The primary Admin Node acts as an SSH access point for other grid nodes. This means that after you log in to the command shell of the primary Admin Node, you can access any other grid node through SSH without entering the grid node’s password.
You are only prompted to enter the SSH Access Password. Optionally, you can enable passwordless access to grid nodes by starting ssh-agent. In this case, you are only prompted for the SSH Access Password once.
By default the SSH access point is installed with a password.
By default, the private key is located on the primary Admin Node. However, it might have been removed to prevent the Admin Node from acting as an SSH access point.
This must be done each time you log in to the primary Admin Node at the command line.