dotlinux blog

CentOS 6.5 Released – Upgrade from CentOS 6.x to CentOS 6.5

CentOS is a well - known and widely used Linux distribution, valued for its stability, security, and compatibility with Red Hat Enterprise Linux (RHEL). The release of CentOS 6.5 brought several improvements, bug fixes, and updated software packages. If you are currently using CentOS 6.x, upgrading to CentOS 6.5 can enhance the performance and security of your system. In this blog post, we will guide you through the process of upgrading from CentOS 6.x to CentOS 6.5 step - by - step.

2026-06

Table of Contents#

  1. Prerequisites
  2. Backing Up Your Data
  3. Updating the System Packages
  4. Upgrading to CentOS 6.5
  5. Verifying the Upgrade
  6. Post - Upgrade Steps
  7. Troubleshooting

Prerequisites#

  • Internet Connection: You need a stable internet connection to download the necessary updates and packages.
  • Root Privileges: You should have root access or be able to use the sudo command to perform system - level operations.
  • Sufficient Disk Space: Make sure you have enough free disk space on your system to accommodate the updates. A general rule of thumb is to have at least 1GB of free space.

Backing Up Your Data#

Before starting any system upgrade, it is crucial to back up your important data. An upgrade process can sometimes go wrong, and having a backup ensures that you don't lose any critical information.

  1. Identify Important Data: Determine which files and directories are essential, such as user home directories, configuration files, and databases.
  2. Choose a Backup Method:
    • External Storage: You can use an external hard drive or USB flash drive to copy your data. For example, if you want to back up your home directory, you can use the following command:
rsync -avz /home /path/to/external/storage
- **Network Storage**: If you have access to a network - attached storage (NAS) device, you can copy your data over the network.
- **Cloud Storage**: Services like Google Drive, Dropbox, or Amazon S3 can also be used for data backup. There are various tools available to sync your local data with cloud storage.

Updating the System Packages#

Before upgrading to CentOS 6.5, it is recommended to update all the existing system packages to their latest versions. This helps to avoid potential conflicts during the upgrade process.

  1. Check for Updates:
yum check-update

This command will list all the available updates for your system. 2. Update the Packages:

yum update

This command will download and install all the available updates. Depending on the number of updates and your internet speed, this process may take some time.

Upgrading to CentOS 6.5#

Once you have updated all the system packages, you can proceed with the upgrade to CentOS 6.5.

  1. Enable the CentOS 6.5 Repository: Edit the /etc/yum.repos.d/CentOS-Base.repo file. Change the $releasever variable to 6.5 in all the repository sections. You can use a text editor like vi or nano to make the changes. For example:
nano /etc/yum.repos.d/CentOS-Base.repo

Replace all occurrences of $releasever with 6.5. 2. Clean the Yum Cache:

yum clean all

This command will remove all the cached packages and metadata. 3. Perform the Upgrade:

yum update

This command will now upgrade your system to CentOS 6.5. You will be prompted to confirm the installation of new packages and the removal of old ones. Type y and press Enter to proceed.

Verifying the Upgrade#

After the upgrade process is complete, you should verify that your system has been successfully upgraded to CentOS 6.5.

  1. Check the Release Version:
cat /etc/redhat-release

This command should display CentOS release 6.5 (Final). 2. Check the Kernel Version:

uname -r

Make sure the kernel version is compatible with CentOS 6.5.

Post - Upgrade Steps#

  • Reboot Your System:
reboot

This will ensure that all the new kernel and system settings take effect.

  • Update Third - Party Software: If you have any third - party software installed on your system, make sure to check for updates and upgrade them accordingly.
  • Check System Services: Verify that all the essential system services, such as httpd (if you are running a web server), mysql (if you are using a database), etc., are running correctly. You can use commands like service httpd status to check the status of a service.

Troubleshooting#

  • Package Conflicts: If you encounter package conflicts during the upgrade process, you can try to resolve them by using the yum --skip-broken option. For example:
yum update --skip-broken
  • Network Issues: If you are facing network issues after the upgrade, check your network configuration files, such as /etc/sysconfig/network-scripts/ifcfg-eth0. Make sure the IP address, subnet mask, and gateway settings are correct.
  • Kernel Panic: In case of a kernel panic, you may need to boot into a previous kernel version. You can select a previous kernel from the GRUB boot menu during the boot process.

Reference#

This blog post provides a comprehensive guide on upgrading from CentOS 6.x to CentOS 6.5. By following these steps, you can ensure a smooth and successful upgrade process.