nrpe uses private ip rather than public ip with nagios

[Narinder Gupta]

In K8s deployment on openstack we expose nrpe on openstack VM instances to Nagios on different bare metal model. Issue is Few of the instances uses public IPS and couple of then uses private IPs while registering with Nagios. And nagios marked those instance down in nagios which is not true. As nagios can not reach to nrpe VM instances on private network so nagios status shows critical as instance service can not reach from nagios to openstack VM instances.

nrpe config as below.

  nrpe-host:
    charm: cs:nrpe
    options:
      nagios_hostname_type: host
      nagios_address_type: public
      xfs_errors: "30"
      swap: ''

[Narinder Gupta (narindergupta)]

date from nagios as in same Nagios server with two different ips. As 10.20.176.22 is public IPs and
192.168.100.16 on private network.

# Configuration file /etc/nagios3-inprogress/conf.d/charm.cfg
# Edited by PyNag on Mon Apr 8 15:46:17 2019

define host {
         use generic-host
         statusmap_image base/ubuntu.gd2
         icon_image_alt Ubuntu Linux
         vrml_image ubuntu.png
         host_name bootstack-okcupid-WA-k8s-juju-b95798-kubernetes-4
         icon_image base/ubuntu.png
        address 10.20.176.22
}

# Configuration file /etc/nagios3-inprogress/conf.d/charm.cfg
# Edited by PyNag on Mon Apr 8 15:46:17 2019

define host {
         use generic-host
         statusmap_image base/ubuntu.gd2
         icon_image_alt Ubuntu Linux
         vrml_image ubuntu.png
         host_name bootstack-okcupid-WA-k8s-juju-b95798-kubernetes-2
         icon_image base/ubuntu.png
        address 192.168.100.16
}

[Aurelien Lourot (aurelien-lourot)]

The issue is that here we set `address` to the relation's target-address:
https://git.launchpad.net/nagios-charm/tree/hooks/monitors-relation-changed#n131

Instead we should set it to the relation's ingress-address, see https://jaas.ai/docs/charm-network-primitives