Date: Sun, 25 Feb 2001 12:21:18 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Martin Blapp <mb@imp.ch> Cc: alfred@freebsd.org, current@freebsd.org Subject: Re: some proposals about nfsd(8) Message-ID: <200102252021.f1PKLIi16065@earth.backplane.com> References: <Pine.BSF.4.21.0102252035030.7589-100000@levais.imp.ch>
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:
:
:Hi,
:
:nfsd.c has the following lines:
:
:(void)signal(SIGQUIT, SIG_IGN);
:(void)signal(SIGTERM, SIG_IGN);
:
:So nfsd(8) can only be killed by -9. Does this make
:sense ? Unregistering withing rpcbind or portmap is
:not possible, so one has to kill portmap(8) or rpcbind(8)
:and restart all the rpc services which had registered
:themself within portmapper. Very very bad.
nfsd sits in the kernel most of the time. It needs
to ignore SIGTERM in order to stay alive as long
as possible during a shutdown, otherwise loopback
mounts will not be able to unmount.
You do not have to kill portmap to restart nfsd.
Nfsd sits on a known port, all you need to do is
restart nfsd if you've killed it.
:This also rises some questions about 'nfsd -r'. This
:flag is used to reregister an existing nfsd within
nfsd -r is used if you already have nfsd's
running but somehow unregistered the nfs service
from the portmapper. For example, if you killed
the portmapper and restarted it. nfsd -r simply
reregisters the service that is already running
and then exits.
:portmapper or rpcbind. But since we use 'nfsd -h'
:to allow nfsd to bind to one or more IP's, it's
:broken for some part cause the wrong addresses get
:registered. It's better to kill nfsd and restart
:it.
The -h issue has nothing to do with the
portmapper. The portmapper does not map IP
addresses, only ports. -h is necessary when you have a
multi-homed machine and wish to allow UDP NFS mounts.
In order to UDP NFS mounts to work, the socket must
be bound to a particular IP address or the NFS
replies from the server may come from the wrong
host.
:So my first proposal is to remove the SIG_IGN lines and
:adding a signal handler for unregistering nfs within
:portmapper or rpcbind.
That will not solve any real problem and can screw
up a shutdown sequence.
:Second, I'd like to have this 'nfsd -r' removed, cause
:it's broken in the concept anyway and useless. Kill nfsd and
:restart does the same, and the binding is done the right way.
:
:Martin
There's nothing wrong with nfsd -r. It's there in
case someone decides they need to kill and restart
the portmapper but don't want to unnecessarily interrupt
existing nfsd connections (e.g. TCP NFS mounts).
-Matt
:Martin Blapp, mb@imp.ch
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