Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
[solved] Unable to start NFS service
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Networking & Security
View previous topic :: View next topic  
Author Message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 9:44 am    Post subject: [solved] Unable to start NFS service Reply with quote

I'm making my first foray into the joys of Gentoo with a Raspberry Pi 2, and I've already learned loads of dark secrets about Linux that had remained hidden after a decade of using Ubuntu. I'm loving the fine-grained control that Gentoo gives me over my dainty little machine.

Unfortunately, I'm stumbling with NFS4. I've emerged nfs-utils, but the NFS service won't start.
Code:
# service nfs start
 * Caching service dependencies ...                                       [ ok ]
 * Starting NFS mountd ...                                                [ ok ]
 * Starting NFS daemon ...
rpc.nfsd: Unable to access /proc/fs/nfsd errno 2 (No such file or directory).
Please try, as root, 'mount -t nfsd nfsd /proc/fs/nfsd' and then restart rpc.nfsd to correct the problem                                                  [ !! ]
 * Starting NFS smnotify ...                                              [ ok ]
 * ERROR: nfs failed to start

The suggested solution doesn't help:
Code:
# mount -t nfsd nfsd /proc/fs/nfsd
mount: unknown filesystem type 'nfsd'
I don't have a file called /etc/init.d/rpc.nfsd, so I'm not sure how to restart rpc.nfsd, but I'm fairly confident it wouldn't work given that the system seems blissfully unaware that NFS exists as a filesystem type. Should I have an rpc.nfsd service? It's not something I have on my Ubuntu boxes.

Googling the error suggests that there might be a problem with kernel support for NFS. I'm using a pre-compiled kernel so I don't know for sure what options were used when it was compiled. However, /proc/config - which I understand should tell me the compilation options used - gives a reassuring output:
Code:
# zcat /proc/config.gz | grep NFS
CONFIG_KERNFS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V3=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
CONFIG_NFS_SWAP=y
# CONFIG_NFS_V4_1 is not set
CONFIG_ROOT_NFS=y
CONFIG_NFS_FSCACHE=y
# CONFIG_NFS_USE_LEGACY_DNS is not set
CONFIG_NFS_USE_KERNEL_DNS=y
CONFIG_NFSD=m
CONFIG_NFSD_V2_ACL=y
CONFIG_NFSD_V3=y
CONFIG_NFSD_V3_ACL=y
CONFIG_NFSD_V4=y
# CONFIG_NFSD_FAULT_INJECTION is not set
CONFIG_NFS_ACL_SUPPORT=y
CONFIG_NFS_COMMON=y

Where do I go next?


Last edited by aahjnnot on Mon Feb 16, 2015 7:42 pm; edited 1 time in total
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 11:16 am    Post subject: Reply with quote

To provide nfsd you need CONFIG_NFSD set in kernel
Code:
CONFIG_NFSD=m


Tell you it is there, but set as module
It mean, as soon as you modprobe nfsd, module is loaded ; once load nfsd is there and the mount command should succeed.

the rpc.nfsd is the named of the deamon, the deamon is start by your service provider (that's unfamiliar to me, so i would say systemd). It mean redo your service nfs start after you have load the module
Back to top
View user's profile Send private message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 11:53 am    Post subject: Reply with quote

krinn wrote:
It mean, as soon as you modprobe nfsd, module is loaded ; once load nfsd is there and the mount command should succeed.

the rpc.nfsd is the named of the deamon, the deamon is start by your service provider (that's unfamiliar to me, so i would say systemd). It mean redo your service nfs start after you have load the module

Thanks, krinn. I hadn't realised what the 'm' stood for.

It seems that I have a problem persuading the kernel to load the required module:
Code:
modprobe -v nfsd
lsmod

Neither command gives me any output. I apparently have no kernel modules loaded (highly unusual I would have thought, but maybe the custom kernel for the Raspberry Pi doesn't make use of much modules as it is a tightly defined hardware platform?), but no error message is given when I try to force the loading of the nfsd module and dmesg shows no results at all.

