The path to a valid CentOS mirror should include the CentOS version and the architecture, eg.: (more…)

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fdisk also reports “Re-reading the partition table failed with error 16” on write. The reason is unknown but you can run:

$ partprobe

to update the devices.

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The only tool which can permanently change the hostname is:

$ hostnamectl set-hostname <name>

Found at IT’s Geek.

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Install the deltarpm plugin with:

$ yum install deltarpm

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One thing to do is to remove old kernels:

Do the following to keep just the last 2 kernels on your system, to keep /boot clean:

1. 1. Edit /etc/yum.conf and set the following parameter

      installonly_limit=2
      

      This will make your package manager keep just the 2 last kernels on your system (including the one that is running)

   2. Install yum-utils:

      yum install yum-utils
      

   3. Make an oldkernel cleanup:

      package-cleanup --oldkernels --count=2
      

      This will erase in a good fashion the old kernels, and, keep just the last 2 of them for the next upgrades.

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