Jim,
Have you considered making a new bin directory on the flash drive to
hold the big additional modules, moving the apache, mysql, php modules
there, then merely putting symbolic links in the directory where they
originally were. With that approach you wouldn't have to chroot at
all.
I've found that stripping binaries also greatly reduces their size.
Brian
m("opto-solutions.com","jimfred");"> wrote:
>...sorry for the soapbox
Soapbox stuff is good. Even if I don't benefit from it (being too
stupid,
too stubborn etc), other readers might. Any information is good unless
it's
lies.
I agree that Linux is Linux, be it big or small, and this is a big
advantage
in an embedded system. I'm selling that concept to customers.
I can mount filesystems anywhere, but I've run into problems mounting
/mnt/MyUsbFlash on / by doing a chroot which was the simplest way to
get an
nfsroot image to run locally from flash on this board. If I mount
/mnt/MyUsbFlash on /usr, the problems I foresee is that Apache, mysql
and
php (6 modules in total that were installed by apt-get) may expect to
see
various bin, lib and etc configuration files. Maybe I should
re-evaluate the
assumption that it would be difficult to move those 6 modules to /usr or
more appropriately /opt/lampp.
An easier approach might be to copy-over the /etc stuff related to
these 6
modules and mount /mnt/MyUsbFlash/bin on /bin and likewise for any
other bin
and lib directories.
Pointing Apache to something like /mnt/MyUsbFlash/www is easy. That's a
matter of changing a config file under /etc.
Any comments are welcome. If I had to articulate this as one question it
would go like this: Assuming I have a working filesystem on an nfsroot,
and
I want to move that filesystem to the TS board so that it can boot
stand-alone, and that filesystem is too big to fit in internal flash,
how
would you configure the system to boot and use that filesystem?
Maybe get a different TS board with more boot-flash?
-----Original Message-----
From: m("yahoogroups.com","ts-7000");"> [m("yahoogroups.com","ts-7000");">] On
Behalf Of
Jim Jackson
Sent: Thursday, April 06, 2006 8:22 AM
To: m("yahoogroups.com","ts-7000");">
Subject: RE: [ts-7000] TS-7250 filesystem access before and after chroot
On Thu, 6 Apr 2006 m("opto-solutions.com","jimfred");"> wrote:
> Let me run my assumptions by you:
> I have a working filesystem on an nfsroot that won't fit in
on-board
flash.
> By "won't fit", I mean that a straight copy of all necessary
directories
> won't fit and it may cost more time than it's worth to try to copy
only
the
> necessary files. If there's a fast way to determine the necessary
files
and
> the size of those files then I can review my assumption that it
won't fit.
> It seems easy and quick to use /usr/bin/loadUSB.sh to
'switch-over' to usb
> flash, but there appear to be side effects that are causing
problems now
and
> will probably cause unforeseen problems. An alternative is to
mount only
the
> bin directories and any other large directories over the internal
flash
bin
> directories. I'm assuming that it will be a can of worms, or
> stickingplaster, to change Apache2, mysql and php et. al. to run
in a
> directory structure different from the directory structure they
where
> 'apt-get-installed' into on the nfsroot.
>
> Thanks for your observations and input.
Ok remember you can mount filesystems anywhere. In traditional unix
systems many have '/' as a smallish partition, with another partition
mounted as /usr, and another small one as /boot, and a large one as
/home
and maybe another as /var
Also remember you can partition a usbstick - it doesn't have to be
one filesystem. One can use fdisk to split it up into 2 or 3 partitions
of
suitable sizes. Each of the partitions can be mounted independantly
in different places.
You may be able to mount a usb stick partition under /usr to hold a lot
of
executables and libraries - you just need to make sure that everything
needed to get to the point where the usb is usable are in /bin and /lib
etc.
Maybe you have a lot of web stuff under /www so you could mount another
usb stick partition there.
By doing this you integrate the on board flash and usb flash into what
appears to be one seemless structure.
HTH
Jim
p.s. I keep banging on about it being useful if you run Linux on your
desktop/servers, because Linux is Linux whether it's on the TS7200
or on a quad xeon dell server. What I've outlined above is pretty
standard
stuff for Unix system sysadmins, and it all applies to here too.
(sorry for the soapbox stuff)
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