1. 配置NTP
不区分发行版，先备份 /etc/ntp.conf，然后将其内容替换为如下:
# ntp.conf # # ntpd config for aliyun ecs. # # 6LAN+6LAN+3WAN # shijun.cao@alibaba-inc.com # 2014.8.11 # driftfile /var/lib/ntp/drift pidfile /var/run/ntpd.pid logfile /var/log/ntp.log # Access Control Support restrict default ignore restrict -6 default ignore restrict 127.0.0.1 restrict 192.168.0.0 mask 255.255.0.0 nomodify notrap nopeer noquery restrict 172.16.0.0 mask 255.240.0.0 nomodify notrap nopeer noquery restrict 100.64.0.0 mask 255.192.0.0 nomodify notrap nopeer noquery restrict 10.0.0.0 mask 255.0.0.0 nomodify notrap nopeer noquery restrict ntp1.aliyun.com nomodify notrap nopeer noquery restrict ntp2.aliyun.com nomodify notrap nopeer noquery restrict ntp3.aliyun.com nomodify notrap nopeer noquery restrict ntp4.aliyun.com nomodify notrap nopeer noquery restrict ntp5.aliyun.com nomodify notrap nopeer noquery restrict ntp6.aliyun.com nomodify notrap nopeer noquery # local clock server 127.127.1.0 fudge 127.127.1.0 stratum 10 #public ntp server server ntp1.aliyun.com iburst minpoll 4 maxpoll 10 server ntp2.aliyun.com iburst minpoll 4 maxpoll 10 server ntp3.aliyun.com iburst minpoll 4 maxpoll 10 server ntp4.aliyun.com iburst minpoll 4 maxpoll 10 server ntp5.aliyun.com iburst minpoll 4 maxpoll 10 server ntp6.aliyun.com iburst minpoll 4 maxpoll 10 #Private ntp server server ntp1.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp2.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp3.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp4.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp5.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp6.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 #New private ntp server server ntp7.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp8.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp9.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp10.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp11.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp12.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10
2. 更新软件源
0 . 先确认镜像当前的 Linux 系统发行版和版本号。
如果有 lsb_release 命令，执行：
lsb_release -a
否则执行
cat /etc/issue
1 . 对于 CentOS，备份 /etc/yum.repos.d/ 下的 CentOS-Base.repo 和 epel.repo 文件，根据 CentOS 版本，执行如下相应的命令:
CentOS 5:
wget -qO /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo CentOS 6: wget -qO /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo CentOS 7: wget -qO /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
repo 文件下载完成后，执行：
yum makecache
2 . 对于 Aliyun 5.7，备份 /etc/yum.repos.d/CentOS-Base.repo ，然后执行:
wget -qO /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/aliyun-5.repo
repo 文件下载完成后，执行：
yum makecache
3 . 对于 Ubuntu，备份 /etc/apt/sources.list 文件，根据发行版版本，执行命令:
ubuntu12.04: wget -qO /etc/apt/sources.list http://mirrors.aliyun.com/repo/ubuntu1204-lts.list ubuntu14.04: wget -qO /etc/apt/sources.list http://mirrors.aliyun.com/repo/ubuntu1404-lts.list
然后执行：
apt-get update
4 . 对于 Debian，备份 /etc/apt/sources.list 文件，根据发行版版本，执行命令:
debian6: wget -qO /etc/apt/sources.list http://mirrors.aliyun.com/repo/debian6-lts.list debian7: wget -qO /etc/apt/sources.list http://mirrors.aliyun.com/repo/debian7-lts.list
然后执行：
apt-get update
3. 安全漏洞修复补丁
主要修复目前已知的重大安全漏洞，需要升级的软件包括： bash 、glibc 、 openssl 、wget 、ntp 。
在执行如下命令之前，需要确保系统当前的软件源已经设置正确。
1 . 对于 CentOS 和 Aliyun Linux，执行：
yum update bash glibc openssl wget ntp
2 . 对于 Ubuntu 和 Debian，执行：
apt-get install bash libc6 libc-bin openssl wget ntp
