To keep all the services in sync across multiple machines, you need to install NTP, and if you do a multi-node configuration you will configure one server to be the reference server. $ sudo apt-get install ntp $ sudo yum install ntp $ sudo zypper install ntp Set up the NTP server on your controller node so that it receives data by modifying the ntp.conf file and restarting the service. As root: # sed -i 's/server ntp.ubuntu.com/server ntp.ubuntu.com\nserver 127.127.1.0\nfudge 127.127.1.0 stratum 10/g' /etc/ntp.conf # service ntp restart $ sudo service ntpd start $ sudo chkconfig ntpd on $ sudo systemctl start ntp.service $ sudo systemctl enable ntp.service Set up the NTP client on your compute node so that the time between controller node and compute node is synchronized. The simplest way to do this is to add a daily cron job that synchronizes the compute node's clock with the controller node. You can accomplish this by adding a file, owned by root, marked executable, at /etc/cron.daily/ntpdate that contains the following:ntpdate <hostname or IP address of controller> hwclock -w If a large clock skew builds up between the compute nodes and the controller node, then the time change that occurs when the ntpdate cron job runs may confuse some programs running on the compute nodes. To allow more gradual time updates, install the NTP package on the compute nodes in addition to the API nodes.