[gpadmin@test-4 ~]$ ssh-keygen
[gpadmin@test-4 ~]$ ssh-copy-id gpadmin@gp10g_4
[gpadmin@test-4 ~]$ ssh-copy-id gpadmin@gp10g_6
[gpadmin@test-4 ~]$ ssh-copy-id gpadmin@gp10g_7