Linux時間同步

                  ####時間同步####

1.服務端

yum install chrony -y   ##安裝服務

vim /etc/chrony.conf    ##主配置檔案

21 # Allow NTP client access from local network.

22 allow 172.25.0.0/24  ##允許誰去同步我的時間

27 # Serve time even if not synchronized to any NTP server.

28 local stratum 10 ##不去同步任何人的時間，時間同步伺服器級别

systemctl restart chronyd

systemctl stop firewalld

2.用戶端

vim /etc/chrony.conf

  3 server 0.rhel.pool.ntp.orgiburst

  4 server 1.rhel.pool.ntp.orgiburst====> server ntpserverip iburst

  5 server 2.rhel.pool.ntp.org iburst====>

  6 server 3.rhel.pool.ntp.orgiburst

測試：

[root@localhost ~]# chronyc sources -v

210 Number of sources = 1

  .-- Source mode  '^' = server, '=' = peer, '#' = localclock.

 / .- Source state '*' = current synced,'+' = combined , '-' = not combined,

| /   '?' = unreachable, 'x' = time maybe 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 PollReach LastRx Last sample

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

^* 172.25.0.11                  10   6  377    41   +170us[ +201us] +/-  191us

####5.timedatectl指令####

timedatectl     status          ##顯示目前時間資訊

            set-time        ##設定目前時間

            set-timezone        ##設定目前時區

            set-local-rtc 0|1   ##設定是否使用utc時間