Add Ubuntu 16.04 to Windows AD domain

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To add Ubuntu 16.04 to Windows AD domain use following steps:

1. Edit /etc/hosts to have FQDN including domain name as first hostname against 127.0.0.1
2. Restart machine
3. Verify new hostname is coming using hostname command
4. Setup correct search domain in /etc/resolv.conf using "search <domain>"
5. Disable DNSMASQ using NetworkManager by commenting "dns=dnsmasq" in /etc/Networkmanager/NetworkManager.conf
6. Then use:

   systemctl restart network-manager.service

7. Then DNS set via network-manager or sent by DHCP should be visible in /etc/resolv.conf file
8. Verify that SRV records for domain are accessible

   dig –t SRV _ldap._tcp.<domain> | grep –A2 "ANSWER SECTION"

9. Setup ntp to synchronize time with AD server
   1. sudo apt -y install ntp
   2. Edit /etc/ntp.conf. Comment Ubuntu ntp servers and add domain DC as ntp server using:

      server <domain-controller> iburst prefer

   3. sudo systemctl restart ntp.service
   4. Verify that ntp is working properly by using "ntpq -p"
   5. sudo apt -y install ntpstat
   6. Run "ntpstat" to verify syncing is working correctly
10. Install required packages

    sudo apt -y install realmd sssd adcli libwbclient-sssd krb5-user sssd-tools samba-common packagekit samba-common-bin samba-libs

    Enter domain name during package installation.

11. Edit /etc/realmd.conf so that it has

    [active-directory]
    os-name = Ubuntu Linux
    os-version = 16.04
    
    [service]
    automatic-install = yes
    
    [users]
    default-home = /home/%u
    default-shell = /bin/bash
    
    [bce.com]
    user-principal = yes
    fully-qualified-names = no

12. Use "realm discover" to discover AD domain
13. Create kerberos ticket to be used later for joining domain

    kinit -V <ad-username>

    With ad-username which has privileges to join a machine to domain. We can always use administrator, if access to administrator account is available.

14. Join domain using:

    sudo realm --verbose join -U <ad-username> <domain>

15. Test using:

    id <ad-username>

    to see if Ubuntu machine joined AD domain successfully or not.

Refer:

• http://www.wolffhaven45.com/blog/linux/join_ubuntu_workstation_windows_domain/

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