一、同步阿里云服务器时间
服务端设置
1.检查chrony服务是否安装,设置chrony开机自启,查看chrony服务状态
- [root@node1-server ~]# rpm -q chrony # rpm -q 用于查看包是否安装
- chrony-4.3-1.el9.x86_64
- [root@node1-server ~]# systemctl enable --now chronyd # 设置服务开机自启
- [root@node1-server ~]# systemctl status chronyd # 查看chronyd服务状态
- ● chronyd.service - NTP client/server
- Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; preset: enabled)
- Active: active (running) since Tue 2025-03-25 14:11:34 CST; 2h 22min ago
- Docs: man:chronyd(8)
- man:chrony.conf(5)
- Main PID: 905 (chronyd)
- Tasks: 1 (limit: 10681)
- Memory: 4.0M
- CPU: 80ms
- CGroup: /system.slice/chronyd.service
- └─905 /usr/sbin/chronyd -F 2
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2.关闭防火墙,SELinux设置为宽容模式,查看防火墙状态
- [root@node1-server ~]# systemctl stop firewalld && systemctl disable firewalld # 关闭防火墙服务,关闭成功后禁用服务
- Removed "/etc/systemd/system/multi-user.target.wants/firewalld.service".
- Removed "/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service".
- [root@node1-server ~]# setenforce 0 # SELinux 调整为宽容模式
- [root@node1-server ~]# getenforce # 查看 SELinux 状态
- Permissive # 宽容模式
- [root@node1-server ~]# systemctl status firewalld.service # 查看防火墙状态
- ○ firewalld.service - firewalld - dynamic firewall daemon
- Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; preset: enabled)
- Active: inactive (dead)
- Docs: man:firewalld(1)
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3.编辑服务端/etc/chrony.conf文件
- [root@node1-server ~]# vim /etc/chrony.conf
- 3 #pool 2.rhel.pool.ntp.org iburst # 注释此行
- 4 pool ntp.aliyun.com iburst # pool 是一个关键字,作用是指定一组 NTP 服务器,iburst表示的是首次同步的时候快速同步
- 27 #allow 192.168.0.0/16 # 注释此行
- 28 allow 192.168.11.0/24 # 允许同步该网段
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4.重启服务,查看服务,查看日期
- [root@node1-server ~]# systemctl restart chronyd # 重启服务
- [root@node1-server ~]# chronyc sources -v # 查看服务
- .-- Source mode '^' = server, '=' = peer, '#' = local clock.
- / .- Source state '*' = current best, '+' = combined, '-' = not combined,
- | / 'x' = may be in error, '~' = too variable, '?' = unusable.
- || .- xxxx [ yyyy ] +/- zzzz
- || Reachability register (octal) -. | xxxx = adjusted offset,
- || Log2(Polling interval) --. | | yyyy = measured offset,
- || \ | | zzzz = estimated error.
- || | | \
- MS Name/IP address Stratum Poll Reach LastRx Last sample
- =========================================================================
- ^* 203.107.6.88 2 6 17 25 +20ms[ +30ms] +/- 72ms
- [root@node1-server ~]# date # 查看日期
- Tue Mar 25 04:54:42 PM CST 2025 # 与阿里云服务器同步成功
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客户端设置
1.关闭防火墙并查看防火墙状态
- [root@node2-client ~]# systemctl stop firewalld.service && systemctl disable firewalld.service #关闭防火墙
- Removed "/etc/systemd/system/multi-user.target.wants/firewalld.service".
- Removed "/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service".
- [root@node2-client ~]# systemctl status firewalld.service #查看防火墙状态
- ○ firewalld.service - firewalld - dynamic firewall daemon
- Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; preset: enabled)
- Active: inactive (dead)
- Docs: man:firewalld(1)
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2.编辑客户端配置文件
- [root@node2-client ~]# vim /etc/chrony.conf
- 3 #pool 2.rhel.pool.ntp.org iburst
- 4 pool 192.168.11.135 iburst # 以192.168.11.135为时间服务器
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3.客户端重启服务,查看服务,查看日期
- [root@node2-client ~]# systemctl restart chronyd # 重启服务
- [root@node2-client ~]# chronyc sources -v # 查看服务
- .-- Source mode '^' = server, '=' = peer, '#' = local clock.
- / .- Source state '*' = current best, '+' = combined, '-' = not combined,
- | / 'x' = may be in error, '~' = too variable, '?' = unusable.
- || .- xxxx [ yyyy ] +/- zzzz
- || Reachability register (octal) -. | xxxx = adjusted offset,
- || Log2(Polling interval) --. | | yyyy = measured offset,
- || \ | | zzzz = estimated error.
- || | | \
- MS Name/IP address Stratum Poll Reach LastRx Last sample
- =========================================================================
- ^* 192.168.11.135 3 6 17 8 +30us[ +80us] +/- 54ms
- [root@node2-client ~]# date # 查看日期
- Tue Mar 25 04:59:27 PM CST 2025 #与服务端同步成功
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二、同步本地服务器时间
服务端配置
1.修改服务端配置文件
- [root@node1-server ~]# vim /etc/chrony.conf
- 30 # Serve time even if not synchronized to a time source.
- 31 local stratum 10 # 把本地系统设置为一个 NTP 时间源,并且将其 Stratum 层级设定为 10
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2.修改 /etc/resolv.conf 文件,不使用dns解析,模拟无法上网的情况
- [root@node1-server ~]# vim /etc/resolv.conf
- # Generated by NetworkManager
- #nameserver 223.5.5.5 # 注释此行
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3.修改错误时间
- [root@node1-server ~]# date -s '2021-12-13 14:54:58' # 修改时间是为了让结果更明显
- Mon Dec 13 02:54:58 PM CST 2021
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4.重启服务,查看服务,查看日期
- [root@node1-server ~]# systemctl restart chronyd
- [root@node1-server ~]# chronyc sources -v
- .-- Source mode '^' = server, '=' = peer, '#' = local clock.
- / .- Source state '*' = current best, '+' = combined, '-' = not combined,
- | / 'x' = may be in error, '~' = too variable, '?' = unusable.
- || .- xxxx [ yyyy ] +/- zzzz
- || Reachability register (octal) -. | xxxx = adjusted offset,
- || Log2(Polling interval) --. | | yyyy = measured offset,
- || \ | | zzzz = estimated error.
- || | | \
- MS Name/IP address Stratum Poll Reach LastRx Last sample
- =========================================================================
- [root@node1-server ~]# # 此处能看到没有时间服务器与本机同步
- [root@node1-server ~]# date
- Mon Dec 13 02:56:42 PM CST 2021
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客户端配置 仅需客户端重启服务,查看服务,查看日期- [root@node2-client ~]# systemctl restart chronyd
- [root@node2-client ~]# chronyc sources -v
- .-- Source mode '^' = server, '=' = peer, '#' = local clock.
- / .- Source state '*' = current best, '+' = combined, '-' = not combined,
- | / 'x' = may be in error, '~' = too variable, '?' = unusable.
- || .- xxxx [ yyyy ] +/- zzzz
- || Reachability register (octal) -. | xxxx = adjusted offset,
- || Log2(Polling interval) --. | | yyyy = measured offset,
- || \ | | zzzz = estimated error.
- || | | \
- MS Name/IP address Stratum Poll Reach LastRx Last sample
- =========================================================================
- ^* 192.168.11.135 10 6 17 8 +7530ns[+8920ns] +/- 150us
- [root@node2-client ~]# date
- Mon Dec 13 02:58:41 PM CST 2021 # 时间与服务端同步成功
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