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CentOS is RHEL without the Red Hat branding. If something works Red Hat X.X it should work on CentOS X.X. CentOS is actually sponsored by Red Hat since a couple of years ago. New versions are released shortly after a new RHEL release. Red Hat Linux 9 is an open source Linux distribution, the last version of the award winning operating system before the project was splitted into the free Fedora Linux project and the commercial Red Hat Enterprise Linux (RHEL) product. Distributed as installable-only ISO images.
More Linux resources
Editor's note: Modifying Red Hat Enterprise Linux installation media is not a supported process, but this handy workaround may be useful to you. Please see this solution on the Red Hat Customer Portal for more information and other options that you may wish to consider for your environment.
Not everyone has high-speed network connections to locations where they need to install Red Hat Enterprise Linux (RHEL). Customers often ask how they can reduce the installation media to make delivery over slower networks faster. I walk you through the steps to build a custom, small RHEL installation ISO. The default RHEL 7.8 ISO is over 4GB in size; these steps show you how to create a RHEL 7.8 ISO that is 1GB in size and supports a smaller RHEL installation.
Step 1: Build a RHEL 7.8 system with the desired package set
Use any installation method to install/configure RHEL 7.8 to the desired state. I built one with the 'minimum' package option using the graphical installer. After rebooting, create a list of all installed RPM packages so you can use that list as the source to build a customized smaller ISO. This source list of RPMs ensures our new smaller ISO has only the packages needed to install, thus reducing the overall size of the ISO required for installation.
The build RPM list is used as the source of the package list in Step 2:
Copy rpmlist.txt to your ISO build system directory in Step 2.
Step 2: Build a small ISO
The following instructions build the small ISO directory structure, copy contents from the RPM list provided in Step 1, and then generate a small ISO file to be used for installation.
1. Download the RHEL7.8 Binary ISO:
2. Loop mount it so we can copy its contents to a location to manipulate:
3. Create a working directory structure and copy the master ISO contents:
4. Remove all existing packages:
5. Remove all add-ons (optional):
6. Copy the RPM list from the RPM list text file generated from Step 1 to /mnt/rhel7.8-small/Packages/:
7. Make the ISO:
Install the following ISO tooling:
8. Implant an MD5 sum into the ISO:
9. Convert the ISO image to be compatible for a USB boot image:
Step 3: Update ISO with latest RPMs from Satellite 6 Content View
If you have Satellite 6, you can use the yumdownloader utility to download updated content from a Satellite Content View. This generates a small ISO updated with the latest content, which alleviates the need to immediately patch your system after deployment.
Install yumdownloader, download the updated content, and create a new updated small ISO.
1. Install the yum-utils plugin:
2. Download the latest RPMs from Satellite 6 Content View. This assumes the system is currently registered and subscribed to an updated Content View in Satellite 6:
Use the RPM list created in Step 1 as a source in a for-loop to download only the x86_64 architecture packages, and ensure you exclude any i686 packages:
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3. Copy the updated RPMs to the Packages directory structure, then recreate the RPM metadata:
4. Make the updated ISO:
5. Implant an MD5 sum into the ISO:
6. Convert the ISO image to be compatible as a USB boot image:
Wrap up
In summary, by reducing the number of packages to only those required for the desired installation, one can significantly shrink the size of the installation media ISO file. This size reduction can enable faster deployment or staging times when dealing with slow network connection speeds.
[ Free online course: Red Hat Enterprise Linux technical overview. ]
Related Content
Creating a Local Yum Repository on Red Hat Enterprise Linux 6 (mounting CD Rom / ISO image)
Before going in details how to create local YUM repository… little information about YUM.
YUM – Yellowdog Updater, Modified (yum) is an open-source command-line package management utility.
Yum is the primary tool for installing, deleting, querying and managing Red Hat Enterprise Linux RPM software packages from Official as well as third party repositories.
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Mount CD ROM as local repository inRed Hat Enterprise Linux 6
Please put the Red hat 6 DVD inside CDROM. Open terminal and go to root prompt
now to save and exit from vi editor command is :wq
Done !
Mount the ISO image file as local repository inRed Hat Enterprise Linux 6
Before going in details… little information about ISO.
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ISO Image – It's a type of disk image file composed of the data contents from every written sector on an optical disc. Uploadhaven com.
