Hadoop集群搭建中时间同步步骤

# 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 192.168.181.0 mask 255.255.255.0 nomodify notrap  #这里新增内容，更改为自己的网关，我的是181.第一处新增，意思是从IP　　　　                                                                                                                                    #地址192.168.181.1-192.168.181.254，默认网关255.255.255.0的服务器　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　                                                                                                                                    #都可以使用我们的NTP服务器来同步时间 # 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　　　　　　　　　　　　　　　　　#如果集群是在一个封闭的局域网内，可以屏蔽掉默认的server这里注释掉 #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst server 210.72.145.44 perfer #中国国家受时中心 server 202.112.10.36 #1.cn.pool.ntp.org server 59.124.196.83　　　　　　　　　　　　　　　　　　　　　　　　　　#这里可有可无，制定ntp服务器的同步时间范围　　　　　　　　 server 192.168.217.130 #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
server 127.127.1.0                                    #当服务器与公网失去连接后使用本地时间作为服务的同步时间          
fudge 127.127.1.0 stratum 10