chronyd時間服務器,和之前NTP的功能一樣,提供時間的,
基礎概念我就不說了,不擅長,chronyd是NTP之后誕生的,
最近下載了最新的Centos Linux 8.1,發現里面沒有ntp服務了,百度一搜發現改為了Chronyd,這篇文章就是部署一個服務器+客戶端測驗,
1、服務器端
Centos Linux 8.1 默認安裝了chronyd服務,我們只需要配置即可,
組態檔配置
紅色部分是需要服務器配置的,這是基本配置,主要在于實作基本功能,
vim /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.centos.pool.ntp.org iburst # 同步哪臺服務器上的時間 server 192.168.94.133 iburst # Record the rate at which the system clock gains/losses time. driftfile /var/lib/chrony/drift # Allow the system clock to be stepped in the first three updates # if its offset is larger than 1 second. makestep 1.0 3 # Enable kernel synchronization of the real-time clock (RTC). rtcsync # Allow NTP client access from local network. # allow 192.168.0.0/16 # 允許哪個網段的客戶端同步時間,133這臺是服務器, allow 192.168.94.0/24 # Serve time even if not synchronized to a time source. # 字面翻譯,提供時間即使沒有同步一個時間源, local stratum 10 # Specify file containing keys for NTP authentication. keyfile /etc/chrony.keys # Get TAI-UTC offset and leap seconds from the system tz database. leapsectz right/UTC
啟動chronyd,并設定開機自啟
[root@filesystem ~]# systemctl start chronyd [root@filesystem ~]# systemctl enable chronyd
查看時間同步情況,本地能夠同步才能夠讓其他節點進行同步
timedatectl是一個時間配置工具,用于設定時間、與時間相關的配置等,
[root@filesystem ~]# timedatectl
Local time: 五 2020-05-29 11:17:46 EDT
Universal time: 五 2020-05-29 15:17:46 UTC
RTC time: 五 2020-05-29 15:17:46
Time zone: America/New_York (EDT, -0400)
# 當此值為yes代表同步成功,如果為no就代表未同步,或同步失敗,
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@filesystem ~]#查看當前時間是從哪里同步過來的,這里顯示的是主機名,不影響,
[root@filesystem ~]# chronyc sources 210 Number of sources = 1 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^* filesystem 10 7 377 537 +11us[ +25us] +/- 30us [root@filesystem ~]#
防火墻配置
防火墻要能放行此服務,關閉防火墻或是放行相應的埠及服務,
關閉防火墻,并設定開機不啟動
[root@filesystem ~]# systemctl stop firewalld [root@filesystem ~]# systemctl disable firewalld Removed /etc/systemd/system/multi-user.target.wants/firewalld.service. Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service. [root@filesystem ~]#設定防火墻放行規則
[root@filesystem ~]# netstat -antup | grep chrony udp 0 0 127.0.0.1:323 0.0.0.0:* 35191/chronyd udp 0 0 0.0.0.0:123 0.0.0.0:* 35191/chronyd udp6 0 0 ::1:323 :::* 35191/chronyd [root@filesystem ~]# # 只有upd 123埠 [root@filesystem ~]# firewall-cmd --permanent --add-port=123/udp success [root@filesystem ~]# firewall-cmd --reload success [root@filesystem ~]#
2、客戶端配置
組態檔配置
vim /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.centos.pool.ntp.org iburst server 192.168.94.133 iburst
配置開機自啟
[root@node1 ~]# systemctl restart chronyd [root@node1 ~]# systemctl enable chronyd [root@node1 ~]#
查看同步狀態及資訊
[root@node1 ~]# timedatectl
Local time: 五 2020-05-29 11:28:12 EDT
Universal time: 五 2020-05-29 15:28:12 UTC
RTC time: 五 2020-05-29 15:28:12
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@node1 ~]# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* filesystem 11 6 17 34 -520ns[+7955ns] +/- 15ms
[root@node1 ~]#我們看到是yes,但是如何判斷它是原來的時間還是同步好了,畢竟很多系統不同步時間也是近似的,
3、設定時間
我們對chronyd服務器端進行時間修改,
這里說明一點,時間的修改只能在時間不進行同步的狀態下進行,也就是說,如果時間是同步中的,是不允許修改時間的,對時間進行保護,
[root@filesystem ~]# timedatectl
Local time: 五 2020-05-29 11:30:40 EDT
Universal time: 五 2020-05-29 15:30:40 UTC
RTC time: 五 2020-05-29 15:30:40
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@filesystem ~]#我們測驗效果,關掉ntp,修改時間
timedatectl set-ntp 0
[root@filesystem ~]# timedatectl set-ntp 0
[root@filesystem ~]# timedatectl set-time "2020-06-01 01:01:01"
[root@filesystem ~]# timedatectl set-ntp 1
[root@filesystem ~]# systemctl restart chronyd
[root@filesystem ~]# timedatectl
Local time: 一 2020-06-01 01:01:20 EDT
Universal time: 一 2020-06-01 05:01:20 UTC
RTC time: 一 2020-06-01 05:01:20
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@filesystem ~]#客戶端查看時間
[root@node1 ~]# systemctl restart chronyd
[root@node1 ~]#
[root@node1 ~]# timedatectl
Local time: 一 2020-06-01 01:01:55 EDT
Universal time: 一 2020-06-01 05:01:55 UTC
RTC time: 五 2020-05-29 15:46:52
Time zone: America/New_York (EDT, -0400)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
[root@node1 ~]#
客戶端不重啟服務也是能同步的,如果你下去做實驗的話,可以測驗下,
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