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
升级系统内核：yum -y upgrade
升级所有包，改变软件设置和系统设置,系统版本内核都升级：yum -y update
升级所有包，不改变软件设置和系统设置，系统版本升级，内核不改变:yum -y upgrade