First time install for Xymon Monitor
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The client needs to know what server(s) to report too. Before 
starting the client, edit /etc/sysconfig/xymon-client and add the 
server IP(s) to:

XYMONSERVERS="<display server IPs>"

If the display server is also installed, the default setting is to 
monitor localhost. Change this to the IP and host name of current 
machine and/or add others by editing /etc/xymon/hosts.cfg (formerly 
bb-hosts). It takes a while for xymon to gather information from the 
clients and it's not displayed on the web interface until xymon has 
what it needs. Some items take longer than others before being 
listed. 

The old SysV scripts for xymon and xymon-client have been replaced 
with a single systemd unit file, 'xymon.service'. The xymon service 
controls both the client and server (if installed). When enabled, 
the xymon service sets up xymon-client alias and either name can be 
used to start/stop the service, which will start/stop both the 
client and server (if installed).