yum Archives

Removing the latest Kernel in CentOS

I’ve had a power cut recently, which seems to have corrupted the latest Kernel I have installed on my CentOS 6 server. I can boot into the previous one just fine, but of course if I forget to make a choice on startup, the server doesn’t start up. That’s annoying.

Thankfully there are ways to either fix the latest version, remove it, and even exclude a particular version from future updates. Here’s what worked for me on CentOS 6:

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How to remove duplicate packages with yum

I’m working on a handful of servers that all have the same problem: when running yum, an error message appears that tells me a package called ntpupdate needs to be upgraded, but somehow this doesn’t work and the package is being skipped. Then follows a huge list of duplicate packages that are installed on those systems (probably installed by the automatic package updater within Plesk).

Let’s see how we can fix such issues.

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How to fix duplicate packages in yum

From time to time, the yum package manager may encounter issues with duplicate packages that are erroneously installed on a system. This manifests in a yum update going awry, telling us something along the lines of this:

yum update
...
--> Finished Dependency Resolution
Error: Package: ntp-4.2.6p5-22.el7.centos.2.x86_64 (@updates)
           Requires: ntpdate = 4.2.6p5-22.el7.centos.2
           Removing: ntpdate-4.2.6p5-22.el7.centos.2.x86_64 (@updates)
               ntpdate = 4.2.6p5-22.el7.centos.2
           Updated By: ntpdate-4.2.6p5-25.el7.centos.x86_64 (base)
               ntpdate = 4.2.6p5-25.el7.centos
 You could try using --skip-broken to work around the problem
** Found 41 pre-existing rpmdb problem(s), 'yum check' output follows:
// huge scary list of packages follows

You may at times install all other packages via yum update –skip-broken, but it will still leave some trouble on the system. Best to take care of it.

Here’s how I’ve managed to do it on many occasions:

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How to find which package provides a command in yum

Sometimes you know you need a package, but when you try to install it with yum you’ll get a message like “No matches found”. Yet you’re sure the package exists because you’ve used it before. This can happen if the package in question is part of a set which installs multiple packages. The net-tools package … Read more

How to list installed packages on CentOS

yum can help us here. This should do the trick: #yum list installed If you’re interested in a particular package, you can pipe a search string into grep and only list filtered results: #yum list installed | grep “yum” keyutils-libs.i686 1.4-4.el6 @anaconda-CentOS-201303020136.i386/6.4 yum.noarch 3.2.29-40.el6.centos yum-metadata-parser.i686 yum-plugin-fastestmirror.noarch The search string doesn’t even need to be in … Read more