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Samba HowTo Guide
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TDB Database File Information

This section contains brief descriptions of the databases that are used by Samba-3.

The directory in which Samba stores the tdb files is determined by compile-time directives. Samba-3 stores tdb files in two locations. The best way to determine these locations is to execute the following command:

root#  smbd -b | grep PRIVATE_DIR
   PRIVATE_DIR: /etc/samba/private

This means that the confidential tdb files are stored in the /etc/samba/private directory. Samba-3 also uses a number of tdb files that contain more mundane data. The location of these files can be found by executing:

root#  smbd -b | grep LOCKDIR
   LOCKDIR: /var/lib/samba

Therefore the remaining control files will, in the example shown, be stored in the /var/lib/samba directory.

The persistent tdb files are described in the Persistent TDB File Descriptions table. All persistent tdb files should be regularly backed up. Use the tdbbackup utility to backup the tdb files. All persistent tdb files must be preserved during machine migrations, updates and upgrades.

The temporary tdb files do not need to be backed up, nor do they need to be preseved across machine migrations, updates or upgrades. The temporary tdb files are described in the Temporary TDB File Descriptions.

Table1.1.Persistent TDB File Descriptions

Name Description
account_policy

Samba/NT account policy settings, includes password expiration settings.

group_mapping

Mapping table from Windows groups/SID to UNIX groups.

ntdrivers

Stores per-printer installed driver information.

ntforms

Stores per-printer installed forms information.

ntprinters

Stores the per-printer devmode configuration settings.

passdb

Exists only when the tdbsam passwd backend is used. This file stores the SambaSAMAccount information. Note: This file requires that user POSIX account information is availble from either the /etc/passwd file, or from an alternative system source.

registry

Read-only Samba database of a Windows registry skeleton that provides support for exporting various database tables via the winreg RPCs.

secrets

This file stores the Workgroup/Domain/Machine SID, the LDAP directory update password, and a further collection of critical environmental data that is necessary for Samba to operate correctly. This file contains very sensitive information that must be protected. It is stored in the PRIVARE_DIR directory.

share_info

Stores per-share ACL information.

winbindd_idmap

Winbindd's local IDMAP database.

Table1.2.Temporary TDB File Descriptions

Name Description Backup
brlock

Byte-range locking information.

No
connections

A temporary cache for current connection information used to enforce max connections.

no
eventlog/*tdb

Records of eventlog entries. In most circumstances this is just a cache of system logs.

no
gencache

Generic caching database for dead WINS servers and trusted domain data.

no
login_cache

A temporary cache for login information, in particular bad password attempts.

no
messages

Temporary storage of messages being processed by smbd.

no
netsamlogon_cache

Caches user net_info_3 structure data from net_samlogon requests (as a domain member).

no
perfmon/*.tdb

Performance counter information.

no
printing/*.tdb

Cached output from lpq command created on a per-print-service basis.

no
schannel_store

A confidential file, stored in the PRIVATE_DIR, containing crytographic connection information so that clients that have temporarily disconnected can reconnect without needing to renegotiate the connection setup process.

no
sessionid

Temporary cache for miscellaneous session information and for utmp handling.

no
unexpected

Stores packets received for which no process is actively listening.

no
winbindd_cache

Cache of Identity information received from an NT4 domain or from ADS. Includes user lists, etc.

yes
Samba HowTo Guide
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