阿里云服务器bug修改方案
RHSA-2016:2674: libgcrypt security update (Moderate)：yum update libgcrypt
RHSA-2017:1372: kernel security and bug fix update (Moderate)：yum update kernel
yum update kernel-devel
yum update kernel-firmware
yum update kernel-headers
glibc security update (Important)：
yum update glibc
yum update glibc-common
yum update glibc-devel
yum update glibc-headers
RHSA-2017:0641: openssh security and bug fix update (Moderate)：
yum update openssh
yum update openssh-clients
yum update openssh-server
RHSA-2017:0286: openssl security update (Moderate)：
yum update openssl
yum update openssl-devel
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-2016:2972: vim security update (Moderate)：
yum update vim-filesystem
yum update vim-minimal
