It is impossible to install noderig if another software already listen on port 9100 due to the default configuration.
It appears that the installation package read the file /etc/default/noderig (https://github.com/ovh/noderig/blob/master/debian/noderig.postinst#L7 and https://github.com/ovh/noderig/blob/master/debian/noderig.postinst#L49).
So, if the file exists it may load the variable START_ON_INSTALL in order to know if it should launch the application.
It is impossible to install noderig if another software already listen on port 9100 due to the default configuration.
It appears that the installation package read the file
/etc/default/noderig(https://github.com/ovh/noderig/blob/master/debian/noderig.postinst#L7 and https://github.com/ovh/noderig/blob/master/debian/noderig.postinst#L49).So, if the file exists it may load the variable
START_ON_INSTALLin order to know if it should launch the application.