Time is not synced in centos7.3

Question

I have installed stock CentOS7.3, and install chrony

yum install -y chrony
systemctl start chronyd
systemctl enable chronyd

If I start CentOS, the time is not synced:

$ timedatectl
NTP enabled: yes
NTP synchronized: no

chrony is running, though

$ systemctl status chronyd
● chronyd.service - NTP client/server
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2017-06-02 12:19:35 JST; 17min ago
  Process: 631 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exited, status=0/SUCCESS)
  Process: 608 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 620 (chronyd)
   Memory: 1.2M
   CGroup: /system.slice/chronyd.service
           └─620 /usr/sbin/chronyd

I have to do a manually sudo systemctl restart chronyd to fix the time syncing problem.

Why is that.

Solution

NTP takes some time to synchronize. It needs a couple data points, which takes a minute or two.

You can watch the state of peers with commands like chronyc sources. Each server should have a packet received recently, the LastRx column.

timedatectl determines NTP status via the kernel time discipline. It calls adjtimex() and returns false on an error or if STA_UNSYNC. See systemd sources, time-util.c.

Comments

[Sato]

I waited 30mins, still no luck. [root@localhost ~]# chronyc sources 210 Number of sources = 4 MS Name/IP address Stratum Poll Reach LastRx Last sample ============================================================‌​=================== ^+ laika.paina.net 2 6 371 11 -231us[ -231us] +/- 35ms ^- jp.dan.me.uk 2 6 277 11 +11ms[ +11ms] +/- 185ms ^* chobi.paina.net 2 6 377 15 -287us[ -382us] +/- 21ms ^+ sjkBBML24.bb.kddi.ne.jp 5 6 377 12 +794us[ +794us] +/- 59ms