Technical Tip: Clean up /boot in CentOS, RHEL or Rocky Linux 8 and up

asvraka · ‎05-23-2023

Description

This article describes how to clean up the /boot directory in CentOS, RHEL or Rocky Linux 8 and up

Scope

FortiSOAR with CentOS, RHEL, Rocky Linux 8+.

Solution

To free space in /boot while upgrading the FortiSOAR™ system running on Rocky Linux 8 or up, follow these steps:

1) Check the current kernel being used:

sudo uname -sr

2) List all kernels installed on the system:

sudo rpm -q kernel

3) Delete old kernels and only leave <X> number of kernels:

sudo dnf remove --oldinstallonly --setopt installonly_limit=<X> kernel

Note: <X> can be set to 1, 2, 3 or other numeric values. Carefully check the running kernel in step 2 and any other kernels used before running this command. Alternatively, use the following command to delete kernels one by one:

rpm -e <kernel_name>

Kernel names can be obtained through step 2.