Verifying and Creating a DC DNS Record: Difference between revisions
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= Domain Controller A Record = |
= Domain Controller A Record = |
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To verify that the A record for domain controller (DC) |
To verify that the A record for domain controller (DC) <code>DC2</code> using the IP address <code>10.99.0.2</code> is created in the <code>samdom.example.com</code> DNS zone, run on a domain member: |
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# host -t A <u>DC2</u>.samdom.example.com. |
# host -t A <u>DC2</u>.samdom.example.com. |
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Host DC2.samdom.example.com. not found: 3(NXDOMAIN) |
Host DC2.samdom.example.com. not found: 3(NXDOMAIN) |
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To manually add the A record for |
To manually add the A record for <code>DC2</code> to the DNS server running on <code>DC1</code>, run: |
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# samba-tool dns add DC1 samdom.example.com <u>DC2</u> A <u>10.99.0.2</u> -Uadministrator |
# samba-tool dns add DC1 samdom.example.com <u>DC2</u> A <u>10.99.0.2</u> -Uadministrator |
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== Determining a DCs objectGUID == |
== Determining a DCs objectGUID == |
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To determine the objectGUID value of the joined domain controller |
To determine the objectGUID value of the joined domain controller <code>DC2</code>, run on an existing DC: |
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# ldbsearch -H /usr/local/samba/private/sam.ldb '(invocationId=*)' --cross-ncs objectguid |
# ldbsearch -H /usr/local/samba/private/sam.ldb '(invocationId=*)' --cross-ncs objectguid |
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== Verifying and Creating the objectGUID Record == |
== Verifying and Creating the objectGUID Record == |
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To verify that the CNAME objectGUID record for domain controller (DC) |
To verify that the CNAME objectGUID record for domain controller (DC) <code>DC2</code> exists in the <code>_msdcs.samdom.example.com</code> DNS zone, run on a domain member: |
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# host -t CNAME <u>df4bdd8c-abc7-4779-b01e-4dd4553ca3e9</u>._msdcs.samdom.example.com. |
# host -t CNAME <u>df4bdd8c-abc7-4779-b01e-4dd4553ca3e9</u>._msdcs.samdom.example.com. |
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Host df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com. not found: 3(NXDOMAIN) |
Host df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com. not found: 3(NXDOMAIN) |
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To manually add the objectGUID CNAME record to the DNS server running on |
To manually add the objectGUID CNAME record to the DNS server running on <code>DC1</code>, use the objectGUID determined in section [[#Determining_a_DCs_objectGUID|Determining a DCs objectGUID]] and run: |
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# samba-tool dns add DC1 _msdcs.samdom.example.com <u>df4bdd8c-abc7-4779-b01e-4dd4553ca3e9</u> CNAME <u>DC2</u>.samdom.example.com -Uadministrator |
# samba-tool dns add DC1 _msdcs.samdom.example.com <u>df4bdd8c-abc7-4779-b01e-4dd4553ca3e9</u> CNAME <u>DC2</u>.samdom.example.com -Uadministrator |
Revision as of 15:39, 19 October 2016
Introduction
Samba currently does not create two important DNS records when you join a domain controller (DC) to a Samba AD. These records are required for the directory replication to work properly.
For more details, see Bug #10928.
Domain Controller A Record
To verify that the A record for domain controller (DC) DC2
using the IP address 10.99.0.2
is created in the samdom.example.com
DNS zone, run on a domain member:
# host -t A DC2.samdom.example.com. DC2.samdom.example.com has address 10.99.0.2
If the record is missing, the following error is displayed:
# host -t A DC2.samdom.example.com. Host DC2.samdom.example.com. not found: 3(NXDOMAIN)
To manually add the A record for DC2
to the DNS server running on DC1
, run:
# samba-tool dns add DC1 samdom.example.com DC2 A 10.99.0.2 -Uadministrator Password for [SAMDOM\administrator]: Record added successfully
The directory replication automatically distributes the new record to all DCs.
The objectGUID CNAME Record
Determining a DCs objectGUID
To determine the objectGUID value of the joined domain controller DC2
, run on an existing DC:
# ldbsearch -H /usr/local/samba/private/sam.ldb '(invocationId=*)' --cross-ncs objectguid # record 1 dn: CN=NTDS Settings,CN=DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samdom,DC=example,DC=com objectGUID: df4bdd8c-abc7-4779-b01e-4dd4553ca3e9 # record 2 dn: CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samdom,DC=example,DC=com objectGUID: 4a6bd92a-6612-4b15-aa8c-9ec371e8994f # returned 2 records # 2 entries # 0 referrals
Locate the objectGUID of the DC in the output.
Verifying and Creating the objectGUID Record
To verify that the CNAME objectGUID record for domain controller (DC) DC2
exists in the _msdcs.samdom.example.com
DNS zone, run on a domain member:
# host -t CNAME df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com. df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com is an alias for DC2.samdom.example.com.
If the record is missing, the following error is displayed:
# host -t CNAME df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com. Host df4bdd8c-abc7-4779-b01e-4dd4553ca3e9._msdcs.samdom.example.com. not found: 3(NXDOMAIN)
To manually add the objectGUID CNAME record to the DNS server running on DC1
, use the objectGUID determined in section Determining a DCs objectGUID and run:
# samba-tool dns add DC1 _msdcs.samdom.example.com df4bdd8c-abc7-4779-b01e-4dd4553ca3e9 CNAME DC2.samdom.example.com -Uadministrator Password for [SAMDOM\administrator]: Record added successfully
The directory replication automatically distributes the new record to all DCs.