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Found at: raymii.org:70/Remove_Old_CentOS_RHEL_Kernels.txt

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Title       : 	Remove unused CentOS/Red Hat kernels
Author      : 	Remy van Elst
Date        : 	18-01-2014
URL         : 	https://raymii.org/s/snippets/Remove_Old_CentOS_RHEL_Kernels.html
Format      : 	Markdown/HTML
This small article will show you how to remove unused kernels in Red Hat or
CentOS. This is sometimes necessary because the /boot partition can fill up.
[Are you running Ubuntu and want to clean up kernels? See this article:
https://raymii.org/s/snippets/Remove _Old_ Ubuntu_Kernels.html][1]

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You can check which kernels you have installed using the `rpm -q kernel`
    $ rpm -q kernel
As you can see this is a CentOS 5 box.
In the `yum-utils` package there is the `package-cleanup` command. This command,
among other things, lets you remove older kernels very simple. First install it:
    yum install yum-utils
With the following command you can clean up all old kernels and keep just two.
The current one and the previous one:
    package-cleanup --oldkernels --count=2
The Fedora Documentation has more info and various good examples on the
`package-cleanup` command: [https://docs.fedoraproject.org/en-
US/Fedora/14/html/Software _Management_ Guide/ch07s03.html][3]
   [1]: https://raymii.org/s/snippets/Remove_Old_Ubuntu_Kernels.html
   [2]: https://www.digitalocean.com/?refcode=7435ae6b8212
   [3]: https://docs.fedoraproject.org/en-US/Fedora/14/html/Software_Management_Guide/ch07s03.html
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