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slapo-syncprov(5)


NAME

   slapo-syncprov - Sync Provider overlay to slapd

SYNOPSIS

   /etc/ldap/slapd.conf

DESCRIPTION

   The  Sync Provider overlay implements the provider-side support for the
   LDAP Content Synchronization (RFC4533) as well as syncrepl  replication
   support.   The  overlay  can  be  used  with any backend that maintains
   entryCSN and entryUUID attributes for its entries. It  also  creates  a
   contextCSN attribute in the root entry of the database.

   The  contextCSN  is updated for every write operation performed against
   the database. To reduce database contention,  the  contextCSN  is  only
   updated  in  memory.  The  value  is  written to the database on server
   shutdown and read into memory on  startup,  and  maintained  in  memory
   thereafter.  Checkpoints may be configured to write the contextCSN into
   the underlying database to minimize  recovery  time  after  an  unclean
   shutdown.

   On  databases that support inequality indexing, it is helpful to set an
   eq index on the entryCSN attribute when using this overlay.

CONFIGURATION

   These slapd.conf options apply to  the  Sync  Provider  overlay.   They
   should appear after the overlay directive.

   syncprov-checkpoint <ops> <minutes>
          After  a  write operation has succeeded, write the contextCSN to
          the underlying database if <ops> write operations or  more  than
          <minutes>   time   have   passed   since  the  last  checkpoint.
          Checkpointing is disabled by default.

   syncprov-sessionlog <ops>
          Configures an in-memory session log  for  recording  information
          about   write  operations  made  on  the  database.   The  <ops>
          specifies the number of operations that are recorded in the log.
          All  write  operations  (except  Adds)  are recorded in the log.
          When using the session log, it is helpful to set an eq index  on
          the entryUUID attribute in the underlying database.

   syncprov-nopresent TRUE | FALSE
          Specify  that the Present phase of refreshing should be skipped.
          This value should only be set TRUE for a  syncprov  instance  on
          top  of  a  log  database  (such as one managed by the accesslog
          overlay).  The default is FALSE.

   syncprov-reloadhint TRUE | FALSE
          Specify that the overlay should honor the reloadHint flag in the
          Sync  Control.  In  OpenLDAP  releases  2.3.11  and  earlier the
          syncrepl consumer did not properly set this flag, so the overlay
          must ignore it. This option should be set TRUE when working with
          newer releases that properly support this flag. It must  be  set
          TRUE  when  using the accesslog overlay for delta-based syncrepl
          replication support.  The default is FALSE.

FILES

   /etc/ldap/slapd.conf
          default slapd configuration file

SEE ALSO

   slapd.conf(5),    slapd-config(5),    slapo-accesslog(5).      OpenLDAP
   Administrator's Guide.

ACKNOWLEDGEMENTS

   OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
   <http://www.openldap.org/>.   OpenLDAP   Software   is   derived   from
   University of Michigan LDAP 3.3 Release.



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