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Configure time synchronization¶
Configure all containers in an MKE cluster to regularly synchronize with a Network Time Protocol (NTP) server, to ensure consistency between all containers in the cluster and to circumvent unexpected behavior that can lead to poor performance.
Install NTP on every machine in your cluster:
sudo apt-get update && sudo apt-get install ntp ntpdate
sudo yum install ntp ntpdate sudo systemctl start ntpd sudo systemctl enable ntpd sudo systemctl status ntpd sudo ntpdate -u -s 0.centos.pool.ntp.org sudo systemctl restart ntpd
sudo zypper ref && zypper install ntp
In addition to installing NTP, the command sequence starts ntpd, a daemon that periodically syncs the machine clock to a central server.
Sync the machine clocks:
sudo ntpdate pool.ntp.org
Verify that the time of each machine is in sync with the NTP servers:
sudo ntpq -p
Example output, which illustrates how much the machine clock is out of sync with the NTP servers:
remote refid st t when poll reach delay offset jitter ============================================================================== 45.35.50.61 139.78.97.128 2 u 24 64 1 60.391 4623378 0.004 time-a.timefreq .ACTS. 1 u 23 64 1 51.849 4623377 0.004 helium.constant 128.59.0.245 2 u 22 64 1 71.946 4623379 0.004 tock.usshc.com .GPS. 1 u 21 64 1 59.576 4623379 0.004 golem.canonical 17.253.34.253 2 u 20 64 1 145.356 4623378 0.004