[Oracle DataBase Server 12.1 installation on Oracle Linux 6.7]: Setup OS parameters before we start

Changing SELINUX parameters from enforcing to disabled

# sed -i.bkp.$(date +%Y-%m-%d) -e "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

Decrease delay after restart server. Server will not wait answer on question about kernel for starting and etc…

# sed -i.bkp.$(date +%Y-%m-%d) -e "s/timeout=5/timeout=0/g" /boot/grub/grub.conf

Disable firewall

# service iptables stop

Not allow to restart firewall service after restart server

# chkconfig iptables off