centos7 npm安装 centos7安装ntp服务

CentOS7安装配置NTP服务

NTP服务是时间同步服务

1. 安装NTPd
[root@centos7 ~]# yum install -y ntp
[jack@centos7 ~]$ vi /etc/ntp.conf
添加如下的代码
restrict 192.168.0.0 mask 255.255.0.0 nomodify notrap
更改时间同步服务器
#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
server ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst
server ntp3.jst.mfeed.ad.jp iburst
[root@centos7 ~]# systemctl start ntpd
[root@centos7 ~]# systemctl enable ntpd
2. 设置防火墙，允许NTP服务使用123/UDP
[root@centos7 ~]# firewall-cmd --add-service=ntp –permanent
[root@centos7 ~]# firewall-cmd –reload
3. 验证
[root@centos7 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*leontp.ccgs.wa. .GPS. 1 u 2 64 15 443.939 -3.250 4.178
+120.25.115.19 10.137.38.86 2 u 62 64 17 49.708 9.697 6.603
+ntp-sz.chl.la 202.118.1.46 2 u 59 64 17 41.490 13.642 5.630
-202.118.176.2 202.118.177.155 4 u 34 64 37 54.802 27.184 4.129

基于【CentOS-7+ Ambari 2.7.0 + HDP 3.0】搭建HAWQ数据仓库——安装配置NTP服务，保证集群时间保持同步