Patching and Switching Oracle Grid Infrastructure Homes

Use switchGridHome command to switch from the current Oracle Grid Infrastructure home to the patched Oracle Grid Infrastructure home.

You can use the switchGridHome command to switch between different RUs of the same release, for example from Oracle Grid Infrastructure 21.3 to Oracle Grid Infrastructure 21.4. You can also use the switchGridHome command to apply one-off patches.

Download the Release Updates (RUs) you want to apply from My Oracle Support.
As the grid user, download the Oracle Grid Infrastructure image files and extract the files into a new Oracle Grid Infrastructure home directory.
```
$ mkdir -p /u01/app/oracle/product/21.4.0/grid
$ chown grid:oinstall /u01/app/oracle/product/21.4.0/grid 
$ cd /u01/app/oracle/product/21.4.0/grid 
$ unzip -q download_location/grid.zip
```
Note:
The new Oracle Grid Infrastructure home path must be different from the current Oracle Grid Infrastructure home path.
Start the Oracle Grid Infrastructure installer with the -switchGridHome flag to switch to the patched Oracle Grid Infrastructure home after the installation and the optional -applyRU flag to apply Release Updates (RUs) during the installation.
```
$ /u01/app/oracle/product/21.4.0/grid/gridSetup.sh -switchGridHome [-applyRU patch_directory_location] 
[-applyOneOffs comma_seperated_list_of_patch_directory_locations]
```
Follow the steps in the configuration wizard to complete the Oracle Grid Infrastructure installation.
All Oracle Grid Infrastructure services start running from the new Grid home after the installation is complete.

Parent topic: Installing and Configuring Oracle Grid Infrastructure for a Standalone Server