Samba-tool ldapcmp

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Introduction

samba-tool provides a subcommand for testing LDAP replication between Domain Controllers - regardless if they are running Samba or Windows or mixed.

Restrictions

  • The comparisation works via LDAP. So the LDAP server must be up and accessible at port 389.
  • It compares values of attributes of objects returned only by wild-card search so no hidden attributes are processed.
  • Certain attributes are explicitly ignored, these are non replicating attributes and they always have different values on the corresponding objects in separate DCs.

How to use?

  • Compare the entire directory on Domain Controller DC1 and DC2:
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator
  • Compare single AD partitions on Domain Controller DC1 and DC2:
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator domain
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator configuration
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator schema
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator dnsdomain
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator dnsforest

Filter non-synced attributes

  • Example without any filter on a perfectly working replication:
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator domain
 Password for [SAMDOM\administrator]:

* Comparing [DOMAIN] context...

* Objects to be compared: 308

Comparing:
'CN=Builtin,DC=samdom,DC=example,DC=com' [ldap://DC1]
'CN=Builtin,DC=samdom,DC=example,DC=com' [ldap://DC2]
    Attributes found only in ldap://DC1:
        serverState
    FAILED

Comparing:
'DC=samdom,DC=example,DC=com' [ldap://DC1]
'DC=samdom,DC=example,DC=com' [ldap://DC2]
    Attributes found only in ldap://DC1:
        serverState
        msDS-NcType
    FAILED

* Result for [DOMAIN]: FAILURE

SUMMARY
---------

Attributes found only in ldap://DC1:

    msDS-NcType
    serverState
ERROR: Compare failed: -1
  • And with the filter:
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator domain --filter=msDS-NcType,serverState
Password for [SAMDOM\administrator]:

* Comparing [DOMAIN] context...

* Objects to be compared: 308

* Result for [DOMAIN]: SUCCESS
  • An other attribute is not synced in the "CONFIGURATION" context: subrefs, so the correct check with the filter for the whole setup is:
# samba-tool ldapcmp ldap://DC1 ldap://DC2 -Uadministrator --filter=msDS-NcType,serverState,subrefs