Re: [gentoo-user] How to enable NFS v2

[Jack]

This list prefers bottom posting.  See below.

On 2022.07.23 21:52, Fabulous Zhang Zheng wrote:
> Dear Jack,
>
> thanks for your reply, I reconfigured menuconfig.
>
> NFS v2 support I found is client support, and I can't still find v2
> support
> for server ( sorry for not mentioning it in my ambiguous question )
> I also looked up in forum and wiki, and recent posts seem to indicate
> the removal of nfs v2 server support.
>
> I followed this link for open genera
> ( https://archives.loomcom.com/genera/genera-install.html )
> not in portage or an overlay.
>
> Best regards :)
>
> Jack <ostroffjh@×××××××××××××××××.net> 于2022年7月24日周日 03:30写道：
>
> > On 2022.07.23 01:25, Fabulous Zhang Zheng wrote:
> > > Dear genteel users,
> > >
> > >
> > > Recently I'm trying to run Open Genera on Gentoo, which requires
> the
> > > old
> > > NFS v2 protocol for communication.
> > >
> > > I successfully run it on a Ubuntu 16.04 virtual machine, which
> > > enables it
> > > by default.
> > >
> > > In 5.18.12 it seems deprecated and not supported, am I supposed to
> > > revert
> > > back to a kernel version before its removal, or manually patch it
> > > into the
> > > current kernel ? Or there might be some more elegant methods ?
> > >
> > > It will be much appreciated if anyone could help :)
> > >
> > Looking at the config for 5.18.14, I see no evidence V2 has been
> > deprecated.  However, your kernel may well have been configured to
> not
> > use V2.  Note the kernel has different client and server settings
> for
> > this.  Most likely, you just need to reconfigure and recompile your
> > kernel.
> >
> > Also, I don't see any genera available in portage.  If it is in an
> > overlay, I would check for any documentation in the overlay about
> > necessary kernel configuration.
> >
> > Jack
> >
> >
>
I am aware that NFSv2 is likely to be deprecated due to security  
concerns, but it hasn't happened yet in the Linux kernel.

The entry (5.18.14) for "NFS server support (NFSD)" or CONFIG_NFSD: says

-----
Choose Y here if you want to allow other computers to access files  
residing on this system using Sun's Network File System protocol. To  
compile the NFS server support as a module, choose M here: the module  
will be called nfsd.

You may choose to use a user-space NFS server instead, in which case  
you can choose N here.

To export local file systems using NFS, you also need to install user  
space programs which can be found in the Linux nfs-utils package,  
available from http://linux-nfs.org/. More detail about the Linux NFS  
server implementation is available via the exports(5) man page.

Below you can choose which versions of the NFS protocol are available  
to clients mounting the NFS server on this system. Support for NFS  
version 2 (RFC 1094) is always available when CONFIG_NFSD is selected.
-----

In addition, from just a very brief search, it is likely that there are  
other configuration files you may need to alter in order for the nfs  
server to actually respond to V2 requests.  This is likely how some  
distributions have blocked V2 from the default configuration.  Google  
is your friend.

Jack