CentOS 6.6 release notes and upgrade steps from 6.x to 6.6

CentOS community announced the new release of CentOS 6.6 on 28 October, 2014. In this release lot of bug has been fixed and also some major changes with some deprecated features has been done.

What’s New in CentOS 6.6

  • OpenvSwitch module is now available as a kernel module.
  • New HyperV daemons have been added to enable/improve running CentOS in Microsoft HyperV hosts.
  • Haproxy are now fully supported.
  • Support added for the Intel Wildcat platform.
  • OpenJDK 8 has been added as technology preview.
  • Lot of Features Deprecated and will be remove in future releases
  • Lot of package modified
  • Lot of package removed
  • For complete change log

Note :1) Take a backup of your important data (web content, mysql database, all service configuration settings) before upgrading, If anything goes wrong we can reinstall freshly and restore the data.
2) The upgrade will take 10-20 mins based on your Internet connection and list of package which you install.

1) Checking current version of my server

Use the below command to check which version of CentOS server currently running.

[email protected] [~]# cat /etc/redhat-release
CentOS release 6.5 (Final)

2) Upgrading CentOS from 6.x to 6.6

Use the below command to upgrade your system to latest version.

# Removing cached packages and headers #
[email protected] [~]# yum clean all

# Upgrading the system #
[email protected] [~]# yum -y upgrade
Transaction Summary
Install       2 Package(s)
Upgrade     227 Package(s)

Total download size: 193 M
Is this ok [y/N]: y
Downloading Packages:

# Reboot your system #
[email protected] [~]# reboot

3) Checking Upgraded version of my server

Use the below command to check whether the CentOS version upgraded.

[email protected] [~]# cat /etc/redhat-release
CentOS release 6.6 (Final)

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About Prakash Subramanian

Prakash Subramanian is a Linux lover and has 3.5+ years of experience in linux server administration with major Linux distribution such as (RHEL, CentOS, Ubuntu). He is currently working as a Senior L2 Linux Server administrator.

View all posts by Prakash Subramanian

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