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