Install18c - Little Hack - Tested on Red Hat 7.4

Installing oracle 18c software is pretty straight forward. see  http://www.dbarj.com.br/en/2018/02/installing-oracle-database-18-on-ol-7/

Creating oracle DB, just modify sample scripts below.

ORACLE_BASE=/u04/app/base
ORACLE_HOME=/u04/soft
ORACLE_SID=wro18c
export ORACLE_SID ORACLE_HOME ORACLE_BASE
export PATH=$ORACLE_HOME/bin:$PATH

dbca -silent -createDatabase  -templateName  General_Purpose.dbc  -gdbName wro18c -sid wro18c -sysPassword orcl  -systemPassword orcl -sampleSchema true -initParams _exadata_feature_on=true

Other interesting workaround...

using systemtap