Ansible : Use Playbook (variables)

	This is the usage of variables in Ansible Playbook.
[1]	This is the example to use variables.

[cent@dlp ~]$  vi playbook_sample.yml - hosts: target_servers become: yes become_method: sudo tasks: - name: General packages are installed yum: name: "{{ packages }}" state: present vars: packages: - tar - wget - unzip tags: General_Packages [cent@dlp ~]$  ansible-playbook playbook_sample.yml --ask-become-pass BECOME password: PLAY [target_servers] ********************************************************** TASK [Gathering Facts] ********************************************************* ok: [10.0.0.52] ok: [10.0.0.51] TASK [General packages are installed] ****************************************** ok: [10.0.0.51] ok: [10.0.0.52] PLAY RECAP ********************************************************************* 10.0.0.51 : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0 10.0.0.52 : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0 # verify [cent@dlp ~]$  ansible target_servers -m shell -a "which tar; which wget; which unzip;" 10.0.0.52 | CHANGED | rc=0 >> /usr/bin/tar /usr/bin/wget /usr/bin/unzip 10.0.0.51 | CHANGED | rc=0 >> /usr/bin/tar /usr/bin/wget /usr/bin/unzip

[2]

When running Playbook, [GATHERING FACTS] task is always executed, it is the function which Ansible gets informations of target hosts and set them in variables. You can refer and use them in Playbooks. If you'd like to confirm which kinds of variables set, it's possible to output with [setup] module like follows.

[cent@dlp ~]$  ansible 10.0.0.50 -m setup 10.0.0.50 | SUCCESS => { "ansible_facts": { "ansible_all_ipv4_addresses": [ "10.0.0.50" ], "ansible_all_ipv6_addresses": [ "fe80::5054:ff:fef6:f1b2" ], "ansible_apparmor": { "status": "disabled" }, "ansible_architecture": "x86_64", "ansible_bios_date": "04/01/2014", "ansible_bios_vendor": "SeaBIOS", ..... ..... # example of using variables from [GATHERING FACTS] [cent@dlp ~]$  vi playbook_sample.yml # refer to [ansible_distribution], [ansible_distribution_version] - hosts: target_servers tasks: - name: Refer to Gathering Facts command: echo "{{ ansible_distribution }} {{ ansible_distribution_version }}" register: dist - debug: msg="{{ dist.stdout }}" [cent@dlp ~]$  ansible-playbook playbook_sample.yml PLAY [target_servers] ********************************************************** TASK [Gathering Facts] ********************************************************* ok: [10.0.0.52] ok: [10.0.0.51] TASK [Refer to Gathering Facts] ************************************************ changed: [10.0.0.52] changed: [10.0.0.51] TASK [debug] ******************************************************************* ok: [10.0.0.51] => { "msg": "CentOS 9" } ok: [10.0.0.52] => { "msg": "CentOS 9" } PLAY RECAP ********************************************************************* 10.0.0.51 : ok=3 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0 10.0.0.52 : ok=3 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0