RHEL – How to Upgrade from 7.3 to 8.1 Using ISO CD

linuxredhat

I wish to upgrade Rhel 7.3 to 8.1 by using an iso cd. I mount it to /home/cdrom
This iso contains the following directories:
BaseOS
AppStream
RPM-GPG-KEY-redhat-release, and so on

I got one repo file called /etc/yum.repos.d/rhel8.repo. This contains:

[rhel8-Server]
mediaid=78347539434.4444
name=RHEL8-Server
baseurl=file:///home/cdrom/AppStream
gpgkey=file:///home/cdrom/RPM-GPG-KEY-redhat-release
enabled=1
gpgcheck=1

Then I executed yum update but it didn't work. I also tried with baseurl=file:///home/cdrom/BaseOS but there's no results. I got result messages such like 'You could try using –skip-broken to work around the problem' or 'Error: Invalid version flag: if'. What can I do?

Best Answer

To keep a RedHat System which is disconnected up-to-date, you have to respect the way how RHEL will be supported.

To update the systems, which being disconnected, please follow the MANUAL of RedHat

Update an Offline System

Follow this Guide from the Vendor
https://access.redhat.com/solutions/29269

Upgrade an Offline System

To Offline Upgrade to RHEL 8, it's only accessible by Subscription Owners, besides i dont own RHEL so, I don't own that, but I think this will solve your issue

https://access.redhat.com/solutions/5492401

Remind, RHEL will need to have a valid Subscription to being used.

Related Solutions

How to Check Your RHEL Version

You can use the lsb_release command on various Linux distributions:

lsb_release -i -r

This will tell you the Distribution and Version and is a little bit more accurate than accessing files that may or may not have been modified by the admin or a software package. As well as working across multiple distros.

For RHEL, you should use:

cat /etc/redhat-release

Linux – Transaction Check Error: file from install of oraclelinux-release-6:6Server-3.0.2.x86_64 conflicts with file from package

Try the following:

yum install --downloadonly oraclelinux-release
find /var/cache/yum/ -type f -name "oraclelinux-release*rpm" \ 
   -exec rpm -Uvh --force {} \;

First command will download the package you want to install, but won't try to install it. Package will be saved under /var/cache/yum.

Second command will find the downloaded rpm, and force installing it.

To make your system sane again, you could do this afterwards:

rpm -e --nodeps rhn-client-tools
find /var/cache/yum/ -type f -name "oraclelinux-release*" \
  -exec rpm -Uvh --force {} \;

This will remove rhn-client-tools, which is obviously a part of RedHat installation and not Oracle Unbreakable Linux, and afterwards you'll install the oraclelinux-release package once more just in case removal of rhn-client-tools removed anything significant.

Note: do not do this without testing if you're not feeling comfortable with rpm/yum.