FAI with nfsroot on stretch failing with read-only error at /tmp/fai

[Nat Sincheler]

On 6/28/2017 5:24 PM, Bill MacAllister wrote:
> On Wednesday, June 28, 2017 3:21:58 PM PDT, Nat Sincheler wrote:
>> We are able to PXE boot and do an NFS mount, but we are getting a 
>> "Read-only file system" error when FAI is trying to make the directory 
>> /tmp/fai.
>>
>> We get to the point where we see this at the console:
>>
>> INIT: version 2.88 booting
>> cat: /sys/class/net/eth0/name_assign_type: Invalid argument
>> cat: /sys/class/net/eth0/name_assign_type: Invalid argument
>> [    35.498423] dracut: Switching root
>> mkdir: cannot create directory '/tmp/fai': Read-only file system
>> chown: cannot access 'tmp/fai': No such file or directory
>>
>>
>> A screen-shot of the console shows the error:
>> https://drive.google.com/file/d/0B6Uk8YXuZvLJb1Q0eGNPVDBva3c/view?usp=sharing 
>>
>>
>>
>> Any ideas?
> 
> Sounds like you have this problem describe by Thomas in a previous
> response.

We moved to using "rootovl" instead of "aufs" and that has moved us past 
the read-only problem.



> 
> Bill
> 
> 
> When using a 4.X kernel FAI uses overlayfs on top of the read-only
> nfsroot for making it writeable. This works only when using NFS v3.
> I'm pretty sure this must be fiexed in overlayfs.
> 
> If the install client mounts the nfsroot via NFSv4 (using NFS 4.2 with
> the recent 4.9 kernel) the nfsroot will remain read-only and FAI
> cannot proceed.
> 
> You can force NFS v3 on the server side by adding a line to
> /etc/exports as described in
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=676883#10
> 
> Or you can add a nfs option into the pxelinux.cfg file when specifying
> the mount address for the nfsroot:
> root=1.2.3.4:/srv/fai/nfsroot:vers=3
> 
> If you want to experiment with different NFS v4 versions (using
> minorversion) you can use something like this
> root=1.2.3.4:/srv/fai/nfsroot:vers=4,minorversion=0
> 
> BTW, there's a new package aufs-dkms which includes aufs for 4.X
> kernel. It did not test it yet. Maybe this is a solution for using
> nfsroot via NFS v4 using a 4.X kernel.
>>
>>
>>
>>
>