First you must decide the list of group(s) which you plan to install as part of your custom ISO.

In this method we will get the list of packages for an individual group using YUM or DNF and then copy those packages into BaseOS/AppStream directory respectively. Method 1: Getting list of packages using DNF/YUM I know of two methods which can be used to achieve this, you can add any more which you felt was more easier using the comment section. This is the most tricky part unless you are planning to use all the rpms from the original DVD (in which case you can copy the entire directory into /data/custom_iso in the previous step). But since we don't want to copy all the rpms from the original DVD, so we will exclude the folders which contains packages.ĪLSO READ: 10 practical examples to add or remove user from group in Linux Step 3: Create package list Next we need to have same directory structure as used in the original DVD. Mount: /mnt: WARNING: device write-protected, mounted read-only. I have already added the image on my Oracle VirtualBox VM and have mounted it on /mnt: ~]# mount /dev/sr0 /mnt

I will be using CentOS 8.2 for the demonstration of this article. But if you want to create custom ISO for RHEL/CentOS 7 then I would recommend to follow How to create customized bootable ISO image in RHEL/CentOS 7įirst of all you would need access to the original ISO DVD image which we will further customise and generate a small version of the same image with lesser rpm count. The steps from this article are verified for CentOS 8 but the same will also work for RHEL 8. The original DVD of RHEL/CentOS is quiet huge (around 9Gb for RHEL 8.3), in production environment we normally create our own custom ISO with reduced number of packages and deliver the same to our clients and customers. In this article I will share the steps to create custom ISO using original RHEL/CentOS image.

Centos iso