Cleaning up old kernels

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Intro

The steps below describe how to clean up old kernels.

Cleanup old kernels on CentOS 7

  • uname -r --> get active kernel version (informational)
  • yum install yum-utils --> install prerequisite (if not already installed)
  • package-cleanup --oldkernels --count=x --> remove old kernels (x = number of kernels to keep)

Cleanup old kernels on Ubuntu 16.04

  • uname -r --> get active kernel version (informational)
  • apt-get install byobu --> install prerequisite (if not already installed)
  • purge-old-kernels --> remove old kernels