Linux集群部署自定義時間同步服務器（ntpd）
作者：尹正傑
版權聲明：原創作品，謝絕轉載！否則將追究法律責任。
身為一名運維人員，在搭建集群的時候，第一步需要做的就是同步每個機器的時間，尤其是在部署類似VPN這種服務，你不同步時間是會遇到坑的，我之前在部署openVPN是就遇到過類似的問題，我們通常對時間同步的方式：找一個機器（當然這個服務器可以是局域網的也可以是廣域網的喲），作為時間服務器，所有的機器與這台集群時間進行定時的同步，比如，每隔十分鍾，同步一次時間。
一.安裝ntp軟件
1>.操作平台
[yinzhengjie@node101 ~]$ free -m total used free shared buff/cache available Mem: 7808 133 7444 8 230 7465 Swap: 2047 0 2047 [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ uname -r 3.10.0-327.el7.x86_64 [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ uname -m x86_64 [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ hostname -i 172.30.1.101 [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ cat /etc/hosts | grep yinzhengjie 172.30.1.101 node101.yinzhengjie.org.cn 172.30.1.102 node102.yinzhengjie.org.cn 172.30.1.103 node103.yinzhengjie.org.cn [yinzhengjie@node101 ~]$
2>.檢查ntp軟件是否安裝
[yinzhengjie@s101 ~]$ rpm -qa | grep ntp #如果沒有內容輸出，則說明沒有按照ntp服務
3>.使用root權限安裝ntp軟件
[yinzhengjie@s101 ~]$ sudo yum -y install ntp [sudo] password for yinzhengjie: Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/2): extras/7/x86_64/primary_db | 174 kB 00:00:00 (2/2): updates/7/x86_64/primary_db | 5.2 MB 00:00:02 Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: ftp.sjtu.edu.cn Resolving Dependencies --> Running transaction check ---> Package ntp.x86_64 0:4.2.6p5-28.el7.centos will be installed --> Processing Dependency: ntpdate = 4.2.6p5-28.el7.centos for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Processing Dependency: libcrypto.so.10(OPENSSL_1.0.2)(64bit) for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Processing Dependency: libopts.so.25()(64bit) for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Running transaction check ---> Package autogen-libopts.x86_64 0:5.18-5.el7 will be installed ---> Package ntpdate.x86_64 0:4.2.6p5-28.el7.centos will be installed ---> Package openssl-libs.x86_64 1:1.0.1e-42.el7.9 will be updated --> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7.9 for package: 1:openssl-1.0.1e-42.el7.9.x86_64 ---> Package openssl-libs.x86_64 1:1.0.2k-12.el7 will be an update --> Running transaction check ---> Package openssl.x86_64 1:1.0.1e-42.el7.9 will be updated ---> Package openssl.x86_64 1:1.0.2k-12.el7 will be an update --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================================================================================================= Package Arch Version Repository Size ======================================================================================================================================================================================= Installing: ntp x86_64 4.2.6p5-28.el7.centos base 549 k Installing for dependencies: autogen-libopts x86_64 5.18-5.el7 base 66 k ntpdate x86_64 4.2.6p5-28.el7.centos base 86 k Updating for dependencies: openssl x86_64 1:1.0.2k-12.el7 base 492 k openssl-libs x86_64 1:1.0.2k-12.el7 base 1.2 M Transaction Summary ======================================================================================================================================================================================= Install 1 Package (+2 Dependent packages) Upgrade ( 2 Dependent packages) Total download size: 2.4 M Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. (1/5): ntpdate-4.2.6p5-28.el7.centos.x86_64.rpm | 86 kB 00:00:00 (2/5): autogen-libopts-5.18-5.el7.x86_64.rpm | 66 kB 00:00:00 (3/5): openssl-1.0.2k-12.el7.x86_64.rpm | 492 kB 00:00:00 (4/5): ntp-4.2.6p5-28.el7.centos.x86_64.rpm | 549 kB 00:00:00 (5/5): openssl-libs-1.0.2k-12.el7.x86_64.rpm | 1.2 MB 00:00:01 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 1.6 MB/s | 2.4 MB 00:00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : 1:openssl-libs-1.0.2k-12.el7.x86_64 1/7 Installing : ntpdate-4.2.6p5-28.el7.centos.x86_64 2/7 Installing : autogen-libopts-5.18-5.el7.x86_64 3/7 Installing : ntp-4.2.6p5-28.el7.centos.x86_64 4/7 Updating : 1:openssl-1.0.2k-12.el7.x86_64 5/7 Cleanup : 1:openssl-1.0.1e-42.el7.9.x86_64 6/7 Cleanup : 1:openssl-libs-1.0.1e-42.el7.9.x86_64 7/7 Verifying : ntpdate-4.2.6p5-28.el7.centos.x86_64 1/7 Verifying : ntp-4.2.6p5-28.el7.centos.x86_64 2/7 Verifying : autogen-libopts-5.18-5.el7.x86_64 3/7 Verifying : 1:openssl-1.0.2k-12.el7.x86_64 4/7 Verifying : 1:openssl-libs-1.0.2k-12.el7.x86_64 5/7 Verifying : 1:openssl-libs-1.0.1e-42.el7.9.x86_64 6/7 Verifying : 1:openssl-1.0.1e-42.el7.9.x86_64 7/7 Installed: ntp.x86_64 0:4.2.6p5-28.el7.centos Dependency Installed: autogen-libopts.x86_64 0:5.18-5.el7 ntpdate.x86_64 0:4.2.6p5-28.el7.centos Dependency Updated: openssl.x86_64 1:1.0.2k-12.el7 openssl-libs.x86_64 1:1.0.2k-12.el7 Complete! [yinzhengjie@s101 ~]$
4>.檢查是否安裝成功
[yinzhengjie@s101 ~]$ rpm -qa | grep ntp #有內容輸出，則說明安裝成功，安裝完畢會有以下出輸出內容 ntpdate-4.2.6p5-28.el7.centos.x86_64 ntp-4.2.6p5-28.el7.centos.x86_64 [yinzhengjie@s101 ~]$
二.集群中時間服務器配置（需要root權限）
1>.設置本地網絡上的主機不受限制
[yinzhengjie@node101 ~]$ grep \#restrict /etc/ntp.conf #查看修改前的內容 #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ sudo sed -i 's@\#restrict@restrict@' /etc/ntp.conf #編輯配置文件，將注釋去掉,表示啟用授權功能 [sudo] password for yinzhengjie: [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ grep 192.168.1.0 /etc/ntp.conf #查看修改后的內容 restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap [yinzhengjie@node101 ~]$ [yinzhengjie@node101 ~]$ su root Password: [root@node101 yinzhengjie]# [root@node101 yinzhengjie]# sed -i 's#192.168.1.0#172.30.1.0#' /etc/ntp.conf #授權只有172.30.1.0網段的服務器可以來同步時間，其實我發現不修改咱能也能通過ntpdate來進行時間同步. [root@node101 yinzhengjie]#
2>.注釋默認的時間服務器（設置為不采用公共的服務器）
[yinzhengjie@s101 ~]$ grep ^server /etc/ntp.conf #查看官方默認的時間服務器 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 [yinzhengjie@s101 ~]$ [yinzhengjie@s101 ~]$ sudo sed -i 's@^server@#server@' /etc/ntp.conf #編輯配置文件，將官方的配置注釋掉 [sudo] password for yinzhengjie: [yinzhengjie@s101 ~]$ [yinzhengjie@s101 ~]$ grep ^#server /etc/ntp.conf #再次查看，檢驗是否修改成功 #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 [yinzhengjie@s101 ~]$
3>.設置自定義時間服務器（添加默認的一個內部時鍾數據，使用它為局域網用戶提供服務）
[yinzhengjie@s101 ~]$ su root Password: [root@s101 yinzhengjie]# echo "#Add by yinzhengjie" >> /etc/ntp.conf [root@s101 yinzhengjie]# echo "server 127.127.1.0" >> /etc/ntp.conf #將本地時間作為時間同步源 [root@s101 yinzhengjie]# echo "fudge 127.127.1.0 stratum 10" >> /etc/ntp.conf #指定間隔更新時間，我這里指定的是10分鍾。stratum(層級)的值不能太大，如果要向上級NTP更新可以設成2. [root@s101 yinzhengjie]# [root@s101 yinzhengjie]# tail -3 /etc/ntp.conf #Add by yinzhengjie server 127.127.1.0 fudge 127.127.1.0 stratum 10 [root@s101 yinzhengjie]# [root@s101 yinzhengjie]# exit exit [yinzhengjie@s101 ~]$
