yum update kernel

yum update kernel-devel

yum update kernel-firmware

yum update kernel-headers

yum update nss-util

yum update nss

yum update nss-sysinit

yum update nss-tools

yum update vim-minimal

yum update openssh

yum update openssh-clients

yum update openssh-server

yum update python

yum update python-libs

升級系統內核：yum -y upgrade

升級所有包，改變軟件設置和系統設置,系統版本內核都升級：yum -y update

升級所有包，不改變軟件設置和系統設置，系統版本升級，內核不改變:yum -y upgrade