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RedHat 9 (Linux i386) - man page for mod-active (redhat section 8)

MOD-ACTIVE(8)			     System Manager's Manual			    MOD-ACTIVE(8)

       mod-active - batch processing of ctlinnd newgroup/rmgroup/changegroup

       mod-active [ ctlinnd_command_file ]

       mod-active  is  a  perl	script	that  updates the active file based on its input lines of
       ctlinnd newgroup, rmgroup and changegroup commands.  It pauses the  server  briefly  while
       the  existing  active  file is read and rewritten, which not only keeps innd from updating
       the active file but also locks against other instances of mod-active.

       The input to mod-active can come either from one or more files named on the command  line,
       or  from  the standard input.  Typically its input is the output from the docheckgroups or
       actsync commands.  Every line which  contains  the  string  "ctlinnd  newgroup",  "ctlinnd
       rmgroup"  or  "ctlinnd  changegroup", optionally preceded by whitespace and/or the path to
       ctlinnd, is noted for the update.  Redundant commands, such as a newgroup directive for	a
       group  that  already  exists, are silently ignored.  All other lines in the input are also
       silently ignored.

       After the new active file has been generated, the existing one is  renamed  to  active.old
       and the new one is moved into place.  The script then displays the differences between the
       two files.

       Any groups that were added to the active file are also added to the active.times file with
       the string "checkgroups-update".

       Though  innd is paused while mod-active works, it is not inconceivable that there could be
       a conflict if something else tries to update the active file during the	relatively  short
       time  that  mod-active is working.  The two most realistic ways I can think of for this to
       happen are either by an administrator concurrently doing a manual ctlinnd command,  or  by
       innd  receiving	a  control  message, then mod-active pausing the server, then the control
       message handler script that innd forked running its own ctlinnd command	while  mod-active
       is working.  I've been using mod-active regularly for several years, though, and never had
       either problem.

       Written by David C Lawrence <tale@isc.org>.

       active(5), actsync(8), ctlinnd(8), innd(8).


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