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Define an Ansible task as a YAML list item under a play’s tasks: key. Give it a descriptive name, call one module (preferably with its fully qualified collection name), and provide that module’s arguments as YAML. Tasks run in file order for the hosts matched by the play; options such as when, loop, register, and notify control when they run, what they repeat, what they return, and what follow-up work they trigger.
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The basic shape of a task
An Ansible playbook is a YAML document containing one or more plays. A play maps a group of managed hosts to an ordered set of tasks. The task is the list item beginning with - name:; the module key beneath it identifies the operation, and the indented mapping below the module supplies its arguments.
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- name: Configure web servers
hosts: web
tasks:
- name: Ensure the application directory exists
ansible.builtin.file:
path: /opt/myapp
state: directory
mode: '0755'In this example, Ensure the application directory exists is the task name. ansible.builtin.file is the module, and path, state, and mode are module arguments. The play targets hosts in the web inventory group.
What belongs under tasks:
- Each task is a YAML list item, introduced with a dash.
- Each task normally invokes one module.
- Arguments are indented below the module name as key-value pairs.
- Task controls such as
when,loop,register, andnotifysit at the same indentation level as the module key.
Tasks execute from top to bottom by default. Ansible normally applies a task to all hosts matched by the current play before moving to the next task. If a host fails a task, Ansible removes that host from the remaining portion of the play by default; other hosts continue unless you change the play’s failure behavior.
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Name tasks so the run explains itself
The name is displayed in Ansible output and is the quickest way to understand what a run attempted. Use a specific action and object rather than a vague label such as “Do setup.” A useful name states the intended result: “Install required packages,” “Render application configuration,” or “Ensure the application directory exists.”
Names do not change execution, but they make failures, dry runs, and task listings actionable. If a task loops, keep the name stable and let Ansible show the item result, or include enough context in the name to distinguish similar operations.
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Every task calls an Ansible module. Select a purpose-built, preferably idempotent module whose parameters describe the desired state. Common choices include:
| Need | Typical module | What you declare |
|---|---|---|
| Create or modify files and directories | ansible.builtin.file |
Path, state, ownership, permissions, and related attributes |
| Copy a file from the controller | ansible.builtin.copy |
Source, destination, and file mode |
| Render a Jinja2 template | ansible.builtin.template |
Template source, destination, and mode |
| Install or remove packages | ansible.builtin.package |
Package name and desired state |
| Control a service | ansible.builtin.service |
Service name and state |
| Print a value while troubleshooting | ansible.builtin.debug |
A message or selected variable |
Prefer these modules to an opaque shell or command invocation when a module provides the required operation. A purpose-built module communicates intent, can compare the current state with the requested state, and generally supports idempotent reruns. Use a command only when no suitable module expresses the operation, and document why the command is needed.
Use fully qualified collection names
Write module names such as ansible.builtin.copy and ansible.builtin.package instead of relying on short names. Fully qualified collection names (FQCNs) make the selected module unambiguous and are recommended by the official guidance for Ansible 2.10 and later. They also make a playbook easier to read when collections contain modules with similar short names.
Pass module arguments as YAML
Place parameters below the module key and indent them consistently. Quote values when YAML might interpret them unexpectedly. File modes are a common example: write mode: '0755' rather than relying on an unquoted value being treated as the intended string.
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- name: Create the application directory
ansible.builtin.file:
path: /opt/myapp
state: directory
mode: '0755'Keep one conceptual operation per task. If a task needs several independent changes, split them so each result can be reported, retried, or guarded separately. The module documentation for your installed Ansible version remains the authority for valid parameters and accepted values.
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Use variables and Jinja2 expressions for differences
Variables let the same task work across hosts or environments. They can be defined in a playbook, inventory, reusable task files, roles, or on the command line. Reference a variable in a module argument with a Jinja2 expression such as {{ config_path }}.
- name: Render application configuration
ansible.builtin.template:
src: app.conf.j2
dest: '{{ config_path }}'
mode: '0644'Keep the expression inside the value that needs substitution. A variable can represent a scalar, a list, or a mapping, depending on the module’s expected input. Give variables names that reveal their purpose and use a consistent data shape so later loops and conditions remain readable.
Templating is not task generation
Jinja2 expressions can substitute values in task arguments, and Jinja2 templates can contain their own loops and conditionals. They do not generate a dynamic sequence of playbook tasks. The playbook itself must remain machine-parseable YAML. For repetition at task level, use loop; for reusable task groups, use task-file imports or includes.
Repeat work with loop
A loop applies one task to each item in a list. Put the loop beside the module, not inside its argument mapping, and reference the current item with {{ item }}.
