amazon ec2 - Ansible conditional with pattern match using variables -


i using ansible roles provision aws ec2 instances, have created series of task in ec2 roles gets execute each server.

- name: provisioning ec2 instance   ec2:    region: "{{ region }}"    key_name: "{{ key }}"    instance_type: "{{ instance_type }}"    image: "{{ ami }}"    wait: yes    assign_public_ip: yes    group_id: "{{ sgs }}"    vpc_subnet_id: "{{ publicsubnet }}"    source_dest_check: false    instance_tags: '{ "name": "{{ server_name }}", "environment": "{{ tag_env }}" }'  register: instance_info  - name: storing instance information in {{ server_name }}_info file   shell: echo "{{ host_name }}:" " {{ item.public_ip }}"> group_vars/"{{ server_name }}"_info   with_items: instance_info.instances   when: 'nat in {{ server_name }}'  <<=== here  - name: add server inventory   add_host: hostname={{ item.public_ip }} groupname={{ host_name }}   with_items: instance_info.instances   when: "'nat' not in {{ server_name }}"  - name: waiting server come   wait_for:     host: "{{ item.public_ip }}"     port: 22     delay: 5     timeout: 300   with_items: instance_info.instances

so want check if server has prefix nat last 3 task should skipped doesn't make sense execute them. cannot direct comparison other postfix data added {{ server_name }} depending upon environment, time , other details. can provide me information of how can achieve this. thank you

this should work. basically, set flag, no need use jinja in when. i'm using set_fact twice in reality you'd create is_nat=false var elsewhere.

- set_fact: is_nat=false - set_fact: is_nat=true   when: "'nat' in server_name"  - name: add server inventory   add_host: hostname={{ item.public_ip }} groupname={{ host_name }}   with_items: instance_info.instances   when: not is_nat

here's example of in playbook, , execution runs various server_names.

$ cat compare.yml  --- - hosts: localhost   connection: local   vars:     is_nat: false   tasks:     - set_fact: is_nat=true       when: "'nat' in server_name"      - debug: msg="run when not nat"       when: not is_nat

.

$ ansible-playbook -i "localhost," compare.yml -e "server_name=gnat"  play [localhost] **************************************************************   gathering facts ***************************************************************  ok: [localhost]  task: [set_fact is_nat=true] **************************************************  ok: [localhost]  task: [debug msg="run when not nat"] *************************************  skipping: [localhost]  play recap ********************************************************************  localhost                  : ok=2    changed=0    unreachable=0    failed=0

.

$ ansible-playbook -i "localhost," compare.yml -e "server_name=mosquito"  play [localhost] **************************************************************   gathering facts ***************************************************************  ok: [localhost]  task: [set_fact is_nat=true] **************************************************  skipping: [localhost]  task: [debug msg="run when not nat"] *************************************  ok: [localhost] => {     "msg": "run when not nat" }  play recap ********************************************************************  localhost                  : ok=2    changed=0    unreachable=0    failed=0

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