4>.修改/etc/sysconfig/ntpd 文件
[yinzhengjie@s101 ~]$ su root Password: [root@s101 yinzhengjie]# cat /etc/sysconfig/ntpd # Command line options for ntpd OPTIONS="-g" [root@s101 yinzhengjie]# echo SYNC_HWCLOCK=yes >> /etc/sysconfig/ntpd #讓硬件時間和系統時間一起同步 [root@s101 yinzhengjie]# [root@s101 yinzhengjie]# cat /etc/sysconfig/ntpd # Command line options for ntpd OPTIONS="-g" SYNC_HWCLOCK=yes [root@s101 yinzhengjie]# exit exit [yinzhengjie@s101 ~]$
5>.啟動ntpd
[root@node101 yinzhengjie]# systemctl start ntpd #啟動ntp服務 [root@node101 yinzhengjie]# [root@node101 yinzhengjie]# systemctl enable ntpd #設置開機自啟 Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service. [root@node101 yinzhengjie]# [root@node101 yinzhengjie]# systemctl status ntpd ● ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled) Active: active (running) since Mon 2018-10-01 13:00:24 CST; 9min ago Main PID: 2760 (ntpd) CGroup: /system.slice/ntpd.service └─2760 /usr/sbin/ntpd -u ntp:ntp -g Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: ntp_io: estimated max descriptors: 1024, initial socket boundary: 16 Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123 Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: Listen and drop on 1 v6wildcard :: UDP 123 Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: Listen normally on 2 lo 127.0.0.1 UDP 123 Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: Listen normally on 3 ens33 172.30.1.101 UDP 123 Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: Listening on routing socket on fd #20 for interface updates Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: 0.0.0.0 c016 06 restart Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM Oct 01 13:00:24 node101.yinzhengjie.org.cn ntpd[2760]: 0.0.0.0 c011 01 freq_not_set Oct 01 13:00:31 node101.yinzhengjie.org.cn ntpd[2760]: 0.0.0.0 c614 04 freq_mode [root@node101 yinzhengjie]#
三.集群中其它節點(ntpd客戶端)配置（安裝后需要啟動ntpd）
1>.安裝ntp服務
[yinzhengjie@s102 ~]$ sudo yum -y install ntp We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for yinzhengjie: Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 (1/2): extras/7/x86_64/primary_db | 174 kB 00:00:00 (2/2): updates/7/x86_64/primary_db | 5.2 MB 00:00:02 Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: ftp.sjtu.edu.cn Resolving Dependencies --> Running transaction check ---> Package ntp.x86_64 0:4.2.6p5-28.el7.centos will be installed --> Processing Dependency: ntpdate = 4.2.6p5-28.el7.centos for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Processing Dependency: libcrypto.so.10(OPENSSL_1.0.2)(64bit) for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Processing Dependency: libopts.so.25()(64bit) for package: ntp-4.2.6p5-28.el7.centos.x86_64 --> Running transaction check ---> Package autogen-libopts.x86_64 0:5.18-5.el7 will be installed ---> Package ntpdate.x86_64 0:4.2.6p5-28.el7.centos will be installed ---> Package openssl-libs.x86_64 1:1.0.1e-42.el7.9 will be updated --> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7.9 for package: 1:openssl-1.0.1e-42.el7.9.x86_64 ---> Package openssl-libs.x86_64 1:1.0.2k-12.el7 will be an update --> Running transaction check ---> Package openssl.x86_64 1:1.0.1e-42.el7.9 