- name: Install required packages
ansible.builtin.package:
name: '{{ item }}'
state: present
loop:
- curl
- jqThe loop data can come from a variable:
vars:
packages:
- curl
- jq
tasks:
- name: Install required packages
ansible.builtin.package:
name: '{{ item }}'
state: present
loop: '{{ packages }}'Use a deliberately named loop variable when nested or complex data would make item ambiguous. Give every element the same structure if the module arguments expect fields such as a package name and version. A single loop is concise and keeps the operation consistent; separate explicit tasks are clearer when each item needs materially different arguments or error handling.
Control execution with when
Add when when a task should run only if a condition is true. The value is a raw Jinja2 expression, so do not wrap the expression in {{ }}.
- name: Report configuration path on Red Hat systems
ansible.builtin.debug:
msg: 'Configuration is at {{ config_path }}'
when: ansible_facts['os_family'] == 'RedHat'Use brackets when indexing fact dictionaries, and compare against the value you actually intend. A task without when runs for every host in the play. A skipped task is reported as skipped rather than changed or failed.
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Conditions combined with loops
When when and loop are on the same task, Ansible evaluates the condition separately for each item. This lets one task process only the entries that meet a requirement, but make the condition and item shape obvious to the reader. If each item needs a substantially different decision tree, separate tasks or an included task file may be easier to maintain.
Capture results with register
register stores a task’s return data in a variable for later tasks, loops, or conditionals. Registered data can include status fields and, for a loop, per-item results. Name the variable after the operation rather than using a generic name.
- name: Install required packages
ansible.builtin.package:
name: '{{ item }}'
state: present
loop: '{{ packages }}'
register: package_results
- name: Show package operation results
ansible.builtin.debug:
var: package_resultsRegistering a result does not itself change whether a task is considered changed or failed. Use the module’s normal return status in later logic, and inspect the registered structure when writing conditions for a loop. Keep sensitive values out of debug output unless you have deliberately protected them.
Trigger follow-up work with handlers
Use a handler when a follow-up action should happen only after a notifying task reports changed. A configuration-rendering task can notify a service restart, avoiding an unnecessary restart when the file is already correct.
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ansible.builtin.template:
src: app.conf.j2
dest: '{{ config_path }}'
mode: '0644'
notify: Restart application
handlers:
- name: Restart application
ansible.builtin.service:
name: myapp
state: restartedThe handler name in notify must match the handler’s name. A handler is a special form of task that runs when notified by a previous task with a changed result; it is not an unconditional next step. This makes ordinary task sequencing suitable for required immediate steps, while handlers suit deferred actions such as restarting a service after all relevant configuration changes.
Understand task ordering and host behavior
Within a play, Ansible moves through tasks in order. For each task, it normally addresses all hosts still active in that play before proceeding to the next task. This matters when a later task assumes that an earlier task completed successfully.
- A task can report ok, changed, skipped, or failed.
- A host that fails is removed from the remaining play by default.
- Handlers run only when notified by a changed task.
- A loop produces a result for each item while retaining the task’s overall reporting context.
Design tasks so a rerun is safe: declare the desired state instead of issuing a command that blindly repeats an action. When order is significant, put the prerequisite task first and make the dependency visible in names and variables.
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Reuse task definitions with imports and includes
For a growing playbook, move related tasks into separate files. Static import_tasks brings the file into the playbook during parsing, while dynamic include_tasks loads it during execution. The distinction affects when Ansible can see the tasks and how conditions and loops applied to the reuse statement are evaluated.
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|---|---|---|---|
import_tasks |
Static, during parsing | The task file is a fixed part of the play and should be visible to listing and parse-time checks | Less suitable when the file itself must be selected dynamically at runtime |
include_tasks |
Dynamic, during execution | The file depends on a variable, condition, or runtime decision | Some tasks are not known until the include is reached |
Use a role when you need a larger reusable unit with conventional directories for tasks, handlers, templates, files, defaults, and variables. Keep each task file focused so its inputs and side effects are clear.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Complete example combining task controls
The following play shows variables, a loop, a registered result, a template task, a conditional task, and a handler in one valid structure.
- name: Deploy application configuration
hosts: app
vars:
config_path: /etc/myapp/app.conf
packages:
- curl
- jq
tasks:
- name: Install required packages
ansible.builtin.package:
name: '{{ item }}'
state: present
loop: '{{ packages }}'
register: package_results
- name: Render application configuration
ansible.builtin.template:
src: app.conf.j2
dest: '{{ config_path }}'
mode: '0644'
notify: Restart application
- name: Report configuration path on Red Hat systems
ansible.builtin.debug:
msg: 'Configuration is at {{ config_path }}'
when: ansible_facts['os_family'] == 'RedHat'
handlers:
- name: Restart application
ansible.builtin.service:
name: myapp
state: restartedThe package task runs once per list item and stores its aggregate result. The template task can notify the handler if rendering changes the destination file. The debug task runs only on hosts whose gathered operating-system family fact equals RedHat. Each task has one primary purpose, and the controls sit at the task level where Ansible expects them.
