[CentOS] Standard Dracut configuration file /etc/dracut.conf

Hi Centos Experts,

I want to have hands on /etc/dracut.conf file which standard centos
7.3 is using to create initrd.img present in the DVD ISO :
/isolinux/initrd.img

>From where can i get /etc/dracut.conf, so that i can create exact
replica of initrd.img which centos 7.3 is sending in DVD ISO. ?
Can any one please send me standard centos 7.3 dracut configuration?

My goal is to change some kernel configuration in standard centos 7.3
kernel. I will be adding some new drivers statically and will be
building new vmlinuz.

I will also be building initrd.img compatible with this new kernel
image. Then, i will copy these 2 newly formed images to /isolinux/ in
my dvd-iso-layout folder and try to make a new ISO. This ISO should
boot well. I need to prepare one complete ISO, which has my new
modified kernel and modified initrd

Currently, i am facing lot of errors in dracut. Not sure, what am i
missing in my initrd.img. Sometimes, it  says "/dev/root" does not
exist.

What command shall i use in centos 7.3 to make a new initrd.img which
i can transfer to my ISO for new installation?

Regards
Sudhanshu