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The make install-init is looking for the following script
rh-upstart-init
in the startup folder.
Does it exist and does the rh-upstart-init.in file exist in that folder?
Can you post the config.log file from the nrpe source folder?
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However, pardon my ignorance, but can you run traditional services now in a docker container? I ask because last I worked with them a few years ago you could not.
Both, /tmp/nrpe-nrpe-3.2.1/startup/rh-upstart-init and /tmp/nrpe-nrpe-3.2.1/startup/rh-upstart-init.in exist.
I tried now starting "make install-init" from startup folder:
There is no "init" file for docker then, the configure script can't detect you are in docker, you would have to skip that part and add the supervisord item
/usr/local/nagios/libexec/check_nrpe -H 10.30.30.33
connect to address 10.30.30.33 port 5666: Connection refused
connect to host 10.30.30.33 port 5666: Connection refused
is not coming form NRPE, it is at a different layer, like something is blocking the port e.g. firewall, or NRPE isn't actually bound to the port which doesn't seem to be the case because of your netstat output