一.配置yum源：
1.Centos7系统：
执行vi /etc/yum.repos.d/CentOS-Base.repo ，将原有内容替换为如下内容：
[base] name=CentOS-$releasever - Base - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-7
[updates] name=CentOS-$releasever - Updates - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-7
[extras] name=CentOS-$releasever - Extras - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-7
[centosplus] name=CentOS-$releasever - Plus - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-7
[contrib] name=CentOS-$releasever - Contrib - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-7
wq保存文件退出。
2.Centos6系统：
执行vi /etc/yum.repos.d/CentOS-6.repo ，将原有内容替换为如下内容：
[base] name=CentOS-$releasever - Base - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-6
[updates] name=CentOS-$releasever - Updates - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-6
[extras] name=CentOS-$releasever - Extras - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-6
[centosplus] name=CentOS-$releasever - Plus - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-6
[contrib] name=CentOS-$releasever - Contrib - mirrors.jdcloudcs.com baseurl=http://mirrors.jdcloudcs.com/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://mirrors.jdcloudcs.com/centos/RPM-GPG-KEY-CentOS-6
wq保存文件退出。
3.Ubantu系统：
执行vi /etc/apt/sources.list ，将原有内容替换为如下内容：
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial main restricted
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates main restricted
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial universe
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates universe
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial multiverse
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security main restricted
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security universe
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security multiverse
wq保存文件退出。
二.配置ntpd服务：
1.调整ntpd配置文件：
执行vi /etc/ntp.conf，将原有内容替换为如下内容：
driftfile /var/lib/ntp/drift
pidfile /var/run/ntpd.pid
logfile /var/log/ntp.log
#Access Control Support
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
#local clock
server 127.127.1.0
fudge 127.127.1.0 stratum 10
#jdcloud ntp server
server ntp.jdcloudcs.com iburst minpoll 4 maxpoll 10
fudge ntp.jdcloudcs.com stratum 2
wq保存文件退出。
2.启动ntpd服务：
执行services ntpd start（Centos6系统）
执行systemctl start ntpd（Centos7系统）
执行services ntpd start（Ubantu系统）
3.设置开机自启动服务：
执行chkconfig ntpd on（Centos6系统）
执行systemctl enable ntpd（Centos7系统）
执行chkconfig ntpd on（Ubantu系统，需要先apt-get install chkconfig进行安装）