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127 lines
4.2 KiB
ReStructuredText
127 lines
4.2 KiB
ReStructuredText
.. _module_defaults:
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Module defaults
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===============
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If you frequently call the same module with the same arguments, it can be useful to define default arguments for that particular module using the ``module_defaults`` attribute.
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Here is a basic example::
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- hosts: localhost
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module_defaults:
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file:
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owner: root
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group: root
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mode: 0755
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tasks:
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- file:
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state: touch
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path: /tmp/file1
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- file:
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state: touch
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path: /tmp/file2
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- file:
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state: touch
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path: /tmp/file3
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The ``module_defaults`` attribute can be used at the play, block, and task level. Any module arguments explicitly specified in a task will override any established default for that module argument::
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- block:
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- debug:
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msg: "a different message"
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module_defaults:
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debug:
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msg: "a default message"
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You can remove any previously established defaults for a module by specifying an empty dict::
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- file:
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state: touch
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path: /tmp/file1
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module_defaults:
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file: {}
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.. note::
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Any module defaults set at the play level (and block/task level when using ``include_role`` or ``import_role``) will apply to any roles used, which may cause unexpected behavior in the role.
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Here are some more realistic use cases for this feature.
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Interacting with an API that requires auth::
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- hosts: localhost
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module_defaults:
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uri:
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force_basic_auth: true
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user: some_user
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password: some_password
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tasks:
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- uri:
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url: http://some.api.host/v1/whatever1
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- uri:
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url: http://some.api.host/v1/whatever2
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- uri:
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url: http://some.api.host/v1/whatever3
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Setting a default AWS region for specific EC2-related modules::
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- hosts: localhost
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vars:
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my_region: us-west-2
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module_defaults:
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ec2:
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region: '{{ my_region }}'
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ec2_instance_info:
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region: '{{ my_region }}'
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ec2_vpc_net_info:
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region: '{{ my_region }}'
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.. _module_defaults_groups:
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Module defaults groups
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----------------------
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.. versionadded:: 2.7
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Ansible 2.7 adds a preview-status feature to group together modules that share common sets of parameters. This makes it easier to author playbooks making heavy use of API-based modules such as cloud modules.
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+---------+---------------------------+-----------------+
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| Group | Purpose | Ansible Version |
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+=========+===========================+=================+
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| aws | Amazon Web Services | 2.7 |
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+---------+---------------------------+-----------------+
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| azure | Azure | 2.7 |
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+---------+---------------------------+-----------------+
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| gcp | Google Cloud Platform | 2.7 |
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+---------+---------------------------+-----------------+
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| k8s | Kubernetes | 2.8 |
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+---------+---------------------------+-----------------+
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| os | OpenStack | 2.8 |
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+---------+---------------------------+-----------------+
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| acme | ACME | 2.10 |
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+---------+---------------------------+-----------------+
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| docker* | Docker | 2.10 |
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+---------+---------------------------+-----------------+
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| ovirt | oVirt | 2.10 |
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+---------+---------------------------+-----------------+
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| vmware | VMware | 2.10 |
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+---------+---------------------------+-----------------+
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* The `docker_stack <docker_stack_module>`_ module is not included in the ``docker`` defaults group.
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Use the groups with ``module_defaults`` by prefixing the group name with ``group/`` - for example ``group/aws``.
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In a playbook, you can set module defaults for whole groups of modules, such as setting a common AWS region.
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.. code-block:: YAML
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# example_play.yml
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- hosts: localhost
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module_defaults:
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group/aws:
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region: us-west-2
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tasks:
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- aws_s3_bucket_info:
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# now the region is shared between both info modules
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- ec2_ami_info:
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filters:
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name: 'RHEL*7.5*'
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