CentOS7.0 安装NTP服务器及思科交换机NTP同步

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一、安装环境:

CentOS 7 Linux version 3.10.0-229.el7.x86_64

ntp-4.2.6p5-19.el7.centos.x86_64

二、安装及配置

2.1 安装

NTP可以直接通过yum来安装,使用 rpm -qa ntp可以查看是否已安装ntp服务,如有安装可使用yum install ntp 来升级,当然也可以不用升级

命令:

yum install ntp #安装NTP服务器

2.2 配置

cat /etc/ntp.conf

# For more information about this file,see the man pages

# ntp.conf(5),ntp_acc(5),ntp_auth(5),ntp_clock(5),ntp_misc(5),ntp_mon(5).


driftfile /var/lib/ntp/drift #默认配置,无需改动


# Permit time synchronization with our time source,but do not

# permit the source to query or modify the service on this system.

restrict default nomodify notrap nopeer noquery #默认配置,无需改动


# Permit all access over the loopback interface. This could

# be tightened as well,but to do so would effect some of

# the administrative functions.

restrict 127.0.0.1 #默认配置,无需改动

restrict ::1 #默认配置,无需改动


# Hosts on local network are less restricted.

#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

restrict 192.168.30.0 mask 255.255.255.0 nomodify notrap #增加这一行,允许哪些IP 地址可以同步NTP服务器,也可以不用配置,默认所有网段


# Use public servers from the pool.ntp.org project.

# Please consider joining the pool (http://www.pool.ntp.org/join.html).

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

#默认配置,可以不用改动,在中国大陆会默认使用大陆的主NTP服务器,在香港就会使用香港的NTP服务器。当然也可以注释上面四行,自己添加,如 server 0.210.72.145.44

#broadcast 192.168.1.255 autokey# broadcast server

#broadcastclient# broadcast client

#broadcast 224.0.1.1 autokey# multicast server

#multicastclient 224.0.1.1# multicast client

#manycastserver 239.255.254.254# manycast server

#manycastclient 239.255.254.254 autokey # manycast client


# Enable public key cryptography.

#crypto


includefile /etc/ntp/crypto/pw #默认配置,无需改动


# Key file containing the keys and key identifiers used when operating

# with symmetric key cryptography.

keys /etc/ntp/keys #默认配置,无需改动


# Specify the key identifiers which are trusted.

#trustedkey 4 8 42


# Specify the key identifier to use with the ntpdc utility.

#requestkey 8


# Specify the key identifier to use with the ntpq utility.

#controlkey 8


# Enable writing of statistics records.

#statistics clockstats cryptostats loopstats peerstats


# Disable the monitoring facility to prevent amplification attacks using ntpdc

# monlist command when default restrict does not include the noquery flag. See

# CVE-2013-5211 for more details.

# Note: Monitoring will not be disabled with the limited restriction flag.

disable monitor #默认配置,无需改动

2.3 启动NTP服务

命令:

systemctl start ntpd.service 开启服务

systemctl stop ntpd.service 停止服务

三、测试

命令:

ntpstat #查看ntp服务器是否连通,启动服务后需要三五分钟后才会连通

ntpq -p #查看ntp服务器连接状态

netstat -tunlp | grep ntpd #查看服务端口

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在另一台linux上测试ntp同步是否可用

命令:

yum install ntpdate

ntpdate 172.31.251.196

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四、交换机同步

配置命令:

conf t

ntp server 172.31.251.196

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