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  • Cloudera Manager安装之时间服务器和时间客户端(二)

    前期博客

    Cloudera Manager安装之Cloudera Manager安装前准备(CentOS6.5)(一)

    带大家手把手读cloudera官网

     https://www.cloudera.com/documentation/enterprise/5-3-x.html

       说明:这些是可以点击进入,就直接可以下载得到电子档了。我这里不多赘述。

      (1) 找一台机器作为时间服务器

      我这里,放到clouderaManager01这台机器!

      注意,之前是已经做了集群时间同步了。

    [hadoop@clouderaManager01 ~]$ sudo rpm -qa|grep ntp
    fontpackages-filesystem-1.41-1.1.el6.noarch
    ntp-4.2.6p5-10.el6.centos.2.x86_64
    ntpdate-4.2.6p5-10.el6.centos.2.x86_64
    [hadoop@clouderaManager01 ~]$ sudo vim /etc/ntp.conf 

      默认是如下

    复制代码
    # 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 (http://www.pool.ntp.org/join.html).
    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
    
    #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
    复制代码

       注意,这里有2处地方需要我们进行修改,如下

       因为,

       所以,修改地方1:

    restrict 192.168.80.0 mask 255.255.255.0 nomodify notrap

       所以,修改地方2:

    #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

       有些人的机器上,如果有,需要如下去掉注释。(我的这里是没有的)

    server 127.127.1.0    #local  clock
    fudge   127.127.1.0   stratum  10

       (2)找一台机器与,保持boss与时间同步

      我这里,放到clouderaManager01这台机器!

     

    [hadoop@clouderaManager01 ~]$ sudo vi /etc/sysconfig/ntpd

       默认是

    # Drop root to id 'ntp:ntp' by default.
    OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -g"

       

       我们,需要进行修改

    # Drop root to id 'ntp:ntp' by default.
    SYNC_HWCLOCK=yes
    OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid -g"

       只需,增加如上的一行即可。

      然后,我们需设置clouderaManager01这台机器的时间服务器,为开机就启动,方便呗!

    复制代码
    [hadoop@clouderaManager01 ~]$ sudo service ntpd status
    ntpd is stopped
    [hadoop@clouderaManager01 ~]$ sudo service ntpd start
    Starting ntpd:                                             [  OK  ]
    [hadoop@clouderaManager01 ~]$ sudo chkconfig ntpd on
    [hadoop@clouderaManager01 ~]$ sudo chkconfig --list|grep ntpd
    ntpd               0:off    1:off    2:on    3:on    4:on    5:on    6:off
    ntpdate            0:off    1:off    2:off    3:off    4:off    5:off    6:off
    [hadoop@clouderaManager01 ~]$ 
    复制代码

      (2) 找三台机器作为时间客户端

      我这里,放到clouderaManager02和clouderaManager03这三台机器!

      注意,这里使用的是Linux的定时任务,即Linux  Crontab,必须得root用户来操作啊!我这里是每10分钟同步一次!

    [root@clouderaManager02 hadoop]# pwd
    /home/hadoop
    [root@clouderaManager02 hadoop]# crontab -l
    no crontab for root
    [root@clouderaManager02 hadoop]# crontab -e

     

    ## sync cluster time
    0-59/10 * * * * /usr/sbin/ntpdate clouderamanager01

      其实啊,这里的写法很多种,我这里不多赘述,我喜欢用这种。

      第一个*是分

      第二个*是时

      第三个*是天

      第四个*是月

      clouderamanager01指的是,时间同步服务器是在哪台机器上。

      10是每10分钟一次,比如,你也设置为5,即每5分钟一次。

       

      clouderamanager03这台机器也是一样!这里不多赘述了。

     ***************************************************************

    扩展:

       若是在工作中以后,需要手动来时间同步,则分别在时间客户端(louderaManager02、clouderaManager03和clouderaManager04)上,执行

      sudo /usr/sbin/ntpdate clouderaManager01

       即可,我这里不多说。

     ***************************************************************

    接下来,我们进入,CM的安装!

    Cloudera Manager安装之Cloudera Manager 5.3.X安装(三)(tar方式、rpm方式和yum方式)

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  • 原文地址:https://www.cnblogs.com/wangsongbai/p/9116089.html
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