How to Update or Upgrade CentOS 7.1, 7.2, 7.3, 7.4, 7.5, or 7.6 to CentOS 7.7

Description

Instructions for updating or upgrading to CentOS 7.7 from previous versions 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, or 7.6.

CentOS is a Linux distribution that offers users a free and community-supported computing platform that is functionally compatible with Red Hat Enterprise Linux, the distribution that serves as its upstream source.

Check Current OS Version

# cat /etc/redhat-release
or
# cat /etc/os-release

NOTE: Ensure that a backup is created for each of the applications and services.

If this is a production server and you are running your applications and services on it, then please make sure to take a complete backup at least once before beginning the update. This way, in the event that your applications are unable to support the updated packages, you will have a backup to fall back on.

Check for Updates

# sudo yum check-update

Clean up yum package manager

The local listings and metadata of previously installed packages are stored in the yum packager manager database. It is necessary to run the clean up process at least once in order to clear out all of the previously cached data.

# sudo yum clean all

After Clean Up, reboot the server.

A single restart of the server is required in order to clear out the local cache and repository. The process will move along more quickly as a result, and any unnecessary complications will be avoided.

# reboot

Upgrade CentOS to the most recent version available.

# sudo yum upgrade

Then you must perform a single reboot.

# sudo reboot

Check to See What Version CentOS Is Running

# cat /etc/redhat-release

CentOS is a Linux distribution that provides users with a free and community-supported computing platform that functions in the same manner as its upstream source, Red Hat Enterprise Linux.

Must Read : 4 Effective Ways to Determine the Name of a Plugged USB Device in Linux

Thankyou.