Attempting to start the NFS service still gives me the same error.
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 12:06 pm    Post subject: Reply with quote

I don't know systemd at all, but it is possible this eating spider has also eat modprobe and use its own modules handling.
You can see your modules for your current kernel version there: cd /lib/modules/`uname -r`
If the module is there, and modprobe doesn't gave you any answer, it might be because modprobe isn't modprobe :)

Next if it is that, you have to read doc to get howto handle your modules with it, or wait for someone knowing systemd coming to help you.
(you could also try insmod instead of modprobe, but insmod doesn't handle module dependencies, but if nfsd has none, you'll be fine)


Last edited by krinn on Mon Feb 16, 2015 12:08 pm; edited 1 time in total
Back to top
View user's profile Send private message
Irre
Guru
Guru


Joined: 09 Nov 2013
Posts: 336
Location: Stockholm

PostPosted: Mon Feb 16, 2015 12:07 pm    Post subject: Reply with quote

I have these services started:
Code:
localhost ~ # rc-config show
Status of init scripts in runlevel "default"
  dbus                      [started]
  gpm                       [started]
  local                     [started]
  netmount                  [started]
  nfs                       [started]
  nfsclient                 [started]
  nfsmount                  [started]
  ntp-client                [started]
  samba                     [started]
  sshd                      [started]
  vixie-cron                [started]

And config:
Code:
localhost ~ # cat /etc/exports
# /etc/exports: NFS file systems being exported.  See exports(5).
/export                 *(rw,fsid=0,no_subtree_check)
/export/distfiles       *(rw,nohide,insecure,no_subtree_check,no_root_squash)
/export/portage         *(rw,nohide,insecure,no_subtree_check,no_root_squash)
/export/linux-src       *(rw,nohide,insecure,no_subtree_check,no_root_squash)
/export/sda-backup      *(rw,nohide,insecure,no_subtree_check,no_root_squash)
/export/sdb-backup      *(rw,nohide,insecure,no_subtree_check,no_root_squash)

localhost ~ # zcat /proc/config.gz | grep NFS
CONFIG_KERNFS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V3=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
# CONFIG_NFS_SWAP is not set
CONFIG_NFS_V4_1=y
# CONFIG_NFS_V4_2 is not set
CONFIG_PNFS_FILE_LAYOUT=y
CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN="kernel.org"
# CONFIG_NFS_V4_1_MIGRATION is not set
CONFIG_ROOT_NFS=y
CONFIG_NFS_FSCACHE=y
# CONFIG_NFS_USE_LEGACY_DNS is not set
CONFIG_NFS_USE_KERNEL_DNS=y
CONFIG_NFSD=m
CONFIG_NFSD_V2_ACL=y
CONFIG_NFSD_V3=y
CONFIG_NFSD_V3_ACL=y
CONFIG_NFSD_V4=y
# CONFIG_NFSD_FAULT_INJECTION is not set
CONFIG_NFS_ACL_SUPPORT=y
CONFIG_NFS_COMMON=y
Back to top
View user's profile Send private message
John R. Graham
Administrator
Administrator


Joined: 08 Mar 2005
Posts: 10156
Location: Somewhere over Atlanta, Georgia

PostPosted: Mon Feb 16, 2015 12:13 pm    Post subject: Reply with quote

krinn wrote:
I don't know systemd at all, ...
Just FYI:
Code:
hal ~ # equery belongs `which service`
 * Searching for /sbin/service ...
sys-apps/openrc-0.13.9 (/sbin/service -> /sbin/openrc)
sys-apps/openrc-0.13.9 (/sbin/openrc)
It's just a wrapper. "service x start" is equivalent to "/etc/init.d/x start".

- John
_________________
I can confirm that I have received between 0 and 499 National Security Letters.


Last edited by John R. Graham on Mon Feb 16, 2015 12:15 pm; edited 1 time in total
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 12:14 pm    Post subject: Reply with quote

Should migrate to newer openrc one day then :)
Did they bork modprobe or something?
edit: lol never use it, but indeed even older openrc version have that service tools :D


Last edited by krinn on Mon Feb 16, 2015 12:21 pm; edited 2 times in total
Back to top
View user's profile Send private message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 12:15 pm    Post subject: Reply with quote

krinn wrote:
I don't know systemd at all, but it is possible this eating spider has also eat modprobe and use its own modules handling.
You can see your modules for your current kernel version there: cd /lib/modules/`uname -r`
If the module is there, and modprobe doesn't gave you any answer, it might be because modprobe isn't modprobe :)

Next if it is that, you have to read doc to get howto handle your modules with it, or wait for someone knowing systemd coming to help you.
(you could also try insmod instead of modprobe, but insmod doesn't handle module dependencies, but if nfsd has none, you'll be fine)

I obviously have some problem with loading modules.
Code:
cd /lib/modules/`uname -r`
-bash: cd: /lib/modules/3.18.6-v7+: No such file or directory
ls

Even the parent folder /lib/modules is missing, and the command 'insmod nfsd' gives an error saying that there is no such file or directory.

