# 步骤1：查看当前时区
$ timedatectl
Local time: Wed 2026-04-02 10:00:00 CST
Universal time: Wed 2026-04-02 02:00:00 UTC
RTC time: Wed 2026-04-02 02:00:00
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no

# 步骤2：列出所有时区
$ timedatectl list-timezones | grep -i shanghai
Asia/Shanghai

# 步骤3：设置时区为上海
$ sudo timedatectl set-timezone Asia/Shanghai

# 步骤4：验证时区设置
$ timedatectl
Local time: Wed 2026-04-02 10:00:00 CST
Universal time: Wed 2026-04-02 02:00:00 UTC
RTC time: Wed 2026-04-02 02:00:00
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no

# 步骤5：查看当前时间
$ date
Wed Apr 2 10:00:00 CST 2026

# 步骤6：手动设置时间（不推荐，仅用于测试）
$ sudo timedatectl set-time “2026-04-02 10:00:00”

# 步骤7：启用NTP同步
$ sudo timedatectl set-ntp true

# 步骤8：验证NTP状态
$ timedatectl
Local time: Wed 2026-04-02 10:00:00 CST
Universal time: Wed 2026-04-02 02:00:00 UTC
RTC time: Wed 2026-04-02 02:00:00
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no

# 步骤1：安装chrony
$ sudo dnf install -y chrony
Updating Subscription Management repositories.
Last metadata expiration check: 0:00:00 ago on Wed Apr 2 10:00:00 2026.
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
chrony x86_64 4.2-1.el9_3.1 rhel-10-baseos 345 k
Installing dependencies:
libedit x86_64 3.1-38.20210728cvs.el9 rhel-10-baseos 102 k
Transaction Summary
================================================================================
Install 2 Packages

Total download size: 447 k
Installed size: 1.2 M
Downloading Packages:
[1/2] libedit-3.1-38.20210728cvs.el9.x86_64.rpm 102 kB/s | 102 kB 00:00
[2/2] chrony-4.2-1.el9_3.1.x86_64.rpm 345 kB/s | 345 kB 00:00
——————————————————————————–
Total 447 kB/s | 447 kB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/2
Installing : libedit-3.1-38.20210728cvs.el9.x86_64 1/2
Installing : chrony-4.2-1.el9_3.1.x86_64 2/2
Running scriptlet: chrony-4.2-1.el9_3.1.x86_64 2/2
Verifying : libedit-3.1-38.20210728cvs.el9.x86_64 1/2
Verifying : chrony-4.2-1.el9_3.1.x86_64 2/2

Installed:
chrony-4.2-1.el9_3.1.x86_64
libedit-3.1-38.20210728cvs.el9.x86_64

Complete!

# 步骤2：启动chrony服务
$ sudo systemctl enable –now chronyd
Created symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.

# 步骤3：查看chrony配置文件
$ cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
pool 2.rhel.pool.ntp.org iburst

# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Allow step adjustments only at the first update.
makestep 1.0 3

# Enable kernel RTC synchronization.
rtcsync

# Specify the directory where log files will be written.
logdir /var/log/chrony

# 步骤4：修改chrony配置
$ sudo vi /etc/chrony.conf
# 添加以下配置
server ntp1.aliyun.com iburst
server ntp2.aliyun.com iburst
server ntp3.aliyun.com iburst
server ntp4.aliyun.com iburst

# 步骤5：重启chrony服务
$ sudo systemctl restart chronyd

# 步骤6：查看chrony状态
$ sudo systemctl status chronyd
● chronyd.service – NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2026-04-02 10:00:00 CST; 10s ago
Docs: man:chronyd(8)
man:chrony.conf(5)
Main PID: 1234 (chronyd)
Tasks: 1 (limit: 4915)
Memory: 1.2M
CGroup: /system.slice/chronyd.service
└─1234 /usr/sbin/chronyd

# 步骤7：查看时间同步状态
$ chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp1.aliyun.com 2 6 377 10 +123us[+234us] +/- 12ms
^- ntp2.aliyun.com 2 6 377 11 -456us[-345us] +/- 13ms
^+ ntp3.aliyun.com 2 6 377 12 +789us[+890us] +/- 11ms
^+ ntp4.aliyun.com 2 6 377 13 -234us[-123us] +/- 14ms

