Chrony时间同步

NTP(Network Time Protocol,网络时间协议)是用来使网络中的各个计算机时间同步的一种协议.它的用于是把计算机的时钟同步到世界协调时UTC,其精度在局域网内可达0.1ms,在网络网上绝大多数的地方其精度可以达到1-50ms.

1.chrony服务部署

//查看一下由哪个包提供的

[root@ntp-server ~]# yum provides chronyd

Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

chrony-3.1-2.el7.x86_64 : An NTP client/server

Repo        : dvd

Matched from:

Filename    : /usr/sbin/chronyd

//安装chrony服务

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

Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

dvd                                                                | 4.1 kB  00:00:00

Resolving Dependencies

--> Running transaction check

---> Package chrony.x86_64 0:3.1-2.el7 will be installed

--> Processing Dependency: libseccomp.so.2()(64bit) for package: chrony-3.1-2.el7.x86_64

--> Running transaction check

---> Package libseccomp.x86_64 0:2.3.1-3.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

==========================================================================================

 Package                Arch               Version                  Repository       Size

==========================================================================================

Installing:

 chrony                 x86_64             3.1-2.el7                dvd             237 k

Installing for dependencies:

 libseccomp             x86_64             2.3.1-3.el7              dvd              56 k

Transaction Summary

==========================================================================================

Install  1 Package (+1 Dependent package)

Total download size: 293 k

Installed size: 761 k

Is this ok [y/d/N]: y

Downloading packages:

------------------------------------------------------------------------------------------

Total                                                     1.6 MB/s | 293 kB  00:00:00

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  Installing : libseccomp-2.3.1-3.el7.x86_64                                          1/2

  Installing : chrony-3.1-2.el7.x86_64                                                2/2

  Verifying  : chrony-3.1-2.el7.x86_64                                                1/2

  Verifying  : libseccomp-2.3.1-3.el7.x86_64                                          2/2 

Installed:

  chrony.x86_64 0:3.1-2.el7                                                               

Dependency Installed:

  libseccomp.x86_64 0:2.3.1-3.el7                                                         

Complete!

//启动服务

[root@ntp-server ~]# systemctl start chrony

chrony-dnssrv@       chronyd.service      chrony-wait.service

[root@ntp-server ~]# systemctl start chronyd

chrony服务相关命令

参数	解释
list-timezones	列出可用时区信息
set-timezone	设置时区
set-ntp	启用NTP
status	查看状态

[root@ntp-server ~]# timedatectl

      Local time: Tue 2018-08-21 14:02:35 CST

  Universal time: Tue 2018-08-21 06:02:35 UTC

        RTC time: Tue 2018-08-21 06:02:33

       Time zone: Asia/Shanghai (CST, +0800)

     NTP enabled: n/a

NTP synchronized: no

 RTC in local TZ: no

      DST active: n/a

[root@ntp-server ~]# timedatectl

list-timezones  set-ntp         set-timezone

set-local-rtc   set-time        status

[root@ntp-server ~]# timedatectl list-timezones | grep -i shanghai

Asia/Shanghai

//关闭NTP

[root@ntp-server ~]# timedatectl set-ntp false

[root@ntp-server ~]# timedatectl

      Local time: Tue 2018-08-21 14:15:36 CST

  Universal time: Tue 2018-08-21 06:15:36 UTC

        RTC time: Tue 2018-08-21 06:15:36

       Time zone: Asia/Shanghai (CST, +0800)

     NTP enabled: no

NTP synchronized: yes

 RTC in local TZ: no

      DST active: n/a

//启用NTP

[root@ntp-server ~]# timedatectl set-ntp true

[root@ntp-server ~]# timedatectl

      Local time: Tue 2018-08-21 14:16:02 CST

  Universal time: Tue 2018-08-21 06:16:02 UTC

        RTC time: Tue 2018-08-21 06:16:02

       Time zone: Asia/Shanghai (CST, +0800)

     NTP enabled: yes

NTP synchronized: no

 RTC in local TZ: no

      DST active: n/a

//查看一下ntpdate由哪个包提供的

[root@ntp-server ~]# yum provides ntpdate

Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

ntpdate-4.2.6p5-25.el7_3.2.x86_64 : Utility to set the date and time via NTP

Repo        : dvd

//如果没有请安装ntpdate

[root@ntp-server ~]# yum install ntpdate.x86_64

Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Resolving Dependencies

--> Running transaction check

---> Package ntpdate.x86_64 0:4.2.6p5-25.el7_3.2 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

