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.\" ========================================================================
.\"
.IX Title "NFSDCLD 8"
.TH NFSDCLD 8 "2011-12-21" "" ""
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
nfsdcld \- NFSv4 Client Tracking Daemon
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
nfsdcld [\-d] [\-F] [\-p path] [\-s stable storage dir]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
nfsdcld is the NFSv4 client tracking daemon. It is not necessary to run
this daemon on machines that are not acting as NFSv4 servers.
.PP
When a network partition is combined with a server reboot, there are
edge conditions that can cause the server to grant lock reclaims when
other clients have taken conflicting locks in the interim. A more detailed
explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3.
.PP
In order to prevent these problems, the server must track a small amount
of per-client information on stable storage. This daemon provides the
userspace piece of that functionality.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-d\fR, \fB\-\-debug\fR" 4
.IX Item "-d, --debug"
Enable debug level logging.
.IP "\fB\-F\fR, \fB\-\-foreground\fR" 4
.IX Item "-F, --foreground"
Runs the daemon in the foreground and prints all output to stderr
.IP "\fB\-p\fR \fIpipe\fR, \fB\-\-pipe\fR=\fIpipe\fR" 4
.IX Item "-p pipe, --pipe=pipe"
Location of the \*(L"cld\*(R" upcall pipe. The default value is
\&\fI/var/lib/nfs/rpc_pipefs/nfsd/cld\fR. If the pipe does not exist when the
daemon starts then it will wait for it to be created.
.IP "\fB\-s\fR \fIstorage_dir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4
.IX Item "-s storagedir, --storagedir=storage_dir"
Directory where stable storage information should be kept. The default
value is \fI/var/lib/nfs/nfsdcld\fR.
.SH "NOTES"
.IX Header "NOTES"
The Linux kernel NFSv4 server has historically tracked this information
on stable storage by manipulating information on the filesystem
directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR
points.
.PP
This daemon requires a kernel that supports the nfsdcld upcall. If the
kernel does not support the new upcall, or is using the legacy client
name tracking code then it will not create the pipe that nfsdcld uses to
talk to the kernel.
.PP
This daemon should be run as root, as the pipe that it uses to communicate
with the kernel is only accessable by root. The daemon however does drop all
superuser capabilities after starting. Because of this, the \fIstoragedir\fR
should be owned by root, and be readable and writable by owner.
.SH "AUTHORS"
.IX Header "AUTHORS"
The nfsdcld daemon was developed by Jeff Layton <jlayton@redhat.com>.