'\" te
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.TH NFSLOGD 1M "Dec 2, 2004"
.SH NAME
nfslogd \- nfs logging daemon
.SH SYNOPSIS
.LP
.nf
\fB/usr/lib/nfs/nfslogd\fR
.fi

.SH DESCRIPTION
.sp
.LP
The \fBnfslogd\fR daemon provides operational logging to the Solaris \fBNFS\fR
server. It is the \fBnfslogd\fR daemon's job to generate the activity log by
analyzing the \fBRPC\fR operations processed by the \fBNFS\fR server. The log
will only be generated for file systems exported with  logging enabled. This is
specified at file system export time by means of the \fBshare_nfs\fR(1M)
command.
.sp
.LP
NFS server logging is not supported on Solaris machines that are using NFS
Version 4.
.sp
.LP
Each record in the log file includes a time stamp, the \fBIP\fR address (or
hostname if it can be resolved) of the client system, the file or directory
name the operation was performed on, and the type of operation. In the basic
format, the operation can either be an input (i) or output (o) operation. The
basic format of the \fBNFS\fR server log is compatible with the log format
generated by the Washington University \fBFTPd\fR daemon. The log format can be
extended to include directory modification operations, such as \fBmkdir\fR,
\fBrmdir\fR, and \fBremove\fR. The extended format is not compatible with the
Washington University \fBFTPd\fR daemon format. See \fBnfslog.conf\fR(4) for
details.
.sp
.LP
The \fBNFS\fR server logging mechanism is divided in two phases. The first
phase is performed by the \fBNFS\fR kernel module, which records raw \fBRPC\fR
requests and their results in work buffers backed by permanent storage. The
location of the work buffers is specified in the /\fBetc/nfs/nfslog.conf\fR
file. Refer to \fBnfslog.conf\fR(4) for more information. The second phase
involves the \fBnfslogd\fR user-level daemon, which periodically reads the work
buffers, interprets the raw \fBRPC\fR information, groups related \fBRPC\fR
operations into single transaction records, and generates the output log. The
\fBnfslogd\fR daemon then sleeps waiting for more information to be logged to
the work buffers. The amount of time that the daemon sleeps can be configured
by modifying the \fBIDLE_TIME\fR parameter in \fB/etc/default/nfslogd\fR. The
work buffers are intended for internal consumption of the \fBnfslogd\fR daemon.
.sp
.LP
\fBNFS\fR operations use file handles as arguments instead of path names. For
this reason the \fBnfslogd\fR daemon needs to maintain a database of file
handle to path mappings in order to log the path name associated with an
operation instead of the corresponding file handle. A file handle entry is
added to the database when a client performs a lookup or other \fBNFS\fR
operation that returns a file handle to the client.
.sp
.LP
Once an \fBNFS\fR client obtains a file handle from a server, it can hold on to
it for an indefinite time, and later use it as an argument for an \fBNFS\fR
operation on the file or directory. The \fBNFS\fR client can use the file
handle even after the server reboots. Because the database needs to survive
server reboots, it is backed by permanent storage. The location of the database
is specified by the \fIfhtable\fR parameter in the \fB/etc/nfs/nfslog.conf\fR
file. This database is intended for the internal use of the \fBnfslogd\fR
daemon.
.sp
.LP
In order to keep the size of the file handle mapping database manageable,
\fBnfslogd\fR prunes the database periodically. It removes file handle entries
that have not been accessed in more than a specified  amount of time. The
\fBPRUNE_TIMEOUT\fR configurable  parameter in \fB/etc/default/nfslogd\fR
specifies the  interval length between successive runs of the pruning process.
A  file handle record will be removed if it has not been used since the last
time the pruning process  was executed. Pruning of the database can effectively
be disabled by setting the \fBPRUNE_TIMEOUT\fR as  high as \fBINT_MAX\fR.
.sp
.LP
When pruning is enabled, there is always a risk that a client may have held on
to a file handle longer than the \fBPRUNE_TIMEOUT\fR and perform an \fBNFS\fR
operation on the file handle after the matching record in the mapping database
had been removed. In such case, the pathname for the file handle will not be
resolved, and the log will include the file handle instead of the pathname.
.sp
.LP
There are various configurable parameters that affect the behavior of the
\fBnfslogd\fR daemon. These parameters are found in \fB/etc/default/nfslogd\fR
and are described below:
.sp
.ne 2
.na
\fB\fBUMASK\fR\fR
.ad
.RS 27n
Sets the file mode for the log files, work buffer files and file handle mapping
database.
.RE

