Ansible: Set Conditional Handler
I have a playbook which installs and configures NRPE. The packages and services are different on Red Hat versus Debian-based systems, but my site configuration is the same. I burnt a fair amount of time trying to figure out how to allow the configuration tasks to notify a single handler. The result looks something like:
# Debian or Ubuntu
- name: Ensure NRPE is installed on Debian or Ubuntu
when: ansible_pkg_mgr == 'apt'
apt: pkg=nagios-nrpe-server state=latest
- name: Set nrpe_handler to nagios-nrpe-server
when: ansible_pkg_mgr == 'apt'
set_fact: nrpe_handler='nagios-nrpe-server'
# RHEL or CentOS
- name: Ensure NRPE is installed on RHEL or CentOS
when: ansible_pkg_mgr == 'yum'
yum: pkg={{item}} state=latest
with_items:
- nagios-nrpe
- nagios-plugins-nrpe
- name: Set nrpe_handler to nrpe
when: ansible_pkg_mgr == 'yum'
set_fact: nrpe_handler='nrpe'
# Common
- name: Ensure NRPE will talk to Nagios Server
lineinfile: dest=/etc/nagios/nrpe.cfg regexp='^allowed_hosts=' line='allowed_hosts=nagios.domain.com'
notify:
- restart nrpe
### A few other common configuration settings ...
Then, over in the handlers file:
# Common
- name: restart nrpe
service: name={{nrpe_handler}} state=restarted
The trick boiled down to using the set_fact module.
