Qfyilyi

I want to create a role to do a dynamic update of my Nagios configuration when I create a new VM.

So to do that, i already created a role which add a host definition at the end of my servers.cfg Nagios file, it looks like :

- name: Add {{ Host_Name }} in /etc/naemon/conf.d/hosts/servers.cfg

  blockinfile:

    dest: /etc/naemon/conf.d/hosts/servers.cfg

    block: |

      define host {

        host_name                      {{ Host_Name }}

        alias                          {{ Host_Name }}.uem.lan

        address                        {{ Host_IP }}

        use                            modele_host,host-pnp

      }

    marker:   ""

    backup: yes

It works well.

So now I would like to be able to add my "{{ Host_Name }}" server directly at the end of lines of checks files.

Exemple : This is a check to monitore /data partition :

define service {

  service_description            /data partition

  host_name                      myserv1,myserv2,myserv3,myserv4,myserv5

  use                            srv-pnp,modele_service_disk_linux_snmp

  check_command                  check_snmp_storage!uem_snmp!/data$!90!95

}

And I would to add my "{{ Host_Name }}" like that :

define service {

  service_description            /data partition

  host_name                      myserv1,myserv2,myserv3,myserv4,myserv5,{{ Host_Name }}

  use                            srv-pnp,modele_service_disk_linux_snmp

  check_command                  check_snmp_storage!uem_snmp!/data$!90!95

}

Would anyone have a solution?

Thx :)

My approach will be different, but it should working with Nagios 3 and 4.

Just edit your first Ansible task a little bit:

- name: Add {{ Host_Name }} in /etc/naemon/conf.d/hosts/servers.cfg

  blockinfile:

    dest: /etc/naemon/conf.d/hosts/servers.cfg

    block: |

      define host {

        host_name                      {{ Host_Name }}

        alias                          {{ Host_Name }}.uem.lan

        address                        {{ Host_IP }}

        hostgroup_name                 anything

        use                            modele_host,host-pnp

      }

    marker:   ""

    backup: yes

Then replace your service definition with this:

define service {

  service_description            /data partition

  hostgroup_name                 anything

  use                            srv-pnp,modele_service_disk_linux_snmp

  check_command                  check_snmp_storage!uem_snmp!/data$!90!95

}

Everytime when you add new host via Ansible to anything hostgroup and restart/reload Nagios service you will monitor your /data partition without addition work.

You can give it a try with the following:

- name: 'LINEINFILE'

  lineinfile:

    path: 'service.cfg'

    line: '{{item.line}}'

    regexp: '{{item.regexp}}'

    backrefs: True

  loop:

    - { line: '12', regexp: '(s*host_name.*),{{inventory_hostname}}(.*)' }

    - { line: '1,{{inventory_hostname}}', regexp: '(s*host_name.*)' }

Pretty ugly, but idempotent.