INS-40980 Installer has detected that alias names is specified for the following nodes

 Problem:

Getting the following error when installing a new 19c Grid Infrastructure installation on two RAC nodes:

[INS-40980] Installer has detected that alias names is specified for the following nodes:

 

Analysis:

Regardless of the grammar mistake in the error message; where "is" should be replaced with "are" 😄 Most probably, this issue happens due to wrong configuration of user equivalency file settings under ~/.ssh directory on any of the cluster nodes.

Solution:

[On both Nodes: As the Grid Infrastructure OS user owner]

1- Cleanup the files under ~/.ssh 

# rm -f ~/.ssh/*

[On one Node only: As the Grid Infrastructure OS user owner]

2- Set up the user equivalency between RAC nodes using sshUserSetup.sh under the extracted Grid Infrastructure home, specifying node name (in green):

# /u01/grid/19c/oui/prov/resources/scripts/sshUserSetup.sh -user grid  -hosts "node1 node2" -noPromptPassphrase -confirm -advanced

It will verify the connectivity between the specified nodes, then will prompt you to Enter the Grid Infrastructure OS user owner password for each node. In my case, I've to enter it two times.

3- You may either need to close and open the Installer again or restart the RAC candidate nodes.