Configuring DNS running on UNIX servers
If your environment is configured to use UNIX-based DNS servers instead of Active Directory-based DNS servers and the UNIX system is configured to use DHCP, the nameserver entry in /etc/resolv.conf file is set automatically to point to a DNS server.
If this DNS server is aware of the Active Directory domain you want to join, no further changes are needed. If the DNS server identified as a nameserver in the /etc/resolv.conf file is not aware of the domain you are trying to join, for example, because you are using a test domain or a separate evaluation environment, you need to either disable DHCP or manually set the location of the Active Directory domain controller in the Centrify configuration file.
In most cases, you can verify whether a UNIX computer can locate the domain controller and related services by running the ping command and verifying connectivity to the correct Active Directory domain controller or by checking the nameserver entry in the /etc/resolv.conf file. This nameserver entry should be the IP address of one of the domain controllers in the domain you want to join.
If the ping command is successful, it indicates the DNS server is aware of the Active Directory domain you want to join and no further changes are needed. If the ping command is not successful, you will need to take further action to resolve the issue.
Resolving issues in locating Active Directory domain controllers
If the UNIX computer cannot find the Active Directory domain controller, there are several ways you can resolve the issue. Depending on your environment and specific situation, you should consider doing one of the following:
- Set up DNS on the target Active Directory domain controller and the manually configure the nameserver entry in the /etc/resolv.conf file to use that domain controller as described in Setting up DNS service on a target domain controller.
- Set the Centrify configuration file to manually identify the domain controllers you want to use as described in Setting the domain controller in the configuration file.