修改oracle RAC public hostname ,ip

% $CRS_HOME/bin/oifcfg/oifcfg delif -global <if_name>[/<subnet>]
% $CRS_HOME/bin/oifcfg/oifcfg setif -global <if_name>/<subnet>:public

For example:
% $CRS_HOME/bin/oifcfg delif -global eth0/10.2.156.0
% $CRS_HOME/bin/oifcfg setif -global eth0/10.2.166.0:public

Make the change at OS layer and restart Oracle Clusterware. This can be done in rolling fashion.

Once public network is changed, its associated VIP and SCAN VIP are also required to change, refer to CASE IV and CASE V.