Join in Active Directory Domain2021/04/29

Join in Windows Active Directory Domain with Realmd.

This tutorial needs Windows Active Directory Domain Service in your LAN.
This example shows to configure on the environment below.

Domain Server	: Windows Server 2019
Domain Name	: srv.world
Hostname	: fd3s.srv.world
NetBIOS Name	: FD3S01
Realm	: SRV.WORLD

[1]

Install some required packages.

root@dlp:~#

apt -y install realmd sssd sssd-tools libnss-sss libpam-sss adcli samba-common-bin oddjob oddjob-mkhomedir packagekit

[2]	Join in Windows Active Directory Domain.

# change DNS settings to refer to AD

root@dlp:~#

vi /etc/netplan/01-netcfg.yaml

    nameservers:
        addresses: [10.0.0.100]

root@dlp:~#

netplan apply

# discover Active Directory domain

root@dlp:~#

realm discover SRV.WORLD

srv.world
  type: kerberos
  realm-name: SRV.WORLD
  domain-name: srv.world
  configured: no
  server-software: active-directory
  client-software: sssd
  required-package: sssd-tools
  required-package: sssd
  required-package: libnss-sss
  required-package: libpam-sss
  required-package: adcli
  required-package: samba-common-bin

# join in Active Directory domain

root@dlp:~#

realm join SRV.WORLD

Password for Administrator:

# AD Administrator password

# verify it's possible to get an AD user info or not

root@dlp:~#

id Serverworld@srv.world

uid=691201105(serverworld@srv.world) gid=691200513(domain users@srv.world) groups=691200513(domain users@srv.world),691200572(denied rodc password replication group@srv.world),691200512(domain admins@srv.world)

# change setting if need

root@dlp:~#

vi /etc/pam.d/common-session

# add to the end (create Home Dir automatically when initial login)

session optional        pam_mkhomedir.so skel=/etc/skel umask=077

# verify it's possible to login as an AD user or not

root@dlp:~#

exit

logout

Ubuntu 21.04 dlp.srv.world ttyS0

dlp login: serverworld@srv.world
Password:
Welcome to Ubuntu 21.04 (GNU/Linux 5.11.0-16-generic x86_64)

.....
.....

Creating directory '/home/serverworld@srv.world'.
serverworld@srv.world@dlp:~$     # logined

[3]	If you'd like to omit domain name for AD user, configure like follows.

root@dlp:~#

vi /etc/sssd/sssd.conf

# line 15 : change

use_fully_qualified_names =

False

root@dlp:~#

systemctl restart sssd

root@dlp:~#

id Administrator

uid=199600500(administrator) gid=199600513(domain users) groups=199600513(domain users),199600572(denied rodc password replication group),199600519(enterprise admins),199600518(schema admins),199600520(group policy creator owners),199600512(domain admins)

[4]	AD users UID/GID are asigned randomly, but if you'd like to asign fixed UID/GID, configure like follows. Add UNIX attributes to AD accounts first, refer to here. This example is based on the environment AD accounts have [uidNumber/gidNumber] attributes. Next, change SSSD settings.

root@dlp:~#

vi /etc/sssd/sssd.conf

# line 16 : change

ldap_id_mapping =

False

# add to the end

ldap_user_uid_number = uidNumber
ldap_user_gid_number = gidNumber

# clear cache and restart sssd

root@dlp:~#

rm -f /var/lib/sss/db/*

root@dlp:~#

systemctl restart sssd

root@dlp:~#

id serverworld

uid=5000(serverworld) gid=5000 groups=5000

Matched Content