root@2004:~# kinit administrator
Password for administrator@TEST.JP:
root@2004:~# net ads join -U administrator
Enter administrator's password:
Using short domain name -- TEST
Joined '2004' to dns domain 'test.jp'
No DNS domain configured for 2004. Unable to perform DNS Update.
DNS update failed: NT_STATUS_INVALID_PARAMETER
root@2004:~# systemctl restart winbind
root@2004:~# wbinfo -u
TEST\guest
TEST\administrator
TEST\krbtgt
TEST\chibi
root@2004:~# wbinfo -n chibi
S-1-5-21-3153889836-307192526-2969236381-1103 SID_USER (1)
root@2004:~# net ads info
LDAP server: 192.168.1.55
LDAP server name: dc1.test.jp
Realm: TEST.JP
Bind Path: dc=TEST,dc=JP
LDAP port: 389
Server time: 水, 06  5月 2020 11:41:09 JST
KDC server: 192.168.1.55
Server time offset: 0
Last machine account password change: 水, 06  5月 2020 11:40:26 JST
root@2004:~# smbclient -L localhost -U%

        Sharename       Type      Comment
        ---------       ----      -------
        netlogon        Disk
        sysvol          Disk
        print$          Disk      Printer Drivers
        IPC$            IPC       IPC Service (Samba 4.11.6-Ubuntu)
SMB1 disabled -- no workgroup available
root@2004:~# smbclient //192.168.1.51/netlogon -Uadministrator
Enter TEST\administrator's password:
Try "help" to get a list of possible commands.
smb: \> ls
  .                                   D        0  Tue May  5 18:07:50 2020
  ..                                  D        0  Tue May  5 18:07:50 2020

                58449919 blocks of size 4096. 44295516 blocks available
smb: \> exit
root@2004:~# smbclient //192.168.1.51/sysvol -Uadministrator
Enter TEST\administrator's password:
Try "help" to get a list of possible commands.
smb: \> ls
  .                                   D        0  Tue May  5 18:07:50 2020
  ..                                  D        0  Tue May  5 18:07:50 2020
  test.jp                             D        0  Tue May  5 18:07:50 2020

                58449919 blocks of size 4096. 44295516 blocks available
smb: \> exit
root@2004:~# cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
root@2004:~# samba -V
Version 4.11.6-Ubuntu
root@2004:~# net ads lookup
Information for Domain Controller: 192.168.1.55

Response Type: LOGON_SAM_LOGON_RESPONSE_EX
GUID: ecba8d0f-dd20-4ffe-ad1f-3f0c639b3eaa
Flags:
        Is a PDC:                                   no
        Is a GC of the forest:                      yes
        Is an LDAP server:                          yes
        Supports DS:                                yes
        Is running a KDC:                           yes
        Is running time services:                   yes
        Is the closest DC:                          yes
        Is writable:                                yes
        Has a hardware clock:                       no
        Is a non-domain NC serviced by LDAP server: no
        Is NT6 DC that has some secrets:            no
        Is NT6 DC that has all secrets:             yes
        Runs Active Directory Web Services:         yes
        Runs on Windows 2012 or later:              yes
Forest: test.jp
Domain: test.jp
Domain Controller: dc1.test.jp
Pre-Win2k Domain: TEST
Pre-Win2k Hostname: DC1
Server Site Name: Default-First-Site-Name
Client Site Name: Default-First-Site-Name
NT Version: 5
LMNT Token: ffff
LM20 Token: ffff
root@2004:~# dig test.jp

; <<>> DiG 9.16.1-Ubuntu <<>> test.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42014
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;test.jp.                       IN      A

;; ANSWER SECTION:
test.jp.                600     IN      A       192.168.1.55
test.jp.                600     IN      A       192.168.1.54
test.jp.                600     IN      A       192.168.1.51
test.jp.                600     IN      A       192.168.1.53

;; Query time: 0 msec
;; SERVER: 192.168.1.51#53(192.168.1.51)
;; WHEN: 水  5月 06 11:43:38 JST 2020
;; MSG SIZE  rcvd: 100

root@2004:~# wbinfo -t
checking the trust secret for domain TEST via RPC calls succeeded
root@2004:~# wbinfo -g
TEST\domain computers
TEST\cert publishers
TEST\domain users
TEST\domain guests
TEST\ras and ias servers
TEST\domain admins
TEST\schema admins
TEST\enterprise admins
TEST\group policy creator owners
TEST\allowed rodc password replication group
TEST\denied rodc password replication group
TEST\enterprise read-only domain controllers
TEST\cloneable domain controllers
TEST\protected users
TEST\key admins
TEST\enterprise key admins
TEST\domain controllers
TEST\read-only domain controllers
TEST\dnsadmins
TEST\dnsupdateproxy
root@2004:~# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: administrator@TEST.JP

Valid starting       Expires              Service principal
2020-05-06T11:40:05  2020-05-06T21:40:05  krbtgt/TEST.JP@TEST.JP
        renew until 2020-05-07T11:40:00
root@2004:~#