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Linux系统时间老是不准怎么办

用户7135016900681
用户7135016900681
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一、使用 NTP 服务时间同步

  1. 安装 ntp

      
        
[root@node ~]# yum -y install ntp
  1. 启动 ntp 服务

      
        
[root@node ~]# systemctl start  ntpd  
[root@node ~]# systemctl enable  ntpd  
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
  1. 查看 ntp 服务

      
        
[root@node ~]# systemctl status ntpd  
● ntpd.service - Network Time Service  
   Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)  
   Active: active (running) since Thu 2022-08-04 08:00:47 CST; 7h left  
 Main PID: 20746 (ntpd)  
    Tasks: 1  
   Memory: 768.0K  
   CGroup: /system.slice/ntpd.service  
           └─20746 /usr/sbin/ntpd -u ntp:ntp -g  
  
Aug 04 08:00:47 node ntpd[20746]: Listen normally on 6 lo ::1 UDP 123  
Aug 04 08:00:47 node ntpd[20746]: Listen normally on 7 ens33 fe80::8a83:7297:7cb8:9934 UDP 123  
Aug 04 08:00:47 node ntpd[20746]: Listening on routing socket on fd #24 for interface updates  
Aug 04 08:00:47 node systemd[1]: Started Network Time Service.  
Aug 04 08:00:47 node ntpd[20746]: 0.0.0.0 c016 06 restart  
Aug 04 08:00:47 node ntpd[20746]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM  
Aug 04 08:00:47 node ntpd[20746]: 0.0.0.0 c011 01 freq_not_set  
Aug 04 08:00:56 node ntpd[20746]: 0.0.0.0 c61c 0c clock_step -28798.353463 s  
Aug 04 00:00:57 node ntpd[20746]: 0.0.0.0 c614 04 freq_mode  
Aug 04 00:00:58 node ntpd[20746]: 0.0.0.0 c618 08 no_sys_peer
  1. 修改 ntp.conf 文件

      
        
[root@node ~]# vim /etc/ntp.conf  
[root@node ~]# grep server /etc/ntp.conf   
# Use public servers from the pool.ntp.org project.  
#server 0.centos.pool.ntp.org iburst  
server ntp.aliyun.com iburst  
#broadcast 192.168.1.255 autokey # broadcast server  
#broadcast 224.0.1.1 autokey  # multicast server  
#manycastserver 239.255.254.254  # manycast server
  1. 重启服务

      
        
[root@node ~]# systemctl restart ntpd
  1. 检查同步状态

      
        
[root@node ~]# ntpq -p  
     remote           refid      st t when poll reach   delay   offset  jitter  
==============================================================================  
 203.107.6.88    100.107.25.114   2 u    2   64    1   30.975  149.499   0.393

二、使用 ntpdate 同步

  1. 使用 ntpd 命令同步

      
        
[root@node ~]# ntpdate ntp.aliyun.com  
 4 Aug 00:07:17 ntpdate[20924]: adjust time server 203.107.6.88 offset -0.001543 sec
  1. 查看时间

      
        
[root@node ~]# date  
Thu Aug  4 00:07:46 CST 2022

三、处理 ntpdate 同步失败报错处理方法

  1. 报错信息

      
        
cna02:~ # ntpdate ntp1.aliyun.com  
 4 Aug 07:23:41 ntpdate[18694]: the NTP socket is in use, exiting
  1. 处理方法

      
        
cna02:~ # service ntpd stop  
Redirecting to /bin/systemctl stop ntpd.service
  1. 重新同步

      
        
cna02:~ # ntpdate ntp1.aliyun.com  
 3 Aug 23:22:36 ntpdate[28980]: step time server 120.25.115.20 offset -28911.609110 sec
  1. 查看时间是否正确

      
        
cna02:~ # date  
Wed Aug  3 23:22:41 CST 2022

四、使用 chrony 服务时间同步

  1. 安装 chrony

      
        
[root@node ~]# yum -y install chrony  
Loaded plugins: fastestmirror, langpacks  
Loading mirror speeds from cached hostfile  
 * base: mirrors.bfsu.edu.cn  
 * extras: mirrors.bfsu.edu.cn  
 * updates: mirrors.bfsu.edu.cn  
Resolving Dependencies  
--> Running transaction check  
---> Package chrony.x86_64 0:3.2-2.el7 will be updated  
---> Package chrony.x86_64 0:3.4-1.el7 will be an update  
--> Finished Dependency Resolution  
  
