dbt-06103 the port 1521 is already in use

CHANGES

 New database install on OL 7.3. (running on an OVM virtual machine)

CAUSE

the hostname is not reachable:

[root@db122 ~]# ping db122
ping: db122: Name or service not known

From 12.2 DB installation guide:

You can install Oracle Database on a non-networked computer. If the computer, such as a laptop, is configured for DHCP and you plan to connect the computer to the network after the Oracle Database installation, then use the ping command on the computer on which you want to install the database to check if the computer can connect to itself. Perform this step by first using only the host name and then using the fully qualified name, which should be in the /etc/hosts file.

SOLUTION

Qualify the short hostname into the /etc/hosts:

i.e modify

X.X.X.X db122.<domain>

to:

X.X.X.X db122.<domain> db122