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The version of winbind included with Samba 3.0 and later can act as an AD
client.  To set this up using authconfig, you'll need an account in the
directory which has the privileges necessary to create computer accounts in
the directory.

An AD client requires SMB, Kerberos, and winbind-specific configuration
settings to be made in /etc/krb5.conf and /etc/samba/smb.conf, and authconfig
includes some additional switches for controlling these settings.

authconfig --kickstart \
	--smbworkgroup=TEST \
	--smbservers=server1.test.example.com \
	--smbrealm=TEST.EXAMPLE.COM \
	--smbsecurity=ads \
	--enablewinbind \
	--enablewinbindauth \
	--winbindtemplateshell=/bin/bash \
	--winbindjoin=USER[%PASSWORD]

The --smbworkgroup, --smbservers, and --smbsecurity options are used to
configure the default workgroup, password server, and security settings
in /etc/samba/smb.conf, and in case smbsecurity is set to "ads", a realm
in /etc/krb5.conf.

The --enablewinbind option lists 'winbind' as a naming source in
/etc/nsswitch.conf, and the --enablewinbindauth option enables
pam_winbind.so as an authentication option in /etc/pam.d/system-auth.

Authconfig does not configure any way to supply user home directories,
which may be on a network store or created as needed by pam_mkhomedir.

The pam_winbind module does not create a krb5 ccache file, so users
who log in via pam_winbind will not automatically be able access any
services which authenticate using Kerberos.  Using pam_krb5 instead
of pam_winbind for authentication currently requires additional
configuration beyond what authconfig provides.

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