linux在局域网下设置时间同步

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第一步：

选择一个服务器作为时间同步服务器，如IC-1(IP:192.168.1.101)

在IC-1中，编辑文件/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 noqueryrestrict -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 127.0.0.1restrict -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 (http://www.pool.ntp.org/join.html).#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 iburstserver 127.127.1.0fudge 127.127.1.0 stratum 10#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.#cryptoincludefile /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

如上配置，其中

server 127.127.1.0fudge 127.127.1.0 stratum 10

是新加的配置，这是让本机的ntpd和本地硬件时间同步。

#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

为注释掉的配置信息。

第二步，启动服务：

/etc/init.d/ntpd start

第三步，在其他节点，开启定时任务，同步时间即可

crontab -e

01 * * * * ntpdate 192.168.1.101

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