After installation, if you need to modify the Oracle Clusterware configuration, then you must unlock the Grid home. Review this information about unlocking the Grid home.

For example, if you want to apply a one-off patch, or if you want to modify an Oracle Exadata configuration to run IPC traffic over RDS on the interconnect instead of using the default UDP, then you must unlock the Grid home.

Unlock the home using the following procedure:

1. Change directory to the path Grid_home/crs/install, where Grid_home is the path to the Grid home, and unlock the Grid home using the command rootcrs.sh -unlock. For example, with the Grid home /u01/app/12.2.0/grid, enter the following command:

   # cd /u01/app/12.2.0/grid/crs/install
   # rootcrs.sh -unlock
   

2. Change user to the Oracle Grid Infrastructure software owner, and relink binaries using the command syntax make -f Grid_home/rdbms/lib/ins_rdbms.mk target, where Grid_home is the Grid home, and target is the binaries that you want to relink. For example, where the grid user is grid, $ORACLE_HOME is set to the Grid home, and where you are updating the interconnect protocol from UDP to IPC, enter the following command:

   # su grid
   $ make -f $ORACLE_HOME/rdbms/lib/ins_rdbms.mk ipc_rds ioracle

   Note:

   To relink binaries, you can also change to the grid installation owner and run the command Grid_home/bin/relink.

3. Relock the Grid home and restart the cluster as follows:

   # rootcrs.sh -lock
   # crsctl start crs

   Repeat steps 1 through 3 on each cluster member node.