给大家带来Centos 下NTP情况的创立
如果您觉得本篇CentOSLinux教程讲得好，请记得点击右边漂浮的分享程序，把好文章分享给你的小伙伴们！比来在搭建Openstack和Ceph的集群，因为集群中都存在多个节点，且节点间必要工夫的同步，以是必要利用NTP，又思索到有些时分收集情况是关闭的，以是必要本人搭建一个NTP的办事器办事器IP
脚色
申明
同步体例
192.168.100.203
NTPD办事
1、卖力与内部大众NTPD办事同步尺度工夫
2、作为表里收集的NTPD办事
NTPD办事光滑同步
192.168.40.***
表里NTP客户端
内网装备与192.168.100.203同步工夫
NTPD办事光滑同步
NTP工夫同步体例选择
NTP同步体例在linux下一样平常两种：利用ntpdate下令间接同步和利用NTPD办事光滑同步。有甚么区分呢，复杂说下，以免工夫长了，观点又含混。
现有一台装备，体系工夫是13:00,实在确当前工夫(在空中，大概卫星上，这里假定是在筹办同步的下级方针NTP办事器)是:12:30。假如我们利用ntpdate同步（ntpdate-u方针NTP办事器IP），操纵体系的工夫当即更新为12:30,假设，我们的体系有一个准时使用，是在天天12:40运转，那末实践明天这个的义务已运转过了（以后工夫是13:00嘛），如今被ntpdate修正为12:30，那末意味作10分钟后，又会实行一次义务，这就糟了，这个义务只能实行一次的嘛！！我想你（实际上是我）已懂了ntpdate工夫同步的隐患，固然这个例子有些极度，但切实其实是有风险的，临盆情况我不盘算这么干，仍是稳妥点好。以是办理该成绩的举措就是工夫光滑变动，不会让一个工夫点在一天内履历两次，这就是NTPD办事体例光滑同步工夫，它每次同步工夫的偏移量不会太陡，是渐渐来的（问：怎样来，没有细究，只知道一次一点的同步，完整同步好必要较长工夫，以是一样平常开启NTPD办事同步前先用ntpdate先手动同步一次）。
装置设置
CentOS6.3体系已自带了NTPD办事，一样平常默许是依照了的，假如没有装置，先反省下，然后设置好yum堆栈，yum体例装置下就OK，详细以下：
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[*]#rpm-qntp
假如没有装置，我们依照下
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[*]#yuminstallntp
按下面的装置体例在内网每台办事器上都装置好NTP软件包。
完成后，都必要设置NTP办事为自启动
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[*]#chkconfigntpdon
[*]
[*]#chkconfig--listntpd
在设置前，先利用ntpdate手动同步下工夫，以免本机与内部工夫办事器工夫差异太年夜，让ntpd不克不及一般同步。
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[*]#ntpdate-u202.112.10.36
[*]
[*]22Dec16:52:38ntpdate:adjusttimeserver202.112.10.36offset0.012135se
设置内网NTP-Server(192.168.100.203)
上面次要是设置内网的NPTD办事器(192.168.100.203),NTPD办事设置中心就在/etc/ntp.conf文件，设置好了就OK。网上出格是老外的文章都很复杂，我受骗了，妈哟，基本情况纷歧样，我们得中国特征才行。先上设置文件再说，白色局部是我的修正，其他的是默许。
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onesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#theadministrativefunctions.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict127.0.0.1<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict-6::1<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Hostsonlocalnetworkarelessrestricted.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#同意内网其他呆板同步工夫<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict192.168.40.0mask255.255.255.0nomodifynotrap<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Usepublicserversfromthepool.ntp.orgproject.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Pleaseconsiderjoiningthepool(http://www.pool.ntp.org/join.html).<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#中国这边最活泼的工夫办事器:http://www.pool.ntp.org/zone/cn<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">server210.72.145.44perfer#中国国度受时中央<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">server202.112.10.36#1.cn.pool.ntp.org<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">server59.124.196.83#0.asia.pool.ntp.org<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#broadcast192.168.40.255autokey#broadcastserver<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#broadcastclient#broadcastclient<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#broadcast224.0.1.1autokey#multicastserver<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#multicastclient224.0.1.1#multicastclient<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#manycastserver239.255.254.254#manycastserver<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#manycastclient239.255.254.254autokey#manycastclient<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#allowupdatetimebytheupperserver<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#同意下层工夫办事器自动修正本机工夫<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict210.72.145.44nomodifynotrapnoquery<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict202.112.10.36nomodifynotrapnoquery<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">restrict59.124.196.83nomodifynotrapnoquery<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#UndisciplinedLocalClock.Thisisafakedriverintendedforbackup<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#andwhennooutsidesourceofsynchronizedtimeisavailable.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#内部工夫办事器不成用时，以当地工夫作为工夫办事<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">server127.127.1.0#localclock<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">fudge127.127.1.0stratum10<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Enablepublickeycryptography.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#crypto<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">includefile/etc/ntp/crypto/pw<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Keyfilecontainingthekeysandkeyidentifiersusedwhenoperating<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#withsymmetrickeycryptography.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">keys/etc/ntp/keys<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Specifythekeyidentifierswhicharetrusted.<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#trustedkey4842<listyle="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;"><liclass="alt"style="margin:0px!important;padding:0px3px0px10px!important;border-style:nonenonenonesolid;border-left-width:3px;border-left-color:rgb(153,153,153);list-style:decimal-leading-zerooutside;color:rgb(238,238,238);line-height:18px;">#Specifythekeyidentifiertousewiththentpdcutility.
给大家带来Centos 下NTP情况的创立
广告位，，坐下看看 放手去搞。尽量不要提问，运用搜索找答案，或者看wiki，从原理上理解操作系统的本质，而不是满足于使用几个技巧。尽量看英文资料。 对Linux命令熟悉后，你可以开始搭建一个小的Linux网络，这是最好的实践方法。Linux是网络的代名词，Linux网络服务功能非常强大，不论是邮件服务器、Web服务器、DNS服务器等都非常完善。 编程学习及开发，Linux是免费，开源的操作系统，并且可开发工具相当多，如果您支持自由软件，一定要同广大热爱自由软件人士一同为其不懈努力。 直到学习Linux这门课以后，我才知道，原来我错了。? 如果你想深入学习Linux,看不懂因为文档实在是太难了。写的最好的、最全面的文档都是英语写的,最先发布的技术信息也都是用英语写的。 工具书对于学习者而言是相当重要的。一本错误观念的工具书却会让新手整个误入歧途。目前国内关于Linux的书籍有很多不过精品的不多。 熟悉操作是日常学习Linux中的三大法宝。以下是作者学习Linux的一些个人经验，供参考： 其实当你安装了一个完整的Linux系统后其中已经包含了一个强大的帮助，只是可能你还没有发现和使用它们的技巧。
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