REALMD.CONF(5) File Formats REALMD.CONF(5)NAMErealmd.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.
It is also possible to use the --os-name or --os-version argument
of the realm command to override the default values.
[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.
computer-name
This option only applied to Active Directory realms. Specify this
option to override the default name used when creating the computer
account. The system's FQDN will still be saved in the dNSHostName
attribute.
[domain.example.com]
computer-name = SERVER01
Specify the name as a string of 15 or fewer characters that is a
valid NetBIOS computer name.
It is also possible to use the --computer-name argument of the
realm command to override the default computer account name.
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 08/15/2016 REALMD.CONF(5)