will be updated ---> Package openssl.x86_64 1:1.0.2k-12.el7 will be an update --> Finished Dependency Resolution Dependencies Resolved ======================================================================================================================================================================================= Package Arch Version Repository Size ======================================================================================================================================================================================= Installing: ntp x86_64 4.2.6p5-28.el7.centos base 549 k Installing for dependencies: autogen-libopts x86_64 5.18-5.el7 base 66 k ntpdate x86_64 4.2.6p5-28.el7.centos base 86 k Updating for dependencies: openssl x86_64 1:1.0.2k-12.el7 base 492 k openssl-libs x86_64 1:1.0.2k-12.el7 base 1.2 M Transaction Summary ======================================================================================================================================================================================= Install 1 Package (+2 Dependent packages) Upgrade ( 2 Dependent packages) Total download size: 2.4 M Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. (1/5): autogen-libopts-5.18-5.el7.x86_64.rpm | 66 kB 00:00:00 (2/5): ntpdate-4.2.6p5-28.el7.centos.x86_64.rpm | 86 kB 00:00:00 (3/5): openssl-1.0.2k-12.el7.x86_64.rpm | 492 kB 00:00:00 (4/5): ntp-4.2.6p5-28.el7.centos.x86_64.rpm | 549 kB 00:00:00 (5/5): openssl-libs-1.0.2k-12.el7.x86_64.rpm | 1.2 MB 00:00:02 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 1.0 MB/s | 2.4 MB 00:00:02 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : 1:openssl-libs-1.0.2k-12.el7.x86_64 1/7 Installing : ntpdate-4.2.6p5-28.el7.centos.x86_64 2/7 Installing : autogen-libopts-5.18-5.el7.x86_64 3/7 Installing : ntp-4.2.6p5-28.el7.centos.x86_64 4/7 Updating : 1:openssl-1.0.2k-12.el7.x86_64 5/7 Cleanup : 1:openssl-1.0.1e-42.el7.9.x86_64 6/7 Cleanup : 1:openssl-libs-1.0.1e-42.el7.9.x86_64 7/7 Verifying : ntpdate-4.2.6p5-28.el7.centos.x86_64 1/7 Verifying : ntp-4.2.6p5-28.el7.centos.x86_64 2/7 Verifying : autogen-libopts-5.18-5.el7.x86_64 3/7 Verifying : 1:openssl-1.0.2k-12.el7.x86_64 4/7 Verifying : 1:openssl-libs-1.0.2k-12.el7.x86_64 5/7 Verifying : 1:openssl-libs-1.0.1e-42.el7.9.x86_64 6/7 Verifying : 1:openssl-1.0.1e-42.el7.9.x86_64 7/7 Installed: ntp.x86_64 0:4.2.6p5-28.el7.centos Dependency Installed: autogen-libopts.x86_64 0:5.18-5.el7 ntpdate.x86_64 0:4.2.6p5-28.el7.centos Dependency Updated: openssl.x86_64 1:1.0.2k-12.el7 openssl-libs.x86_64 1:1.0.2k-12.el7 Complete! [yinzhengjie@s102 ~]$
2>.編寫時間同步腳本（在其他機器配置1分鍾與時間服務器同步一次）
[yinzhengjie@s102 ~]$ sudo crontab -e #編輯同步腳本 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for yinzhengjie: no crontab for root - using an empty one crontab: installing new crontab [yinzhengjie@s102 ~]$ sudo crontab -l #查看已經編輯的周期執行任務 */1 * * * * /usr/sbin/ntpdate s101 #注意，在crontab中的命令必須得寫絕對路徑，否則會拋異常說命令找不到喲！ [yinzhengjie@s102 ~]$
3>.其它節點配置重復以上操作
注意需要使用root 權限，如果你沒有root權限，如果你在公司沒有root權限的話，可以請求運維幫你提供相關命令的sudo權限喲，其它機器的配置只需要安裝ntp服務和編寫周期性任務腳本即可。我上面就配置了一個節點，其它節點我也做了類似的調整。
四.驗證各節點是否與時間服務器同步
1>.編寫管理集群的"xcall.sh"腳本
以下腳本的執行需要配置無秘鑰登錄，關於如何配置無秘鑰登錄可以參考我之前的筆記：https://www.cnblogs.com/yinzhengjie/p/9065191.html。
