NTP时间服务器，部署NTP时间同步服务器
检查集群服务器的Linux版别，确保相同
[root@cdh1 ~]# cat /etc/redhat-releaseCentOS Linux release 7.2.1511 (Core)
检查服务器是否装置ntp服务（集群的每个节点）
[root@cdh1 ~]# rpm -qa | grep ntpfontpackages-filesystem-1.44-8.el7.noarchntpdate-4.2.6p5-29.el7.centos.x86_64ntp-4.2.6p5-29.el7.centos.x86_64
如果没有装置运用以下命令装置（集群每个节点）
[root@cdh1 ~]# yum install ntp ntpdate -y
检查NTP服务的状况（集群每个节点）
[root@cdh1 ~]# systemctl status ntpd.service● ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled; vendor preset: disabled) Active: inactive (dead)
修正NTP服务器的机器的装备文件，我的是cdh1机器是服务器
[root@cdh1 ~]# vi /etc/ntp.conf#找到如下内容注释掉# Please consider joining the pool (http://www.pool.ntp.org/join.html).server 0.centos.pool.ntp.org iburstserver 1.centos.pool.ntp.org iburstserver 2.centos.pool.ntp.org iburstserver 3.centos.pool.ntp.org iburst#添加以下内容，同步本地时刻server 127.127.1.0 iburst
发动cdh1节点的NTP服务
[root@cdh1 ~]# systemctl start ntpd.service
设置cdh1节点NTP开机发动
[root@cdh1 ~]# systemctl enable ntpd.service
在cdh1检查NTP状况
[root@cdh1 ~]# systemctl status ntpd.service● ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled) Active: active (running) since Sat 2019-09-28 21:17:35 CST; 2min 10s ago Main PID: 72322 (ntpd) CGroup: /system.slice/ntpd.service └─72322 /usr/sbin/ntpd -u ntp:ntp -g Sep 28 21:17:35 cdh1 ntpd[72322]: Listen normally on 2 lo 127.0.0.1 UDP 123Sep 28 21:17:35 cdh1 ntpd[72322]: Listen normally on 3 eno16777736 192.168.20.134 UDP 123Sep 28 21:17:35 cdh1 ntpd[72322]: Listen normally on 4 lo ::1 UDP 123Sep 28 21:17:35 cdh1 ntpd[72322]: Listen normally on 5 eno16777736 fe80::20c:29ff:fe45:70d1 UDP 123Sep 28 21:17:35 cdh1 ntpd[72322]: Listening on routing socket on fd #22 for interface updatesSep 28 21:17:35 cdh1 ntpd[72322]: 0.0.0.0 c016 06 restartSep 28 21:17:35 cdh1 ntpd[72322]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPMSep 28 21:17:35 cdh1 ntpd[72322]: 0.0.0.0 c011 01 freq_not_setSep 28 21:17:35 cdh1 systemd[1]: Started Network Time Service.Sep 28 21:17:36 cdh1 ntpd[72322]: 0.0.0.0 c514 04 freq_mode
cdh1节点检查是否同步：关闭防火墙或者开放123端口
[root@cdh1 ~]# ntpq -p remote refid st t when poll reach delay offset jitter==============================================================================*LOCAL(0) .LOCL. 5 l 47 64 7 0.000 0.000 0.000
装备客户机的NTP服务，修正装备文件
#注释其他上游服务器#server 0.centos.pool.ntp.org iburst#server 1.centos.pool.ntp.org iburst#server 2.centos.pool.ntp.org iburst#server 3.centos.pool.ntp.org iburst #装备上游时刻服务器为本地的ntpd Server服务器server 192.168.20.134#装备允许上游时刻服务器自动修正本机的时刻restrict 192.168.20.134 nomodify notrap noquery
将客户机的时刻与服务器的同步下
[root@cdh2 ~]# ntpdate -u 192.168.20.13428 Sep 21:29:49 ntpdate[99848]: step time server 192.168.20.134 offset 18.103932 sec
发动客户端的NTP服务&装备开机发动NTP
[root@cdh2 ~]# systemctl start ntpd.service[root@cdh2 ~]# systemctl enable ntpd.service
检查客户机的NTP状况
[root@cdh2 ~]# systemctl status ntpd.service● ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled) Active: active (running) since Sat 2019-09-28 21:31:26 CST; 38s ago Main PID: 100613 (ntpd) CGroup: /system.slice/ntpd.service └─100613 /usr/sbin/ntpd -u ntp:ntp -g Sep 28 21:31:26 cdh2 ntpd[100613]: Listen and drop on 1 v6wildcard :: UDP 123Sep 28 21:31:26 cdh2 ntpd[100613]: Listen normally on 2 lo 127.0.0.1 UDP 123Sep 28 21:31:26 cdh2 ntpd[100613]: Listen normally on 3 eno16777736 192.168.20.132 UDP 123Sep 28 21:31:26 cdh2 ntpd[100613]: Listen normally on 4 lo ::1 UDP 123Sep 28 21:31:26 cdh2 ntpd[100613]: Listen normally on 5 eno16777736 fe80::20c:29ff:feb3:f5ad UDP 123Sep 28 21:31:26 cdh2 ntpd[100613]: Listening on routing socket on fd #22 for interface updatesSep 28 21:31:26 cdh2 ntpd[100613]: 0.0.0.0 c016 06 restartSep 28 21:31:26 cdh2 ntpd[100613]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPMSep 28 21:31:26 cdh2 ntpd[100613]: 0.0.0.0 c011 01 freq_not_setSep 28 21:31:26 cdh2 systemd[1]: Started Network Time Service.
检查时刻是否同步
[root@cdh2 ~]# ntpq -p remote refid st t when poll reach delay offset jitter============================================================================== cdh1 LOCAL(0) 6 u 14 64 3 1.092 9.130 3.475
