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The cause of this problem is that the time of each node in the cluster must be in sync with the Leader node. This can easily be checked with the "date" command at the Linux command prompt. Machine times can slowly diverge over time if they are not in sync with a NTP server.
Work with your IT team to configure the NTP service to keep machines in sync with an NTP server. Example procedure below:
1. Install the NTP package:
sudo yum install ntp
2. Edit the NTP configuration file:
sudo vi /etc/ntp.conf
Add the NTP servers to the configuration file:
# Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 0.pool.ntp.org server 1.pool.ntp.org server 2.pool.ntp.org
3. Start the NTP Service:
sudo service ntpd start
4. Configure the NTP service to auto start on system boot:
sudo chkconfig ntpd on
5. Repeat steps 1-4 on all machines the Promote Cluster.
After completing the above steps, the "date" command should return consistent results on all machines, and the System Overview panel should then display all machines the Promote Cluster.