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<samba:parameter name="idmap backend"
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advanced="1" developer="1" hide="1"
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xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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The idmap backend provides a plugin interface for Winbind to use
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varying backends to store SID/uid/gid mapping tables.
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This option specifies the default backend that is used when no special
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configuration set by <smbconfoption name="idmap config"/> matches the
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This default backend also specifies the place where winbind-generated
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idmap entries will be stored. So it is highly recommended that you
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specify a writable backend like <citerefentry>
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<refentrytitle>idmap_tdb</refentrytitle> <manvolnum>8</manvolnum>
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</citerefentry> or <citerefentry>
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<refentrytitle>idmap_ldap</refentrytitle> <manvolnum>8</manvolnum>
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</citerefentry> as the idmap backend. The <citerefentry>
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<refentrytitle>idmap_rid</refentrytitle> <manvolnum>8</manvolnum>
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</citerefentry> and <citerefentry>
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<refentrytitle>idmap_ad</refentrytitle> <manvolnum>8</manvolnum>
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</citerefentry> backends are not writable and thus will generate
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unexpected results if set as idmap backend.
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To use the rid and ad backends, please specify them via the
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<smbconfoption name="idmap config"/> parameter, possibly also for the
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domain your machine is member of, specified by <smbconfoption
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<para>Examples of SID/uid/gid backends include tdb (<citerefentry>
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<refentrytitle>idmap_tdb</refentrytitle><manvolnum>8</manvolnum></citerefentry>),
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ldap (<citerefentry><refentrytitle>idmap_ldap</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry>), rid (<citerefentry>
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<refentrytitle>idmap_rid</refentrytitle><manvolnum>8</manvolnum></citerefentry>),
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and ad (<citerefentry><refentrytitle>idmap_ad</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry>).
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<value type="default">tdb</value>