- Redhat 6.10 Iso Download
- Red Hat 6 Iso Image Download
- Redhat 6.8 Iso Download
- Red Hat 6 Iso Image Download Free
- Download Redhat Linux Iso Image
- Redhat Iso Download
CentOS is RHEL without the Red Hat branding. If something works Red Hat X.X it should work on CentOS X.X. CentOS is actually sponsored by Red Hat since a couple of years ago. New versions are released shortly after a new RHEL release. Red Hat Linux 9 is an open source Linux distribution, the last version of the award winning operating system before the project was splitted into the free Fedora Linux project and the commercial Red Hat Enterprise Linux (RHEL) product. Distributed as installable-only ISO images.
More Linux resources
Editor's note: Modifying Red Hat Enterprise Linux installation media is not a supported process, but this handy workaround may be useful to you. Please see this solution on the Red Hat Customer Portal for more information and other options that you may wish to consider for your environment.
Not everyone has high-speed network connections to locations where they need to install Red Hat Enterprise Linux (RHEL). Customers often ask how they can reduce the installation media to make delivery over slower networks faster. I walk you through the steps to build a custom, small RHEL installation ISO. The default RHEL 7.8 ISO is over 4GB in size; these steps show you how to create a RHEL 7.8 ISO that is 1GB in size and supports a smaller RHEL installation.
Step 1: Build a RHEL 7.8 system with the desired package set
Use any installation method to install/configure RHEL 7.8 to the desired state. I built one with the 'minimum' package option using the graphical installer. After rebooting, create a list of all installed RPM packages so you can use that list as the source to build a customized smaller ISO. This source list of RPMs ensures our new smaller ISO has only the packages needed to install, thus reducing the overall size of the ISO required for installation.
The build RPM list is used as the source of the package list in Step 2:
Copy rpmlist.txt to your ISO build system directory in Step 2.
Step 2: Build a small ISO
The following instructions build the small ISO directory structure, copy contents from the RPM list provided in Step 1, and then generate a small ISO file to be used for installation.
1. Download the RHEL7.8 Binary ISO:
2. Loop mount it so we can copy its contents to a location to manipulate:
3. Create a working directory structure and copy the master ISO contents:
4. Remove all existing packages:
5. Remove all add-ons (optional):
6. Copy the RPM list from the RPM list text file generated from Step 1 to /mnt/rhel7.8-small/Packages/:
7. Make the ISO:
Install the following ISO tooling:
8. Implant an MD5 sum into the ISO:
9. Convert the ISO image to be compatible for a USB boot image:
Step 3: Update ISO with latest RPMs from Satellite 6 Content View
If you have Satellite 6, you can use the yumdownloader utility to download updated content from a Satellite Content View. This generates a small ISO updated with the latest content, which alleviates the need to immediately patch your system after deployment.
Install yumdownloader, download the updated content, and create a new updated small ISO.
1. Install the yum-utils plugin:
2. Download the latest RPMs from Satellite 6 Content View. This assumes the system is currently registered and subscribed to an updated Content View in Satellite 6:
Use the RPM list created in Step 1 as a source in a for-loop to download only the x86_64 architecture packages, and ensure you exclude any i686 packages:
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3. Copy the updated RPMs to the Packages directory structure, then recreate the RPM metadata:
4. Make the updated ISO:
5. Implant an MD5 sum into the ISO:
6. Convert the ISO image to be compatible as a USB boot image:
Wrap up
In summary, by reducing the number of packages to only those required for the desired installation, one can significantly shrink the size of the installation media ISO file. This size reduction can enable faster deployment or staging times when dealing with slow network connection speeds.
[ Free online course: Red Hat Enterprise Linux technical overview. ]
Related Content
Creating a Local Yum Repository on Red Hat Enterprise Linux 6 (mounting CD Rom / ISO image)
Before going in details how to create local YUM repository… little information about YUM.
YUM – Yellowdog Updater, Modified (yum) is an open-source command-line package management utility.
Yum is the primary tool for installing, deleting, querying and managing Red Hat Enterprise Linux RPM software packages from Official as well as third party repositories.
Red Hat 6 Iso Image Download
Mount CD ROM as local repository inRed Hat Enterprise Linux 6
Please put the Red hat 6 DVD inside CDROM. Open terminal and go to root prompt
now to save and exit from vi editor command is :wq
Done !
Mount the ISO image file as local repository inRed Hat Enterprise Linux 6
Before going in details… little information about ISO.
Redhat 6.8 Iso Download
ISO Image – It's a type of disk image file composed of the data contents from every written sector on an optical disc. Uploadhaven com.
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it's now mounted the Red hat 6 iso image file
Now create a new local.repo file and add the local repository path.
now to save and exit from vi editor command is :wq
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Let's add an entry in /etc/fstab so that the system always mounts the DVD image after a restart of machine.
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