To check kernel release on centos/RHEL and Fedora
[huupv@huupv ~]$ uname -srThe output kernel release as below:
Linux 4.15.15-300.fc27.x86_64
Checking installed kernel
[huupv@huupv ~]$ rpm -q kernelThe output three kernel as below:
kernel-4.15.13-300.fc27.x86_64
kernel-4.15.14-300.fc27.x86_64
kernel-4.15.15-300.fc27.x86_64
Delete / Remove Old Kernels
To install yum-utils[root@huupv huupv]# yum install yum-utilsThe output as below:
Last metadata expiration check: 2:54:35 ago on Sat 14 Apr 2018 07:14:37 PM +07.How many old kernels you want left
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
yum-utils noarch 1.1.31-513.fc27 fedora 117 k
Installing dependencies:
python-urlgrabber noarch 3.10.1-12.fc27 fedora 111 k
python2-pycurl x86_64 7.43.0-9.fc27 fedora 247 k
pyxattr x86_64 0.5.3-12.fc27 fedora 34 k
yum noarch 3.4.3-513.fc27 fedora 1.2 M
yum-metadata-parser x86_64 1.1.4-20.fc27 fedora 39 k
Transaction Summary
================================================================================
Install 6 Packages
Total download size: 1.8 M
Installed size: 7.4 M
Is this ok [y/N]: y
Downloading Packages:
(1/6): python-urlgrabber-3.10.1-12.fc27.noarch. 201 kB/s | 111 kB 00:00
(2/6): yum-utils-1.1.31-513.fc27.noarch.rpm 203 kB/s | 117 kB 00:00
(3/6): pyxattr-0.5.3-12.fc27.x86_64.rpm 427 kB/s | 34 kB 00:00
(4/6): yum-metadata-parser-1.1.4-20.fc27.x86_64 375 kB/s | 39 kB 00:00
(5/6): python2-pycurl-7.43.0-9.fc27.x86_64.rpm 934 kB/s | 247 kB 00:00
(6/6): yum-3.4.3-513.fc27.noarch.rpm 1.1 MB/s | 1.2 MB 00:01
--------------------------------------------------------------------------------
Total 868 kB/s | 1.8 MB 00:02
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : python2-pycurl-7.43.0-9.fc27.x86_64 1/6
Installing : python-urlgrabber-3.10.1-12.fc27.noarch 2/6
Installing : yum-metadata-parser-1.1.4-20.fc27.x86_64 3/6
Installing : pyxattr-0.5.3-12.fc27.x86_64 4/6
Installing : yum-3.4.3-513.fc27.noarch 5/6
Running scriptlet: yum-3.4.3-513.fc27.noarch 5/6
Installing : yum-utils-1.1.31-513.fc27.noarch 6/6
Running scriptlet: yum-utils-1.1.31-513.fc27.noarch 6/6
Running as unit: run-r93b673459ba7488f95be27fd4a5c28f3.service
Verifying : yum-utils-1.1.31-513.fc27.noarch 1/6
Verifying : yum-3.4.3-513.fc27.noarch 2/6
Verifying : python-urlgrabber-3.10.1-12.fc27.noarch 3/6
Verifying : pyxattr-0.5.3-12.fc27.x86_64 4/6
Verifying : yum-metadata-parser-1.1.4-20.fc27.x86_64 5/6
Verifying : python2-pycurl-7.43.0-9.fc27.x86_64 6/6
Installed:
yum-utils.noarch 1.1.31-513.fc27 python-urlgrabber.noarch 3.10.1-12.fc27
python2-pycurl.x86_64 7.43.0-9.fc27 pyxattr.x86_64 0.5.3-12.fc27
yum.noarch 3.4.3-513.fc27 yum-metadata-parser.x86_64 1.1.4-20.fc27
Complete!
[root@huupv huupv]# package-cleanup --oldkernels --count=2The output as below:
Yum-utils package has been deprecated, use dnf instead.
See 'man yum2dnf' for more information.
--> Running transaction check
---> Package kernel.x86_64 0:4.15.13-300.fc27 will be erased
---> Package kernel-core.x86_64 0:4.15.13-300.fc27 will be erased
--> Processing Dependency: kernel-uname-r = 4.15.13-300.fc27.x86_64 for package: kernel-modules-4.15.13-300.fc27.x86_64
--> Processing Dependency: kernel-uname-r = 4.15.13-300.fc27.x86_64 for package: kernel-modules-extra-4.15.13-300.fc27.x86_64
---> Package kernel-devel.x86_64 0:4.15.13-300.fc27 will be erased
--> Running transaction check
---> Package kernel-modules.x86_64 0:4.15.13-300.fc27 will be erased
---> Package kernel-modules-extra.x86_64 0:4.15.13-300.fc27 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Removing:
kernel x86_64 4.15.13-300.fc27 installed 0.0
kernel-core x86_64 4.15.13-300.fc27 installed 58 M
kernel-devel x86_64 4.15.13-300.fc27 installed 48 M
Removing for dependencies:
kernel-modules x86_64 4.15.13-300.fc27 installed 26 M
kernel-modules-extra x86_64 4.15.13-300.fc27 installed 2.1 M
Transaction Summary
================================================================================
Remove 3 Packages (+2 Dependent packages)
Installed size: 134 M
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
Erasing : kernel-4.15.13-300.fc27.x86_64 1/5
Erasing : kernel-modules-extra-4.15.13-300.fc27.x86_64 2/5
Erasing : kernel-devel-4.15.13-300.fc27.x86_64 3/5
Erasing : kernel-modules-4.15.13-300.fc27.x86_64 4/5
Erasing : kernel-core-4.15.13-300.fc27.x86_64 5/5
warning: file /lib/modules/4.15.13-300.fc27.x86_64/updates: remove failed: No such file or directory
Verifying : kernel-core-4.15.13-300.fc27.x86_64 1/5
Verifying : kernel-4.15.13-300.fc27.x86_64 2/5
Verifying : kernel-modules-extra-4.15.13-300.fc27.x86_64 3/5
Verifying : kernel-modules-4.15.13-300.fc27.x86_64 4/5
Verifying : kernel-devel-4.15.13-300.fc27.x86_64 5/5
Removed:
kernel.x86_64 0:4.15.13-300.fc27 kernel-core.x86_64 0:4.15.13-300.fc27
kernel-devel.x86_64 0:4.15.13-300.fc27
Dependency Removed:
kernel-modules.x86_64 0:4.15.13-300.fc27
kernel-modules-extra.x86_64 0:4.15.13-300.fc27
Complete!
Fedora 31
# dnf remove $(dnf repoquery --installonly --latest-limit=-2 -q)
Another method, to remove old kernels in CentOS, RHEL and Fedora set installonly_limit in /etc/yum.conf file. and next time update!
[root@huupv huupv]# cat /etc/yum.conf | grep installonly_limit=2The output as below:
installonly_limit=2The result, to keep two kernel as below:
Conclusion
Thought the aricle, you have removed old kernel. If you have any question then comment below:Thanks for reading Remove old kernels in CentOS, RHEL and Fedora My blog Effortless Zimbra Mail Management: Unleashing the Power of Linux Commands, How-To, and Bash Scripts I hope this is useful.
