NTP的配置怎么操作？
安装NTP包
检查是否安装了ntp相关包。如果安装ntp相关包，使用rpm或者yum安装，非常简单。
[root@localhost ~]# rpm -qa |grep ntp
fontpackages-filesystem-1.41-1.1.el6.noarch
ntpdate-4.2.6p5-10.el6.centos.2.i686
ntp-4.2.6p5-10.el6.centos.2.i686
NTP的配置
A.配置/etc/ntp.conf
NTP server的主要配置文件为/etc/ntp.conf，没有修改过的ntp。conf文件内同如下：
[root@localhost ~]# more /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
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
# 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
restrict -6 ::1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool ().
server 0.rhel.pool.ntp.org iburst
server 1.rhel.pool.ntp.org iburst
server 2.rhel.pool.ntp.org iburst
server 3.rhel.pool.ntp.org iburst
#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
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
# 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
1）设定NTP主机来源（其中prefer表示优先主机），192.168.66.131是本地的NTP服务器，所以优先指定从该主机同步时间
server 192.168.66.131 prefer
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
2）限制你允许的这些服务器的访问类型，在这个例子中的服务器是不容许修改运行时配置或者查询您的linux ntp服务器
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
以上的掩码地址扩展为255，因此从192.168.1.1-192.168.1.254的服务器都可以使用我们的NTP服务器来同步时间
#设置默认策略为允许任何主机进行时间同步
restrict default ignore
3)确保localhost有足够权限，使用没有任何限制关键词的语法
restrict 127.0.0.1
restrict -6 ::1
B.配置/etc/ntp/step-tickers文件
修改/etc/ntp/step-tickers文件，内容如下（当ntp服务启动时，会自动与该文件中记录的上层NTP服务进行时间校对）
[root@localhost ~]# more /etc/ntp/step-tickers
# List of servers used for initial synchronization.
server 192.168.66.131 prefer
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
以上是通过了vi修改
C.配置/etc/sysconfig/ntpd文件
ntp服务，默认智慧同步系统时间。如果让ntp同时同步硬件时间，可以设置/etc/sysconfig/ntpd文件，在/etc/sysconfig/ntpd文件中添加，SYNC_HWCLOCK=yes这样，就可以让硬件时间与系统时间一起同步。
IPTABLES配置
由于ntp服务需要使用到UDP端口号为123，所以当系统的防火墙（iptables）启动的情况下，必须开放UDP端口号123
启动NTP服务
service ntpd status
service ntpd start
netstat -lntup|grep ntp
以上就是NTP的配置怎么操作？的详细内容，更多请关注其它相关文章！
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