Automating Cron Job Setup with Ansible Like a Pro

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Keeping servers clean, logs trimmed, and disk spac
e healthy?

Cron jobs do the grunt work — but managing them manually? Pain.

That’s where Ansible saves the day.

Here's how I automated system maintenance jobs with a reusable Ansible role called cron-master.

Project Structure

ansible-galaxy init roles/cron-master --offline

ansible/
├─ README.md
├─ ansible.cfg
├─ cron-master.yml              # playbook to run cron-master role
├─ hosts.ini                    # inventory file
├─ install_ansible.sh           # bootstrap script
├─ requirements.yml
├─ roles/
│  └─ cron-master/
│     ├─ tasks/                 # main logic broken into files
│     │  ├─ main.yml
│     │  ├─ crons.yml
│     │  ├─ deps.yml
│     │  ├─ clean.yml
│     │  └─ space.yml
│     ├─ templates/             # cron scripts and job list
│     │  ├─ crons.j2
│     │  ├─ clean.sh.j2
│     │  └─ space.sh.j2
│     ├─ defaults/vars/meta/... usual role files

Installing Dependencies

We need basic packages and a specific version of cronitor to monitor jobs.

roles/cron-master/tasks/deps.yml

- name: Ensure dependencies are installed
  apt:
    name:
      - bc
      - curl
    state: present

- name: Check cronitor version
  command: cronitor --version
  register: cronitor_version
  changed_when: false
  failed_when: false

- name: Install specific cronitor version
  when: "'30.3' not in cronitor_version.stdout"
  block:
    - name: Download cronitor 30.3
      get_url:
        url: https://github.com/cronitorio/cronitor-cli/releases/download/30.3/linux_amd64.tar.gz
        dest: /tmp/cronitor.tar.gz

    - name: Extract and move binary
      unarchive:
        src: /tmp/cronitor.tar.gz
        dest: /tmp
        remote_src: yes

    - name: Move cronitor binary
      command: mv /tmp/cronitor /usr/local/bin/cronitor

Defining Cron Jobs

I put my cron jobs in a crons.j2 template, so I can maintain them like code:

roles/cron-master/templates/crons.j2

0 0 * * * sudo truncate -s 0 /var/log/nginx/access.log
0 0 * * * sudo truncate -s 0 /var/log/nginx/nginx_error.log
0 0 * * * rm /var/log/nginx/*.gz

Then loaded it in crons.yml:

- name: Add custom cron jobs to root crontab
  vars:
    lines: "{{ lookup('template', 'crons.j2').splitlines() }}"
  cron:
    name: "{{ (idx > 0 and lines[idx-1].strip().startswith('#')) | ternary(lines[idx-1] | trim | regex_replace('^#\\s*', ''), ' '.join(item.split()[5:])) }}"
    minute: "{{ item.split()[0] }}"
    hour: "{{ item.split()[1] }}"
    day: "{{ item.split()[2] }}"
    month: "{{ item.split()[3] }}"
    weekday: "{{ item.split()[4] }}"
    job: "{{ ' '.join(item.split()[5:]) }}"
    user: root
  loop: "{{ lines }}"
  loop_control:
    index_var: idx
  when: item | trim | length > 0 and not item.strip().startswith('#')

Custom Scripts for Cleaning & Space Checks

I used templates like clean.sh.j2 and space.sh.j2, then scheduled them via clean.yml and space.yml.

Master Task File

main.yml ties it all together:

- name: Install dependencies
  include_tasks: deps.yml

- name: Deploy clean script
  include_tasks: clean.yml

- name: Deploy space check cron
  include_tasks: space.yml

- name: Add custom cron jobs
  include_tasks: crons.yml

Running the Role

Use a playbook like this:

cron-master.yml

- name: Set up cron jobs on servers
  hosts: all
  become: true
  roles:
    - cron-master

Then run it:

ansible-playbook -i hosts.ini cron-master.yml

Why This Rocks

• 🔁 Idempotent cron management
• 📋 All cron jobs version-controlled
• 🔎 Easy to test in isolation with ansible-playbook --tags
• 🔐 Secure and predictable

Bonus Tip: Test with Vagrant or Docker

You can easily test this role in a local VM or container to be safe before pushing to prod.

Any feedback or contributors are welcome!

It’s online, open-source, and ready for anyone to use.

👉 Check it out: ⭐ Star it on GitHub:

Let’s make it even better together.

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