Modify sshd_config

To run the installation of Oracle Real Application Clusters (Oracle RAC), you must modify the configuration file, sshd_config so that X11 forwarding is enabled.

Run the following on racnode1 only.

Edit the sshd configuration file /etc/ssh/sshd_config and set the following parameters:

X11Forwarding yes
X11UseLocalhost no
X11DisplayOffset 10

Restart sshd:

# systemctl daemon-reload
# systemctl restart sshd

You do not need to repeat these steps on racnode2, because Oracle RAC installations are run from a single node.