Scenario - ORACLE Database was already running and hostname was TESTDB. While installation of OEM 13c Agent, below error was coming during prerequisite check.
Performing check for CheckHostName
Is the host name valid?
value of oracle_hostname:192.168.0.1
value of hostname is: TESTDB
Expected result: Fully qualified domain name, for example foo.mydomain.com
Actual Result: 192.168.0.1. Ensure that you provide a fully qualified domain name.
Check complete. The overall result of this check is: Failed <<<<
Check complete: Failed <<<<
Problem: The host name specified for the installation or retrieved from the system is incorrect.
Recommendation: Ensure that your host name meets the following conditions:
(1) Does NOT contain localhost.localdomain.
(2) Does NOT contain any IP address.
(3) Ensure that the /etc/hosts file has the host details in the following format.
<IP address> <host.domain> <short hostname>
If you do not have the permission to edit the /etc/hosts file,
then while invoking the installer pass the host name using the argument ORACLE_HOSTNAME.
Solution [Worked]: We edited /etc/hosts file and made one entry as below without changing hostname of the system -
192.168.0.1 testdb.oracle.com
And then executed again the Agent Installation on Windows 2008 R2 64 Bit System and it got succeeded and Agent was installed successfully although the installation process was taking TESTDB only as hostname but for prerequisite validation, it validated with fully qualified name testdb.oracle.com.
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