As a software tester or developer you are using operating systems such as RHEL, CentOS and Fedora. It may happen that the hard disk space is running at the limit and a further update is no longer possible. An easy way to create free space is to delete the kernel(s) of older versions.
# check for all (old) kernels $ rpm -q kernel
By default 5 kernels will be stored.
# change configuration $ vim yum.conf # limit value and save installonly_limit=2 # update $ yum -y update
Delete unused (old) kernels
# install yum-utils $ yum install yum-utils # cleanup with value for old kernels you want left $ package-cleanup --oldkernels --count=2