Linux 集群时间同步(Ubuntu)

吃颗糖果 發表於 2020-7-18 14:31:00

在配置hadoop集群时，时间同步是必须要做的，否则会出现各种意想不到的问题。
hadoop102 为 ntp server，hadoop103以及hadoop104 为ntp client（即需要同步时间机器）
1.全部机器都要安装ntp以及ntpdate
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<pre>sudo apt-get install ntp</pre>
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<div class="cnblogs_code">
<pre>sudo apt-get install ntpdate</pre>
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2.关闭所有的机器的ntp,每个机器执行命令一下命令
<div class="cnblogs_code">
<pre>sudo service ntp stop </pre>
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查看ntp状态
<div class="cnblogs_code">
<pre>sudo service ntp status</pre>
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3.修改ntp server即hadoop102的/etc/ntp.conf文件
<div class="cnblogs_code">
<pre>sudo vim /etc/ntp.conf</pre>
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相关条文解释，参考https://www.cnblogs.com/xwdreamer/p/3448773.html
<div class="cnblogs_code">
<pre># /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Leap seconds definition provided by tzdata
leapfile /usr/share/zoneinfo/leap-seconds.list

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

# Specify one or more NTP servers.

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool 0.ubuntu.pool.ntp.org iburst
pool 1.ubuntu.pool.ntp.org iburst
pool 2.ubuntu.pool.ntp.org iburst
pool 3.ubuntu.pool.ntp.org iburst

# Use Ubuntu's ntp server as a fallback.
pool ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Needed for adding pool entries
restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient</pre>
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改为如下后保存：
<div class="cnblogs_code">
<pre># /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Leap seconds definition provided by tzdata
leapfile /usr/share/zoneinfo/leap-seconds.list

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable </pre>
<pre># Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
#pool 0.ubuntu.pool.ntp.org iburst
#pool 1.ubuntu.pool.ntp.org iburst
#pool 2.ubuntu.pool.ntp.org iburst
#pool 3.ubuntu.pool.ntp.org iburst

# Use Ubuntu's ntp server as a fallback.
#pool ntp.ubuntu.com
server 127.127.1.0
fudge 127.127.1.0 stratum 10

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Needed for adding pool entries
restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
restrict 192.168.123.0 mask 255.255.255.0 nomodify notrap

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255</pre>
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4.对ntp server （hadoop102）执行命令，开启服务
<div class="cnblogs_code">
<pre>sudo service ntp start</pre>
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5.同步时间(除hadoop102的其他机器都要执行)
<div class="cnblogs_code">
<pre>sudo ntpdate hadoop102</pre>
</div>
6 在除hadoop102的其他机器，将同步时间的命令放在crontab中(切换到root用户下操作)
<div class="cnblogs_code">
<pre>*/10 * * * * /usr/sbin/ntpdate hadoop102</pre>
</div>
每十分钟更新一次
相关错误：
 no server suitable for synchronization found
http://www.blogjava.net/spray/archive/2008/07/10/213964.html
Ubuntu 时间设置
https://www.cnblogs.com/qiumingcheng/p/12210629.html
 

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本文来自博客园，作者：秋华，转载请注明原文链接：https://www.cnblogs.com/qiu-hua/p/13335686.html 
来源：https://www.cnblogs.com/qiu-hua/p/13335686.html

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Linux 集群时间同步(Ubuntu)