Linux系统时间同步方法
使用NTP服务时间同步
1、安装ntp。
[root@k8s-master01 ~]# yum -y install ntp
2、启动ntp服务。
[root@k8s-master01 ~]# systemctl start ntpd
[root@k8s-master01 ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
3、查看ntp服务。
[root@k8s-master01 ~]# 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
4、修改ntp.conf文件。
# 添加如下内容
[root@k8s-master01 ~]# vim /etc/ntp.conf
[root@k8s-master01 ~]# grep server /etc/ntp.conf
server ntp.aliyun.com iburst
5、重启服务。
[root@k8s-master01 ~]# systemctl restart ntpd
6、检查同步状态。
[root@k8s-master01 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*stratum2-1.ntp. 194.190.168.1 2 u 4 64 1 170.653 6.791 40.306
+ntp1.as200552.n 195.66.241.3 2 u 4 64 1 236.322 9.481 32.132
+time.cloudflare 10.190.9.35 3 u 3 64 1 220.805 -17.283 20.695
-time.cloudflare 10.210.8.4 3 u 2 64 1 242.932 -4.425 43.233
-203.107.6.88 100.107.25.114 2 u 1 64 1 41.403 -17.157 11.194
使用ntpdate同步
1、使用ntpd命令同步。
[root@k8s-master01 ~]# ntpdate ntp.aliyun.com
14 Apr 08:51:28 ntpdate[1301]: adjust time server 203.107.6.88 offset 0.000744 sec
2、查看时间。
[root@k8s-master01 ~]# date
Fri Apr 14 08:51:53 CST 2023
使用chrony服务同步时间
1、安装chrony服务。
[root@k8s-master01 ~]# yum -y install chrony
Loaded plugins: fastestmirror
Determining fastest mirrors
base | 3.6 kB 00:00
docker-ce-stable | 3.5 kB 00:00
extras | 2.9 kB 00:00
kubernetes | 1.4 kB 00:00
updates | 2.9 kB 00:00
wlnmp | 2.9 kB 00:00
(1/8): docker-ce-stable/7/x86_64/updateinfo | 55 B 00:00
(2/8): base/7/x86_64/group_gz | 153 kB 00:01
(3/8): docker-ce-stable/7/x86_64/primary_db | 102 kB 00:01
(4/8): kubernetes/primary | 129 kB 00:00
(5/8): extras/7/x86_64/primary_db | 249 kB 00:01
(6/8): wlnmp/7/x86_64/primary_db | 310 kB 00:00
(7/8): base/7/x86_64/primary_db | 6.1 MB 00:25
(8/8): updates/7/x86_64/primary_db | 20 MB 01:17
kubernetes 953/953
Package chrony-3.4-1.el7.x86_64 already installed and latest version
Nothing to do
2、启动chrony服务。
[root@k8s-master01 ~]# systemctl enable --now chronyd
3、查看chrony服务状态。
[root@k8s-master01 ~]# systemctl status chronyd
● chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2023-04-14 08:55:42 CST; 1min 34s ago
Docs: man:chronyd(8)
man:chrony.conf(5)
Process: 1363 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exited, status=0/SUCCESS)
Process: 1359 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 1361 (chronyd)
CGroup: /system.slice/chronyd.service
└─1361 /usr/sbin/chronyd
Apr 14 08:55:42 k8s-master01 systemd[1]: Starting NTP client/server...
Apr 14 08:55:42 k8s-master01 chronyd[1361]: chronyd version 3.4 star...
Apr 14 08:55:42 k8s-master01 chronyd[1361]: Frequency -93.957 +/- 22...
Apr 14 08:55:42 k8s-master01 systemd[1]: Started NTP client/server.
Apr 14 08:55:50 k8s-master01 chronyd[1361]: Selected source 2606:470...
Apr 14 08:55:53 k8s-master01 chronyd[1361]: Source 193.182.111.142 r...
Hint: Some lines were ellipsized, use -l to show in full.
4、给chrony服务配置文件添加内容。
[root@k8s-master01 ~]# vim /etc/chrony.conf
# 添加内容如下
server ntp1.aliyun.com iburst
5、重启服务。
[root@k8s-master01 ~]# systemctl restart chronyd
6、检查时间同步状态。
[root@k8s-master01 ~]# chronyc sources
210 Number of sources = 4
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? tick.ntp.infomaniak.ch 0 6 0 - +0ns[ +0ns] +/- 0ns
^+ vsrv02141.customer.xenwa> 3 6 17 37 +11ms[+1532us] +/- 140ms
^+ 2402:4e00:1800:f800:0:95> 2 6 17 38 +20ms[ +11ms] +/- 133ms
^* time.cloudflare.com 3 6 17 37 +2046us[-7170us] +/- 129ms
手动修改时间
1、修改时间方法1
[root@k8s-master01 ~]# date -s "2012-05-23 01:01:01"
Wed May 23 01:01:01 CST 2012
[root@k8s-master01 ~]# date
Wed May 23 01:01:05 CST 2012
2、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
3、硬件时间向系统时间同步
[root@k8s-master01 ~]# hwclock -w
4、按格式输出时间
[root@k8s-master01 ~]# date "+%Y-%m-%d %H:%M:%S"
2012-05-23 01:04:10
5、设置时区
[root@k8s-master01 ~]# timedatectl list-timezones | grep Shanghai
Asia/Shanghai
[root@k8s-master01 ~]# timedatectl set-timezone Asia/Shanghai
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