Centos 集群时间同步chrony

青旅半醒 2023-02-21 06:29 3阅读 0赞

## 实验环境 ##

系统          角色        IP
    Centos7.6    Server    192.168.14.217
    Centos7.6    Client    192.168.14.218

## 一、Server端配置 ##

1、Centos7系统已经默认安装chrony服务，没有再执行以下命令

[root@server ~]# yum install -y chrony

2、启动服务

[root@server ~]# systemctl start chronyd
    [root@server ~]# systemctl enable chronyd

3、修改配置文件

[root@server ~]# vi /etc/chrony.conf

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70][]

4、查看时间同步源（^\*表示已经同步）

[root@server ~]# chronyc sources -v
    210 Number of sources = 4
    
      .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
     / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
    | /   '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
    ||                                                 .- 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               
    ===============================================================================
    ^- sv1.ggsrv.de                  2   6   327    88    +26ms[  +26ms] +/-  131ms
    ^- ntp8.flashdance.cx            2   6   377    18  +3759us[+3759us] +/-  152ms
    ^- 119.28.183.184                2   6   317    26   -653us[ -653us] +/-   49ms
    ^* 120.25.115.20                 2   6   377    89    +50us[ +119us] +/- 4323us

## 二、Clinet端配置 ##

1、修改配置文件

[root@client ~]# cat /etc/chrony.conf |grep -v "^$"|grep -v "^#"
    server server iburst
    driftfile /var/lib/chrony/drift
    makestep 1.0 3
    rtcsync
    logdir /var/log/chrony

注释默认的server地址，添加本地时间同步地址

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 1][]

2、修改主机名解析

#底部添加一条记录
    [root@client ~]# vi /etc/hosts
    192.168.14.217 server

3、重启服务

[root@client ~]# systemctl restart chronyd

4、查看时间是否同步

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 2][]

5、就算chronyc sources -v显示^\*，但是如果NTP显示no也是不会同步时间的。（解决方法是重启服务）

![20200629134027929.png][]

6、模拟时间不同步，随意修改一个时间

[root@client ~]# date -s "2020-06-29 08:00:00"

7、查看时间同步状态（^?没同步，NTP状态为no）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 3][]

8、NTP状态为不会自动变为yes，需要重启服务

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 4][]

9、因此可以编辑脚本，添加到自动任务

#当检测NTP synchronized状态为no的时候，自动执行重启服务
    [root@client ~]# vi time.sh 
    #!/bin/bash
    status=`timedatectl | grep "NTP synchronized" | awk -F' ' '{print $3}'`
    if [ "$status" =  "no" ]; then
     systemctl restart  chronyd
    fi
    
    #添加到自动任务，一分钟执行一次
    [root@client ~]# crontab -e
    */1 * * * * /root/time.sh
    
    #查看日志
    [root@client ~]# tail -f /var/log/cron

10、再次查看时间同步状态，至此完成

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RsYWRhZ2lv_size_16_color_FFFFFF_t_70 5][]

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[20200629134027929.png]: https://img-blog.csdnimg.cn/20200629134027929.png
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