-browse-0.20/main.py in main() |
424
|
425 if path is not None:
|
426 main_path(path)
|
427 else:
|
428 main_form()
|
| global main_form = <function main_form at 0x88d5c6c> |
| /opt/ezmlm-browse-0.20/main.py in main_form() |
378 except ImportError:
|
379 die(ctxt, "Invalid command")
|
380 module.do(ctxt)
|
381
|
382 def main():
|
| module = <module 'commands.showmsg' from '/opt/ezmlm-browse-0.20/commands/showmsg.pyc'>, module.do = <function do at 0x88f3294>, global ctxt = {'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'} |
| /opt/ezmlm-browse-0.20/commands/showmsg.py in do(ctxt={'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}) |
18 write(html('msg-pager') % ctxt)
|
19 write('<hr>')
|
20 sub_showmsg(ctxt, ctxt[MSGNUM])
|
21 write('<hr>')
|
22 write(html('msg-pager') % ctxt)
|
| global sub_showmsg = <function sub_showmsg at 0x88d51ec>, ctxt = {'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, global MSGNUM = 'msgnum' |
| /opt/ezmlm-browse-0.20/globalfns.py in sub_showmsg(ctxt={'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, msgnum=2196) |
229 format_timestamp(ctxt, ctxt)
|
230 write(html('msg-header') % ctxt)
|
231 rec_showpart(ctxt, msg, 0)
|
232 write(html('msg-footer') % ctxt)
|
233 ctxt.pop()
|
| global rec_showpart = <function rec_showpart at 0x88d51b4>, ctxt = {'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, msg = <email.message.Message instance at 0x895016c> |
| /opt/ezmlm-browse-0.20/globalfns.py in rec_showpart(ctxt={'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, part=<email.message.Message instance at 0x895016c>, partnum=1) |
205 else:
|
206 for p in part.get_payload():
|
207 partnum = rec_showpart(ctxt, p, partnum+1)
|
208 else:
|
209 write(html('msg-sep') % ctxt)
|
| partnum = 1, global rec_showpart = <function rec_showpart at 0x88d51b4>, ctxt = {'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, p = <email.message.Message instance at 0x895036c> |
| /opt/ezmlm-browse-0.20/globalfns.py in rec_showpart(ctxt={'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, part=<email.message.Message instance at 0x895036c>, partnum=2) |
208 else:
|
209 write(html('msg-sep') % ctxt)
|
210 sub_showpart(ctxt, part)
|
211 return partnum
|
212
|
| global sub_showpart = <function sub_showpart at 0x88d5144>, ctxt = {'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, part = <email.message.Message instance at 0x895036c> |
| /opt/ezmlm-browse-0.20/globalfns.py in sub_showpart(ctxt={'cmd': 'showmsg', 'threadidx': 11, 'HTTP_X_FORW...HTTP_ACCEPT_ENCODING': 'gzip, br, zstd, deflate'}, part=<email.message.Message instance at 0x895036c>) |
164 type = ctxt[TYPE] = part.get_content_type()
|
165 ctxt[FILENAME] = part.get_filename()
|
166 template = html('msg-' + type.replace('/', '-'))
|
167 if not template:
|
168 template = html('msg-' + type[:type.find('/')])
|
| global template = <function template at 0x88cde9c>, global html = <function html at 0x88cded4>, type = 'application/pgp-signature', type.replace = <built-in method replace of str object at 0x894f8a8> |
| /opt/ezmlm-browse-0.20/globalfns.py in html(name='msg-application-pgp-signature') |
40
|
41 def html(name):
|
42 return template(name + '.html')
|
43
|
44 def xml(name):
|
| global template = <function template at 0x88cde9c>, name = 'msg-application-pgp-signature' |
| /opt/ezmlm-browse-0.20/globalfns.py in template(filename='msg-application-pgp-signature.html') |
31 except IOError:
|
32 if not _template_zipfile:
|
33 _template_zipfile = zipfile.ZipFile(sys.argv[0])
|
34 try:
|
35 f = _template_zipfile.open(n).read()
|
| global _template_zipfile = None, global zipfile = <module 'zipfile' from '/usr/lib/python2.5/zipfile.pyc'>, zipfile.ZipFile = <class zipfile.ZipFile at 0x8866a7c>, global sys = <module 'sys' (built-in)>, sys.argv = ['-c', '/opt/ezmlm-browse-0.20'] |
| /usr/lib/python2.5/zipfile.py in __init__(self=<zipfile.ZipFile instance at 0x88dfe8c>, file='-c', mode='r', compression=0, allowZip64=False) |
337 self.filename = file
|
338 modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'}
|
339 self.fp = open(file, modeDict[mode])
|
340 else:
|
341 self._filePassed = 1
|
| self = <zipfile.ZipFile instance at 0x88dfe8c>, self.fp = None, builtin open = <built-in function open>, file = '-c', modeDict = {'a': 'r+b', 'r': 'rb', 'w': 'wb'}, mode = 'r' |
<type 'exceptions.IOError'>: [Errno 2] No such file or directory: '-c'
args =
(2, 'No such file or directory')
errno =
2
filename =
'-c'
message =
''
strerror =
'No such file or directory'
