[Bug 1898778] Re: RPCNFSDARGS missing from /etc/default/nfs-kernel-server

[Christian Ehrhardt ]

Hi Patrick,
thank you for your report!

#1 RPCNFSDPRIORITY
That was used with the old style of starting a service like
  start-stop-daemon ... --nicelevel $RPCNFSDPRIORITY
in sysV style nfs-kernel-server.init
Which doesn't work that way in systemd, one would need to set the following in the service file
  LimitNICE=$RPCNFSDPRIORITY


#2 RPCNFSDOPTS
I agree to your analysis of /usr/lib/systemd/scripts/nfs-utils_env.sh generating /run/sysconfig/nfs-utils on behalf of nfs-config.service.
And then nfs-server.service using this ans environment for $RPCNFSDARGS
Of echo RPCNFSDARGS=\"$RPCNFSDOPTS ${RPCNFSDCOUNT:-8}\" we have:
- RPCNFSDCOUNT which is in the .default
- RPCNFSDOPTS missing in .default
- the .default lists some exclusions, but this isn't part of that list

# the following are supported by the systemd units, but not exposed in default files
# echo SMNOTIFYARGS=\"$SMNOTIFYARGS\"
# echo RPCIDMAPDARGS=\"$RPCIDMAPDARGS\"
# echo RPCGSSDARGS=\"$RPCGSSDARGS\"
# echo BLKMAPDARGS=\"$BLKMAPDARGS\"
# echo GSS_USE_PROXY=\"$GSS_USE_PROXY\"

Note: the old sysV also didn't have RPCNFSDOPTS/RPCNFSDARGS it directly passed RPCNFSDCOUNT.
So this isn't a regression but a request to fix a feature (daemon arguments) that seems only partially implemented.

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https://bugs.launchpad.net/bugs/1898778

Title:
  RPCNFSDARGS missing from /etc/default/nfs-kernel-server

Status in nfs-utils package in Ubuntu:
  Triaged

Bug description:
  The tl;dr: version:

  An RPCNFSARGS variable needs to be added to /etc/default/nfs-kernel-
  server file in order to facilitate turning off NFSv3, so that the
  rpcbind dependency goes away. Otherwise the user is forced to snoop
  through all the related systemd service files (as I did) in order to
  figure out how to turn off NFSv3.   Meanwhile, this does appear in
  /etc/default/nfs-kernel-server, but doesn't seem to be used anywhere
  in the systemd service file chain for nfsd:

    # Runtime priority of server (see nice(1))
    RPCNFSDPRIORITY=0

  I'll just repost what I wrote to the NFS developers list about this:

  The service file for the nfs server, /usr/lib/systemd/system/nfs-
  config.service

  includes this:

    Wants=nfs-config.service
    After=nfs-config.service

  All nfs-config does is run this script:

    ExecStart=/usr/lib/systemd/scripts/nfs-utils_env.sh

  and the script reads the /etc/default/nfs* files and then

    echo RPCNFSDARGS=\"$RPCNFSDOPTS ${RPCNFSDCOUNT:-8}\"

  which then goes on the command line in the nfs-server service file:

    ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS

  So the solution is to add this line to /etc/default/nfs-kernel-server:

    RPCNFSDOPTS="-N 2 -N 3"

  Still unaccounted for is this variable in /etc/default/nfs-kernel-
  server:

    # Runtime priority of server (see nice(1))
    RPCNFSDPRIORITY=0

  Which I can't find used anywhere in the service files.  But in any
  case, adding the RPCNFSDOPTS variable resolved the issue:

  root at helios:~# cat /proc/fs/nfsd/versions
  -2 -3 +4 +4.1 +4.2

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