Check global variable, and if match do somethingMatch a domain nameThe playbook first collects the contents of the "ansible_domain" variable, and the debug command prints out the domain. Then it checks to see if that ---# collect some data from the host, depending on the data collected, do something. - hosts: localhost gather_facts: yes tasks: - name: printing Variable debug: var: ansible_domain - name: check if this is in mb2 debug: msg: ">> this is in MB2 " when: ansible_domain == "mb2.prod.cmed.us" - name: check if this is in fhm debug: msg: ">> this is in FHM " when: ansible_domain == "fhm.prod.cmed.us"...If we run it on one test machine that does not match either of the domains, it skips the "check" task cm@Balsa ~/ansible $ ansible-playbook playbooks/condition-do.ymlPLAY [localhost] ************************************************************************************TASK [Gathering Facts] ******************************************************************************ok: [localhost]TASK [printing Variable] ****************************************************************************ok: [localhost] => { "ansible_domain": "0.0.127.in-addr.arpa"}TASK [check if this is in mb2] **********************************************************************skipping: [localhost]TASK [check if this is in fhm] **********************************************************************skipping: [localhost]PLAY RECAP ******************************************************************************************localhost : ok=2 changed=0 unreachable=0 failed=0 skipped=2 rescued=0 ignored=0cm@Balsa ~/ansible $ If it runs on a host that does match, then it runs the task that matches. In this case, the domain output is "mb2.prod.cmed.us" which is matched in the second task. With that match, the task prints out the message ">> this is in MB2", but you could modify that task so it would run a different module or even a role. [root@boss01 ansible]# ansible-playbook condition-do.ymlPLAY [localhost] ****************************************************************************************************************TASK [Gathering Facts] **********************************************************************************************************ok: [localhost]TASK [printing Variable] ********************************************************************************************************ok: [localhost] => { "ansible_domain": "mb2.prod.cmed.us"}TASK [check if this is in mb2] **************************************************************************************************ok: [localhost] => { "msg": ">> this is in MB2 "}TASK [check if this is in fhm] **************************************************************************************************skipping: [localhost]PLAY RECAP **********************************************************************************************************************localhost : ok=3 changed=0 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0[root@boss01 ansible]#Match a collection of hostsIf many hosts all share a similar prefix, you can grep them all out and do something with them. In this example, we are going to search the hostname, and match on part of the name. If there is a match, then we will do something. ---# only do something to hosts with common names- hosts: all gather_facts: yes tasks: - name: printing Variable debug: var: ansible_hostname - name: check if this is a dga host debug: msg: ">> this is a dga host " when: ansible_hostname is match("dga*")...An example of a match: # ansible-playbook playbooks/condition-hostgroup.yml -i 10.33.128.200, --user root --ask-passSSH password:PLAY [all] ****************************************************************************************************************************************************TASK [Gathering Facts] ****************************************************************************************************************************************ok: [10.33.128.200]TASK [printing Variable] **************************************************************************************************************************************ok: [10.33.128.200] => { "ansible_hostname": "dga02"}TASK [check if this is a dga host] ****************************************************************************************************************************ok: [10.33.128.200] => { "msg": ">> this is a dga host "}PLAY RECAP ****************************************************************************************************************************************************10.33.128.200 : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0[root@boss01 ansible]#An example of a non-match: # ansible-playbook playbooks/condition-hostgroup.yml -i 10.33.128.150, --user root --ask-passSSH password:PLAY [all] ****************************************************************************************************************************************************TASK [Gathering Facts] ****************************************************************************************************************************************ok: [10.33.128.150]TASK [printing Variable] **************************************************************************************************************************************ok: [10.33.128.150] => { "ansible_hostname": "test01"}TASK [check if this is a dga host] ****************************************************************************************************************************skipping: [10.33.128.150]PLAY RECAP ****************************************************************************************************************************************************10.33.128.150 : ok=2 changed=0 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0[root@boss01 ansible]#Reference:
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