1. follow the instruction at https://www.digitalocean.com/community/tutorials/introduction-to-ganglia-on-ubuntu-14-04 to finish the installation.
2. install gexec in each client
3. change /etc/ganglia/gmond.conf
change gexec= yes
4. reboot by sudo service ganglia-monitor restart
it is noted that the server has to do this in the last so that all the clients can be found
one incident: macondo03 is down. after it is rebooted, gstat can not see other machines. the only way to make everything back to normal is to run "sudo service ganglia-monitor restart" on every client so that the host can find all the machines.
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