I am new to icinga2. During the last week, I was reading through the documentation to try to understand icinga2. I also did some setup but there are still something that confuses me and I hope very much that you can help me to clarify.
Is it a must to have at least one master and zone setup? Why do I need zone when I can just put my host/services config under /etc/icinga2/conf.d?
On the Linux client that i want to monitor, there is no agent setup, no ssh enabled. However the checks like disk/load for this this client still returns correct state. How was the state returned to the icinga2 server, i mean via which channel? I even did the tcpdump during the service/host check and saw no traffic between them.
I know that it sounds very basic stuff. But I hope one can help me to clarify. I am really confused.
Thanks and Best regards!