==========================================================================================

 Package            Arch              Version                        Repository      Size

==========================================================================================

Installing:

 ntpdate            x86_64            4.2.6p5-25.el7_3.2             dvd             86 k

Transaction Summary

==========================================================================================

Install  1 Package

Total download size: 86 k

Installed size: 121 k

Is this ok [y/d/N]: y

Downloading packages:

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  Installing : ntpdate-4.2.6p5-25.el7_3.2.x86_64                                      1/1

  Verifying  : ntpdate-4.2.6p5-25.el7_3.2.x86_64                                      1/1 

Installed:

  ntpdate.x86_64 0:4.2.6p5-25.el7_3.2                                                     

Complete!

2.配置时间同步服务器

[root@ntp-server ~]# vim /etc/chrony.conf

server ntp1.aliyun.com iburst

server ntp2.aliyun.com iburst

server ntp3.aliyun.com iburst

server ntp4.aliyun.com iburst

server ntp5.aliyun.com iburst

server ntp6.aliyun.com iburst

server ntp7.aliyun.com iburst

allow 172.16.10.0/24

//验证服务端是否能同步时间

[root@ntp-server ~]# chronyc sources -v

210 Number of sources = 1

  .-- 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

===============================================================================

^* 120.25.115.20                 2   6    17    22   -117us[ -948us] +/-   24ms

//看一下服务器时间

[root@ntp-server ~]# date

Tue Aug 21 15:31:29 CST 2018

//看一下客户端时间 时间不对需要同步

[root@ntp-client ~]# date

Fri Aug 20 14:10:28 CST 2010

//ntp服务器地址

ens35: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 172.16.10.20  netmask 255.255.255.0  broadcast 172.16.10.255

        inet6 fe80::da6c:394e:1ef7:c236  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:6e:66:65  txqueuelen 1000  (Ethernet)

        RX packets 6  bytes 480 (480.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 21  bytes 1614 (1.5 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

//客户端同步,时间已经同步正确

[root@ntp-client ~]# ntpdate 172.16.10.20

21 Aug 15:35:10 ntpdate[2421]: step time server 172.16.10.20 offset 252552056.617240 sec

You have new mail in /var/spool/mail/root

[root@ntp-client ~]# date

Tue Aug 21 15:35:15 CST 2018

//第一种方式设置定时任务

[root@ntp-client ~]# which ntpdate

/usr/sbin/ntpdate

[root@ntp-client ~]# crontab -e

*/2 * * * * /usr/sbin/ntpdate 172.16.10.20 &>/dev/null

//第二种方式客户端编辑配置文件服务器指向172.168.10.20

[root@ntp-client ~]# vim /etc/chrony.conf

server 172.16.10.20 iburst

//启动服务查看服务运行状态

[root@ntp-client ~]# systemctl restart chronyd

[root@ntp-client ~]# systemctl status chronyd

● chronyd.service - NTP client/server

   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)

   Active: active (running) since Tue 2018-08-21 15:52:11 CST; 6s ago

     Docs: man:chronyd(8)

           man:chrony.conf(5)

  Process: 3012 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exited, status=0/SUCCESS)

  Process: 3009 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCCESS)

 Main PID: 3011 (chronyd)

    Tasks: 1

   CGroup: /system.slice/chronyd.service

           └─3011 /usr/sbin/chronyd

Aug 21 15:52:10 ntp-client systemd[1]: Starting NTP client/server...

Aug 21 15:52:11 ntp-client chronyd[3011]: chronyd version 3.2 starting (+CMDMON +NTP ...G)

Aug 21 15:52:11 ntp-client chronyd[3011]: Frequency -37.840 +/- 1000000.000 ppm read ...ft

Aug 21 15:52:11 ntp-client systemd[1]: Started NTP client/server.

Aug 21 15:52:15 ntp-client chronyd[3011]: Selected source 172.16.10.20

Hint: Some lines were ellipsized, use -l to show in full.

