标签:时间同步 时间服务器
以CentOS7 做时间服务器,其他服务器(Centos 6、RHEL7)同步该服务器时间RHEL 7、CentOS 7 默认的网络时间协议 为Chrony
本教程时间服务器服务端主机名:CentOS7-Node3 IP:192.168.231.130
客户端1主机名:RHEL7-Node1
客户端2主机名:CentOS6-Node2
服务端:
先查询下chrony服务状态
[root@CentOS7-Node3 ~]# systemctl status chronyd Unit chronyd.service could not be found.
如果查询没有该服务,可yum安装
[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 --------------------------------------------------------------省略部分过程----------------------------------------------------------------------- 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!
启动chrony服务
[root@CentOS7-Node3 ~]# systemctl start chronyd
查询状态
[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.
作为时间服务器做如下配置:
[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
三台服务器时间,CentOS7-Node3为正常时间
客户端配置:
客户端1:
将 server 0.rhel.pool.ntp.org iburst ---server 3.rhel.pool.ntp.org iburst 删除或注释
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
修改完成后,保存,重启chrony服务即可生效
[root@RHEL7-Node1 ~]# systemctl restart chronyd
客户端2 CentOS6-Node2
CentOS 6 为NTP
执行 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
若出现上述错误,将ntp服务停止,再执行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
随后在计划任务中添加时间同步
[root@CentOS6-Node2 ~]# crontab -e 0-59/10 * * * * /usr/sbin/ntpdate 192.168.231.130
10分钟同步一次
现在查看下三台服务器时间是一致的了
标签:时间同步 时间服务器
原文地址:http://blog.51cto.com/rhelanker/2126054