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Excellent Education Program
Innovative Methods of Teaching

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Learning Through Play
Devoted to the Early Education

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Slide 2
Learning Through Play
Devoted to the Early Education

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Slide 2
Learning Through Play
Devoted to the Early Education

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Slide 2
Learning Through Play
Devoted to the Early Education

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Learning Through Play
Find a Class for your Children

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How to specifying multiple groups in a playbook hosts specification?

Spread the Knowledge

By design, Ansible executes just one play at a time. Your playbook consists of two plays (the two items in the root-level YAML list defined by the playbook file).

Method 1
The following patterns address one or more groups. Groups separated by a colon indicate an “OR” configuration. This means the host may be in either one group or the other:

---
- name: This sets up an httpd webserver
  hosts: web:db

  tasks:
  - name: Install the httpd apps
    yum: name=httpd
  - name: start the httpd service
    service: name=httpd state=started
  - debug:
      msg: System {{ myname }} has uuid {{ ansible_product_uuid }}
  - debug: msg="System {{ myname }} has uuid {{ ansible_product_uuid }}"


Method 2
You can exclude groups as well, for instance, all machines must be in the group webservers but not in the group phoenix:

---
- name: This sets up an httpd webserver
  hosts: webservers:!phoenix

  tasks:
  - name: Install the httpd apps
    yum: name=httpd
  - name: start the httpd service
    service: name=httpd state=started
  - debug:
      msg: System {{ myname }} has uuid {{ ansible_product_uuid }}
  - debug: msg="System {{ myname }} has uuid {{ ansible_product_uuid }}"

Method 3
You can also specify the intersection of two groups. This would mean the hosts must be in the group webservers and the host must also be in the group staging:

---
- name: This sets up an httpd webserver
  hosts: webservers:&staging
  tasks:
  - name: Install the httpd apps
    yum: name=httpd
  - name: start the httpd service
    service: name=httpd state=started
  - debug:
      msg: System {{ myname }} has uuid {{ ansible_product_uuid }}
  - debug: msg="System {{ myname }} has uuid {{ ansible_product_uuid }}"

Method 4
You can also specify the intersection of two groups. This would mean the hosts must be in the group webservers and the host must also be in the group staging: The below configuration means “all machines in the groups ‘webservers’ and ‘dbservers’ are to be managed if they are in the group ‘staging’ also, but the machines are not to be managed if they are in the group ‘phoenix’ … whew!

---
- name: This sets up an httpd webserver
  hosts: webservers:dbservers:&staging:!phoenix
  tasks:
  - name: Install the httpd apps
    yum: name=httpd
  - name: start the httpd service
    service: name=httpd state=started
  - debug:
      msg: System {{ myname }} has uuid {{ ansible_product_uuid }}
  - debug: msg="System {{ myname }} has uuid {{ ansible_product_uuid }}"

Method 5
You can also use variables if you want to pass some group specifiers via the “-e” argument to ansible-playbook, but this is uncommonly used:

---
- name: This sets up an httpd webserver
  hosts: webservers:!{{excluded}}:&{{required}}
  tasks:
  - name: Install the httpd apps
    yum: name=httpd
  - name: start the httpd service
    service: name=httpd state=started
  - debug:
      msg: System {{ myname }} has uuid {{ ansible_product_uuid }}
  - debug: msg="System {{ myname }} has uuid {{ ansible_product_uuid }}"

Reference
https://docs.ansible.com/ansible/latest/user_guide/intro_patterns.html

Rajesh Kumar