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Yum remove old kernels (CentOS)

Paolo Caparrelli Linux 22 June 2022

1. Check Installed Kernels

rpm -q kernel
kernel-2.6.32-279.el6.x86_64
kernel-2.6.32-279.2.1.el6.x86_64
kernel-2.6.32-279.5.2.el6.x86_64
kernel-2.6.32-279.9.1.el6.x86_64

2. Delete / Remove Old Kernels

## Install yum-utils ##
## Fedora 25/24/23/22 ##
dnf install yum-utils

## Fedora 21/20/19/18/17/16, CentOS, Red Hat (RHEL) ##
yum install yum-utils

## Package-cleanup set count as how many old kernels you want left ##
package-cleanup –oldkernels –count=2

3. Make Amount of Installed Kernels Permanent
Edit /etc/yum.conf or /etc/dnf/dnf.conf and set installonly_limit:

installonly_limit=2

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