Linux服務器時間同步配置
阿新 • • 發佈：2018-06-07
時間同步 時間服務器以CentOS7 做時間服務器，其他服務器（Centos 6、RHEL7）同步該服務器時間
RHEL 7、CentOS 7 默認的網絡時間協議 為Chrony
本教程時間服務器服務端主機名：CentOS7-Node3 IP：192.168.231.130
客戶端1主機名：RHEL7-Node1
客戶端2主機名：CentOS6-Node2
服務端：
先查詢下chrony服務狀態
[root@CentOS7-Node3 ~]# systemctl status chronyd Unit chronyd.service could not be found.
如果查詢沒有該服務，可yum安裝
[root@CentOS7-Node3 ~]# yum install -y chrony Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 extras | 3.4 kB 00:00:00 updates | 3.4 kB 00:00:00 Loading mirror speeds from cached hostfile --------------------------------------------------------------省略部分過程----------------------------------------------------------------------- Running transaction Installing : chrony-3.2-2.el7.x86_64 1/1 Verifying : chrony-3.2-2.el7.x86_64 1/1 Installed: chrony.x86_64 0:3.2-2.el7 Complete!
啟動chrony服務
[root@CentOS7-Node3 ~]# systemctl start chronyd
查詢狀態
[root@CentOS7-Node3 ~]# systemctl status chronyd
● chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2018-06-07 10:20:28 CST; 2s ago
Docs: man:chronyd(8)
man:chrony.conf(5)
Process: 6031 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exited, status=0/SUCCESS)
Process: 6027 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 6029 (chronyd)
CGroup: /system.slice/chronyd.service
└─6029 /usr/sbin/chronyd
Jun 07 10:20:28 CentOS7-Node3 systemd[1]: Starting NTP client/server...
Jun 07 10:20:28 CentOS7-Node3 chronyd[6029]: chronyd version 3.2 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +...DEBUG)
Jun 07 10:20:28 CentOS7-Node3 chronyd[6029]: Initial frequency -29.914 ppm
Jun 07 10:20:28 CentOS7-Node3 systemd[1]: Started NTP client/server.
Jun 07 10:20:33 CentOS7-Node3 chronyd[6029]: Selected source 37.218.240.198
Jun 07 10:20:33 CentOS7-Node3 chronyd[6029]: System clock wrong by -3.020089 seconds, adjustment started
Jun 07 10:20:30 CentOS7-Node3 chronyd[6029]: System clock was stepped by -3.020089 seconds
Hint: Some lines were ellipsized, use -l to show in full.作為時間服務器做如下配置：
[root@CentOS7-Node3 ~]# vim /etc/chrony.conf 25 # Allow NTP client access from local network. 26 allow 192.168.231.0/24 27 28 # Serve time even if not synchronized to a time source. 29 local stratum 10
三臺服務器時間，CentOS7-Node3為正常時間
客戶端配置：
客戶端1：
將 server 0.rhel.pool.ntp.org iburst ---server 3.rhel.pool.ntp.org iburst 刪除或註釋
新增\修改配置：
server 192.168.231.130 iburt
allow 192.168.231.0/24
[root@RHEL7-Node1 ~]# vim /etc/chrony.conf 1 # Use public servers from the pool.ntp.org project. 2 # Please consider joining the pool (http://www.pool.ntp.org/join.html). 3 #server 0.rhel.pool.ntp.org iburst 4 #server 1.rhel.pool.ntp.org iburst 5 #server 2.rhel.pool.ntp.org iburst 6 #server 3.rhel.pool.ntp.org iburst 7 server 192.168.231.130 iburst 8 # Ignore stratum in source selection. 9 stratumweight 0 10 11 # Record the rate at which the system clock gains/losses time. 12 driftfile /var/lib/chrony/drift 13 14 # Enable kernel RTC synchronization. 15 rtcsync 16 17 # In first three updates step the system clock instead of slew 18 # if the adjustment is larger than 10 seconds. 19 makestep 10 3 20 21 # Allow NTP client access from local network. 22 allow 192.168.231.0/24
修改完成後，保存，重啟chrony服務即可生效
[root@RHEL7-Node1 ~]# systemctl restart chronyd
客戶端2 CentOS6-Node2
CentOS 6 為NTP
執行 ntpdate 192.168.231.130
[root@CentOS6-Node2 ~]# ntpdate 192.168.231.130 7 Jun 16:59:34 ntpdate[1563]: the NTP socket is in use, exiting
若出現上述錯誤，將ntp服務停止，再執行ntpdate 192.168.231.130
[root@CentOS6-Node2 ~]# service ntpd stop Shutting down ntpd: [ OK ] [root@CentOS6-Node2 ~]# ntpdate 192.168.231.130 7 Jun 17:00:19 ntpdate[1578]: step time server 192.168.231.130 offset -13589998.9 54539 sec[root@CentOS6-Node2 ~]# service ntpd status ntpd is stopped [root@CentOS6-Node2 ~]# date Thu Jun 7 17:00:37 CST 2018
隨後在計劃任務中添加時間同步
[root@CentOS6-Node2 ~]# crontab -e 0-59/10 * * * * /usr/sbin/ntpdate 192.168.231.130
10分鐘同步一次
現在查看下三臺服務器時間是一致的了
Linux服務器時間同步配置