//差不多一分钟同步了

[root@ntp-client ~]# date

Tue Aug 10 08:32:32 CST 2010

[root@ntp-client ~]# date

Tue Aug 10 08:32:33 CST 2010

[root@ntp-client ~]# date

Tue Aug 21 16:04:24 CST 2018

[root@ntp-client ~]# date

Tue Aug 21 16:04:25 CST 2018

Linux基础学习-chrony时间同步服务的更多相关文章

Linux基础学习-使用iSCSI服务部署网络存储
使用iSCSI服务部署网络存储 iSCSI技术实现了物理硬盘设备与TCP/IP网络协议的相互结合,使得用户可以通过互联网方便地访问远程机房提供的共享存储资源.下面介绍如何在Linux上部署iSCSI服 ...
Linux基础学习-Samba文件共享服务
使用Samba文件共享服务 Samba起源: 早期网络想要在不同主机之间共享文件大多要用FTP协议来传输,但FTP协议仅能做到传输文件却不能直接修改对方主机的资料数据,这样确实不太方便,于是便出现了N ...
Linux基础学习-使用vsftpd服务传输文件
使用vsftpd服务传输文件 1 安装vsftpd [root@qdlinux ~]# yum install vsftpd Loaded plugins: product-id, search-di ...
Linux基础学习系列目录导航
Linux基础学习-通过VM安装RHEL7.4 Linux基础学习-命令行与图形界面切换 Linux基础学习-基本命令 Linux基础学习-RHEL7.4之YUM更换CentOS源 Linux基础学习 ...
Linux 基础学习2
目录 Linux 基础学习2 文件目录结构文件命名规范文件系统结构 linux应用程序的组成绝对路径和相对路径目录名和基名切换目录切换到家目录切换到上一次的目录显示当前的工作目录列出 ...
chrony时间同步服务端客户端安装配置
chrony时间同步服务端客户端安装配置原创内容http://www.cnblogs.com/elvi/p/7658021.html #!/bin/sh #运行环境 centos7 #chro ...
linux基础学习之软件安装以及常用命令
linux基础学习之软件安装以及常用命令调用中央仓库: yum install wget 然后下载nodejs: wget https://nodejs.org/dist/v10.14.2/node ...
linux基础学习路线&review
linux基础学习网址: https://www.runoob.com/linux/linux-tutorial.html 比较重点的是这个启动过程的介绍学习:https://www.runoob.c ...
Linux 基础学习1
目录 Linux 基础学习用户登录终端交互式接口 bash 修改ssh连接慢的步骤命令提示符显示提示符格式命令别名命令格式获取命令的帮助信息 man bash 快捷键 tab 键引 ...

随机推荐

day04 异常
IP服务-4-HSRP，VRRP和GLBP
HSRP(热备份路由器协议).VRRP(虚拟路由器冗余协议)和GLBP(网关负载均衡协议) 当主机只知道一个IP地址能够用来访问子网外部时,可能会出现一些问题,这些协议正好解决了这一隐患. HSRP允 ...
python 对mongdb的简单操作
准备工作:1.选择安装合适的mongodb到本地电脑,2.创建mongodb实例,3,开启mongodb实例,4,下载pymongo第三方库,5.下载pycharm对mongodb可视化支持的插件mo ...
CentOS 部署RabbitMQ集群
1. 准备两台CentOS,信息如下: node1:10.0.0.123 node2:10.0.0.124 修改hostname请参照: $ hostname # 查看当前的hostname $ ho ...
morhpia(4)-更新
更新由2部分组成:一个查询和一组更新操作符.本例是跟所有薪水小于等于2000的员工涨工资500. @Test public void update() throws Exception { //第一步 ...
hibernate Day2 案例代码
1.编写实体类Person package com.icss.pojo; public class Person { private int uid; private String uname; pr ...
elasticsearch的模糊查询
https://blog.csdn.net/a772304419/article/details/78951561
PM2常用命令
安装pm2 npm install -g pm2 1.启动 pm2 start app.js pm2 start app.js --name my-api #my-api为PM2进程名称 pm2 ...
Bluefish
Bluefish标榜其自身是“一款为熟练的Web设计员和程序员而设的编辑器,但它的UI却很直观,任何初学者都能够很快上手,并在不断地积累中发现和掌握它的其它功能. Bluefish标榜其自身是“一 ...
jasmine+karma 自动化单元测试
测试的必须性相信大家都知道测试的必要性,测试先行的概念.不过,写了这么多年的代码,除了之前用java的时候写过一些测试用例,还真的很少写过前端的测试用例,或者做一些自动化测试.感觉做单元测试还是很有 ...

Linux基础学习-chrony时间同步服务

Chrony时间同步

1.chrony服务部署

chrony服务相关命令

2.配置时间同步服务器

Linux基础学习-chrony时间同步服务的更多相关文章

随机推荐

热门专题