.sp
.ne 2
.na
\fB\fBMIN_PROCESSING_SIZE\fR\fR
.ad
.RS 27n
Specifies the minimum size, in bytes, that the buffer  file must reach before
processing the work information and  writing to the log file. The value of
\fBMIN_PROCESSING_SIZE\fR must be between 1 and \fBulimit\fR.
.RE

.sp
.ne 2
.na
\fB\fBIDLE_TIME\fR\fR
.ad
.RS 27n
Specifies the amount of time, in seconds, the daemon should sleep while waiting
for more information to be placed in the buffer file. \fBIDLE_TIME\fR also
determines how often the configuration file will be reread. The value of
\fBIDLE_TIME\fR must be between 1 and \fBINT_MAX\fR.
.RE

.sp
.ne 2
.na
\fB\fBMAX_LOGS_PRESERVE\fR\fR
.ad
.RS 27n
The \fBnfslogd\fR periodically cycles its logs. \fBMAX_LOGS_PRESERVE\fR
specifies the maximum number of log files to save. When \fBMAX_LOGS_PRESERVE\fR
is reached, the oldest files will be overwritten as new log files are created.
These files will be saved with a numbered extension, beginning with
\fBfilename.0\fR. The oldest file will have the highest numbered extension up
to the value configured for \fBMAX_LOGS_PRESERVE\fR. The value of
\fBMAX_LOGS_PRESERVE\fR must be between 1 and \fBINT_MAX\fR.
.RE

.sp
.ne 2
.na
\fB\fBCYCLE_FREQUENCY\fR\fR
.ad
.RS 27n
Specifies how often, in hours, the log files are cycled. \fBCYCLE_FREQUENCY\fR
is used to insure that the log files  do not get too large. The  value of
\fBCYCLE_FREQUENCY\fR must be between 1  and \fBINT_MAX\fR.
.RE

.sp
.ne 2
.na
\fB\fBMAPPING_UPDATE_INTERVAL\fR\fR
.ad
.RS 27n
Specifies the time interval, in seconds, between updates of the records in the
file handle to path mapping tables. Instead of updating the \fBatime\fR of a
record each time that record is accessed, it is only updated if it has aged
based on this parameter. The record  access time is used by the pruning routine
to determine whether the record should be removed from the database. The value
of this parameter must be between 1 and \fBINT_MAX\fR.
.RE

.sp
.ne 2
.na
\fB\fBPRUNE_TIMEOUT\fR\fR
.ad
.RS 27n
Specifies when a database record times out, in hours. If the time that elapsed
since the record was last accessed is greater than \fBPRUNE_TIMEOUT\fR then the
record can be pruned from the database. The default value for
\fBPRUNE_TIMEOUT\fR is  168 hours (7 days). The value of \fBPRUNE_TIMEOUT\fR
must  be between 1 and \fBINT_MAX\fR.
.RE

.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 5n
Daemon started successfully.
.RE

.sp
.ne 2
.na
\fB\fB1\fR\fR
.ad
.RS 5n
Daemon failed to start.
.RE

.SH FILES
.sp
.ne 2
.na
\fB\fB/etc/nfs/nfslogtab\fR \fR
.ad
.RS 24n

.RE

.sp
.ne 2
.na
\fB\fB/etc/nfs/nfslog.conf\fR\fR
.ad
.RS 24n

.RE

.sp
.ne 2
.na
\fB\fB/etc/default/nfslogd\fR\fR
.ad
.RS 24n

.RE

.SH SEE ALSO
.sp
.LP
\fBshare_nfs\fR(1M), \fBnfslog.conf\fR(4), \fBattributes\fR(5)