ansible/examples/playbooks/group_by.yml

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---
# Example playbook to demonstrate the group_by action plugin.
#
# as we know, the setup module will automatically run in each play, and sets up various
# facts. We can then create temporary (in memory only) groups based on those facts, which
# are useful ways of selecting similar sets of hosts.
#
# Additionally, we can use the 'register' keyword in Ansible to set similar variables
# and use those for grouping. This is not shown in this example.
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- hosts: all
tasks:
- name: Create a group of all hosts by operating system
action: group_by key=${ansible_distribution}-${ansible_distribution_version}
# the following host group does not exist in inventory and was created by the group_by
# module.
- hosts: CentOS-6.2
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tasks:
- name: ping all CentOS 6.2 hosts
action: ping
- hosts: CentOS-6.3
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tasks:
- name: ping all CentOS 6.3 hosts
action: ping