SES time sync error

skmvasu asked:

My SES setup was running fine for the last 6 months without any issues. All of a sudden it stopped working yesterday and I’m gettinng the infamous time sync error.

Naturally I assumed ntpd had stopped, but to my surprise when I checked the process tree, I noticed that it was running.

 ~  ps auwx | grep ntpd                                 
ntp      18223  0.0  0.0  33600  2132 ?        Ss   07:05   0:00 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 106:112
ubuntu   19127  0.0  0.0   8144   668 pts/5    S+   07:19   0:00 grep ntpd

Then I tried ntpdate which said

2 Sep 07:16:09 ntpdate[18966]: no servers can be used, exiting

I checked the /etc/ntp.conf file which had the default ubuntu servers listed by default.

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift


# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

# Specify one or more NTP servers.

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
server 0.ubuntu.pool.ntp.org
server 1.ubuntu.pool.ntp.org
server 2.ubuntu.pool.ntp.org
server 3.ubuntu.pool.ntp.org

# Use Ubuntu's ntp server as a fallback.
server ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient

I couldn’t spot the issue here. Then I tried to check the status of NTP server and found no issues there.

/etc/init.d/ntp status                             
 * NTP server is running

I also tried adding a NTP server manually to see if it worked, but that didn’t help either

 sudo ntpdate ntp.ubuntu.com                         
 2 Sep 07:20:08 ntpdate[19203]: the NTP socket is in use, exiting

I really don’t understand what the issue is here. Why is ntpd not working when it’s running in the background?

Any help would be appreciated. Thanks.

My answer:


You need to stop ntpd before running ntpdate.

sudo service ntp stop
sudo ntpdate 0.ubuntu.pool.ntp.org
sudo service ntp start

View the full question and answer on Server Fault.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.