# 步骤8：查看时间同步详细信息
$ chronyc tracking
Reference ID : 12345678 (ntp1.aliyun.com)
Stratum : 3
Ref time (UTC) : Wed Apr 2 02:00:00 2026
System time : 0.000000000 seconds fast of NTP time
Last offset : +0.000123456 seconds
RMS offset : 0.000234567 seconds
Frequency : 12.345 ppm slow
Residual freq : +0.123 ppm
Skew : 0.456 ppm
Root delay : 0.012345678 seconds
Root dispersion : 0.023456789 seconds
Update interval : 64.2 seconds
Leap status : Normal

# 步骤1：安装ntp
$ sudo dnf install -y ntp
Updating Subscription Management repositories.
Last metadata expiration check: 0:00:00 ago on Wed Apr 2 10:00:00 2026.
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
ntp x86_64 4.2.8p15-5.el9_3.1 rhel-10-baseos 456 k
Installing dependencies:
ntpdate x86_64 4.2.8p15-5.el9_3.1 rhel-10-baseos 123 k
Transaction Summary
================================================================================
Install 2 Packages

Total download size: 579 k
Installed size: 1.5 M
Downloading Packages:
[1/2] ntpdate-4.2.8p15-5.el9_3.1.x86_64.rpm 123 kB/s | 123 kB 00:00
[2/2] ntp-4.2.8p15-5.el9_3.1.x86_64.rpm 456 kB/s | 456 kB 00:00
——————————————————————————–
Total 579 kB/s | 579 kB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Running scriptlet: ntpdate-4.2.8p15-5.el9_3.1.x86_64 1/2
Running scriptlet: ntp-4.2.8p15-5.el9_3.1.x86_64 2/2
Verifying : ntpdate-4.2.8p15-5.el9_3.1.x86_64 1/2
Verifying : ntp-4.2.8p15-5.el9_3.1.x86_64 2/2

Installed:
ntp-4.2.8p15-5.el9_3.1.x86_64
ntpdate-4.2.8p15-5.el9_3.1.x86_64

Complete!

# 步骤2：停止chrony服务（如果已安装）
$ sudo systemctl stop chronyd
$ sudo systemctl disable chronyd

# 步骤3：启动ntp服务
$ sudo systemctl enable –now ntpd
Created symlink /etc/systemd/system/multi-user.target.wants/ntpd.service → /usr/lib/systemd/system/ntpd.service.

# 步骤4：查看ntp配置文件
$ cat /etc/ntp.conf
# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict ::1

# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.rhel.pool.ntp.org iburst
server 1.rhel.pool.ntp.org iburst
server 2.rhel.pool.ntp.org iburst
server 3.rhel.pool.ntp.org iburst

# Enable public key cryptography.
#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys

# Specify the key identifiers which are trusted.
#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.
#requestkey 8

# Specify the maximum allowed NTP packet size.
#controlkey 8

# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limit option.
disable monitor

# 步骤5：修改ntp配置
$ sudo vi /etc/ntp.conf
# 添加以下配置
server ntp1.aliyun.com iburst
server ntp2.aliyun.com iburst
server ntp3.aliyun.com iburst
server ntp4.aliyun.com iburst

# 步骤6：重启ntp服务
$ sudo systemctl restart ntpd

# 步骤7：查看ntp服务状态
$ sudo systemctl status ntpd
● ntpd.service – Network Time Service
Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2026-04-02 10:00:00 CST; 10s ago
Docs: man:ntpd(8)
Main PID: 1234 (ntpd)
Tasks: 2 (limit: 4915)
Memory: 2.3M
CGroup: /system.slice/ntpd.service
├─1234 /usr/sbin/ntpd -g
└─1235 /usr/sbin/ntpd -g

# 步骤8：查看ntp同步状态
$ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*ntp1.aliyun.com 10.0.0.1 2 u 2 64 377 1.234 0.123 0.456
+ntp2.aliyun.com 10.0.0.1 2 u 3 64 377 1.345 -0.234 0.567
+ntp3.aliyun.com 10.0.0.1 2 u 4 64 377 1.456 0.345 0.678
+ntp4.aliyun.com 10.0.0.1 2 u 5 64 377 1.567 -0.456 0.789

#!/bin/bash
# time_sync.sh
# from:www.itpux.com.qq113257174.wx:itpux-com
# web: http://www.fgedu.net.cn

