第一个问题：
RHSA-2016:2766: kernel security and bug fix update (Important)
yum update kernel-devel

RHSA-2017:0307: kernel security and bug fix update (Moderate)


DJ系统补丁    
RHSA-2017:1100: nss and nss-util security update (Critical)
yum update nss-util
yum update nss
yum update nss-sysinit
yum update nss-tools

RHSA-2017:1095: bind security update (Important)
yum update bind-libs-lite
yum update bind-license

RHSA-2017:1615: kernel security and bug fix update (Important)
yum update kernel
yum update kernel-devel
yum update kernel-headers
yum update kernel-tools
yum update kernel-tools-libs
yum update python-perf

RHSA-2016:2615: bind security update (Important)
yum update bind-libs-lite
yum update bind-license

RHSA-2017:1680: bind security and bug fix update (Important)
yum update bind-libs-lite
yum update bind-license

RHSA-2017:0062: bind security update (Important)
yum update bind-libs-lite
yum update bind-license

RHSA-2017:1308: kernel security, bug fix, and enhancement update (Important)
yum update kernel-tools
yum update kernel-tools-libs
yum update python-perf