[yinzhengjie@s101 ~]$ more `which xcall.sh` #!/bin/bash #@author :yinzhengjie #blog:http://www.cnblogs.com/yinzhengjie #EMAIL:y1053419035@qq.com #判斷用戶是否傳參 if [ $# -lt 1 ];then echo "請輸入參數" exit fi #獲取用戶輸入的命令 cmd=$@ for (( i=101;i<=105;i++ )) do #使終端變綠色 tput setaf 2 echo ============= s$i $cmd ============ #使終端變回原來的顏色，即白灰色 tput setaf 7 #遠程執行命令 ssh s$i $cmd #判斷命令是否執行成功 if [ $? == 0 ];then echo "命令執行成功" fi done [yinzhengjie@s101 ~]$
2>.檢查各個節點配置
[yinzhengjie@s101 ~]$ sudo xcall.sh crontab -l sudo: timestamp too far in the future: Aug 21 10:54:52 2018 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for yinzhengjie: [root@s101 yinzhengjie]# xcall.sh crontab -l ============= s101 crontab -l ============ no crontab for root ============= s102 crontab -l ============ */1 * * * * /usr/sbin/ntpdate s101 命令執行成功 ============= s103 crontab -l ============ */1 * * * * /usr/sbin/ntpdate s101 命令執行成功 ============= s104 crontab -l ============ */1 * * * * /usr/sbin/ntpdate s101 命令執行成功 ============= s105 crontab -l ============ */1 * * * * /usr/sbin/ntpdate s101 命令執行成功 [root@s101 yinzhengjie]# [root@s101 yinzhengjie]# exit exit [yinzhengjie@s101 ~]$ [yinzhengjie@s101 ~]$
3>.檢查集群當前服務器時間
[yinzhengjie@s101 ~]$ xcall.sh date ============= s101 date ============ Sun Oct 1 11:29:26 EDT 2017 命令執行成功 ============= s102 date ============ Sun Oct 1 11:29:26 EDT 2017 命令執行成功 ============= s103 date ============ Sun Oct 1 11:29:26 EDT 2017 命令執行成功 ============= s104 date ============ Sun Oct 1 11:29:26 EDT 2017 命令執行成功 ============= s105 date ============ Sun Oct 1 11:29:26 EDT 2017 命令執行成功 [yinzhengjie@s101 ~]$
4>.修改服務器時間，並查看其它節點是否跟隨時間服務器的修改而修改
[yinzhengjie@s101 ~]$ sudo date -s "2018-8-21 14:14:11" [sudo] password for yinzhengjie: Tue Aug 21 14:14:11 EDT 2018 [yinzhengjie@s101 ~]$ [yinzhengjie@s101 ~]$ [yinzhengjie@s101 ~]$ xcall.sh date ============= s101 date ============ Tue Aug 21 14:16:51 EDT 2018 命令執行成功 ============= s102 date ============ Tue Aug 21 14:16:51 EDT 2018 命令執行成功 ============= s103 date ============ Tue Aug 21 14:16:52 EDT 2018 命令執行成功 ============= s104 date ============ Tue Aug 21 14:16:52 EDT 2018 命令執行成功 ============= s105 date ============ Tue Aug 21 14:16:52 EDT 2018 命令執行成功 [yinzhengjie@s101 ~]$
五.將系統時間和服務器硬件時間同步
[root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# hwclock #注意，這是查看硬件時間 Mon 10 Jun 2019 09:29:11 PM CST -0.694751 seconds [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# date #查看系統時間 Mon Jun 10 21:29:15 CST 2019 [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# date -s "2019-06-10 14:44:00" #我們修改了系統時間 Mon Jun 10 14:44:00 CST 2019 [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# date #系統時間的確是發生了修改 Mon Jun 10 14:44:02 CST 2019 [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# hwclock #硬件時間卻沒有跟着變化 Mon 10 Jun 2019 09:29:47 PM CST -0.803342 seconds [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# date Mon Jun 10 14:44:09 CST 2019 [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# hwclock -w #於是我們把系統時間和硬件時間進行同步 [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# hwclock #再次查看硬件時間 Mon 10 Jun 2019 02:44:21 PM CST -0.600744 seconds [root@node101.yinzhengjie.org.cn ~]# [root@node101.yinzhengjie.org.cn ~]# date Mon Jun 10 14:44:25 CST 2019 [root@node101.yinzhengjie.org.cn ~]#