When installing a CRS agent and using IP address instead of node name it is failing with error:
"Wrong CRS alert log path specified, or missing permissions to read the log file"
In the log file the following error appears:
ERROR [CRS-Node-Validation-1[192.168.1.1][2017/11/16 13:01:26]] com.quest.qsi.fason.oracle.installer.callback.crs.DBOInstallerUnixCrsNodeValidator - Wrong CRS log path, or no permissions to read it, on node [192.168.1.1] with CRS log path [/opt/oragrid11.2/log/192.168.1.1/alert.192.168.1.1.log]. Output = [false], error message = 
Please make sure that the IP address can be resolved into a host name.
Easiest way is to add the host name and IP to the .../ect/hosts file of the Foglight Agent Manager host.