特殊云服务,可能只有DMZ区域服务器可以访问特定的互联网地址,而应用服务器和数据库服务器不能访问互联网的。同步时间可以开通访问DMZ时间服务器.
本文依这篇为例:详细教程 Centos8.5 基于 k8s v1.30.1 部署高可用集群 kubeadm 安装 kubernetes v1.30.1 docker集群搭建 延长证书有效期-CSDN博客
常见网络架构:
1 CentOS 8 默认使用的时间同步服务是 chronyd ,能够保持系统时间的同步更准确。
#master11如果没有安装,执行
yum install chrony
#vim /etc/chrony.conf
pool 2.centos.pool.ntp.org iburst --> #pool 2.centos.pool.ntp.org iburst
#allow 192.168.0.0/16 --> allow 192.168.50.0/24
server ntp5.aliyun.com iburst
server ntp6.aliyun.com iburst
server ntp7.aliyun.com iburst
server time1.tencentyun.com iburst
server time2.tencentyun.com iburst
server time3.tencentyun.com iburst
#启动配置
systemctl enable chronyd
systemctl start chronyd
#查看
systemctl status chronyd
#查看同步
root@master11 ~]# chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 203.107.6.88 2 6 177 7 +4846us[+7827us] +/- 23ms
[root@master11 ~]# timedatectl status
Local time: Sat 2024-05-18 22:12:08 CST
Universal time: Sat 2024-05-18 14:12:08 UTC
RTC time: Sat 2024-05-18 14:12:07
Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
2 节点配置
[root@slave12 ~]# vim /etc/chrony.conf
pool 2.centos.pool.ntp.org iburst -->#pool 2.centos.pool.ntp.org iburst
server 192.168.50.11 iburst
#查看同步
[root@slave12 ~]# chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* master11 3 6 37 63 +1257ns[+3073us] +/- 23ms
[root@slave12 ~]# chronyc sourcestats -v
.- Number of sample points in measurement set.
/ .- Number of residual runs with same sign.
| / .- Length of measurement set (time).
| | / .- Est. clock freq error (ppm).
| | | / .- Est. error in freq.
| | | | / .- Est. offset.
| | | | | | On the -.
| | | | | | samples. \
| | | | | | |
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
master11 6 3 136 -4.415 52.325 -16ns 568us
[root@slave13 ~]# vim /etc/chrony.conf
pool 2.centos.pool.ntp.org iburst -->#pool 2.centos.pool.ntp.org iburst
server 192.168.50.11 iburst
[root@slave13 ~]# chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* master11 3 6 17 4 -17us[ -21us] +/- 24ms
3 chronyc 可配置