# 服务器列表
SERVERS=(
“192.168.1.10”
“192.168.1.11”
“192.168.1.12”
)

# 设置时区
echo “Setting timezone to Asia/Shanghai”
for SERVER in “${SERVERS[@]}”; do
ssh root@${SERVER} “timedatectl set-timezone Asia/Shanghai”
ssh root@${SERVER} “timedatectl”
done

# 配置chrony
echo “Configuring chrony”
for SERVER in “${SERVERS[@]}”; do
ssh root@${SERVER} “cat > /etc/chrony.conf << 'EOF' # Use public servers from the pool.ntp.org project. pool 2.rhel.pool.ntp.org iburst # Record the rate at which the system clock gains/losses time. driftfile /var/lib/chrony/drift # Allow step adjustments only at the first update. makestep 1.0 3 # Enable kernel RTC synchronization. rtcsync # Specify the directory where log files will be written. logdir /var/log/chrony EOF" ssh root@${SERVER} "systemctl restart chronyd" ssh root@${SERVER} "systemctl enable chronyd" done # 验证时间同步 echo "Verifying time synchronization" for SERVER in "${SERVERS[@]}"; do echo "=== ${SERVER} ===" ssh root@${SERVER} "timedatectl" ssh root@${SERVER} "chronyc tracking" done # 执行脚本 $ chmod +x time_sync.sh $ ./time_sync.sh Setting timezone to Asia/Shanghai Local time: Wed 2026-04-02 10:00:00 CST Universal time: Wed 2026-04-02 02:00:00 UTC RTC time: Wed 2026-04-02 02:00:00 Time zone: Asia/Shanghai (CST, +0800) System clock synchronized: yes NTP service: active RTC in local TZ: no Configuring chrony Verifying time synchronization === 192.168.1.10 === Local time: Wed 2026-04-02 10:00:00 CST Universal time: Wed 2026-04-02 02:00:00 UTC RTC time: Wed 2026-04-02 02:00:00 Time zone: Asia/Shanghai (CST, +0800) System clock synchronized: yes NTP service: active RTC in local TZ: no Reference ID : 12345678 (2.rhel.pool.ntp.org) Stratum : 3 Ref time (UTC) : Wed Apr 2 02:00:00 2026 System time : 0.000000000 seconds fast of NTP time Last offset : +0.000123456 seconds RMS offset : 0.000234567 seconds Frequency : 12.345 ppm slow Residual freq : +0.123 ppm Skew : 0.456 ppm Root delay : 0.012345678 seconds Root dispersion : 0.023456789 seconds Update interval : 64.2 seconds Leap status : Normal

#!/bin/bash
# time_monitor.sh
# from:www.itpux.com.qq113257174.wx:itpux-com
# web: http://www.fgedu.net.cn

# 检查时间同步状态
echo “Checking time synchronization status”

# 检查NTP服务状态
if systemctl is-active –quiet chronyd; then
echo “OK: chronyd service is running”
else
echo “ERROR: chronyd service is not running”
exit 1
fi

# 检查时间同步状态
SYNC_STATUS=$(timedatectl | grep “System clock synchronized” | awk ‘{print $4}’)
if [ “$SYNC_STATUS” = “yes” ]; then
echo “OK: System clock is synchronized”
else
echo “WARNING: System clock is not synchronized”
fi

# 检查时间偏移
OFFSET=$(chronyc tracking | grep “Last offset” | awk ‘{print $4}’)
OFFSET_ABS=${OFFSET#-}
if (( $(echo “$OFFSET_ABS < 0.1" | bc -l) )); then echo "OK: Time offset is acceptable: $OFFSET" else echo "WARNING: Time offset is too large: $OFFSET" fi # 检查时间服务器连接 SOURCES=$(chronyc sources | grep "^*" | wc -l) if [ $SOURCES -gt 0 ]; then echo "OK: Connected to $SOURCES time server(s)" else echo "WARNING: Not connected to any time server" fi # 显示当前时间 echo "" echo "Current time: $(date)" echo "Timezone: $(timedatectl | grep 'Time zone' | awk '{print $3}')" # 执行脚本 $ chmod +x time_monitor.sh $ ./time_monitor.sh Checking time synchronization status OK: chronyd service is running OK: System clock is synchronized OK: Time offset is acceptable: +0.000123456 OK: Connected to 1 time server(s) Current time: Wed Apr 2 10:00:00 CST 2026 Timezone: Asia/Shanghai