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

[Jack]

On 2022.07.29 12:54, Fabulous Zhang Zheng wrote:
> Dear Jack,
>
>
> Jack <ostroffjh@×××××××××××××××××.net> 于2022年7月27日周三 06:59写道：
>
> > 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
> >
> >
> Sorry for the late reply,
>
> I found this commit
> <https://git.linux-nfs.org/?p=steved/nfs-utils.git;a=commit;h=2c2c36c59fa1de2ff7fd28917e54700ecb39b730>
> of last November, which might be the reason.
> 2.5.4 might be the last version with such support.
>
> I emerged manually changed ebuild  and  $( rpcinfo -p localhost |
> grep nfs
> )
> explicitly indicates the version 2 of nfs, which runs successfully.
>
> Thanks again for your dedicated and detailed reply,
> and also the bottom-posting reminder.
>
>
> Best regards :)
>
I don't fully understand the interactions and relationship, but there  
are obviously some differences between the kernel nfs and userland  
nfs.  Glad you got it working for you.