Centos集群ntp时间同步

在集群中,各个主机时钟存在略微差异,会导致时差越来越大,这就需要同步时间机制保持主机时间在合理的范围内,ntp就是为此而设计的

  • 首先安装ntp
yum install -y ntp
  • 编辑ntp配置
vim /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 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 ::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 (http://www.pool.ntp.org/join.html).
server cn.ntp.org.cn iburst
server 120.25.108.11 iburst
server 202.108.6.95 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

# 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

将server地址替换为目的主机较近的节点

  • 启动ntp服务
systemctl start ntpd
  • 设置开机自起
systemctl enable ntpd
  • 查看监控状态
ntpq -p
  • 查看状态
ntpstat
  • 修改其他机器同步时间
echo "*/1 * * * * root /usr/sbin/ntpdate 192.168.12.175; /sbin/hwclock -w" >> /etc/crontab
service crond restart
  • 查看定时任务日志
tail -f  /var/log/cron

完成!

VinkDong

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