一、使用 NTP 服务时间同步
- 安装 ntp
[root@node ~]# yum -y install ntp
- 启动 ntp 服务
[root@node ~]# systemctl start ntpd[root@node ~]# systemctl enable ntpdCreated symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
- 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 -gAug 04 08:00:47 node ntpd[20746]: Listen normally on 6 lo ::1 UDP 123Aug 04 08:00:47 node ntpd[20746]: Listen normally on 7 ens33 fe80::8a83:7297:7cb8:9934 UDP 123Aug 04 08:00:47 node ntpd[20746]: Listening on routing socket on fd #24 for interface updatesAug 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 restartAug 04 08:00:47 node ntpd[20746]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPMAug 04 08:00:47 node ntpd[20746]: 0.0.0.0 c011 01 freq_not_setAug 04 08:00:56 node ntpd[20746]: 0.0.0.0 c61c 0c clock_step -28798.353463 sAug 04 00:00:57 node ntpd[20746]: 0.0.0.0 c614 04 freq_modeAug 04 00:00:58 node ntpd[20746]: 0.0.0.0 c618 08 no_sys_peer
- 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 iburstserver 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
- 重启服务
[root@node ~]# systemctl restart ntpd
- 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
- 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
- 查看时间
[root@node ~]# dateThu Aug 4 00:07:46 CST 2022
三、处理 ntpdate 同步失败报错处理方法
- 报错信息
cna02:~ # ntpdate ntp1.aliyun.com 4 Aug 07:23:41 ntpdate[18694]: the NTP socket is in use, exiting
- 处理方法
cna02:~ # service ntpd stopRedirecting to /bin/systemctl stop ntpd.service
- 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
- 查看时间是否正确
cna02:~ # dateWed Aug 3 23:22:41 CST 2022
四、使用 chrony 服务时间同步
- 安装 chrony
[root@node ~]# yum -y install chronyLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * base: mirrors.bfsu.edu.cn * extras: mirrors.bfsu.edu.cn * updates: mirrors.bfsu.edu.cnResolving 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 ResolutionDependencies Resolved=============================================================================================================================================================================== Package Arch Version Repository Size===============================================================================================================================================================================Updating: chrony x86_64 3.4-1.el7 base 251 kTransaction Summary===============================================================================================================================================================================Upgrade 1 PackageTotal download size: 251 kDownloading packages:No Presto metadata available for basechrony-3.4-1.el7.x86_64.rpm | 251 kB 00:00:00 Running transaction checkRunning transaction testTransaction test succeededRunning 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!
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