Install Grid infrastructure from first node.

[root@rac1 ~]# xhost +
access control disabled, clients can connect from any host
[root@rac1 ~]# su - grid

[grid@rac1 ~]$ cd /home/grid/software/oracle/grid/
[grid@rac1 ~]$ ./runInstaller












Next, click the [SSH Connectivity] button. Enter the "OS Password" for the grid

user and click the [Setup] button. This will start the "SSH Connectivity" configuration

process: