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During the node preparation, we created the OS user called grid to be the GI software owner. As the grid user on the first node, we will now install GI for the cluster. The OUI uses SSH to copy the binary files from this node to the other nodes during the installation. OUI can configure SSH for you during installation, and we will make use of that option for demonstration purposes.
Before we start the OUI, we need to ensure that an X display or VNC can be started on our terminal. A simple test would be to run xclock in the session from which we want to install to ensure that the clock appears successfully. If it does not, we should check your DISPLAY environment setting and check that non-root users can make a connection to the X server. This requires us to log into the machine on which the installer will run and execute xhost +.