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Overview It is possible to upgrade an Oracle Linux 6 system to Oracle Linux 7.6 under the following conditions: The system meets the minimum installation requirements for Oracle Linux 7 as described in Chapter 1, System Requirements and Limits. The Oracle Linux 6 system has been completely updated from the ol6_x86_64_latest channel or ol6_latest repository. UEK R3 or UEK R4 has been installed on the system to be upgraded and is the default boot kernel. Upgrading from UEK R2 is not supported. Note that the system is upgraded to use the UEK R5 release provided with Oracle Linux 7.6. Upgrading is supported only for systems that are installed with the Minimal Install base environment. If additional packages are installed from an alternative repository or channel, upgrade might fail or the resulting upgrade might not function as expected. reference: https://docs.oracle.com/en/operating-systems/oracle-linux/7/relnotes7.6/ol7-install.html#ol7-upgrade-ol6 Verifying the system before Upgrade: #

Overview Basically in the production system graphical user interface as well as other heavy-weight browsers like firefox, google-chrome is not present for resource optimization. So, in that case, if you want to browse some web pages you can choose some alternative light-weight browser that runs through the terminal, which is suitable in many cases to serve your purpose. In that article, we discuss some of the popular command line browsers and installation processes on RHEL 9. ০1: lynx lynx – a general purpose distributed information browser for the World Wide Web. On RHEl 9, this package reside on rhel-9-for-x86_64-appstream-rpms repository. Enable this repository and instal. # sudo dnf install lynx Open the lynx browser from your terminal. # lynx press G and enter desire URL for browse or directly you can open any URL like. # lynx https://www.oracle.com/ ০2: links links – like alternative character mode WWW browser. On RHEl 9, this package reside on epel repository. Enable this rep

Overview The Leapp utility is a framework for updating and upgrading operating systems as well as applications. The operations of this utility consist of two phases 1. the preupgrade Phase – that chack the upgrade possibilities and 2. the actual upgrade phase – that map packages between previous and current versions of the software packages. Verifying the system before the Upgrade: # head -1 /etc/* rel * # uname -r # sudo grubby --default-kernel Step 1: Preparing for the Upgrade 01. If you are upgrading a remote system, ensure remote connection through a console such as VNC. 02. Ensure the system backup to avoid any kind of loss such as data, application, configuration, etc. 03. Shut down all production services such as application, database, corn jobs, etc. 04. Disable Secure Boot if it is running. To check the status of Secure Boot, choose one of the following commands: Using bootctl status, # sudo bootctl status Or using mokutil –sb-state, # sudo mokutil --sb-state If Secure Boot i

Overview The Leapp utility is a framework for updating and upgrading operating systems as well as applications. The operations of this utility consist of two phases 1. the preupgrade Phase – that chack the upgrade possibilities and 2. the actual upgrade phase – that map packages between previous and current versions of the software packages. Issue – 01: After running ‘ sudo leapp preupgrade ‘ sometimes you find the below issue in ‘ /var/log/leapp/leapp-report.txt ‘. Detail: Risk Factor: high (inhibitor) Title: Leapp detected loaded kernel drivers which have been removed in RHEL 8. Upgrade cannot proceed. Summary: Support for the following RHEL 7 device drivers has been removed in RHEL 8: – pata_acpi Key: f08a07da902958defa4f5c2699fae9ec2eb67c5b Remediation: 1. Disable detected kernel drivers in order to proceed with the upgrade process using the rmmod or modprobe -r . rmmod – Simple program to remove a module from the Linux Kernel modprobe – Add and remove modules from the Linux Ke