If you don’t know what is Ganglia > http://ganglia.info/
When I managed HPC I deployed new nodes via « kickstart » (RHEL servers). But when you change of manufacturer of servers, there can be some device name changes ! For example NICs name !! So pay attention to modify in your /etc/ganglia/gmond.conf the two lines where is specify the name of the NIC on which Ganglia is looking (mcast_if)
If you need to install MySQL for what ever, you will have to launch this script :
The first question is to choose a password but since it’s the first installation, you didn’t choose any ! If you installed mariadb you can « bypass » this step by pressing enter but if you installed mysql-server you have to check in the log file created by mysql-server where you can find a temporary password.
Sick of having your logs (/var/log/messages) flooded by useless messages :
Type this command :
echo 'if $programname == "systemd" and ($msg contains "Starting Session" or $msg contains "Started Session" or $msg contains "Created slice" or $msg contains "Starting user-" or $msg contains "Starting User Slice of" or $msg contains "Removed session" or $msg contains "Removed slice User Slice of" or $msg contains "Stopping User Slice of") then stop' >/etc/rsyslog.d/ignore-systemd-session-slice.conf
Then restart your rsyslog (systemctl restart rsyslog)