Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-18 Thread Martin Langhoff 
On Sun, Jan 16, 2011 at 9:21 PM, Anna  wrote:
> With the release of 10.1.3, I thought I'd revisit flashing an XO over the
> LAN.  Here are my notes, if anyone's interested.

Interesting!

For a full reflash, as James pointed out, NANDBlaster wins. But if you
have laptops out there with an earlier 10.1.x, the local XS can serve
incremental update images for olpc-update :-)

cheers,



m
-- 
 martin.langh...@gmail.com
 mar...@laptop.org -- School Server Architect
 - ask interesting questions
 - don't get distracted with shiny stuff  - working code first
 - http://wiki.laptop.org/go/User:Martinlanghoff
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-17 Thread James Cameron 
On Mon, Jan 17, 2011 at 03:06:52PM -0600, Anna wrote:
> I looked into this a little more and found, per http://httpd.apache.org/docs/
> trunk/mod/mod_reqtimeout.html that module is for Apache 2.2.15 and later.  The
> Apache version on XS 0.6 is a bit long in the tooth.
> 
> [root@schoolserver ~]# httpd -v
> Server version: Apache/2.2.9 (Unix)
> Server built:   Jul 14 2008 15:36:56
> 
> Anyone have ideas for a workaround?

I suspect there is a timeout in Apache core for that version, and that
2.2.15 moved the feature into a module.  See the TimeOut directive:

http://httpd.apache.org/docs/2.0/mod/core.html#timeout

The default of five minutes seems quite sufficient.

You might also prove if it is a cause, using tcpdump to capture the port
80 TCP stream, then analyse it to see if the connection was closed
prematurely by the server.  Only then try changing the timeout.

If you see OpenFirmware's side of the packet stream misbehaving, let me
know.

-- 
James Cameron
http://quozl.linux.org.au/
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-17 Thread Anna 
On Sun, Jan 16, 2011 at 9:43 PM, James Cameron  wrote:

> I don't know about the Apache version used on the XS, but on a desktop
> here the edit was in /etc/apache2/mods-available/reqtimeout.conf and
> changed
>
> RequestReadTimeout header=20-40,minrate=500
> RequestReadTimeout body=10,minrate=500
>
> to
>
> RequestReadTimeout header=20-40,minrate=50
> RequestReadTimeout body=20,minrate=50
>
>
I looked into this a little more and found, per
http://httpd.apache.org/docs/trunk/mod/mod_reqtimeout.html that module is
for Apache 2.2.15 and later.  The Apache version on XS 0.6 is a bit long in
the tooth.

[root@schoolserver ~]# httpd -v
Server version: Apache/2.2.9 (Unix)
Server built:   Jul 14 2008 15:36:56

Anyone have ideas for a workaround?

Anna Schoolfield
Birmingham
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-16 Thread Anna 
On Sun, Jan 16, 2011 at 9:43 PM, James Cameron  wrote:

> On Sun, Jan 16, 2011 at 09:22:19PM -0600, Anna wrote:
> > I'm not familiar enough with Apache to know what to edit as far as the
> > maximum request duration.  Any tips there?
>
> I think I found evidence in Apache logs of a timeout, so I changed this.
>
> I don't know about the Apache version used on the XS, but on a desktop
> here the edit was in /etc/apache2/mods-available/reqtimeout.conf and
> changed
>
> RequestReadTimeout header=20-40,minrate=500
> RequestReadTimeout body=10,minrate=500
>
> to
>
> RequestReadTimeout header=20-40,minrate=50
> RequestReadTimeout body=20,minrate=50
>
> (This has consequences for a server available to the general public,
> since denial of service attacks become slightly easier.  But on a local
> server your risk will be lower.)
>
> --
> James Cameron
> http://quozl.linux.org.au/
>


I can't grep anything on XS 0.6 in /etc/httpd resembling that, so this is
probably going to be a question for Martin.
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-16 Thread James Cameron 
On Sun, Jan 16, 2011 at 09:22:19PM -0600, Anna wrote:
> I'm not familiar enough with Apache to know what to edit as far as the
> maximum request duration.  Any tips there?

I think I found evidence in Apache logs of a timeout, so I changed this.

I don't know about the Apache version used on the XS, but on a desktop
here the edit was in /etc/apache2/mods-available/reqtimeout.conf and
changed

RequestReadTimeout header=20-40,minrate=500
RequestReadTimeout body=10,minrate=500

to

RequestReadTimeout header=20-40,minrate=50
RequestReadTimeout body=20,minrate=50

(This has consequences for a server available to the general public,
since denial of service attacks become slightly easier.  But on a local
server your risk will be lower.)

-- 
James Cameron
http://quozl.linux.org.au/
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-16 Thread Anna 
On Sun, Jan 16, 2011 at 8:49 PM, James Cameron  wrote:

>
> Yes, the XO-1.5 firmware attempts NANDblaster.  However, you might
> override this by attempting fs-update over HTTP:
>
>ok fs-update http:\\server\os860-4g.zd
>
> I've just tried this here, and the green boxes cease on about the second
> line.  I remember I had to increase the maximum request duration on
> Apache last time I tested it.
>  
>

I only got about 3/4 of one green line before it pooped out.

fs-update http:\\172.18.0.1\os860-4g.zd

After many, many minutes it complains about "Short read of zdata file"

And then "WARNING: The file specified 29489 chunks but wrote only 280
chunks"

I'm not familiar enough with Apache to know what to edit as far as the
maximum request duration.  Any tips there?

Anna Schoolfield
Birmingham
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel

Re: [Server-devel] Notes on Flashing the NAND over the LAN

2011-01-16 Thread James Cameron 
On Sun, Jan 16, 2011 at 08:21:02PM -0600, Anna wrote:
> Trying disk:\fs.zip
> Trying ext:\fs.zip
> Trying NANDblaster
> Boot device: /dropin-fs:nb15_rx Arguments:  ssid:OLPC-NANDblaster
> Scan for: OLPC-NANDblaster found
> Associate with: OLPC-NANDblaster
> Waiting for server

Yes, the XO-1.5 firmware attempts NANDblaster.  However, you might
override this by attempting fs-update over HTTP:

ok fs-update http:\\server\os860-4g.zd

I've just tried this here, and the green boxes cease on about the second
line.  I remember I had to increase the maximum request duration on
Apache last time I tested it.

-- 
James Cameron
http://quozl.linux.org.au/
___
Server-devel mailing list
Server-devel@lists.laptop.org
http://lists.laptop.org/listinfo/server-devel