General Information

YellowDog Update Manager (yum) .

Checklist

• Enterprise Linux (Red Hat based)

View Installed Kernels

rpm -q kernel

Remove Old Kernels

1. Install yum utils

   yum install yum-utils

2. Cleanup, set count to how many old kernels you want to remain

   package-cleanup --oldkernels --count=3

3. Set number of installed kernels as a persistent setting

   vim /etc/yum.conf
    
   installonly_limit=3

Lock packages at specific versions to prevent them from being upgraded with “yum update”.

Install the version lock yum plugin

yum install yum-plugin-versionlock

Lock httpd package at the current installed version

yum versionlock httpd

List version locked entries

yum versionlock list

Remove httpd from being version locked

yum versionlock delete httpd

Remove all packages from being version locked

yum versionlock clear

TODO