Task Order & Top-Down Execution
Understand sequential task running.
Task Order & Top-Down Execution is a free Ansible Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Ansible Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Tasks Run in Order
Within a play, Ansible runs tasks strictly top to bottom. The order you write them is the order they happen. ⬇️
Sequence Matters
You must install a package before you start its service. Correct order turns a list of tasks into a working setup.
tasks:
- name: Install nginx
ansible.builtin.package:
name: nginx
- name: Start nginx
ansible.builtin.service:
name: nginx
state: startedOne Task Across All Hosts
By default Ansible runs the current task on every host before moving to the next task. This is the linear strategy.
The Linear Lockstep
Picture a grid: task by task, all hosts advance together. No host races ahead, which keeps a rollout predictable.
Failure Stops a Host
If a task fails on a host, Ansible stops running later tasks on that host. Other healthy hosts keep going.
Plays Are Ordered Too
Just like tasks, plays run in file order. Top-down execution applies at both the play and the task level.
No Hidden Reordering
Ansible never rearranges your tasks to optimize. What you write is what runs, which makes playbooks easy to reason about.
Pre and Post Tasks
Beyond plain tasks, a play can have pre_tasks and post_tasks that always run before and after the main block.
- hosts: web
pre_tasks:
- name: Notify start
ansible.builtin.debug:
msg: startingHandlers Run at the End
One exception to top-down: notified handlers are deferred and run once, after all tasks in the play finish.
Design With Order in Mind
Place dependencies first: create a user, then its home, then its files. Thinking about order prevents subtle failures.
Predictable by Default
This simple, sequential model is a feature. Predictable execution is what makes Ansible safe to run again and again. 🔁
Quick Check
Let us nail down how Ansible orders work.
Recap
Tasks and plays run top-down, one task across all hosts at a time. Handlers wait for the end. Order is yours to control. ✅
Frequently asked questions
Is the “Task Order & Top-Down Execution” lesson free?
Yes — the full text of “Task Order & Top-Down Execution” is free to read here on the web, and the Ansible Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Ansible Academy course, upgrade to CoddyKit PRO.
What will I learn in “Task Order & Top-Down Execution”?
Understand sequential task running. You practise Ansible Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Ansible Academy?
No prior experience is required. Ansible Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Task Order & Top-Down Execution” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Ansible Academy lesson?
Yes. Every Ansible Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- A Play = Hosts + Tasks
- Naming Tasks for Readable Output
- Multiple Plays in One Playbook
- Task Order & Top-Down Execution