Re: [Hampshire] Using NFS root with raspberry pi. (Solution)

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Author: Tom Gamble via Hampshire
To: Hampshire LUG Discussion List
CC: Tom Gamble
Old-Topics: Re: [Hampshire] Using NFS root with raspberry pi.
Subject: Re: [Hampshire] Using NFS root with raspberry pi. (Solution)

Since the articles I found describing how to get nfsroot working were rather old and I am using Bullseye as the NFS server I wondered if that was the issue. so tried with an server running Centos 6 and bingo it worked no problems.

A quick cat /proc/fs/nfsd/versions
showed that on Centos 6 it supported NFSv2, NFSv3 and NFSv4

$ sudo cat /proc/fs/nfsd/versions
+2 +3 +4

Bullseye on the other hand doesn’t offer NFSv2 by default

$ sudo cat /proc/fs/nfsd/versions
-2 +3 +4 +4.1 +4.2

the solution is

cat /etc/default/nfs-kernel-server
# Number of servers to start up
# enable NFSv2 required for Raspberry Pi that want to use an NFSroot

# Runtime priority of server (see nice(1))

# Options for rpc.mountd.
# If you have a port-based firewall, you might want to set up
# a fixed port here using the --port option. For more information,
# see rpc.mountd(8) or
# To disable NFSv4 on the server, specify '--no-nfs-version 4' here

# Do you want to start the svcgssd daemon? It is only required for Kerberos
# exports. Valid alternatives are "yes" and "no"; the default is "no".

# Options for rpc.svcgssd.

So then

$ sudo cat /proc/fs/nfsd/versions
+2 +3 +4 +4.1 +4.2

and all is well with the world.


> On 11 Oct 2023, at 09:22, Adam John Trickett via Hampshire <hampshire@???> wrote:
> Tom,
> Can't say I've done it recently, but on my Red Hat course we did do remote
> booting. I can't remember of the top of my head what we did, but I'm sure NFS
> was involved.
> However I think it's an interesting idea and I'll have to look it up and see
> what I can find as well!
>> Thank you for your response I do like the idea of booting over the network
>> using PXE however I don’t currently have tufts server set up so was using
>> NFS a what I thought would be a quick solution.
>> Tell me if you set up the PI to PXE boot can you revery back to the Standard
>> SD boot t it won’t PXE boot?
>> Tom.
>>> On 10 Oct 2023, at 21:14, James Dutton <james.dutton@???> wrote:
>>> On Tue, 10 Oct 2023 at 13:04, Tom Gamble via Hampshire
>>> <hampshire@???> wrote:
>>>> Hi,
>>>> On my Raspberry Pis I’ve had a few issues with SD Cards failing so
>>>> thought there would be some mileage in using an NFS root. So if an SD
>>>> card fails I can just pop a new card in and my root fs will still be
>>>> good.>
>>> Hi,
>>> I have not tried your approach before. I have only done something
>>> called netboot.
>>> This is where you boot without an SD card at all.
>>> There are some hints on how to do it here:
>>> Now, I have not actually done it with a Raspberry PI, only with Linux
>>> servers and embedded systems, but the principles are the same.
>>> You set up a DHCP server, with parameters that tell it where to find
>>> the linux kernel and initrd files etc. it then tftp gets them or http
>>> gets them.
>>> An interesting aspect of this, is that booting over a 1Gbps network is
>>> actually quicker than booting from an SD card.
>>> Also if the device crashes, as the files are not stored on the crashed
>>> device, the files do not become corrupted at all, so it's really
>>> helpful when doing kernel development on an embedded system. It not
>>> only reboots quicker, but no files are corrupted, and you get to see
>>> the last logs before it crashed.
> --
> Adam Trickett
> Saint-Malo, Bretagne, France
> Wind is a finite resouce and harnessing it would slow the wind
> down which would cause temperatures to go up.
>    -- Joe Barton
>       US House Energy & Commerce Subcommittee member

> --
> Please post to: Hampshire@???
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