Ubuntu Manpage: realmd.conf - Tweak behavior of realmd

NAME

       realmd.conf - Tweak behavior of realmd

CONFIGURATION FILE

       realmd can be tweaked by network administrators to act in specific ways. This is done by placing settings
       in a /etc/realmd.conf. This file does not exist by default. The syntax of this file is the same as an INI
       file or Desktop Entry file.

       In general, settings in this file only apply at the point of joining a domain or realm. Once the realm
       has been setup the settings have no effect. You may choose to configure SSSD[1] or Winbind[2] directly.

       Only specify the settings you wish to override in the /etc/realmd.conf file. Settings not specified will
       be loaded from their packaged defaults. Only override the settings below. You may find other settings if
       you look through the realmd source code. However these are not guaranteed to remain stable.

       There are various sections in the config file. Some sections are global topic sections, and are listed
       below. Other sections are specific to a given realm. These realm specific sections should always contain
       the domain name in lower case as their section header.

       Examples of each setting is found below, including the header of the section it should be placed in.
       However in the resulting file only include each section once, and combine the various section setting
       together as lines underneath the section. For example

           [users]
           default-home = /home/%U
           default-shell = /bin/bash

ACTIVE-DIRECTORY

These options should go in an [active-directory] section of the /etc/realmd.conf file. Only specify the
settings you wish to override.

default-client
Specify the default-client setting in order to control which client software is the preferred default
for use with Active Directory.

[active-directory]
default-client = sssd
# default-client = winbind

The default setting for this is sssd which uses SSSD[1] as the Active Directory client. You can also
specify winbind to use Samba Winbind[2].

Some callers of realmd such as the realm command line tool allow specifying which client software
should be used. Others, such as GNOME Control Center, simplify choose the default.

You can verify the preferred default client softawre by running the following command. The realm with
the preferred client software will be listed first.

$ realm discover domain.example.com
domain.example.com
configured: no
server-software: active-directory
client-software: sssd
type: kerberos
realm-name: AD.THEWALTER.LAN
domain-name: ad.thewalter.lan
domain.example.com
configured: no
server-software: active-directory
client-software: winbind
type: kerberos
realm-name: AD.THEWALTER.LAN
domain-name: ad.thewalter.lan

os-name
(see below)

os-version
Specify the os-name and/or os-version settings to control the values that are placed in the computer
account operatingSystem and operatingSystemVersion attributes.

This is an Active Directory specific option.

[active-directory]
os-name = Gentoo Linux
os-version = 9.9.9.9.9

SERVICE

       These options should go in an [service] section of the /etc/realmd.conf file. Only specify the settings
       you wish to override.

       automatic-install
           Set this to no to disable automatic installation of packages via package-kit.

               [service]
               automatic-install = no
               # automatic-install = yes

USERS

These options should go in an [users] section of the /etc/realmd.conf file. Only specify the settings you
wish to override.

default-home
Specify the default-home setting in order to control how to set the home directory for accounts that
have no home directory explicitly set.

[users]
default-home = /home/%U@%D
# default-home = /nfs/home/%D-%U
# default-home = /home/%D/%U

The default setting for this is /home/%U@%D. The %D format is replaced by the domain name. The %U
format is replaced by the user name.

You can verify the home directory for a user by running the following command.

$ getent passwd 'DOMAIN/User'
DOMAIN\user:*:13445:13446:Name:/home/DOMAIN/user:/bin/bash
Note that in the case of IPA domains, most users already have a home directory configured in the
domain. Therefore this configuration setting may rarely show through.

default-shell
Specify the default-shell setting in order to control how to set the Unix shell for accounts that
have no shell explicitly set.

[users]
default-shell = /bin/bash
# default-shell = /bin/sh

The default setting for this is /bin/bash shell. The shell should be a valid shell if you expect the
domain users be able to log in. For example it should exist in the /etc/shells file.

You can verify the shell for a user by running the following command.

$ getent passwd 'DOMAIN/User'
DOMAIN\user:*:13445:13446:Name:/home/DOMAIN/user:/bin/bash
Note that in the case of IPA domains, most users already have a shell configured in the domain.
Therefore this configuration setting may rarely show through.

REALM SPECIFIC SETTINGS

These options should go in an section with the same name as the realm in the /etc/realmd.conf file. For
example for the domain.example.com domain the section would be called [domain.example.com]. To figure out
the canonical name for a realm use the realm command:

$ realm discover --name DOMAIN.example.com
domain.example.com
...

Only specify the settings you wish to override.

computer-ou
Specify this option to create directory computer accounts in a location other than the default. This
currently only works with Active Directory domains.

[domain.example.com]
computer-ou = OU=Linux Computers,DC=domain,DC=example,DC=com
# computer-ou = OU=Linux Computers,

Specify the OU as an LDAP DN. It can be relative to the Root DSE, or a complete LDAP DN. Obviously
the OU must exist in the directory.

It is also possible to use the --computer-ou argument of the realm command to create a computer
account at a specific OU.

user-prinicpal
Set the user-prinicpal to yes to create userPrincipalName attributes for the computer account in the
realm, in the form host/computer@REALM

[domain.example.com]
user-principal = yes

automatic-join
This option only applies to Active Directory realms. This option is off by default. In Active
Directory domains, a computer account can be preset with a known computer account password. This can
be used for automatic joins without authentication.

When automatic joins are used there is no mutual authentication between the machine and the domain
during the join process.

[domain.example.com]
automatic-join = yes

automatic-id-mapping
This option is on by default for Active Directory realms. Turn it off to use UID and GID information
stored in the directory (as-per RFC2307) rather than automatically generating UID and GID numbers.

This option only makes sense for Active Directory realms.

[domain.example.com]
automatic-id-mapping = no
# automatic-id-mapping = yes

manage-system
This option is on by default. Normally joining a realm affects many aspects of the configuration and
management of the system. Turning this off limits the interaction with the realm or domain to
authentication and identity.

[domain.example.com]
manage-system = no
# manage-system = yes

When this option is turned on realmd defaults to using domain policy to control who can log into this
machine. Further adjustments to login policy can be made with the realm permit command.

fully-qualified-names
This option is on by default. If turned off then realm user and group names are not qualified their
name. This may cause them to conflict with local user and group names.

[domain.example.com]
fully-qualified-names = no
# fully-qualified-names = yes

AUTHOR

       Stef Walter <stef@thewalter.net>
           Maintainer

NOTES

        1. SSSD
           https://fedorahosted.org/sssd/

        2. Winbind
           http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/winbind.html

realmd                                             01/27/2016                                     REALMD.CONF(5)