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nfslogd

Name
     nfslogd - nfs logging daemon

Synopsis
     /usr/lib/nfs/nfslogd

Description
     The nfslogd  daemon  provides  operational  logging  to  the
     Solaris  NFS  server. It is the nfslogd daemon's job to gen-
     erate the activity log by analyzing the RPC operations  pro-
     cessed by the NFS server. The log will only be generated for
     file systems exported with  logging enabled. This is  speci-
     fied   at   file   system   export  time  by  means  of  the
     share_nfs(1M) command.


     NFS server logging is not supported on Solaris machines that
     are using NFS Version 4.


     Each record in the log file includes a time  stamp,  the  IP
     address  (or  hostname  if it can be resolved) of the client
     system, the file or directory name the  operation  was  per-
     formed  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 NFS server log is compa-
     tible with  the  log  format  generated  by  the  Washington
     University  FTPd  daemon.  The log format can be extended to
     include directory modification operations,  such  as  mkdir,
     rmdir,  and  remove.  The  extended format is not compatible
     with the  Washington  University  FTPd  daemon  format.  See
     nfslog.conf(4) for details.


     The NFS server logging mechanism is divided in  two  phases.
     The first phase is performed by the NFS kernel module, which
     records raw RPC requests and their results in  work  buffers
     backed  by  permanent  storage.  The  location  of  the work
     buffers is specified in the /etc/nfs/nfslog.conf file. Refer
     to  nfslog.conf(4)  for  more  information. The second phase
     involves the nfslogd user-level daemon,  which  periodically
     reads  the work buffers, interprets the raw RPC information,
     groups  related  RPC  operations  into  single   transaction
     records,  and  generates  the output log. The nfslogd 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  IDLE_TIME  parameter  in
     /etc/default/nfslogd.  The  work  buffers  are  intended for
     internal consumption of the nfslogd daemon.

     NFS operations use file handles as arguments instead of path
     names.  For this reason the nfslogd 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 NFS
     operation that returns a file handle to the client.


     Once an NFS 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 NFS operation on the  file  or  direc-
     tory.  The NFS 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 fhtable  parameter  in  the
     /etc/nfs/nfslog.conf file. This database is intended for the
     internal use of the nfslogd daemon.


     In order to keep the size of the file handle  mapping  data-
     base  manageable,  nfslogd prunes the database periodically.
     It removes file handle entries that have not  been  accessed
     in  more than a specified  amount of time. The PRUNE_TIMEOUT
     configurable  parameter  in  /etc/default/nfslogd  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 exe-
     cuted. Pruning of the database can effectively  be  disabled
     by setting the PRUNE_TIMEOUT as  high as INT_MAX.


     When pruning is enabled, there  is  always  a  risk  that  a
     client  may  have  held  on to a file handle longer than the
     PRUNE_TIMEOUT and perform an NFS operation on the file  han-
     dle  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 han-
     dle instead of the pathname.


     There are various configurable parameters  that  affect  the
     behavior  of  the nfslogd daemon. These parameters are found
     in /etc/default/nfslogd and are described below:

     UMASK
                                Sets the file mode  for  the  log
                                files, work buffer files and file
                                handle mapping database.


     MIN_PROCESSING_SIZE
                                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
                                MIN_PROCESSING_SIZE    must    be
                                between 1 and ulimit.


     IDLE_TIME
                                Specifies the amount of time,  in
                                seconds,  the daemon should sleep
                                while waiting for  more  informa-
                                tion  to  be placed in the buffer
                                file. IDLE_TIME  also  determines
                                how  often the configuration file
                                will  be  reread.  The  value  of
                                IDLE_TIME  must  be between 1 and
                                INT_MAX.


     MAX_LOGS_PRESERVE
                                The nfslogd  periodically  cycles
                                its    logs.    MAX_LOGS_PRESERVE
                                specifies the maximum  number  of
                                log    files    to   save.   When
                                MAX_LOGS_PRESERVE 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  filename.0. The oldest file
                                will have  the  highest  numbered
                                extension up to the value config-
                                ured for  MAX_LOGS_PRESERVE.  The
                                value  of  MAX_LOGS_PRESERVE must
                                be between 1 and INT_MAX.


     CYCLE_FREQUENCY
                                Specifies how  often,  in  hours,
                                the   log   files   are   cycled.
                                CYCLE_FREQUENCY is used to insure
                                that  the  log  files  do not get
                                too   large.   The    value    of
                                CYCLE_FREQUENCY must be between 1
                                and INT_MAX.


     MAPPING_UPDATE_INTERVAL
                                Specifies the time  interval,  in
                                seconds,  between  updates of the
                                records in  the  file  handle  to
                                path  mapping  tables. Instead of
                                updating the atime  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 rou-
                                tine  to  determine  whether  the
                                record should be removed from the
                                database.  The  value   of   this
                                parameter  must  be between 1 and
                                INT_MAX.


     PRUNE_TIMEOUT
                                Specifies when a database  record
                                times  out, in hours. If the time
                                that elapsed since the record was
                                last  accessed  is  greater  than
                                PRUNE_TIMEOUT then the record can
                                be  pruned from the database. The
                                default value  for  PRUNE_TIMEOUT
                                is  168 hours (7 days). The value
                                of PRUNE_TIMEOUT must  be between
                                1 and INT_MAX.

Exit Status
     The following exit values are returned:

     0
          Daemon started successfully.


     1
          Daemon failed to start.

Files
     /etc/nfs/nfslogtab



     /etc/nfs/nfslog.conf



     /etc/default/nfslogd

Attributes
     See attributes(5) for descriptions of the  following  attri-
     butes:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE   TYPEATTRIBUTE   VALUE   _   Availabilityservice/file-
     system/nfs

See Also
     share_nfs(1M), nfslog.conf(4), attributes(5)
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