Two tier Design Part 5 Health Check Status

Updated Dec 11, 2020 ·

Overview

This lab adds a validation playbook that checks whether the Apache service is running after the two-tier deployment.

Diagram:

As a final check, we'll just create a simple playbook that checks the status of Apache

# setup-check-status.yml
---

- name: Check status
  hosts: webservers:loadbalancers
  become: True
  tasks:
    - name: Check status of Apache
      command: service httpd status

To test,

ansible-playbook playbooks/setup-check-status.yml

Notice the purple text, where Ansible is suggesting to use the service module instead. If this is used, it will start-up httpd if it detects that it's not running.

Let's try to stop the httpd service on the loadbalancer,

$ ansible -m service -a "name=httpd state=stopped" --become loadbalancers

lb1 | CHANGED => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/libexec/platform-python"
    },
    "changed": true,
    "name": "httpd",
    "state": "stopped",
    "status": {

If we re-run the healthcheck status playbook, we see that it now returns an fatal message in red.

Now let's start apache,

$ ansible -m service -a "name=httpd state=started" --become loadbalancers

Running the healthcheck status playbook again,

Overview​

Overview