时间同步

####时间同步####

1.服务端
yum install chrony -y ##安装服务

vim /etc/chrony.conf               ##主配置文件

21 # Allow NTP client access from local network.
22 allow 172.25.0.0/24       ##允许谁去同步我的时间

27 # Serve time even if not synchronized to any NTP server.
28 local stratum 10          ##不去同步任何人的时间，时间同步服务器级别

systemctl restart chronyd       ##重新加载chronyd文件
systemctl stop firewalld        ##停止火墙（服务端要关闭）

clock -w
clock -s

2.客户端

vim /etc/chrony.conf
  3 server 0.rhel.pool.ntp.org iburst
  4 server 1.rhel.pool.ntp.org iburst====> server ntpserverip iburst
  5 server 2.rhel.pool.ntp.org iburst====>
  6 server 3.rhel.pool.ntp.org iburst

“0.rhel.pool.ntp.org”里面改成服务端IP

systemctl restart chronyd

测试：

[root@localhost ~]# chronyc sources -v   在客户端上查看与服务器连接情况    

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
||                                                /   xxxx = adjusted offset,
||         Log2(Polling interval) -.             |    yyyy = measured offset,
||                                  \            |    zzzz = estimated error.
||                                   |           |                         
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* 172.25.0.11                  10   6   377    41   +170us[ +201us] +/-  191us

5.timedatectl命令

timedatectl     status          ##显示当前时间信息
                set-time        ##设定当前时间
                set-timezone        ##设定当前时区
                set-local-rtc 0|1   ##设定是否使用utc时间