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Ubuntu集群 配置ntp服务

2024-07-20 19:00:17   215人阅读

1、概述

NTP（Network Time Protocol）是用来使计算机时间同步化的一种协议，它可以使计算机对其服务器或时钟源（如石英钟，GPS等等)做同步化，它可以提供高精准度的时间校正（LAN上与标准间差小于1毫秒，WAN上几十毫秒），且可介由加密确认的方式来防止恶毒的协议攻击。（来自 百度百科）

2、集群状况

现在又4台Ubuntu主机，选择其中一台作为提供ntp服务的主机（server01）。

3、安装ntp服务

在提供ntp服务的主机上安装ntpserver:

apt-get install ntp

4、配置ntp服务参数

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for helpdriftfile /var/lib/ntp/ntp.drift# Enable this if you want statistics to be logged.#statsdir /var/log/ntpstats/statistics loopstats peerstats clockstatsfilegen loopstats file loopstats type day enablefilegen peerstats file peerstats type day enablefilegen clockstats file clockstats type day enable# Specify one or more NTP servers.# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for# more information.#server 0.ubuntu.pool.ntp.org#server 1.ubuntu.pool.ntp.org#server 2.ubuntu.pool.ntp.org#server 3.ubuntu.pool.ntp.org# Use Ubuntu‘s ntp server as a fallback.#server ntp.ubuntu.comserver 127.127.1.0 minpoll 4 maxpoll 5fudge 127.127.1.0 stratum 2# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions># might also be helpful.## Note that "restrict" applies to both servers and clients, so a configuration# that might be intended to block requests from certain clients could also end# up blocking replies from your own upstream servers.# By default, exchange time with everybody, but don‘t allow configuration.restrict -4 default kod notrap nomodify nopeer noqueryrestrict -6 default kod notrap nomodify nopeer noquery# Local users may interrogate the ntp server more closely.restrict 127.0.0.1restrict ::1# Clients from this (example!) subnet have unlimited access, but only if# cryptographically authenticated.#restrict 192.168.123.0 mask 255.255.255.0 notrust...skipping one line# If you want to provide time to your local subnet, change the next line.# (Again, the address is an example only.)#broadcast 192.168.123.255# If you want to listen to time broadcasts on your local subnet, de-comment the# next lines.  Please do this only if you trust everybody on the network!#disable auth#broadcastclient

5、测试ntp服务

在提供ntp服务的服务器上运行：

ntpdate -q 127.0.0.1

得到结果：

server 127.0.0.1, stratum 3, offset -0.000018, delay 0.02568 2 Sep 16:11:07 ntpdate[5882]: adjust time server 127.0.0.1 offset -0.000018 sec

说明启动正常。

6、其它主机用它来同步时间

在需要同步时间的主机上执行：

ntpdate server01

见结果如下：

2 Sep 15:53:12 ntpdate[8420]: adjust time server 192.168.1.154 offset 0.497131 sec

server01可以是主机名也可以是ip。

7、设置定时同步时间

使用crontab：

crontab -e

设置一小时校准一次：

* */1 * * * /usr/sbin/ntpdate server01

 

Ubuntu集群 配置ntp服务


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