Dependencies Resolved  
  
===============================================================================================================================================================================  
 Package                                  Arch                                     Version                                        Repository                              Size  
===============================================================================================================================================================================  
Updating:  
 chrony                                   x86_64                                   3.4-1.el7                                      base                                   251 k  
  
Transaction Summary  
===============================================================================================================================================================================  
Upgrade  1 Package  
  
Total download size: 251 k  
Downloading packages:  
No Presto metadata available for base  
chrony-3.4-1.el7.x86_64.rpm                                                                                                                             | 251 kB  00:00:00       
Running transaction check  
Running transaction test  
Transaction test succeeded  
Running transaction  
  Updating   : chrony-3.4-1.el7.x86_64                                                                                                                                     1/2   
  Cleanup    : chrony-3.2-2.el7.x86_64                                                                                                                                     2/2   
  Verifying  : chrony-3.4-1.el7.x86_64                                                                                                                                     1/2   
  Verifying  : chrony-3.2-2.el7.x86_64                                                                                                                                     2/2   
  
Updated:  
  chrony.x86_64 0:3.4-1.el7                                                                                                                                                      
  
Complete!
  1. 启动 chrony 服务

      
        
[root@node ~]# systemctl enable --now chronyd  
Created symlink from /etc/systemd/system/multi-user.target.wants/chronyd.service to /usr/lib/systemd/system/chronyd.service.
  1. 查看 chrony 状态

      
        
[root@node ~]# systemctl status chronyd  
● chronyd.service - NTP client/server  
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)  
   Active: active (running) since Thu 2022-08-04 00:12:27 CST; 29s ago  
     Docs: man:chronyd(8)  
           man:chrony.conf(5)  
  Process: 21136 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exited, status=0/SUCCESS)  
  Process: 21132 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCCESS)  
 Main PID: 21134 (chronyd)  
    Tasks: 1  
   Memory: 364.0K  
   CGroup: /system.slice/chronyd.service  
           └─21134 /usr/sbin/chronyd  
  
Aug 04 00:12:27 node systemd[1]: Starting NTP client/server...  
Aug 04 00:12:27 node chronyd[21134]: chronyd version 3.4 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)  
Aug 04 00:12:27 node systemd[1]: Started NTP client/server.  
Aug 04 00:12:35 node chronyd[21134]: Selected source 193.182.111.141  
Aug 04 00:12:35 node chronyd[21134]: Source 78.46.102.180 replaced with 94.237.64.20
  1. 修改配置文件

      
        
[root@node ~]# grep server /etc/chrony.conf   
# Use public servers from the pool.ntp.org project.  
#server 0.centos.pool.ntp.org iburst  
#server 1.centos.pool.ntp.org iburst  
#server 3.centos.pool.ntp.org iburst  
server ntp1.aliyun.com iburst
  1. 重启服务

      
        
[root@node ~]# systemctl restart chronyd
  1. 检查时间同步状态

      
        
[root@node ~]# chronyc sources  
210 Number of sources = 1  
MS Name/IP address         Stratum Poll Reach LastRx Last sample                 
===============================================================================  
^* 120.25.115.20                 2   6    71    26   +751us[+1549us] +/-   19ms

五、手动修改时间

  1. 修改时间方法 1

      
        
[root@node ~]# date -s "2012-05-23 01:01:01"  
Wed May 23 01:01:01 CST 2012  
[root@node ~]# date  
Wed May 23 01:01:05 CST 2012
  1. 修改时间方法 2

修改时间顺序为月日时分年. 秒


      
        
[root@tianyi ~]# date 090621282021.28  
Mon Sep  6 21:28:28 CST 2021
  1. 硬件时间向系统时间同步

      
        
[root@node ~]# hwclock -w
  1. 按格式输出时间

      
        
[root@node ~]# date "+%Y-%m-%d %H:%M:%S"  
2012-05-23 01:04:10
  1. 设置时区

      
        
[root@tianyi backups]# timedatectl list-timezones |grep Shanghai  
Asia/Shanghai  
[root@tianyi backups]# timedatectl set-timezone Asia/Shanghai

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