Validate a playbook before changing hosts
Validation should be a normal part of defining tasks, especially after changing indentation, variables, conditions, or includes. Run these commands from the system where Ansible is installed:
ansible-playbook --syntax-check site.ymlparses the playbook and reports YAML or playbook-structure errors without running the tasks.ansible-playbook --list-hosts site.ymlshows which hosts the play targets. Use it to catch an inventory pattern that matches too many or too few hosts.ansible-playbook --list-tasks site.ymllists the tasks Ansible can identify for the playbook. Static imports are visible at parse time; dynamically included tasks may not appear until execution reaches the include.ansible-playbook --check site.ymlrequests a dry-run of supported changes. The exact result depends on the module and the installed Ansible version; modules that do not fully support check mode cannot provide a complete preview.ansible-playbook --check --diff site.ymlcombines check mode with diffs where the module supports them, which is useful for reviewing file and template changes before applying them.
These options answer different questions: “Can Ansible parse this?”, “Which hosts are selected?”, “Which tasks are selected?”, and “What might change?” Run a syntax check first, then inspect hosts and tasks, and finally use check and diff modes when the modules involved support meaningful previews.
Troubleshoot the failures task authors see most
YAML indentation or typing errors
YAML structure is defined by indentation. A module’s arguments must be nested beneath the module key, while when, loop, and register align with that key. Quote values such as file modes when implicit YAML typing could alter their meaning. A syntax check catches parse errors before a host is contacted.
Wrong module or ambiguous short name
If a short module name resolves unexpectedly or a collection is missing, replace it with the intended FQCN, such as ansible.builtin.file. Confirm that the collection and module version installed on the control node support the parameters you are using.
Condition never runs
Check that when contains a raw expression, not a quoted Jinja2 interpolation. For example, use when: ansible_facts['os_family'] == 'RedHat', not when: '{{ ansible_facts["os_family"] == "RedHat" }}'. Verify the fact or variable exists on the host and has the value you compare.
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Inspect the variable supplied to loop and ensure every item exposes the fields referenced by the module arguments. Register the result and use ansible.builtin.debug to inspect it when a loop behaves differently from a single-item test.
Expected restart did not occur
Handlers run only after a notifying task reports changed. If the rendered file is identical, no notification is generated, which is the intended idempotent behavior. Check that the notification text exactly matches the handler name and that the task actually changed the managed resource.
Check mode differs from a real run
Check and diff modes are previews, not guarantees. Module support varies, and a preview may lack information that is available only during a real change. Treat the result as a safety aid, then verify the module’s documented check-mode behavior for your installed version.
Task-pattern decisions at a glance
| Decision | Prefer this | Why | Use the alternative when |
|---|---|---|---|
| Module or shell/command | Purpose-built module | States the desired result and usually supports idempotent behavior | No module expresses the required operation |
| One loop or many explicit tasks | One loop for uniform items | Less repetition and consistent arguments | Items need different parameters, names, or recovery paths |
| Unconditional or conditional task | when for host- or item-specific work |
Prevents irrelevant changes and documents the gate | The operation is required for every matched host |
| Immediate next task or handler | Handler for deferred reactions to change | Runs only when a notifying task changed something | The next action must happen every time or immediately |
| Static import or dynamic include | import_tasks for fixed structure |
Tasks are known during parsing and listing | include_tasks is needed for runtime selection |
A practical checklist for defining each task
- Is the task under the correct play’s
tasks:list and indented as a YAML list item? - Does its
namedescribe the intended result clearly? - Is there a purpose-built module, written with an FQCN, instead of an opaque command?
- Are module arguments correctly indented and values quoted where YAML typing could surprise you?
- Should environment-specific values be variables rather than literals?
- Would a
loopremove repeated, identical task definitions? - Should a
whenexpression limit execution for a host or loop item? - Do later tasks need the return data through
register? - Should a configuration change notify a handler rather than restart a service unconditionally?
- Have you run syntax, host, task-list, check, or diff validation appropriate to the change?
A task is well defined when its name reveals the action, its module expresses the desired state, its arguments are unambiguous YAML, and its controls make execution conditions explicit. Building playbooks this way keeps runs ordered and inspectable while making reruns safer and failures easier to diagnose.
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