在公司内部搭建 NTP Server (时间同步)服务器

1.服务端

1.服务端	
root@ubuntu1804:~# apt -y install chrony
root@ubuntu1804:~# vim /etc/chrony.conf
    server ntp.aliyun.com iburst
    server time1.cloud.tencent.com iburst
    server slb.time.edu.cn iburst
    allow 10.0.0.0/16            #允许谁和我同步
    local stratum 10             #允许本机作为本地源
    :wq
root@ubuntu1804:~# systemctl restart chrony
root@ubuntu1804:~# systemctl restart chronyd
root@ubuntu1804:~# ss -ntul
    Netid       State          Recv-Q         Send-Q                  Local Address:Port                 Peer Address:Port        
    udp         UNCONN         0              0                       127.0.0.53%lo:53                        0.0.0.0:*           
    udp         UNCONN         0              0                           127.0.0.1:323                       0.0.0.0:*           
    udp         UNCONN         0              0                               [::1]:323                          [::]:*           
    tcp         LISTEN         0              128                     127.0.0.53%lo:53                        0.0.0.0:*           
    tcp         LISTEN         0              128                           0.0.0.0:22                        0.0.0.0:*           
    tcp         LISTEN         0              128                         127.0.0.1:6010                      0.0.0.0:*           
    tcp         LISTEN         0              128                              [::]:22                           [::]:*           
    tcp         LISTEN         0              128                             [::1]:6010                         [::]:*
#查看时间同步 * 星号表示和这台服务器已经同步
root@ubuntu1804:~# chronyc sources -nv
    210 Number of sources = 3
    MS Name/IP address         Stratum Poll Reach LastRx Last sample               
    ===============================================================================
    ^* 203.107.6.88                  2   6    17    57   -407us[-8953us] +/-   39ms	
    ^- 139.199.215.251               2   6    17    57    +12ms[  +12ms] +/-   46ms
    ^? sv9865.si-servers.com         0   7     0     -     +0ns[   +0ns] +/-    0ns

2.客户端

2.客户端   
[root@centos7 ~]# yum -y install chrony
[root@centos7 ~]# vim /etc/chrony.conf
    server 10.0.0.100 iburst
    :wq
[root@centos7 ~]# systemctl restart chronyd
[root@centos7 ~]# chronyc sources -nv
    210 Number of sources = 1
    MS Name/IP address         Stratum Poll Reach LastRx Last sample               
    ===============================================================================
    ^* 10.0.0.100                    3   6     7     0    +23us[ -8784h] +/-   36ms
    
root@ubuntu1804:~# ss -ntul
    Netid       State          Recv-Q         Send-Q                  Local Address:Port                 Peer Address:Port        
    udp         UNCONN         0              0                       127.0.0.53%lo:53                        0.0.0.0:*           
    udp         UNCONN         0              0                             0.0.0.0:123                       0.0.0.0:*           
    udp         UNCONN         0              0                           127.0.0.1:323                       0.0.0.0:*           
    udp         UNCONN         0              0                               [::1]:323                          [::]:*           
    tcp         LISTEN         0              128                     127.0.0.53%lo:53                        0.0.0.0:*           
    tcp         LISTEN         0              128                           0.0.0.0:22                        0.0.0.0:*           
    tcp         LISTEN         0              128                         127.0.0.1:6010                      0.0.0.0:*           
    tcp         LISTEN         0              128                              [::]:22                           [::]:*           
    tcp         LISTEN         0              128                             [::1]:6010                         [::]:*