SLAPO-SYNCPROV(5)                      File Formats Manual                      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 Syn‐
       chronization (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 mem‐
       ory  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 data‐
              base  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  opera‐
              tions  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 man‐
              aged 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 work‐
              ing  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.openl‐
       dap.org/>.  OpenLDAP Software is derived from University of Michigan LDAP 3.3 Release.



OpenLDAP                                    2014/09/20                          SLAPO-SYNCPROV(5)