Upgrading your CentOS system from version 7 to version 8 involves a series of steps that ensure a smooth transition between the two releases. CentOS 8 introduced new features, improved performance, and enhanced security measures compared to CentOS 7.
If you need to upgrade from CentOS 7 to CentOS 8, this step-by-step guide will walk you through the process, ensuring a successful upgrade and minimal downtime.
Step 1: Backup Your Data
Before starting any significant system upgrade, it’s crucial to back up your important data. This backup will help you restore your system if anything goes wrong during the upgrade process.
You can use tools like rsync or tar to create backups of your essential files, directories, and databases.
sudo rsync -avz /path/to/your/data /path/to/backup/location
sudo tar czvf /path/to/backup/location/backup.tar.gz /path/to/your/data
Step 2: Update CentOS 7
Ensure your CentOS 7 system is up-to-date with the latest packages and security updates:
sudo yum update -y sudo yum upgrade -y
Step 3: Install the EPEL Repository (Optional)
Extra Packages for Enterprise Linux (EPEL) is a repository that contains additional packages for CentOS systems. If you have it installed on your CentOS 7 system, you should update it to the CentOS 8 version:
sudo yum install -y epel-release
Step 4: Install the CentOS 8 Release Package
Download and install the CentOS 8 release package:
sudo yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm sudo yum install -y https://repo.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-linux-repos-8-3.el8.noarch.rpm sudo yum install -y https://repo.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-linux-release-8.5-11.el8.noarch.rpm sudo yum install -y https://repo.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-gpg-keys-8-3.el8.noarch.rpm
Step 5: Perform the Upgrade
Now, you’re ready to upgrade your system. First, remove the CentOS 7 release package:
sudo rpm -e --nodeps centos-release
Next, upgrade your system to CentOS 8:
sudo yum upgrade -y
Step 6: Reboot Your System
After the upgrade process completes, reboot your system to apply the changes and load CentOS 8:
Step 7: Verify the Upgrade
Once your system has rebooted, check if the upgrade was successful:
If the output shows “CentOS Linux release 8.x”, your system has been successfully upgraded.
- rsync – Synchronize files and directories between two locations
- tar – Create and extract archive files
- yum update – Update installed packages to the latest versions
- yum upgrade – Upgrade installed packages, including kernel, with smart conflict resolution
- yum install – Install specified packages and their dependencies
- rpm – Manage RPM packages
- reboot – Restart the system
- cat – Display the contents of a file
Following this guide should have helped you successfully upgrade your CentOS 7 system to CentOS 8. Always remember to create backups before performing significant system upgrades and verify the successful completion of the upgrade process.
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