Where does /lib/modules come from? Do I need to manually symlink it somewhere?
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 12:18 pm    Post subject: Reply with quote

when you build the kernel the modules are store in /lib/modules/kernel-version
so if you have a kernel without its modules, you have an incomplete kernel.
as nfsd is build as module, you cannot use it without the module of course, so no nfs until you have the module or a kernel with nfsd build-in.
Back to top
View user's profile Send private message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 12:24 pm    Post subject: Reply with quote

krinn wrote:
when you build the kernel the modules are store in /lib/modules/kernel-version
so if you have a kernel without its modules, you have an incomplete kernel.
as nfsd is build as module, you cannot use it without the module of course, so no nfs until you have the module or a kernel with nfsd build-in.

Odd! I wonder what else might be missing...

But perhaps this presents me with an opportunity to learn the joys of kernel compilation. It will take a while on a Pi, though!
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 12:43 pm    Post subject: Reply with quote

aahjnnot wrote:
It will take a while on a Pi, though!

It is something another computer can do for the Pi.
Back to top
View user's profile Send private message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 1:01 pm    Post subject: Reply with quote

krinn wrote:
aahjnnot wrote:
It will take a while on a Pi, though!

It is something another computer can do for the Pi.

You forget that I'm a beginner with Gentoo!

The trouble is that all of the guides that I've seen assume the availability of another box with Gentoo, but all of my other hardware runs Ubuntu. I'm sure it's possible to set things up to cross-compile across distros or at least to have a Gentoo VM on a powerful PC, but, for now, I think that patiently watching some scrolling text might be the safest solution. I'm feeling quite proud of what I've achieved so far - particularly my network authentication with SSSD, Kerberos and LDAP - so I don't want to tempt fate at this point.

I will learn to do it one day, though :)
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 3:58 pm    Post subject: Reply with quote

I never said you need a Gentoo to build a kernel for a gentoo. You can even do it with Windows.
But it's just easier with a linux, and it's just easier with a gentoo (that is like ubuntu but per its usage must have the tools to build something, gcc, headers...), while ubuntu (i'm not sure it is or not) may need additional package to have the compiler.
But if your ubuntu is ready for compiling stuff, you're good to go.
So everything is easier with a gentoo because you must have a gcc to run a gentoo, and so gcc is always there. But any ubuntu can use gcc too ;)

And you don't need cross-compile or anything, nor need to install a gentoo. Per example, you could just run a livecd (a gentoo one, 32bits version) from another computer to build the kernel.
No cross-compilation, no gentoo install, but still you are able to build the kernel for your pi with the power of that computer.

It is no different than your ubuntu computers, as i suppose you don't use a kernel you have built with them, but the one gave by ubuntu ; and this kernel was build by the ubuntu compile farm, not by any of your computers.
Back to top
View user's profile Send private message
krinn
Watchman
Watchman


Joined: 02 May 2003
Posts: 6964

PostPosted: Mon Feb 16, 2015 4:24 pm    Post subject: Reply with quote

krinn wrote:
No cross-compilation, no gentoo install, but still you are able to build the kernel for your pi with the power of that computer.

sorry was thinking about 32b vs 64b issue, of course i realize later pi use arm cpu, and cross-compile is need then if other computers aren't arm.
Back to top
View user's profile Send private message
aahjnnot
n00b
n00b


Joined: 16 Feb 2015
Posts: 14

PostPosted: Mon Feb 16, 2015 7:42 pm    Post subject: Reply with quote

So my kernel compiled in a little under two hours. NFS now starts.

Thanks for the help, guys.
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Networking & Security All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum